README: Update screenshot

This backs out commit 89c991b636.

.gitattributes

@@ -0,0 +1 @@
+*.png filter=lfs diff=lfs merge=lfs -text

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,24 @@
+---
+name: Bug report
+about: Report a bug or a crash
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+<!-- Please describe the issue here at the top, then fill in the system information below. -->
+
+### System Information
+
+<!-- Paste the output of `niri -V`, e.g. niri 0.1.0-beta.1 (v0.1.0-beta.1) -->
+* niri version: 
+
+<!-- Write your distribution, e.g. Fedora 40 Silverblue -->
+* Distro: 
+
+<!-- Write your GPU vendor and model, e.g. AMD RX 6700M -->
+* GPU: 
+
+<!-- Write your CPU vendor and model, e.g. AMD Ryzen 7 6800H -->
+* CPU:

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,4 @@
+contact_links:
+  - name: Feature request
+    url: https://github.com/YaLTeR/niri/discussions/new?category=ideas
+    about: Ideas for new features and functionality (start a Discussion)

.github/dependabot.yml

@@ -0,0 +1,22 @@
+version: 2
+updates:
+  - package-ecosystem: "cargo"
+    directory: "/"
+    schedule:
+      interval: "daily"
+    groups:
+      smithay:
+        patterns:
+          - "smithay"
+          - "smithay-drm-extras"
+      rust-dependencies:
+        update-types:
+          - "minor"
+          - "patch"
+
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"
+    ignore:
+      - dependency-name: "Andrew-Chen-Wang/github-wiki-action"

.github/workflows/ci.yml

@@ -23,7 +23,7 @@ jobs:
             release-flag: '--release'
 
     name: test - ${{ matrix.configuration }}
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
 
     steps:
       - uses: actions/checkout@v4
@@ -32,41 +32,95 @@ jobs:
 
       - name: Install dependencies
         run: |
-          sudo apt-get install -y software-properties-common
-          sudo add-apt-repository -y ppa:pipewire-debian/pipewire-upstream
           sudo apt-get update -y
-          sudo apt-get install -y libudev-dev libgbm-dev libxkbcommon-dev libegl1-mesa-dev libwayland-dev libinput-dev libdbus-1-dev libsystemd-dev libseat-dev libpipewire-0.3-dev
+          sudo apt-get install -y curl gcc clang libudev-dev libgbm-dev libxkbcommon-dev libegl1-mesa-dev libwayland-dev libinput-dev libdbus-1-dev libsystemd-dev libseat-dev libpipewire-0.3-dev libpango1.0-dev libdisplay-info-dev
 
-      - name: Install Rust
-        run: |
-          rustup set auto-self-update check-only
-          rustup toolchain install stable --profile minimal
+      - uses: dtolnay/rust-toolchain@stable
 
       - uses: Swatinem/rust-cache@v2
         with:
           key: ${{ matrix.configuration }}
 
-      - name: Build (no default features)
-        run: cargo build ${{ matrix.release-flag }} --no-default-features
+      - name: Check (no default features)
+        run: cargo check ${{ matrix.release-flag }} --no-default-features
 
-      - name: Build
-        run: cargo build ${{ matrix.release-flag }}
+      - name: Check (just dbus)
+        run: cargo check ${{ matrix.release-flag }} --no-default-features --features dbus
+
+      - name: Check (just systemd)
+        run: cargo check ${{ matrix.release-flag }} --no-default-features --features systemd
+
+      - name: Check (just dinit)
+        run: cargo check ${{ matrix.release-flag }} --no-default-features --features dinit
+
+      - name: Check (just xdp-gnome-screencast)
+        run: cargo check ${{ matrix.release-flag }} --no-default-features --features xdp-gnome-screencast
+
+      - name: Check
+        run: cargo check ${{ matrix.release-flag }}
 
       - name: Build (with profiling)
         run: cargo build ${{ matrix.release-flag }} --features profile-with-tracy
 
-      - name: Build Tests
-        run: cargo test --no-run --all ${{ matrix.release-flag }}
+      - name: Build tests
+        run: cargo test --no-run --all --exclude niri-visual-tests ${{ matrix.release-flag }}
 
       - name: Test
-        run: cargo test --all ${{ matrix.release-flag }} -- --nocapture
+        run: cargo test --all --exclude niri-visual-tests ${{ matrix.release-flag }} -- --nocapture
+
+  visual-tests:
+    strategy:
+      fail-fast: false
+
+    name: visual tests
+    runs-on: ubuntu-24.04
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          show-progress: false
+
+      - name: Install dependencies
+        run: |
+          sudo apt-get update -y
+          sudo apt-get install -y curl gcc clang libudev-dev libgbm-dev libxkbcommon-dev libegl1-mesa-dev libwayland-dev libinput-dev libdbus-1-dev libsystemd-dev libseat-dev libpipewire-0.3-dev libpango1.0-dev libdisplay-info-dev libadwaita-1-dev
+
+      - uses: dtolnay/rust-toolchain@stable
+
+      - uses: Swatinem/rust-cache@v2
+
+      - name: Build
+        run: cargo build --package niri-visual-tests
+
+  msrv:
+    strategy:
+      fail-fast: false
+
+    name: 'msrv - 1.80.1'
+    runs-on: ubuntu-24.04
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          show-progress: false
+
+      - name: Install dependencies
+        run: |
+          sudo apt-get update -y
+          sudo apt-get install -y curl gcc clang libudev-dev libgbm-dev libxkbcommon-dev libegl1-mesa-dev libwayland-dev libinput-dev libdbus-1-dev libsystemd-dev libseat-dev libpipewire-0.3-dev libpango1.0-dev libdisplay-info-dev libadwaita-1-dev
+
+      - uses: dtolnay/rust-toolchain@1.80.1
+
+      - uses: Swatinem/rust-cache@v2
+
+      - run: cargo check --all-targets
 
   clippy:
     strategy:
       fail-fast: false
 
     name: clippy
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
 
     steps:
       - uses: actions/checkout@v4
@@ -75,15 +129,12 @@ jobs:
 
       - name: Install dependencies
         run: |
-          sudo apt-get install -y software-properties-common
-          sudo add-apt-repository -y ppa:pipewire-debian/pipewire-upstream
           sudo apt-get update -y
-          sudo apt-get install -y libudev-dev libgbm-dev libxkbcommon-dev libegl1-mesa-dev libwayland-dev libinput-dev libdbus-1-dev libsystemd-dev libseat-dev libpipewire-0.3-dev
+          sudo apt-get install -y curl gcc clang libudev-dev libgbm-dev libxkbcommon-dev libegl1-mesa-dev libwayland-dev libinput-dev libdbus-1-dev libsystemd-dev libseat-dev libpipewire-0.3-dev libpango1.0-dev libdisplay-info-dev libadwaita-1-dev
 
-      - name: Install Rust
-        run: |
-          rustup set auto-self-update check-only
-          rustup toolchain install stable --profile minimal --component clippy
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: clippy
 
       - uses: Swatinem/rust-cache@v2
 
@@ -91,19 +142,89 @@ jobs:
         run: cargo clippy --all --all-targets
 
   rustfmt:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
 
     steps:
       - uses: actions/checkout@v4
         with:
           show-progress: false
 
-      - name: Install Rust
-        run: |
-          rustup set auto-self-update check-only
-          rustup toolchain install nightly --profile minimal --component rustfmt
-          rustup override set nightly
+      - uses: dtolnay/rust-toolchain@nightly
+        with:
+          components: rustfmt
 
       - name: Run rustfmt
         run: cargo fmt --all -- --check
 
+  fedora:
+    runs-on: ubuntu-24.04
+    container: fedora:41
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          show-progress: false
+
+      - name: Install dependencies
+        run: |
+          sudo dnf update -y
+          sudo dnf install -y cargo gcc libudev-devel libgbm-devel libxkbcommon-devel wayland-devel libinput-devel dbus-devel systemd-devel libseat-devel pipewire-devel pango-devel cairo-gobject-devel clang libdisplay-info-devel libadwaita-devel
+
+      - uses: Swatinem/rust-cache@v2
+      - run: cargo build --all
+
+  nix:
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          show-progress: false
+
+      - name: Check flake inputs
+        uses: DeterminateSystems/flake-checker-action@v4
+        continue-on-error: true
+
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@v3
+        continue-on-error: true
+
+      - run: nix flake check
+        continue-on-error: true
+
+  publish-wiki:
+    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+    needs: build
+    permissions:
+      contents: write
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          lfs: true
+          show-progress: false
+      - uses: Andrew-Chen-Wang/github-wiki-action@86138cbd6328b21d759e89ab6e6dd6a139b22270
+
+  rustdoc:
+    needs: build
+    permissions:
+      contents: write
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          show-progress: false
+
+      - uses: dtolnay/rust-toolchain@stable
+
+      - name: Generate documentation
+        run: cargo doc --no-deps -p niri-ipc
+
+      - run: cp ./resources/rustdoc-index.html ./target/doc/index.html
+
+      - name: Deploy documentation
+        if: github.ref == 'refs/heads/main'
+        uses: peaceiris/actions-gh-pages@v4
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./target/doc
+          force_orphan: true

.github/workflows/release.yml

@@ -0,0 +1,63 @@
+name: Prepare release
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'Public version'
+        required: true
+
+concurrency:
+  group: ${{ github.workflow }}
+  cancel-in-progress: true
+
+env:
+  RUN_SLOW_TESTS: 1
+
+jobs:
+  prepare-release:
+    runs-on: ubuntu-24.04
+
+    permissions:
+      contents: write
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          show-progress: false
+
+      - name: Check for unreplaced "Since:" in the wiki
+        run: |
+          if grep --recursive 'Since: next release' wiki; then
+            exit 1
+          fi
+
+      - name: Install dependencies
+        run: |
+          sudo apt-get update -y
+          sudo apt-get install -y curl gcc clang libudev-dev libgbm-dev libxkbcommon-dev libegl1-mesa-dev libwayland-dev libinput-dev libdbus-1-dev libsystemd-dev libseat-dev libpipewire-0.3-dev libpango1.0-dev libdisplay-info-dev libadwaita-1-dev
+
+      - uses: dtolnay/rust-toolchain@stable
+
+      - name: Create vendored dependencies archive
+        run: |
+          mkdir .cargo
+          cargo vendor --locked > .cargo/config.toml
+          tar cJf niri-${{ github.event.inputs.version }}-vendored-dependencies.tar.xz vendor/
+
+      - name: Build
+        run: cargo build --all --frozen --release
+
+      - name: Build tests
+        run: cargo test --no-run --all --frozen --release
+
+      - name: Test
+        run: cargo test --all --frozen --release -- --nocapture
+
+      - name: Draft release
+        uses: softprops/action-gh-release@v2
+        with:
+          draft: true
+          tag_name: v${{ github.event.inputs.version }}
+          files: niri-${{ github.event.inputs.version }}-vendored-dependencies.tar.xz
+          fail_on_unmatched_files: true

.gitignore

@@ -1 +1,2 @@
 /target
+/result

Cargo.toml

@@ -1,48 +1,97 @@
-[package]
-name = "niri"
-version = "0.1.0-alpha.2"
+[workspace]
+members = [
+    "niri-config",
+    "niri-ipc",
+    "niri-visual-tests",
+]
+
+[workspace.package]
+version = "25.1.0"
 description = "A scrollable-tiling Wayland compositor"
 authors = ["Ivan Molodetskikh <yalterz@gmail.com>"]
 license = "GPL-3.0-or-later"
 edition = "2021"
-
-readme = "README.md"
 repository = "https://github.com/YaLTeR/niri"
-keywords = ["wayland", "compositor", "tiling", "smithay", "wm"]
+rust-version = "1.80"
 
-[dependencies]
-anyhow = { version = "1.0.75" }
-arrayvec = "0.7.4"
-async-channel = { version = "2.1.1", optional = true }
-async-io = { version = "1.13.0", optional = true }
-bitflags = "2.4.1"
-clap = { version = "4.4.11", features = ["derive"] }
-directories = "5.0.1"
-git-version = "0.3.9"
-keyframe = { version = "1.1.1", default-features = false }
-knuffel = "3.2.0"
-libc = "0.2.151"
-logind-zbus = { version = "3.1.2", optional = true }
-log = { version = "0.4.20", features = ["max_level_trace", "release_max_level_debug"] }
-miette = "5.10.0"
-notify-rust = { version = "4.10.0", optional = true }
-pipewire = { version = "0.7.2", optional = true }
-png = "0.17.10"
-portable-atomic = { version = "1.6.0", default-features = false, features = ["float"] }
-profiling = "1.0.12"
-sd-notify = "0.4.1"
-serde = { version = "1.0.193", features = ["derive"] }
-tracing-subscriber = { version = "0.3.18", features = ["env-filter"] }
-tracing = { version = "0.1.40", features = ["max_level_trace", "release_max_level_debug"] }
-tracy-client = { version = "0.16.4", default-features = false }
-url = { version = "2.5.0", optional = true }
-xcursor = "0.3.5"
-zbus = { version = "3.14.1", optional = true }
+[workspace.dependencies]
+anyhow = "1.0.95"
+bitflags = "2.7.0"
+clap = { version = "4.5.26", features = ["derive"] }
+insta = "1.42.0"
+serde = { version = "1.0.217", features = ["derive"] }
+serde_json = "1.0.135"
+tracing = { version = "0.1.41", features = ["max_level_trace", "release_max_level_debug"] }
+tracing-subscriber = { version = "0.3.19", features = ["env-filter"] }
+tracy-client = { version = "0.18.0", default-features = false }
 
-[dependencies.smithay]
+[workspace.dependencies.smithay]
 git = "https://github.com/Smithay/smithay.git"
 # path = "../smithay"
 default-features = false
+
+[workspace.dependencies.smithay-drm-extras]
+git = "https://github.com/Smithay/smithay.git"
+# path = "../smithay/smithay-drm-extras"
+
+[package]
+name = "niri"
+version.workspace = true
+description.workspace = true
+authors.workspace = true
+license.workspace = true
+edition.workspace = true
+repository.workspace = true
+rust-version.workspace = true
+
+readme = "README.md"
+keywords = ["wayland", "compositor", "tiling", "smithay", "wm"]
+
+[dependencies]
+anyhow.workspace = true
+arrayvec = "0.7.6"
+async-channel = "2.3.1"
+async-io = { version = "2.4.0", optional = true }
+atomic = "0.6.0"
+bitflags.workspace = true
+bytemuck = { version = "1.21.0", features = ["derive"] }
+calloop = { version = "0.14.2", features = ["executor", "futures-io"] }
+clap = { workspace = true, features = ["string"] }
+directories = "5.0.1"
+drm-ffi = "0.9.0"
+fastrand = "2.3.0"
+futures-util = { version = "0.3.31", default-features = false, features = ["std", "io"] }
+git-version = "0.3.9"
+glam = "0.29.2"
+input = { version = "0.9.1", features = ["libinput_1_21"] }
+keyframe = { version = "1.1.1", default-features = false }
+libc = "0.2.169"
+libdisplay-info = "0.2.2"
+log = { version = "0.4.22", features = ["max_level_trace", "release_max_level_debug"] }
+niri-config = { version = "25.1.0", path = "niri-config" }
+niri-ipc = { version = "25.1.0", path = "niri-ipc", features = ["clap"] }
+ordered-float = "4.6.0"
+pango = { version = "0.20.7", features = ["v1_44"] }
+pangocairo = "0.20.7"
+pipewire = { git = "https://gitlab.freedesktop.org/pipewire/pipewire-rs.git", optional = true, features = ["v0_3_33"] }
+png = "0.17.16"
+portable-atomic = { version = "1.10.0", default-features = false, features = ["float"] }
+profiling = "1.0.16"
+sd-notify = "0.4.3"
+serde.workspace = true
+serde_json.workspace = true
+smithay-drm-extras.workspace = true
+tracing-subscriber.workspace = true
+tracing.workspace = true
+tracy-client.workspace = true
+url = { version = "2.5.4", optional = true }
+wayland-backend = "0.3.7"
+wayland-scanner = "0.31.5"
+xcursor = "0.3.8"
+zbus = { version = "5.2.0", optional = true }
+
+[dependencies.smithay]
+workspace = true
 features = [
     "backend_drm",
     "backend_egl",
@@ -53,35 +102,54 @@ features = [
     "backend_winit",
     "desktop",
     "renderer_gl",
+    "renderer_pixman",
     "renderer_multi",
     "use_system_lib",
     "wayland_frontend",
 ]
 
-[dependencies.smithay-drm-extras]
-git = "https://github.com/Smithay/smithay.git"
-# path = "../smithay/smithay-drm-extras"
-
 [dev-dependencies]
-proptest = "1.4.0"
-proptest-derive = "0.4.0"
+approx = "0.5.1"
+calloop-wayland-source = "0.4.0"
+insta.workspace = true
+proptest = "1.6.0"
+proptest-derive = { version = "0.5.1", features = ["boxed_union"] }
+rayon = "1.10.0"
+wayland-client = "0.31.7"
+xshell = "0.2.7"
 
 [features]
-default = ["dbus", "xdp-gnome-screencast"]
-# Enables DBus support (required for xdp-gnome and power button inhibiting).
-dbus = ["zbus", "logind-zbus", "async-channel", "async-io", "notify-rust", "url"]
+default = ["dbus", "systemd", "xdp-gnome-screencast"]
+# Enables D-Bus support (serve various freedesktop and GNOME interfaces, power button handling).
+dbus = ["dep:zbus", "dep:async-io", "dep:url"]
+# Enables systemd integration (global environment, apps in transient scopes).
+systemd = ["dbus"]
 # Enables screencasting support through xdg-desktop-portal-gnome.
 xdp-gnome-screencast = ["dbus", "pipewire"]
 # Enables the Tracy profiler instrumentation.
 profile-with-tracy = ["profiling/profile-with-tracy", "tracy-client/default"]
+# Enables the on-demand Tracy profiler instrumentation.
+profile-with-tracy-ondemand = ["profile-with-tracy", "tracy-client/ondemand", "tracy-client/manual-lifetime"]
+# Enables Tracy allocation profiling.
+profile-with-tracy-allocations = ["profile-with-tracy"]
+# Enables dinit integration (global environment).
+dinit = []
 
 [profile.release]
 debug = "line-tables-only"
 overflow-checks = true
 lto = "thin"
 
+[profile.release.package.niri-config]
+# knuffel with chomsky generates a metric ton of debuginfo.
+debug = false
+
+[profile.dev.package]
+insta.opt-level = 3
+similar.opt-level = 3
+
 [package.metadata.generate-rpm]
-version = "0.1.0~alpha.2"
+version = "25.01"
 assets = [
     { source = "target/release/niri", dest = "/usr/bin/", mode = "755" },
     { source = "resources/niri-session", dest = "/usr/bin/", mode = "755" },
@@ -92,3 +160,15 @@ assets = [
 ]
 [package.metadata.generate-rpm.requires]
 alacritty = "*"
+fuzzel = "*"
+
+[package.metadata.deb]
+depends = "alacritty, fuzzel"
+assets = [
+    ["target/release/niri", "usr/bin/", "755"],
+    ["resources/niri-session", "usr/bin/", "755"],
+    ["resources/niri.desktop", "/usr/share/wayland-sessions/", "644"],
+    ["resources/niri-portals.conf", "/usr/share/xdg-desktop-portal/", "644"],
+    ["resources/niri.service", "/usr/lib/systemd/user/", "644"],
+    ["resources/niri-shutdown.target", "/usr/lib/systemd/user/", "644"],
+]

README.md

@@ -1,154 +1,108 @@
-# niri
+<h1 align="center">niri</h1>
+<p align="center">A scrollable-tiling Wayland compositor.</p>
+<p align="center">
+    <a href="https://matrix.to/#/#niri:matrix.org"><img alt="Matrix" src="https://img.shields.io/badge/matrix-%23niri-blue?logo=matrix"></a>
+    <a href="https://github.com/YaLTeR/niri/blob/main/LICENSE"><img alt="GitHub License" src="https://img.shields.io/github/license/YaLTeR/niri"></a>
+    <a href="https://github.com/YaLTeR/niri/releases"><img alt="GitHub Release" src="https://img.shields.io/github/v/release/YaLTeR/niri?logo=github"></a>
+</p>
 
-A scrollable-tiling Wayland compositor.
+<p align="center">
+    <a href="https://github.com/YaLTeR/niri/wiki/Getting-Started">Getting Started</a> | <a href="https://github.com/YaLTeR/niri/wiki/Configuration:-Overview">Configuration</a> | <a href="https://github.com/YaLTeR/niri/discussions/325">Setup&nbsp;Showcase</a>
+</p>
 
-![](https://github.com/YaLTeR/niri/assets/1794388/e35fd9e1-105b-4bd5-94c9-207fd6fb3c18)
+![niri with a few windows open](https://github.com/user-attachments/assets/d142e57d-a25d-4ddb-ab46-311417458211)
+
+## About
+
+Windows are arranged in columns on an infinite strip going to the right.
+Opening a new window never causes existing windows to resize.
+
+Every monitor has its own separate window strip.
+Windows can never "overflow" onto an adjacent monitor.
+
+Workspaces are dynamic and arranged vertically.
+Every monitor has an independent set of workspaces, and there's always one empty workspace present all the way down.
+
+The workspace arrangement is preserved across disconnecting and connecting monitors where it makes sense.
+When a monitor disconnects, its workspaces will move to another monitor, but upon reconnection they will move back to the original monitor.
+
+## Features
+
+- Built from the ground up for scrollable tiling
+- Dynamic workspaces like in GNOME
+- Built-in screenshot UI
+- Monitor and window screencasting through xdg-desktop-portal-gnome
+    - You can [block out](https://github.com/YaLTeR/niri/wiki/Configuration:-Window-Rules#block-out-from) sensitive windows from screencasts
+- [Touchpad](https://github.com/YaLTeR/niri/assets/1794388/946a910e-9bec-4cd1-a923-4a9421707515) and [mouse](https://github.com/YaLTeR/niri/assets/1794388/8464e65d-4bf2-44fa-8c8e-5883355bd000) gestures
+- Configurable layout: gaps, borders, struts, window sizes
+- [Gradient borders](https://github.com/YaLTeR/niri/wiki/Configuration:-Layout#gradients) with Oklab and Oklch support
+- [Animations](https://github.com/YaLTeR/niri/assets/1794388/ce178da2-af9e-4c51-876f-8709c241d95e) with support for [custom shaders](https://github.com/YaLTeR/niri/assets/1794388/27a238d6-0a22-4692-b794-30dc7a626fad)
+- Live-reloading config
+
+## Video Demo
+
+https://github.com/YaLTeR/niri/assets/1794388/bce834b0-f205-434e-a027-b373495f9729
 
 ## Status
 
-A lot of the essential functionality is implemented, plus some goodies on top.
-Feel free to give niri a try.
-Have your waybars and fuzzels ready: niri is not a complete desktop environment.
+Niri is stable for day-to-day use and does most things expected of a Wayland compositor.
+Many people are daily-driving niri, and are happy to help in our [Matrix channel].
 
-https://github.com/YaLTeR/niri/assets/1794388/5d355694-7b06-4f00-8920-8dce54a8721c
+Give it a try!
+Follow the instructions on the [Getting Started](https://github.com/YaLTeR/niri/wiki/Getting-Started) wiki page.
+Have your [waybar]s and [fuzzel]s ready: niri is not a complete desktop environment.
 
-## Idea
+Here are some points you may have questions about:
 
-Niri implements scrollable tiling, heavily inspired by [PaperWM].
-Windows are arranged in columns on an infinite strip going to the right.
-Every column takes up a full monitor worth of height, divided among its windows.
+- **Multi-monitor**: yes, a core part of the design from the very start. Mixed DPI works.
+- **Fractional scaling**: yes, plus all niri UI stays pixel-perfect.
+- **NVIDIA**: seems to work fine.
+- **Floating windows**: yes, starting from niri 25.01.
+- **Input devices**: niri supports tablets, touchpads, and touchscreens.
+You can map the tablet to a specific monitor, or use [OpenTabletDriver].
+We have touchpad gestures, but no touchscreen gestures yet.
+- **Wlr protocols**: yes, we have most of the important ones like layer-shell, gamma-control, screencopy.
+You can check on [wayland.app](https://wayland.app) at the bottom of each protocol's page.
+- **Performance**: while I run niri on beefy machines, I try to stay conscious of performance.
+I've seen someone use it fine on an Eee PC 900 from 2008, of all things.
+- **Xwayland**: no built-in support, but xwayland-satellite is [easy to set up](https://github.com/YaLTeR/niri/wiki/Xwayland#using-xwayland-satellite) and works very well.
+    - Steam and games, including Proton: work perfectly through xwayland-satellite.
+    - JetBrains IDEs, Ghidra: work well through xwayland-satellite.
+    - Discord and other Electron apps: work well through xwayland-satellite.
+    - Chromium and VSCode: work perfectly natively on Wayland with the right flags.
+    - X11 apps that want to position windows or bars at specific screen coordinates: won't work well; you can run them in a nested compositor like [labwc](https://github.com/YaLTeR/niri/wiki/Xwayland#using-the-labwc-wayland-compositor) or [rootful Xwayland](https://github.com/YaLTeR/niri/wiki/Xwayland#directly-running-xwayland-in-rootful-mode).
+    - Display scaling (integer or fractional) will make X11 apps look blurry; this needs to be supported in xwayland-satellite.
+    For games, you can run them in [gamescope] at native resolution, even with display scaling.
 
-With multiple monitors, every monitor has its own separate window strip.
-Windows can never "overflow" onto an adjacent monitor.
+## Inspiration
 
-This is one of the reasons that prompted me to try writing my own compositor.
-PaperWM is a solid implementation, but, being a GNOME Shell extension, it has to work around Shell's global window coordinate space to prevent windows from overflowing.
+Niri is heavily inspired by [PaperWM] which implements scrollable tiling on top of GNOME Shell.
 
-Niri also has dynamic workspaces which work similar to GNOME Shell.
-Since windows go left-to-right horizontally, workspaces are arranged vertically.
-Every monitor has an independent set of workspaces, and there's always one empty workspace present all the way down.
+One of the reasons that prompted me to try writing my own compositor is being able to properly separate the monitors.
+Being a GNOME Shell extension, PaperWM has to work against Shell's global window coordinate space to prevent windows from overflowing.
 
-Niri tries to preserve the workspace arrangement as much as possible upon disconnecting and connecting monitors.
-When a monitor disconnects, its workspaces will move to another monitor, but upon reconnection they will move back to the original monitor.
+## Tile Scrollably Elsewhere
 
-## Building
+Here are some other projects which implement a similar workflow:
 
-For Fedora users, there's a COPR with built and packaged niri: https://copr.fedorainfracloud.org/coprs/yalter/niri/
+- [PaperWM]: scrollable tiling on top of GNOME Shell.
+- [karousel]: scrollable tiling on top of KDE.
+- [papersway]: scrollable tiling on top of sway/i3.
+- [hyprscroller] and [hyprslidr]: scrollable tiling on top of Hyprland.
+- [PaperWM.spoon]: scrollable tiling on top of macOS.
 
-First, install the dependencies for your distribution.
+## Contact
 
-- Ubuntu:
-
-    ```sh
-    sudo apt-get install -y software-properties-common
-    sudo add-apt-repository -y ppa:pipewire-debian/pipewire-upstream
-    sudo apt-get update -y
-    sudo apt-get install -y libudev-dev libgbm-dev libxkbcommon-dev libegl1-mesa-dev libwayland-dev libinput-dev libdbus-1-dev libsystemd-dev libseat-dev libpipewire-0.3-dev
-    ```
-
-- Fedora:
-
-    ```sh
-    sudo dnf install gcc libudev-devel libgbm-devel libxkbcommon-devel wayland-devel libinput-devel dbus-devel systemd-devel libseat-devel pipewire-devel clang
-    ```
-
-Next, build niri with `cargo build --release`.
-
-## Installation
-
-The recommended way to install and run niri is as a standalone desktop session.
-To do that, put files into the correct directories according to this table.
-
-| File | Destination |
-| ---- | ----------- |
-| `target/release/niri` | `/usr/bin/` |
-| `resources/niri-session` | `/usr/bin/` |
-| `resources/niri.desktop` | `/usr/share/wayland-sessions/` |
-| `resources/niri-portals.conf` | `/usr/share/xdg-desktop-portal/` |
-| `resources/niri.service` | `/usr/lib/systemd/user/` |
-| `resources/niri-shutdown.target` | `/usr/lib/systemd/user/` |
-
-Doing this will make niri appear in GDM and, presumably, other display managers.
-
-## Running
-
-`cargo run --release`
-
-Inside an existing desktop session, it will run in a window.
-On a TTY, it will run natively.
-
-To exit when running on a TTY, press <kbd>Super</kbd><kbd>Shift</kbd><kbd>E</kbd>.
-
-### Session
-
-If you followed the recommended installation steps above, niri should appear in your display manager.
-Starting it from there will run niri as a desktop session.
-
-The niri session will autostart apps through the systemd xdg-autostart target.
-You can also autostart systemd services like [mako] by symlinking them into `$HOME/.config/systemd/user/niri.service.wants/`.
-A step-by-step process for this is explained [on the wiki](https://github.com/YaLTeR/niri/wiki/Example-systemd-Setup).
-
-Niri also works with some parts of xdg-desktop-portal-gnome.
-In particular, it supports file choosers and monitor screencasting (e.g. to [OBS]).
-
-## Default Hotkeys
-
-When running on a TTY, the Mod key is <kbd>Super</kbd>.
-When running in a window, the Mod key is <kbd>Alt</kbd>.
-
-The general system is: if a hotkey switches somewhere, then adding <kbd>Ctrl</kbd> will move the focused window or column there.
-
-| Hotkey | Description |
-| ------ | ----------- |
-| <kbd>Mod</kbd><kbd>T</kbd> | Spawn `alacritty` (terminal) |
-| <kbd>Mod</kbd><kbd>D</kbd> | Spawn `fuzzel` (application launcher) |
-| <kbd>Mod</kbd><kbd>Alt</kbd><kbd>L</kbd> | Spawn `swaylock` (screen locker) |
-| <kbd>Mod</kbd><kbd>Q</kbd> | Close the focused window |
-| <kbd>Mod</kbd><kbd>H</kbd> or <kbd>Mod</kbd><kbd>←</kbd> | Focus the column to the left |
-| <kbd>Mod</kbd><kbd>L</kbd> or <kbd>Mod</kbd><kbd>→</kbd> | Focus the column to the right |
-| <kbd>Mod</kbd><kbd>J</kbd> or <kbd>Mod</kbd><kbd>↓</kbd> | Focus the window below in a column |
-| <kbd>Mod</kbd><kbd>K</kbd> or <kbd>Mod</kbd><kbd>↑</kbd> | Focus the window above in a column |
-| <kbd>Mod</kbd><kbd>Ctrl</kbd><kbd>H</kbd> or <kbd>Mod</kbd><kbd>Ctrl</kbd><kbd>←</kbd> | Move the focused column to the left |
-| <kbd>Mod</kbd><kbd>Ctrl</kbd><kbd>L</kbd> or <kbd>Mod</kbd><kbd>Ctrl</kbd><kbd>→</kbd> | Move the focused column to the right |
-| <kbd>Mod</kbd><kbd>Ctrl</kbd><kbd>J</kbd> or <kbd>Mod</kbd><kbd>Ctrl</kbd><kbd>↓</kbd> | Move the focused window below in a column |
-| <kbd>Mod</kbd><kbd>Ctrl</kbd><kbd>K</kbd> or <kbd>Mod</kbd><kbd>Ctrl</kbd><kbd>↑</kbd> | Move the focused window above in a column |
-| <kbd>Mod</kbd><kbd>Shift</kbd><kbd>H</kbd><kbd>J</kbd><kbd>K</kbd><kbd>L</kbd> or <kbd>Mod</kbd><kbd>Shift</kbd><kbd>←</kbd><kbd>↓</kbd><kbd>↑</kbd><kbd>→</kbd> | Focus the monitor to the side |
-| <kbd>Mod</kbd><kbd>Ctrl</kbd><kbd>Shift</kbd><kbd>H</kbd><kbd>J</kbd><kbd>K</kbd><kbd>L</kbd> or <kbd>Mod</kbd><kbd>Ctrl</kbd><kbd>Shift</kbd><kbd>←</kbd><kbd>↓</kbd><kbd>↑</kbd><kbd>→</kbd> | Move the focused window to the monitor to the side |
-| <kbd>Mod</kbd><kbd>U</kbd> or <kbd>Mod</kbd><kbd>PageDown</kbd> | Switch to the workspace below |
-| <kbd>Mod</kbd><kbd>I</kbd> or <kbd>Mod</kbd><kbd>PageUp</kbd> | Switch to the workspace above |
-| <kbd>Mod</kbd><kbd>Ctrl</kbd><kbd>U</kbd> or <kbd>Mod</kbd><kbd>Ctrl</kbd><kbd>PageDown</kbd> | Move the focused window to the workspace below |
-| <kbd>Mod</kbd><kbd>Ctrl</kbd><kbd>I</kbd> or <kbd>Mod</kbd><kbd>Ctrl</kbd><kbd>PageUp</kbd> | Move the focused window to the workspace above |
-| <kbd>Mod</kbd><kbd>1</kbd>–<kbd>9</kbd> | Switch to a workspace by index |
-| <kbd>Mod</kbd><kbd>Ctrl</kbd><kbd>1</kbd>–<kbd>9</kbd> | Move the focused window to a workspace by index |
-| <kbd>Mod</kbd><kbd>Shift</kbd><kbd>U</kbd> or <kbd>Mod</kbd><kbd>Shift</kbd><kbd>PageDown</kbd> | Move the focused workspace down |
-| <kbd>Mod</kbd><kbd>Shift</kbd><kbd>I</kbd> or <kbd>Mod</kbd><kbd>Shift</kbd><kbd>PageUp</kbd> | Move the focused workspace up |
-| <kbd>Mod</kbd><kbd>,</kbd> | Consume the window to the right into the focused column |
-| <kbd>Mod</kbd><kbd>.</kbd> | Expel the focused window into its own column |
-| <kbd>Mod</kbd><kbd>R</kbd> | Toggle between preset column widths |
-| <kbd>Mod</kbd><kbd>F</kbd> | Maximize column |
-| <kbd>Mod</kbd><kbd>C</kbd> | Center column within view |
-| <kbd>Mod</kbd><kbd>-</kbd> | Decrease column width by 10% |
-| <kbd>Mod</kbd><kbd>=</kbd> | Increase column width by 10% |
-| <kbd>Mod</kbd><kbd>Shift</kbd><kbd>-</kbd> | Decrease window height by 10% |
-| <kbd>Mod</kbd><kbd>Shift</kbd><kbd>=</kbd> | Increase window height by 10% |
-| <kbd>Mod</kbd><kbd>Shift</kbd><kbd>F</kbd> | Toggle full-screen on the focused window |
-| <kbd>PrtSc</kbd> | Take an area screenshot. Select the area to screenshot with mouse, then press Space to save the screenshot, or Escape to cancel |
-| <kbd>Alt</kbd><kbd>PrtSc</kbd> | Take a screenshot of the focused window to clipboard and to `~/Pictures/Screenshots/` |
-| <kbd>Ctrl</kbd><kbd>PrtSc</kbd> | Take a screenshot of the focused monitor to clipboard and to `~/Pictures/Screenshots/` |
-| <kbd>Mod</kbd><kbd>Ctrl</kbd><kbd>Shift</kbd><kbd>T</kbd> | Toggle debug tinting of rendered elements |
-| <kbd>Mod</kbd><kbd>Shift</kbd><kbd>E</kbd> | Exit niri |
-
-## Configuration
-
-Niri will load configuration from `$XDG_CONFIG_HOME/.config/niri/config.kdl` or `~/.config/niri/config.kdl`.
-If this fails, it will load [the default configuration file](resources/default-config.kdl).
-Please use the default configuration file as the starting point for your custom configuration.
-
-Niri will live-reload many of the configuration settings, like key binds or gaps, as you change the config file.
-Though, some settings are still missing live-reload support.
-Notably, output modes and positions will only apply when the output is reconnected.
+We have a Matrix chat, feel free to join and ask a question: https://matrix.to/#/#niri:matrix.org
 
 [PaperWM]: https://github.com/paperwm/PaperWM
-[mako]: https://github.com/emersion/mako
-[OBS]: https://flathub.org/apps/com.obsproject.Studio
-
+[waybar]: https://github.com/Alexays/Waybar
+[fuzzel]: https://codeberg.org/dnkl/fuzzel
+[karousel]: https://github.com/peterfajdiga/karousel
+[papersway]: https://spwhitton.name/tech/code/papersway/
+[hyprscroller]: https://github.com/dawsers/hyprscroller
+[hyprslidr]: https://gitlab.com/magus/hyprslidr
+[PaperWM.spoon]: https://github.com/mogenson/PaperWM.spoon
+[Matrix channel]: https://matrix.to/#/#niri:matrix.org
+[OpenTabletDriver]: https://opentabletdriver.net/
+[gamescope]: https://github.com/ValveSoftware/gamescope

clippy.toml

@@ -0,0 +1,5 @@
+ignore-interior-mutability = [
+    "smithay::desktop::Window",
+    "smithay::output::Output",
+    "wayland_server::backend::ClientId",
+]

flake.lock

@@ -0,0 +1,64 @@
+{
+  "nodes": {
+    "nix-filter": {
+      "locked": {
+        "lastModified": 1731533336,
+        "narHash": "sha256-oRam5PS1vcrr5UPgALW0eo1m/5/pls27Z/pabHNy2Ms=",
+        "owner": "numtide",
+        "repo": "nix-filter",
+        "rev": "f7653272fd234696ae94229839a99b73c9ab7de0",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "nix-filter",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1733064805,
+        "narHash": "sha256-7NbtSLfZO0q7MXPl5hzA0sbVJt6pWxxtGWbaVUDDmjs=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "31d66ae40417bb13765b0ad75dd200400e98de84",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nix-filter": "nix-filter",
+        "nixpkgs": "nixpkgs",
+        "rust-overlay": "rust-overlay"
+      }
+    },
+    "rust-overlay": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1733106880,
+        "narHash": "sha256-aJmAIjZfWfPSWSExwrYBLRgXVvgF5LP1vaeUGOOIQ98=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "e66c0d43abf5bdefb664c3583ca8994983c332ae",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,254 @@
+# This flake file is community maintained
+{
+  description = "Niri: A scrollable-tiling Wayland compositor.";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    nix-filter.url = "github:numtide/nix-filter";
+
+    # NOTE: This is not necessary for end users
+    # You can omit it with `inputs.rust-overlay.follows = ""`
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
+
+  outputs =
+    {
+      self,
+      nixpkgs,
+      nix-filter,
+      rust-overlay,
+    }:
+    let
+      niri-package =
+        {
+          lib,
+          cairo,
+          dbus,
+          libGL,
+          libdisplay-info,
+          libinput,
+          seatd,
+          libxkbcommon,
+          mesa,
+          pango,
+          pipewire,
+          pkg-config,
+          rustPlatform,
+          systemd,
+          wayland,
+          withDbus ? true,
+          withSystemd ? true,
+          withScreencastSupport ? true,
+          withDinit ? false,
+        }:
+
+        rustPlatform.buildRustPackage {
+          pname = "niri";
+          version = self.shortRev or self.dirtyShortRev or "unknown";
+
+          src = nix-filter.lib.filter {
+            root = self;
+            include = [
+              "niri-config"
+              "niri-ipc"
+              "niri-visual-tests"
+              "resources"
+              "src"
+              ./Cargo.lock
+              ./Cargo.toml
+            ];
+          };
+
+          postPatch = ''
+            patchShebangs resources/niri-session
+            substituteInPlace resources/niri.service \
+              --replace-fail '/usr/bin' "$out/bin"
+          '';
+
+          cargoLock = {
+            # NOTE: This is only used for Git dependencies
+            allowBuiltinFetchGit = true;
+            lockFile = ./Cargo.lock;
+          };
+
+          strictDeps = true;
+
+          nativeBuildInputs = [
+            rustPlatform.bindgenHook
+            pkg-config
+          ];
+
+          buildInputs =
+            [
+              cairo
+              dbus
+              libGL
+              libdisplay-info
+              libinput
+              seatd
+              libxkbcommon
+              mesa # libgbm
+              pango
+              wayland
+            ]
+            ++ lib.optional (withDbus || withScreencastSupport || withSystemd) dbus
+            ++ lib.optional withScreencastSupport pipewire
+            # Also includes libudev
+            ++ lib.optional withSystemd systemd;
+
+          buildFeatures =
+            lib.optional withDbus "dbus"
+            ++ lib.optional withDinit "dinit"
+            ++ lib.optional withScreencastSupport "xdp-gnome-screencast"
+            ++ lib.optional withSystemd "systemd";
+          buildNoDefaultFeatures = true;
+
+          # ever since this commit:
+          # https://github.com/YaLTeR/niri/commit/771ea1e81557ffe7af9cbdbec161601575b64d81
+          # niri now runs an actual instance of the real compositor (with a mock backend) during tests
+          # and thus creates a real socket file in the runtime dir.
+          # this is fine for our build, we just need to make sure it has a directory to write to.
+          preCheck = ''
+            export XDG_RUNTIME_DIR="$(mktemp -d)"
+          '';
+
+          postInstall =
+            ''
+              install -Dm644 resources/niri.desktop -t $out/share/wayland-sessions
+              install -Dm644 resources/niri-portals.conf -t $out/share/xdg-desktop-portal
+            ''
+            + lib.optionalString withSystemd ''
+              install -Dm755 resources/niri-session $out/bin/niri-session
+              install -Dm644 resources/niri{.service,-shutdown.target} -t $out/share/systemd/user
+            '';
+
+          env = {
+            # Force linking with libEGL and libwayland-client
+            # so they can be discovered by `dlopen()`
+            RUSTFLAGS = toString (
+              map (arg: "-C link-arg=" + arg) [
+                "-Wl,--push-state,--no-as-needed"
+                "-lEGL"
+                "-lwayland-client"
+                "-Wl,--pop-state"
+              ]
+            );
+          };
+
+          passthru = {
+            providedSessions = [ "niri" ];
+          };
+
+          meta = {
+            description = "Scrollable-tiling Wayland compositor";
+            homepage = "https://github.com/YaLTeR/niri";
+            license = lib.licenses.gpl3Only;
+            mainProgram = "niri";
+            platforms = lib.platforms.linux;
+          };
+        };
+
+      inherit (nixpkgs) lib;
+      # Support all Linux systems that the nixpkgs flake exposes
+      systems = lib.intersectLists lib.systems.flakeExposed lib.platforms.linux;
+
+      forAllSystems = lib.genAttrs systems;
+      nixpkgsFor = forAllSystems (system: nixpkgs.legacyPackages.${system});
+    in
+    {
+      checks = forAllSystems (system: {
+        # We use the debug build here to save a bit of time
+        inherit (self.packages.${system}) niri-debug;
+      });
+
+      devShells = forAllSystems (
+        system:
+        let
+          pkgs = nixpkgsFor.${system};
+          rust-bin = rust-overlay.lib.mkRustBin { } pkgs;
+          inherit (self.packages.${system}) niri;
+        in
+        {
+          default = pkgs.mkShell {
+            packages = [
+              # We don't use the toolchain from nixpkgs
+              # because we prefer a nightly toolchain
+              # and we *require* a nightly rustfmt
+              (rust-bin.selectLatestNightlyWith (
+                toolchain:
+                toolchain.default.override {
+                  extensions = [
+                    # includes already:
+                    # rustc
+                    # cargo
+                    # rust-std
+                    # rust-docs
+                    # rustfmt-preview
+                    # clippy-preview
+                    "rust-analyzer"
+                    "rust-src"
+                  ];
+                }
+              ))
+            ];
+
+            nativeBuildInputs = [
+              pkgs.rustPlatform.bindgenHook
+              pkgs.pkg-config
+              pkgs.wrapGAppsHook4 # For `niri-visual-tests`
+            ];
+
+            buildInputs = niri.buildInputs ++ [
+              pkgs.libadwaita # For `niri-visual-tests`
+            ];
+
+            env = {
+              # WARN: Do not overwrite this variable in your shell!
+              # It is required for `dlopen()` to work on some libraries; see the comment
+              # in the package expression
+              #
+              # This should only be set with `CARGO_BUILD_RUSTFLAGS="$CARGO_BUILD_RUSTFLAGS -C your-flags"`
+              CARGO_BUILD_RUSTFLAGS = niri.RUSTFLAGS;
+            };
+          };
+        }
+      );
+
+      formatter = forAllSystems (system: nixpkgsFor.${system}.nixfmt-rfc-style);
+
+      packages = forAllSystems (
+        system:
+        let
+          niri = nixpkgsFor.${system}.callPackage niri-package { };
+        in
+        {
+          inherit niri;
+
+          # NOTE: This is for development purposes only
+          #
+          # It is primarily to help with quickly iterating on
+          # changes made to the above expression - though it is
+          # also not stripped in order to better debug niri itself
+          niri-debug = niri.overrideAttrs (
+            newAttrs: oldAttrs: {
+              pname = oldAttrs.pname + "-debug";
+
+              cargoBuildType = "debug";
+              cargoCheckType = newAttrs.cargoBuildType;
+
+              dontStrip = true;
+            }
+          );
+
+          default = niri;
+        }
+      );
+
+      overlays.default = final: _: {
+        niri = final.callPackage niri-package { };
+      };
+    };
+}

niri-config/Cargo.toml

@@ -0,0 +1,24 @@
+[package]
+name = "niri-config"
+version.workspace = true
+description.workspace = true
+authors.workspace = true
+license.workspace = true
+edition.workspace = true
+repository.workspace = true
+
+[dependencies]
+bitflags.workspace = true
+csscolorparser = "0.7.0"
+knuffel = "3.2.0"
+miette = "5.10.0"
+niri-ipc = { version = "25.1.0", path = "../niri-ipc" }
+regex = "1.11.1"
+smithay = { workspace = true, features = ["backend_libinput"] }
+tracing.workspace = true
+tracy-client.workspace = true
+
+[dev-dependencies]
+insta.workspace = true
+miette = { version = "5.10.0", features = ["fancy"] }
+pretty_assertions = "1.4.1"

niri-config/src/layer_rule.rs

@@ -0,0 +1,22 @@
+use crate::{BlockOutFrom, RegexEq};
+
+#[derive(knuffel::Decode, Debug, Default, Clone, PartialEq)]
+pub struct LayerRule {
+    #[knuffel(children(name = "match"))]
+    pub matches: Vec<Match>,
+    #[knuffel(children(name = "exclude"))]
+    pub excludes: Vec<Match>,
+
+    #[knuffel(child, unwrap(argument))]
+    pub opacity: Option<f32>,
+    #[knuffel(child, unwrap(argument))]
+    pub block_out_from: Option<BlockOutFrom>,
+}
+
+#[derive(knuffel::Decode, Debug, Default, Clone, PartialEq)]
+pub struct Match {
+    #[knuffel(property, str)]
+    pub namespace: Option<RegexEq>,
+    #[knuffel(property)]
+    pub at_startup: Option<bool>,
+}

niri-config/src/utils.rs

@@ -0,0 +1,23 @@
+use std::str::FromStr;
+
+use regex::Regex;
+
+/// `Regex` that implements `PartialEq` by its string form.
+#[derive(Debug, Clone)]
+pub struct RegexEq(pub Regex);
+
+impl PartialEq for RegexEq {
+    fn eq(&self, other: &Self) -> bool {
+        self.0.as_str() == other.0.as_str()
+    }
+}
+
+impl Eq for RegexEq {}
+
+impl FromStr for RegexEq {
+    type Err = <Regex as FromStr>::Err;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        Regex::from_str(s).map(Self)
+    }
+}

niri-config/tests/wiki-parses.rs

@@ -0,0 +1,111 @@
+use std::fs;
+use std::path::PathBuf;
+
+struct KdlCodeBlock {
+    filename: String,
+    code: String,
+    line_number: usize,
+    must_fail: bool,
+}
+
+fn extract_kdl_from_file(file_contents: &str, filename: &str) -> Vec<KdlCodeBlock> {
+    let mut lines = file_contents
+        .lines()
+        .map(|line| {
+            // Removes the > from callouts that might contain ```kdl```
+            let line = line.trim();
+            if line.starts_with('>') {
+                if line.len() == 1 {
+                    ""
+                } else {
+                    &line[2..]
+                }
+            } else {
+                line
+            }
+        })
+        .enumerate();
+
+    let mut kdl_code_blocks = vec![];
+
+    while let Some((line_number, line)) = lines.next() {
+        if !line.starts_with("```kdl") {
+            continue;
+        }
+
+        let mut snippet = String::new();
+
+        for (_, line) in lines
+            .by_ref()
+            .take_while(|(_, line)| !line.starts_with("```"))
+        {
+            snippet.push_str(line);
+            snippet.push('\n');
+        }
+
+        kdl_code_blocks.push(KdlCodeBlock {
+            code: snippet,
+            line_number,
+            filename: filename.to_string(),
+            must_fail: line.contains("must-fail"),
+        });
+    }
+
+    kdl_code_blocks
+}
+
+#[test]
+fn wiki_docs_parses() {
+    let wiki_dir = PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("../wiki");
+
+    let code_blocks = fs::read_dir(wiki_dir)
+        .unwrap()
+        .filter_map(|entry| entry.ok())
+        .filter(|entry| entry.file_type().is_ok_and(|ft| ft.is_file()))
+        .filter(|file| {
+            file.path()
+                .extension()
+                .map(|ext| ext == "md")
+                .unwrap_or(false)
+        })
+        .flat_map(|file| {
+            let file_contents = fs::read_to_string(file.path()).unwrap();
+            let file_path = file.path();
+            let filename = file_path.to_str().unwrap();
+            extract_kdl_from_file(&file_contents, filename)
+        });
+
+    let mut errors = vec![];
+
+    for KdlCodeBlock {
+        code,
+        line_number,
+        filename,
+        must_fail,
+    } in code_blocks
+    {
+        if let Err(error) = niri_config::Config::parse(&filename, &code) {
+            if !must_fail {
+                errors.push(format!(
+                    "Error parsing wiki KDL code block at {}:{}: {:?}",
+                    filename,
+                    line_number,
+                    miette::Report::new(error)
+                ));
+            }
+        } else if must_fail {
+            errors.push(format!(
+                "Expected error parsing wiki KDL code block at {}:{}",
+                filename, line_number
+            ));
+        }
+    }
+
+    if !errors.is_empty() {
+        panic!(
+            "Errors parsing {} wiki KDL code blocks:\n{}",
+            errors.len(),
+            errors.join("\n")
+        );
+    }
+}

niri-ipc/Cargo.toml

@@ -0,0 +1,22 @@
+[package]
+name = "niri-ipc"
+version.workspace = true
+authors.workspace = true
+license.workspace = true
+edition.workspace = true
+repository.workspace = true
+
+description = "Types and helpers for interfacing with the niri Wayland compositor."
+keywords = ["wayland"]
+categories = ["api-bindings", "os"]
+readme = "README.md"
+
+[dependencies]
+clap = { workspace = true, optional = true }
+schemars = { version = "0.8.21", optional = true }
+serde.workspace = true
+serde_json.workspace = true
+
+[features]
+clap = ["dep:clap"]
+json-schema = ["dep:schemars"]

niri-ipc/README.md

@@ -0,0 +1,16 @@
+# niri-ipc
+
+Types and helpers for interfacing with the [niri](https://github.com/YaLTeR/niri) Wayland compositor.
+
+## Backwards compatibility
+
+This crate follows the niri version.
+It is **not** API-stable in terms of the Rust semver.
+In particular, expect new struct fields and enum variants to be added in patch version bumps.
+
+Use an exact version requirement to avoid breaking changes:
+
+```toml
+[dependencies]
+niri-ipc = "=25.1.0"
+```

niri-ipc/src/socket.rs

@@ -0,0 +1,77 @@
+//! Helper for blocking communication over the niri socket.
+
+use std::env;
+use std::io::{self, BufRead, BufReader, Write};
+use std::net::Shutdown;
+use std::os::unix::net::UnixStream;
+use std::path::Path;
+
+use crate::{Event, Reply, Request};
+
+/// Name of the environment variable containing the niri IPC socket path.
+pub const SOCKET_PATH_ENV: &str = "NIRI_SOCKET";
+
+/// Helper for blocking communication over the niri socket.
+///
+/// This struct is used to communicate with the niri IPC server. It handles the socket connection
+/// and serialization/deserialization of messages.
+pub struct Socket {
+    stream: UnixStream,
+}
+
+impl Socket {
+    /// Connects to the default niri IPC socket.
+    ///
+    /// This is equivalent to calling [`Self::connect_to`] with the path taken from the
+    /// [`SOCKET_PATH_ENV`] environment variable.
+    pub fn connect() -> io::Result<Self> {
+        let socket_path = env::var_os(SOCKET_PATH_ENV).ok_or_else(|| {
+            io::Error::new(
+                io::ErrorKind::NotFound,
+                format!("{SOCKET_PATH_ENV} is not set, are you running this within niri?"),
+            )
+        })?;
+        Self::connect_to(socket_path)
+    }
+
+    /// Connects to the niri IPC socket at the given path.
+    pub fn connect_to(path: impl AsRef<Path>) -> io::Result<Self> {
+        let stream = UnixStream::connect(path.as_ref())?;
+        Ok(Self { stream })
+    }
+
+    /// Sends a request to niri and returns the response.
+    ///
+    /// Return values:
+    ///
+    /// * `Ok(Ok(response))`: successful [`Response`](crate::Response) from niri
+    /// * `Ok(Err(message))`: error message from niri
+    /// * `Err(error)`: error communicating with niri
+    ///
+    /// This method also returns a blocking function that you can call to keep reading [`Event`]s
+    /// after requesting an [`EventStream`][Request::EventStream]. This function is not useful
+    /// otherwise.
+    pub fn send(self, request: Request) -> io::Result<(Reply, impl FnMut() -> io::Result<Event>)> {
+        let Self { mut stream } = self;
+
+        let mut buf = serde_json::to_string(&request).unwrap();
+        stream.write_all(buf.as_bytes())?;
+        stream.shutdown(Shutdown::Write)?;
+
+        let mut reader = BufReader::new(stream);
+
+        buf.clear();
+        reader.read_line(&mut buf)?;
+
+        let reply = serde_json::from_str(&buf)?;
+
+        let events = move || {
+            buf.clear();
+            reader.read_line(&mut buf)?;
+            let event = serde_json::from_str(&buf)?;
+            Ok(event)
+        };
+
+        Ok((reply, events))
+    }
+}

niri-ipc/src/state.rs

@@ -0,0 +1,194 @@
+//! Helpers for keeping track of the event stream state.
+//!
+//! 1. Create an [`EventStreamState`] using `Default::default()`, or any individual state part if
+//!    you only care about part of the state.
+//! 2. Connect to the niri socket and request an event stream.
+//! 3. Pass every [`Event`] to [`EventStreamStatePart::apply`] on your state.
+//! 4. Read the fields of the state as needed.
+
+use std::collections::hash_map::Entry;
+use std::collections::HashMap;
+
+use crate::{Event, KeyboardLayouts, Window, Workspace};
+
+/// Part of the state communicated via the event stream.
+pub trait EventStreamStatePart {
+    /// Returns a sequence of events that replicates this state from default initialization.
+    fn replicate(&self) -> Vec<Event>;
+
+    /// Applies the event to this state.
+    ///
+    /// Returns `None` after applying the event, and `Some(event)` if the event is ignored by this
+    /// part of the state.
+    fn apply(&mut self, event: Event) -> Option<Event>;
+}
+
+/// The full state communicated over the event stream.
+///
+/// Different parts of the state are not guaranteed to be consistent across every single event
+/// sent by niri. For example, you may receive the first [`Event::WindowOpenedOrChanged`] for a
+/// just-opened window *after* an [`Event::WorkspaceActiveWindowChanged`] for that window. Between
+/// these two events, the workspace active window id refers to a window that does not yet exist in
+/// the windows state part.
+#[derive(Debug, Default)]
+pub struct EventStreamState {
+    /// State of workspaces.
+    pub workspaces: WorkspacesState,
+
+    /// State of workspaces.
+    pub windows: WindowsState,
+
+    /// State of the keyboard layouts.
+    pub keyboard_layouts: KeyboardLayoutsState,
+}
+
+/// The workspaces state communicated over the event stream.
+#[derive(Debug, Default)]
+pub struct WorkspacesState {
+    /// Map from a workspace id to the workspace.
+    pub workspaces: HashMap<u64, Workspace>,
+}
+
+/// The windows state communicated over the event stream.
+#[derive(Debug, Default)]
+pub struct WindowsState {
+    /// Map from a window id to the window.
+    pub windows: HashMap<u64, Window>,
+}
+
+/// The keyboard layout state communicated over the event stream.
+#[derive(Debug, Default)]
+pub struct KeyboardLayoutsState {
+    /// Configured keyboard layouts.
+    pub keyboard_layouts: Option<KeyboardLayouts>,
+}
+
+impl EventStreamStatePart for EventStreamState {
+    fn replicate(&self) -> Vec<Event> {
+        let mut events = Vec::new();
+        events.extend(self.workspaces.replicate());
+        events.extend(self.windows.replicate());
+        events.extend(self.keyboard_layouts.replicate());
+        events
+    }
+
+    fn apply(&mut self, event: Event) -> Option<Event> {
+        let event = self.workspaces.apply(event)?;
+        let event = self.windows.apply(event)?;
+        let event = self.keyboard_layouts.apply(event)?;
+        Some(event)
+    }
+}
+
+impl EventStreamStatePart for WorkspacesState {
+    fn replicate(&self) -> Vec<Event> {
+        let workspaces = self.workspaces.values().cloned().collect();
+        vec![Event::WorkspacesChanged { workspaces }]
+    }
+
+    fn apply(&mut self, event: Event) -> Option<Event> {
+        match event {
+            Event::WorkspacesChanged { workspaces } => {
+                self.workspaces = workspaces.into_iter().map(|ws| (ws.id, ws)).collect();
+            }
+            Event::WorkspaceActivated { id, focused } => {
+                let ws = self.workspaces.get(&id);
+                let ws = ws.expect("activated workspace was missing from the map");
+                let output = ws.output.clone();
+
+                for ws in self.workspaces.values_mut() {
+                    let got_activated = ws.id == id;
+                    if ws.output == output {
+                        ws.is_active = got_activated;
+                    }
+
+                    if focused {
+                        ws.is_focused = got_activated;
+                    }
+                }
+            }
+            Event::WorkspaceActiveWindowChanged {
+                workspace_id,
+                active_window_id,
+            } => {
+                let ws = self.workspaces.get_mut(&workspace_id);
+                let ws = ws.expect("changed workspace was missing from the map");
+                ws.active_window_id = active_window_id;
+            }
+            event => return Some(event),
+        }
+        None
+    }
+}
+
+impl EventStreamStatePart for WindowsState {
+    fn replicate(&self) -> Vec<Event> {
+        let windows = self.windows.values().cloned().collect();
+        vec![Event::WindowsChanged { windows }]
+    }
+
+    fn apply(&mut self, event: Event) -> Option<Event> {
+        match event {
+            Event::WindowsChanged { windows } => {
+                self.windows = windows.into_iter().map(|win| (win.id, win)).collect();
+            }
+            Event::WindowOpenedOrChanged { window } => {
+                let (id, is_focused) = match self.windows.entry(window.id) {
+                    Entry::Occupied(mut entry) => {
+                        let entry = entry.get_mut();
+                        *entry = window;
+                        (entry.id, entry.is_focused)
+                    }
+                    Entry::Vacant(entry) => {
+                        let entry = entry.insert(window);
+                        (entry.id, entry.is_focused)
+                    }
+                };
+
+                if is_focused {
+                    for win in self.windows.values_mut() {
+                        if win.id != id {
+                            win.is_focused = false;
+                        }
+                    }
+                }
+            }
+            Event::WindowClosed { id } => {
+                let win = self.windows.remove(&id);
+                win.expect("closed window was missing from the map");
+            }
+            Event::WindowFocusChanged { id } => {
+                for win in self.windows.values_mut() {
+                    win.is_focused = Some(win.id) == id;
+                }
+            }
+            event => return Some(event),
+        }
+        None
+    }
+}
+
+impl EventStreamStatePart for KeyboardLayoutsState {
+    fn replicate(&self) -> Vec<Event> {
+        if let Some(keyboard_layouts) = self.keyboard_layouts.clone() {
+            vec![Event::KeyboardLayoutsChanged { keyboard_layouts }]
+        } else {
+            vec![]
+        }
+    }
+
+    fn apply(&mut self, event: Event) -> Option<Event> {
+        match event {
+            Event::KeyboardLayoutsChanged { keyboard_layouts } => {
+                self.keyboard_layouts = Some(keyboard_layouts);
+            }
+            Event::KeyboardLayoutSwitched { idx } => {
+                let kb = self.keyboard_layouts.as_mut();
+                let kb = kb.expect("keyboard layouts must be set before a layout can be switched");
+                kb.current_idx = idx;
+            }
+            event => return Some(event),
+        }
+        None
+    }
+}

niri-visual-tests/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "niri-visual-tests"
+version.workspace = true
+description.workspace = true
+authors.workspace = true
+license.workspace = true
+edition.workspace = true
+repository.workspace = true
+
+[dependencies]
+adw = { version = "0.7.1", package = "libadwaita", features = ["v1_4"] }
+anyhow.workspace = true
+gtk = { version = "0.9.5", package = "gtk4", features = ["v4_12"] }
+niri = { version = "25.1.0", path = ".." }
+niri-config = { version = "25.1.0", path = "../niri-config" }
+smithay.workspace = true
+tracing.workspace = true
+tracing-subscriber.workspace = true

niri-visual-tests/README.md

@@ -0,0 +1,14 @@
+# niri-visual-tests
+
+> [!NOTE]
+>
+> This is a development-only app, you shouldn't package it.
+
+This app contains a number of hard-coded test scenarios for visual inspection.
+It uses the real niri layout and rendering code, but with mock windows instead of Wayland clients.
+The idea is to go through the test scenarios and check that everything *looks* right.
+
+## Running
+
+You will need recent GTK and libadwaita.
+Then, `cargo run`.

niri-visual-tests/resources/style.css

@@ -0,0 +1,3 @@
+.anim-control-bar {
+    padding: 12px;
+}

niri-visual-tests/src/cases/gradient_angle.rs

@@ -0,0 +1,72 @@
+use std::f32::consts::{FRAC_PI_2, PI};
+use std::time::Duration;
+
+use niri::render_helpers::border::BorderRenderElement;
+use niri_config::{Color, CornerRadius, GradientInterpolation};
+use smithay::backend::renderer::element::RenderElement;
+use smithay::backend::renderer::gles::GlesRenderer;
+use smithay::utils::{Physical, Point, Rectangle, Size};
+
+use super::{Args, TestCase};
+
+pub struct GradientAngle {
+    angle: f32,
+    prev_time: Duration,
+}
+
+impl GradientAngle {
+    pub fn new(_args: Args) -> Self {
+        Self {
+            angle: 0.,
+            prev_time: Duration::ZERO,
+        }
+    }
+}
+
+impl TestCase for GradientAngle {
+    fn are_animations_ongoing(&self) -> bool {
+        true
+    }
+
+    fn advance_animations(&mut self, current_time: Duration) {
+        let delta = if self.prev_time.is_zero() {
+            Duration::ZERO
+        } else {
+            current_time.saturating_sub(self.prev_time)
+        };
+        self.prev_time = current_time;
+
+        self.angle += delta.as_secs_f32() * PI;
+
+        if self.angle >= PI * 2. {
+            self.angle -= PI * 2.
+        }
+    }
+
+    fn render(
+        &mut self,
+        _renderer: &mut GlesRenderer,
+        size: Size<i32, Physical>,
+    ) -> Vec<Box<dyn RenderElement<GlesRenderer>>> {
+        let (a, b) = (size.w / 4, size.h / 4);
+        let size = (size.w - a * 2, size.h - b * 2);
+        let area = Rectangle::new(Point::from((a, b)), Size::from(size)).to_f64();
+
+        [BorderRenderElement::new(
+            area.size,
+            Rectangle::from_size(area.size),
+            GradientInterpolation::default(),
+            Color::new_unpremul(1., 0., 0., 1.),
+            Color::new_unpremul(0., 1., 0., 1.),
+            self.angle - FRAC_PI_2,
+            Rectangle::from_size(area.size),
+            0.,
+            CornerRadius::default(),
+            1.,
+        )
+        .with_location(area.loc)]
+        .into_iter()
+        .map(|elem| Box::new(elem) as _)
+        .collect()
+    }
+}

niri-visual-tests/src/cases/gradient_area.rs

@@ -0,0 +1,114 @@
+use std::f32::consts::{FRAC_PI_4, PI};
+use std::time::Duration;
+
+use niri::layout::focus_ring::FocusRing;
+use niri::render_helpers::border::BorderRenderElement;
+use niri_config::{Color, CornerRadius, FloatOrInt, GradientInterpolation};
+use smithay::backend::renderer::element::RenderElement;
+use smithay::backend::renderer::gles::GlesRenderer;
+use smithay::utils::{Physical, Point, Rectangle, Size};
+
+use super::{Args, TestCase};
+
+pub struct GradientArea {
+    progress: f32,
+    border: FocusRing,
+    prev_time: Duration,
+}
+
+impl GradientArea {
+    pub fn new(_args: Args) -> Self {
+        let border = FocusRing::new(niri_config::FocusRing {
+            off: false,
+            width: FloatOrInt(1.),
+            active_color: Color::from_rgba8_unpremul(255, 255, 255, 128),
+            inactive_color: Color::default(),
+            active_gradient: None,
+            inactive_gradient: None,
+        });
+
+        Self {
+            progress: 0.,
+            border,
+            prev_time: Duration::ZERO,
+        }
+    }
+}
+
+impl TestCase for GradientArea {
+    fn are_animations_ongoing(&self) -> bool {
+        true
+    }
+
+    fn advance_animations(&mut self, current_time: Duration) {
+        let delta = if self.prev_time.is_zero() {
+            Duration::ZERO
+        } else {
+            current_time.saturating_sub(self.prev_time)
+        };
+        self.prev_time = current_time;
+
+        self.progress += delta.as_secs_f32() * PI;
+
+        if self.progress >= PI * 2. {
+            self.progress -= PI * 2.
+        }
+    }
+
+    fn render(
+        &mut self,
+        renderer: &mut GlesRenderer,
+        size: Size<i32, Physical>,
+    ) -> Vec<Box<dyn RenderElement<GlesRenderer>>> {
+        let mut rv = Vec::new();
+
+        let f = (self.progress.sin() + 1.) / 2.;
+
+        let (a, b) = (size.w / 4, size.h / 4);
+        let rect_size = Size::from((size.w - a * 2, size.h - b * 2));
+        let area = Rectangle::new(Point::from((a, b)), rect_size).to_f64();
+
+        let g_size = Size::from((
+            (size.w as f32 / 8. + size.w as f32 / 8. * 7. * f).round() as i32,
+            (size.h as f32 / 8. + size.h as f32 / 8. * 7. * f).round() as i32,
+        ));
+        let g_loc = Point::from(((size.w - g_size.w) / 2, (size.h - g_size.h) / 2)).to_f64();
+        let g_size = g_size.to_f64();
+        let mut g_area = Rectangle::new(g_loc, g_size);
+        g_area.loc -= area.loc;
+
+        self.border.update_render_elements(
+            g_size,
+            true,
+            true,
+            Rectangle::default(),
+            CornerRadius::default(),
+            1.,
+        );
+        rv.extend(
+            self.border
+                .render(renderer, g_loc)
+                .map(|elem| Box::new(elem) as _),
+        );
+
+        rv.extend(
+            [BorderRenderElement::new(
+                area.size,
+                g_area,
+                GradientInterpolation::default(),
+                Color::new_unpremul(1., 0., 0., 1.),
+                Color::new_unpremul(0., 1., 0., 1.),
+                FRAC_PI_4,
+                Rectangle::from_size(rect_size).to_f64(),
+                0.,
+                CornerRadius::default(),
+                1.,
+            )
+            .with_location(area.loc)]
+            .into_iter()
+            .map(|elem| Box::new(elem) as _),
+        );
+
+        rv
+    }
+}

niri-visual-tests/src/cases/gradient_oklab.rs

@@ -0,0 +1,53 @@
+use niri::render_helpers::border::BorderRenderElement;
+use niri_config::{
+    Color, CornerRadius, GradientColorSpace, GradientInterpolation, HueInterpolation,
+};
+use smithay::backend::renderer::element::RenderElement;
+use smithay::backend::renderer::gles::GlesRenderer;
+use smithay::utils::{Physical, Point, Rectangle, Size};
+
+use super::{Args, TestCase};
+
+pub struct GradientOklab {
+    gradient_format: GradientInterpolation,
+}
+
+impl GradientOklab {
+    pub fn new(_args: Args) -> Self {
+        Self {
+            gradient_format: GradientInterpolation {
+                color_space: GradientColorSpace::Oklab,
+                hue_interpolation: HueInterpolation::Shorter,
+            },
+        }
+    }
+}
+
+impl TestCase for GradientOklab {
+    fn render(
+        &mut self,
+        _renderer: &mut GlesRenderer,
+        size: Size<i32, Physical>,
+    ) -> Vec<Box<dyn RenderElement<GlesRenderer>>> {
+        let (a, b) = (size.w / 6, size.h / 3);
+        let size = (size.w - a * 2, size.h - b * 2);
+        let area = Rectangle::new(Point::from((a, b)), Size::from(size)).to_f64();
+
+        [BorderRenderElement::new(
+            area.size,
+            Rectangle::from_size(area.size),
+            self.gradient_format,
+            Color::new_unpremul(1., 0., 0., 1.),
+            Color::new_unpremul(0., 1., 0., 1.),
+            0.,
+            Rectangle::from_size(area.size),
+            0.,
+            CornerRadius::default(),
+            1.,
+        )
+        .with_location(area.loc)]
+        .into_iter()
+        .map(|elem| Box::new(elem) as _)
+        .collect()
+    }
+}

niri-visual-tests/src/cases/gradient_oklab_alpha.rs

@@ -0,0 +1,51 @@
+use niri::render_helpers::border::BorderRenderElement;
+use niri_config::{Color, CornerRadius, GradientColorSpace, GradientInterpolation};
+use smithay::backend::renderer::element::RenderElement;
+use smithay::backend::renderer::gles::GlesRenderer;
+use smithay::utils::{Physical, Point, Rectangle, Size};
+
+use super::{Args, TestCase};
+
+pub struct GradientOklabAlpha {
+    gradient_format: GradientInterpolation,
+}
+
+impl GradientOklabAlpha {
+    pub fn new(_args: Args) -> Self {
+        Self {
+            gradient_format: GradientInterpolation {
+                color_space: GradientColorSpace::Oklab,
+                hue_interpolation: Default::default(),
+            },
+        }
+    }
+}
+
+impl TestCase for GradientOklabAlpha {
+    fn render(
+        &mut self,
+        _renderer: &mut GlesRenderer,
+        size: Size<i32, Physical>,
+    ) -> Vec<Box<dyn RenderElement<GlesRenderer>>> {
+        let (a, b) = (size.w / 6, size.h / 3);
+        let size = (size.w - a * 2, size.h - b * 2);
+        let area = Rectangle::new(Point::from((a, b)), Size::from(size)).to_f64();
+
+        [BorderRenderElement::new(
+            area.size,
+            Rectangle::from_size(area.size),
+            self.gradient_format,
+            Color::new_unpremul(1., 0., 0., 1.),
+            Color::new_unpremul(0., 1., 0., 0.),
+            0.,
+            Rectangle::from_size(area.size),
+            0.,
+            CornerRadius::default(),
+            1.,
+        )
+        .with_location(area.loc)]
+        .into_iter()
+        .map(|elem| Box::new(elem) as _)
+        .collect()
+    }
+}

niri-visual-tests/src/cases/gradient_oklch_alpha.rs

@@ -0,0 +1,53 @@
+use niri::render_helpers::border::BorderRenderElement;
+use niri_config::{
+    Color, CornerRadius, GradientColorSpace, GradientInterpolation, HueInterpolation,
+};
+use smithay::backend::renderer::element::RenderElement;
+use smithay::backend::renderer::gles::GlesRenderer;
+use smithay::utils::{Physical, Point, Rectangle, Size};
+
+use super::{Args, TestCase};
+
+pub struct GradientOklchAlpha {
+    gradient_format: GradientInterpolation,
+}
+
+impl GradientOklchAlpha {
+    pub fn new(_args: Args) -> Self {
+        Self {
+            gradient_format: GradientInterpolation {
+                color_space: GradientColorSpace::Oklch,
+                hue_interpolation: HueInterpolation::Longer,
+            },
+        }
+    }
+}
+
+impl TestCase for GradientOklchAlpha {
+    fn render(
+        &mut self,
+        _renderer: &mut GlesRenderer,
+        size: Size<i32, Physical>,
+    ) -> Vec<Box<dyn RenderElement<GlesRenderer>>> {
+        let (a, b) = (size.w / 6, size.h / 3);
+        let size = (size.w - a * 2, size.h - b * 2);
+        let area = Rectangle::new(Point::from((a, b)), Size::from(size)).to_f64();
+
+        [BorderRenderElement::new(
+            area.size,
+            Rectangle::from_size(area.size),
+            self.gradient_format,
+            Color::new_unpremul(1., 0., 0., 1.),
+            Color::new_unpremul(0., 1., 0., 0.),
+            0.,
+            Rectangle::from_size(area.size),
+            0.,
+            CornerRadius::default(),
+            1.,
+        )
+        .with_location(area.loc)]
+        .into_iter()
+        .map(|elem| Box::new(elem) as _)
+        .collect()
+    }
+}

niri-visual-tests/src/cases/gradient_oklch_decreasing.rs

@@ -0,0 +1,53 @@
+use niri::render_helpers::border::BorderRenderElement;
+use niri_config::{
+    Color, CornerRadius, GradientColorSpace, GradientInterpolation, HueInterpolation,
+};
+use smithay::backend::renderer::element::RenderElement;
+use smithay::backend::renderer::gles::GlesRenderer;
+use smithay::utils::{Physical, Point, Rectangle, Size};
+
+use super::{Args, TestCase};
+
+pub struct GradientOklchDecreasing {
+    gradient_format: GradientInterpolation,
+}
+
+impl GradientOklchDecreasing {
+    pub fn new(_args: Args) -> Self {
+        Self {
+            gradient_format: GradientInterpolation {
+                color_space: GradientColorSpace::Oklch,
+                hue_interpolation: HueInterpolation::Decreasing,
+            },
+        }
+    }
+}
+
+impl TestCase for GradientOklchDecreasing {
+    fn render(
+        &mut self,
+        _renderer: &mut GlesRenderer,
+        size: Size<i32, Physical>,
+    ) -> Vec<Box<dyn RenderElement<GlesRenderer>>> {
+        let (a, b) = (size.w / 6, size.h / 3);
+        let size = (size.w - a * 2, size.h - b * 2);
+        let area = Rectangle::new(Point::from((a, b)), Size::from(size)).to_f64();
+
+        [BorderRenderElement::new(
+            area.size,
+            Rectangle::from_size(area.size),
+            self.gradient_format,
+            Color::new_unpremul(1., 0., 0., 1.),
+            Color::new_unpremul(0., 1., 0., 1.),
+            0.,
+            Rectangle::from_size(area.size),
+            0.,
+            CornerRadius::default(),
+            1.,
+        )
+        .with_location(area.loc)]
+        .into_iter()
+        .map(|elem| Box::new(elem) as _)
+        .collect()
+    }
+}

niri-visual-tests/src/cases/gradient_oklch_increasing.rs

@@ -0,0 +1,53 @@
+use niri::render_helpers::border::BorderRenderElement;
+use niri_config::{
+    Color, CornerRadius, GradientColorSpace, GradientInterpolation, HueInterpolation,
+};
+use smithay::backend::renderer::element::RenderElement;
+use smithay::backend::renderer::gles::GlesRenderer;
+use smithay::utils::{Physical, Point, Rectangle, Size};
+
+use super::{Args, TestCase};
+
+pub struct GradientOklchIncreasing {
+    gradient_format: GradientInterpolation,
+}
+
+impl GradientOklchIncreasing {
+    pub fn new(_args: Args) -> Self {
+        Self {
+            gradient_format: GradientInterpolation {
+                color_space: GradientColorSpace::Oklch,
+                hue_interpolation: HueInterpolation::Increasing,
+            },
+        }
+    }
+}
+
+impl TestCase for GradientOklchIncreasing {
+    fn render(
+        &mut self,
+        _renderer: &mut GlesRenderer,
+        size: Size<i32, Physical>,
+    ) -> Vec<Box<dyn RenderElement<GlesRenderer>>> {
+        let (a, b) = (size.w / 6, size.h / 3);
+        let size = (size.w - a * 2, size.h - b * 2);
+        let area = Rectangle::new(Point::from((a, b)), Size::from(size)).to_f64();
+
+        [BorderRenderElement::new(
+            area.size,
+            Rectangle::from_size(area.size),
+            self.gradient_format,
+            Color::new_unpremul(1., 0., 0., 1.),
+            Color::new_unpremul(0., 1., 0., 1.),
+            0.,
+            Rectangle::from_size(area.size),
+            0.,
+            CornerRadius::default(),
+            1.,
+        )
+        .with_location(area.loc)]
+        .into_iter()
+        .map(|elem| Box::new(elem) as _)
+        .collect()
+    }
+}

niri-visual-tests/src/cases/gradient_oklch_longer.rs

@@ -0,0 +1,53 @@
+use niri::render_helpers::border::BorderRenderElement;
+use niri_config::{
+    Color, CornerRadius, GradientColorSpace, GradientInterpolation, HueInterpolation,
+};
+use smithay::backend::renderer::element::RenderElement;
+use smithay::backend::renderer::gles::GlesRenderer;
+use smithay::utils::{Physical, Point, Rectangle, Size};
+
+use super::{Args, TestCase};
+
+pub struct GradientOklchLonger {
+    gradient_format: GradientInterpolation,
+}
+
+impl GradientOklchLonger {
+    pub fn new(_args: Args) -> Self {
+        Self {
+            gradient_format: GradientInterpolation {
+                color_space: GradientColorSpace::Oklch,
+                hue_interpolation: HueInterpolation::Longer,
+            },
+        }
+    }
+}
+
+impl TestCase for GradientOklchLonger {
+    fn render(
+        &mut self,
+        _renderer: &mut GlesRenderer,
+        size: Size<i32, Physical>,
+    ) -> Vec<Box<dyn RenderElement<GlesRenderer>>> {
+        let (a, b) = (size.w / 6, size.h / 3);
+        let size = (size.w - a * 2, size.h - b * 2);
+        let area = Rectangle::new(Point::from((a, b)), Size::from(size)).to_f64();
+
+        [BorderRenderElement::new(
+            area.size,
+            Rectangle::from_size(area.size),
+            self.gradient_format,
+            Color::new_unpremul(1., 0., 0., 1.),
+            Color::new_unpremul(0., 1., 0., 1.),
+            0.,
+            Rectangle::from_size(area.size),
+            0.,
+            CornerRadius::default(),
+            1.,
+        )
+        .with_location(area.loc)]
+        .into_iter()
+        .map(|elem| Box::new(elem) as _)
+        .collect()
+    }
+}

niri-visual-tests/src/cases/gradient_oklch_shorter.rs

@@ -0,0 +1,53 @@
+use niri::render_helpers::border::BorderRenderElement;
+use niri_config::{
+    Color, CornerRadius, GradientColorSpace, GradientInterpolation, HueInterpolation,
+};
+use smithay::backend::renderer::element::RenderElement;
+use smithay::backend::renderer::gles::GlesRenderer;
+use smithay::utils::{Physical, Point, Rectangle, Size};
+
+use super::{Args, TestCase};
+
+pub struct GradientOklchShorter {
+    gradient_format: GradientInterpolation,
+}
+
+impl GradientOklchShorter {
+    pub fn new(_args: Args) -> Self {
+        Self {
+            gradient_format: GradientInterpolation {
+                color_space: GradientColorSpace::Oklch,
+                hue_interpolation: HueInterpolation::Shorter,
+            },
+        }
+    }
+}
+
+impl TestCase for GradientOklchShorter {
+    fn render(
+        &mut self,
+        _renderer: &mut GlesRenderer,
+        size: Size<i32, Physical>,
+    ) -> Vec<Box<dyn RenderElement<GlesRenderer>>> {
+        let (a, b) = (size.w / 6, size.h / 3);
+        let size = (size.w - a * 2, size.h - b * 2);
+        let area = Rectangle::new(Point::from((a, b)), Size::from(size)).to_f64();
+
+        [BorderRenderElement::new(
+            area.size,
+            Rectangle::from_size(area.size),
+            self.gradient_format,
+            Color::new_unpremul(1., 0., 0., 1.),
+            Color::new_unpremul(0., 1., 0., 1.),
+            0.,
+            Rectangle::from_size(area.size),
+            0.,
+            CornerRadius::default(),
+            1.,
+        )
+        .with_location(area.loc)]
+        .into_iter()
+        .map(|elem| Box::new(elem) as _)
+        .collect()
+    }
+}

niri-visual-tests/src/cases/gradient_srgb.rs

@@ -0,0 +1,53 @@
+use niri::render_helpers::border::BorderRenderElement;
+use niri_config::{
+    Color, CornerRadius, GradientColorSpace, GradientInterpolation, HueInterpolation,
+};
+use smithay::backend::renderer::element::RenderElement;
+use smithay::backend::renderer::gles::GlesRenderer;
+use smithay::utils::{Physical, Point, Rectangle, Size};
+
+use super::{Args, TestCase};
+
+pub struct GradientSrgb {
+    gradient_format: GradientInterpolation,
+}
+
+impl GradientSrgb {
+    pub fn new(_args: Args) -> Self {
+        Self {
+            gradient_format: GradientInterpolation {
+                color_space: GradientColorSpace::Srgb,
+                hue_interpolation: HueInterpolation::Shorter,
+            },
+        }
+    }
+}
+
+impl TestCase for GradientSrgb {
+    fn render(
+        &mut self,
+        _renderer: &mut GlesRenderer,
+        size: Size<i32, Physical>,
+    ) -> Vec<Box<dyn RenderElement<GlesRenderer>>> {
+        let (a, b) = (size.w / 6, size.h / 3);
+        let size = (size.w - a * 2, size.h - b * 2);
+        let area = Rectangle::new(Point::from((a, b)), Size::from(size)).to_f64();
+
+        [BorderRenderElement::new(
+            area.size,
+            Rectangle::from_size(area.size),
+            self.gradient_format,
+            Color::new_unpremul(1., 0., 0., 1.),
+            Color::new_unpremul(0., 1., 0., 1.),
+            0.,
+            Rectangle::from_size(area.size),
+            0.,
+            CornerRadius::default(),
+            1.,
+        )
+        .with_location(area.loc)]
+        .into_iter()
+        .map(|elem| Box::new(elem) as _)
+        .collect()
+    }
+}

niri-visual-tests/src/cases/gradient_srgb_alpha.rs

@@ -0,0 +1,51 @@
+use niri::render_helpers::border::BorderRenderElement;
+use niri_config::{Color, CornerRadius, GradientColorSpace, GradientInterpolation};
+use smithay::backend::renderer::element::RenderElement;
+use smithay::backend::renderer::gles::GlesRenderer;
+use smithay::utils::{Physical, Point, Rectangle, Size};
+
+use super::{Args, TestCase};
+
+pub struct GradientSrgbAlpha {
+    gradient_format: GradientInterpolation,
+}
+
+impl GradientSrgbAlpha {
+    pub fn new(_args: Args) -> Self {
+        Self {
+            gradient_format: GradientInterpolation {
+                color_space: GradientColorSpace::Srgb,
+                hue_interpolation: Default::default(),
+            },
+        }
+    }
+}
+
+impl TestCase for GradientSrgbAlpha {
+    fn render(
+        &mut self,
+        _renderer: &mut GlesRenderer,
+        size: Size<i32, Physical>,
+    ) -> Vec<Box<dyn RenderElement<GlesRenderer>>> {
+        let (a, b) = (size.w / 6, size.h / 3);
+        let size = (size.w - a * 2, size.h - b * 2);
+        let area = Rectangle::new(Point::from((a, b)), Size::from(size)).to_f64();
+
+        [BorderRenderElement::new(
+            area.size,
+            Rectangle::from_size(area.size),
+            self.gradient_format,
+            Color::new_unpremul(1., 0., 0., 1.),
+            Color::new_unpremul(0., 1., 0., 0.),
+            0.,
+            Rectangle::from_size(area.size),
+            0.,
+            CornerRadius::default(),
+            1.,
+        )
+        .with_location(area.loc)]
+        .into_iter()
+        .map(|elem| Box::new(elem) as _)
+        .collect()
+    }
+}

niri-visual-tests/src/cases/gradient_srgblinear.rs

@@ -0,0 +1,53 @@
+use niri::render_helpers::border::BorderRenderElement;
+use niri_config::{
+    Color, CornerRadius, GradientColorSpace, GradientInterpolation, HueInterpolation,
+};
+use smithay::backend::renderer::element::RenderElement;
+use smithay::backend::renderer::gles::GlesRenderer;
+use smithay::utils::{Physical, Point, Rectangle, Size};
+
+use super::{Args, TestCase};
+
+pub struct GradientSrgbLinear {
+    gradient_format: GradientInterpolation,
+}
+
+impl GradientSrgbLinear {
+    pub fn new(_args: Args) -> Self {
+        Self {
+            gradient_format: GradientInterpolation {
+                color_space: GradientColorSpace::SrgbLinear,
+                hue_interpolation: HueInterpolation::Shorter,
+            },
+        }
+    }
+}
+
+impl TestCase for GradientSrgbLinear {
+    fn render(
+        &mut self,
+        _renderer: &mut GlesRenderer,
+        size: Size<i32, Physical>,
+    ) -> Vec<Box<dyn RenderElement<GlesRenderer>>> {
+        let (a, b) = (size.w / 6, size.h / 3);
+        let size = (size.w - a * 2, size.h - b * 2);
+        let area = Rectangle::new(Point::from((a, b)), Size::from(size)).to_f64();
+
+        [BorderRenderElement::new(
+            area.size,
+            Rectangle::from_size(area.size),
+            self.gradient_format,
+            Color::new_unpremul(1., 0., 0., 1.),
+            Color::new_unpremul(0., 1., 0., 1.),
+            0.,
+            Rectangle::from_size(area.size),
+            0.,
+            CornerRadius::default(),
+            1.,
+        )
+        .with_location(area.loc)]
+        .into_iter()
+        .map(|elem| Box::new(elem) as _)
+        .collect()
+    }
+}

niri-visual-tests/src/cases/gradient_srgblinear_alpha.rs

@@ -0,0 +1,51 @@
+use niri::render_helpers::border::BorderRenderElement;
+use niri_config::{Color, CornerRadius, GradientColorSpace, GradientInterpolation};
+use smithay::backend::renderer::element::RenderElement;
+use smithay::backend::renderer::gles::GlesRenderer;
+use smithay::utils::{Physical, Point, Rectangle, Size};
+
+use super::{Args, TestCase};
+
+pub struct GradientSrgbLinearAlpha {
+    gradient_format: GradientInterpolation,
+}
+
+impl GradientSrgbLinearAlpha {
+    pub fn new(_args: Args) -> Self {
+        Self {
+            gradient_format: GradientInterpolation {
+                color_space: GradientColorSpace::SrgbLinear,
+                hue_interpolation: Default::default(),
+            },
+        }
+    }
+}
+
+impl TestCase for GradientSrgbLinearAlpha {
+    fn render(
+        &mut self,
+        _renderer: &mut GlesRenderer,
+        size: Size<i32, Physical>,
+    ) -> Vec<Box<dyn RenderElement<GlesRenderer>>> {
+        let (a, b) = (size.w / 6, size.h / 3);
+        let size = (size.w - a * 2, size.h - b * 2);
+        let area = Rectangle::new(Point::from((a, b)), Size::from(size)).to_f64();
+
+        [BorderRenderElement::new(
+            area.size,
+            Rectangle::from_size(area.size),
+            self.gradient_format,
+            Color::new_unpremul(1., 0., 0., 1.),
+            Color::new_unpremul(0., 1., 0., 0.),
+            0.,
+            Rectangle::from_size(area.size),
+            0.,
+            CornerRadius::default(),
+            1.,
+        )
+        .with_location(area.loc)]
+        .into_iter()
+        .map(|elem| Box::new(elem) as _)
+        .collect()
+    }
+}

niri-visual-tests/src/cases/layout.rs

@@ -0,0 +1,271 @@
+use std::collections::HashMap;
+use std::time::Duration;
+
+use niri::animation::Clock;
+use niri::layout::scrolling::ColumnWidth;
+use niri::layout::{ActivateWindow, AddWindowTarget, LayoutElement as _, Options};
+use niri::render_helpers::RenderTarget;
+use niri_config::{Color, FloatOrInt, OutputName};
+use smithay::backend::renderer::element::RenderElement;
+use smithay::backend::renderer::gles::GlesRenderer;
+use smithay::desktop::layer_map_for_output;
+use smithay::output::{Mode, Output, PhysicalProperties, Subpixel};
+use smithay::utils::{Physical, Size};
+
+use super::{Args, TestCase};
+use crate::test_window::TestWindow;
+
+type DynStepFn = Box<dyn FnOnce(&mut Layout)>;
+
+pub struct Layout {
+    output: Output,
+    windows: Vec<TestWindow>,
+    clock: Clock,
+    layout: niri::layout::Layout<TestWindow>,
+    start_time: Duration,
+    steps: HashMap<Duration, DynStepFn>,
+}
+
+impl Layout {
+    pub fn new(args: Args) -> Self {
+        let Args { size, clock } = args;
+
+        let output = Output::new(
+            String::new(),
+            PhysicalProperties {
+                size: Size::from((size.w, size.h)),
+                subpixel: Subpixel::Unknown,
+                make: String::new(),
+                model: String::new(),
+            },
+        );
+        let mode = Some(Mode {
+            size: size.to_physical(1),
+            refresh: 60000,
+        });
+        output.change_current_state(mode, None, None, None);
+        output.user_data().insert_if_missing(|| OutputName {
+            connector: String::new(),
+            make: None,
+            model: None,
+            serial: None,
+        });
+
+        let options = Options {
+            focus_ring: niri_config::FocusRing {
+                off: true,
+                ..Default::default()
+            },
+            border: niri_config::Border {
+                off: false,
+                width: FloatOrInt(4.),
+                active_color: Color::from_rgba8_unpremul(255, 163, 72, 255),
+                inactive_color: Color::from_rgba8_unpremul(50, 50, 50, 255),
+                active_gradient: None,
+                inactive_gradient: None,
+            },
+            ..Default::default()
+        };
+        let mut layout = niri::layout::Layout::with_options(clock.clone(), options);
+        layout.add_output(output.clone());
+
+        let start_time = clock.now_unadjusted();
+
+        Self {
+            output,
+            windows: Vec::new(),
+            clock,
+            layout,
+            start_time,
+            steps: HashMap::new(),
+        }
+    }
+
+    pub fn open_in_between(args: Args) -> Self {
+        let mut rv = Self::new(args);
+
+        rv.add_window(TestWindow::freeform(0), Some(ColumnWidth::Proportion(0.3)));
+        rv.add_window(TestWindow::freeform(1), Some(ColumnWidth::Proportion(0.3)));
+        rv.layout.activate_window(&0);
+
+        rv.add_step(500, |l| {
+            let win = TestWindow::freeform(2);
+            l.add_window(win.clone(), Some(ColumnWidth::Proportion(0.3)));
+            l.layout.start_open_animation_for_window(win.id());
+        });
+
+        rv
+    }
+
+    pub fn open_multiple_quickly(args: Args) -> Self {
+        let mut rv = Self::new(args);
+
+        for delay in [100, 200, 300] {
+            rv.add_step(delay, move |l| {
+                let win = TestWindow::freeform(delay as usize);
+                l.add_window(win.clone(), Some(ColumnWidth::Proportion(0.3)));
+                l.layout.start_open_animation_for_window(win.id());
+            });
+        }
+
+        rv
+    }
+
+    pub fn open_multiple_quickly_big(args: Args) -> Self {
+        let mut rv = Self::new(args);
+
+        for delay in [100, 200, 300] {
+            rv.add_step(delay, move |l| {
+                let win = TestWindow::freeform(delay as usize);
+                l.add_window(win.clone(), Some(ColumnWidth::Proportion(0.5)));
+                l.layout.start_open_animation_for_window(win.id());
+            });
+        }
+
+        rv
+    }
+
+    pub fn open_to_the_left(args: Args) -> Self {
+        let mut rv = Self::new(args);
+
+        rv.add_window(TestWindow::freeform(0), Some(ColumnWidth::Proportion(0.3)));
+        rv.add_window(TestWindow::freeform(1), Some(ColumnWidth::Proportion(0.3)));
+
+        rv.add_step(500, |l| {
+            let win = TestWindow::freeform(2);
+            let right_of = l.windows[0].clone();
+            l.add_window_right_of(&right_of, win.clone(), Some(ColumnWidth::Proportion(0.3)));
+            l.layout.start_open_animation_for_window(win.id());
+        });
+
+        rv
+    }
+
+    pub fn open_to_the_left_big(args: Args) -> Self {
+        let mut rv = Self::new(args);
+
+        rv.add_window(TestWindow::freeform(0), Some(ColumnWidth::Proportion(0.3)));
+        rv.add_window(TestWindow::freeform(1), Some(ColumnWidth::Proportion(0.8)));
+
+        rv.add_step(500, |l| {
+            let win = TestWindow::freeform(2);
+            let right_of = l.windows[0].clone();
+            l.add_window_right_of(&right_of, win.clone(), Some(ColumnWidth::Proportion(0.5)));
+            l.layout.start_open_animation_for_window(win.id());
+        });
+
+        rv
+    }
+
+    fn add_window(&mut self, mut window: TestWindow, width: Option<ColumnWidth>) {
+        let ws = self.layout.active_workspace().unwrap();
+        let min_size = window.min_size();
+        let max_size = window.max_size();
+        window.request_size(
+            ws.new_window_size(width, None, false, window.rules(), (min_size, max_size)),
+            false,
+            None,
+        );
+        window.communicate();
+
+        self.layout.add_window(
+            window.clone(),
+            AddWindowTarget::Auto,
+            width,
+            None,
+            false,
+            false,
+            ActivateWindow::default(),
+        );
+        self.windows.push(window);
+    }
+
+    fn add_window_right_of(
+        &mut self,
+        right_of: &TestWindow,
+        mut window: TestWindow,
+        width: Option<ColumnWidth>,
+    ) {
+        let ws = self.layout.active_workspace().unwrap();
+        let min_size = window.min_size();
+        let max_size = window.max_size();
+        window.request_size(
+            ws.new_window_size(width, None, false, window.rules(), (min_size, max_size)),
+            false,
+            None,
+        );
+        window.communicate();
+
+        self.layout.add_window(
+            window.clone(),
+            AddWindowTarget::NextTo(right_of.id()),
+            width,
+            None,
+            false,
+            false,
+            ActivateWindow::default(),
+        );
+        self.windows.push(window);
+    }
+
+    fn add_step(&mut self, delay_ms: u64, f: impl FnOnce(&mut Self) + 'static) {
+        self.steps
+            .insert(Duration::from_millis(delay_ms), Box::new(f) as _);
+    }
+}
+
+impl TestCase for Layout {
+    fn resize(&mut self, width: i32, height: i32) {
+        let mode = Some(Mode {
+            size: Size::from((width, height)),
+            refresh: 60000,
+        });
+        self.output.change_current_state(mode, None, None, None);
+        layer_map_for_output(&self.output).arrange();
+        self.layout.update_output_size(&self.output);
+        for win in &self.windows {
+            if win.communicate() {
+                self.layout.update_window(win.id(), None);
+            }
+        }
+    }
+
+    fn are_animations_ongoing(&self) -> bool {
+        self.layout.are_animations_ongoing(Some(&self.output)) || !self.steps.is_empty()
+    }
+
+    fn advance_animations(&mut self, _current_time: Duration) {
+        let now_unadjusted = self.clock.now_unadjusted();
+        let run = self
+            .steps
+            .keys()
+            .copied()
+            .filter(|delay| self.start_time + *delay <= now_unadjusted)
+            .collect::<Vec<_>>();
+        for delay in &run {
+            let now = self.start_time + *delay;
+            self.clock.set_unadjusted(now);
+            self.layout.advance_animations();
+
+            let f = self.steps.remove(delay).unwrap();
+            f(self);
+        }
+
+        self.clock.set_unadjusted(now_unadjusted);
+        self.layout.advance_animations();
+    }
+
+    fn render(
+        &mut self,
+        renderer: &mut GlesRenderer,
+        _size: Size<i32, Physical>,
+    ) -> Vec<Box<dyn RenderElement<GlesRenderer>>> {
+        self.layout.update_render_elements(Some(&self.output));
+        self.layout
+            .monitor_for_output(&self.output)
+            .unwrap()
+            .render_elements(renderer, RenderTarget::Output, true)
+            .map(|elem| Box::new(elem) as _)
+            .collect()
+    }
+}

niri-visual-tests/src/cases/mod.rs

@@ -0,0 +1,41 @@
+use std::time::Duration;
+
+use niri::animation::Clock;
+use smithay::backend::renderer::element::RenderElement;
+use smithay::backend::renderer::gles::GlesRenderer;
+use smithay::utils::{Logical, Physical, Size};
+
+pub mod gradient_angle;
+pub mod gradient_area;
+pub mod gradient_oklab;
+pub mod gradient_oklab_alpha;
+pub mod gradient_oklch_alpha;
+pub mod gradient_oklch_decreasing;
+pub mod gradient_oklch_increasing;
+pub mod gradient_oklch_longer;
+pub mod gradient_oklch_shorter;
+pub mod gradient_srgb;
+pub mod gradient_srgb_alpha;
+pub mod gradient_srgblinear;
+pub mod gradient_srgblinear_alpha;
+pub mod layout;
+pub mod tile;
+pub mod window;
+
+pub struct Args {
+    pub size: Size<i32, Logical>,
+    pub clock: Clock,
+}
+
+pub trait TestCase {
+    fn resize(&mut self, _width: i32, _height: i32) {}
+    fn are_animations_ongoing(&self) -> bool {
+        false
+    }
+    fn advance_animations(&mut self, _current_time: Duration) {}
+    fn render(
+        &mut self,
+        renderer: &mut GlesRenderer,
+        size: Size<i32, Physical>,
+    ) -> Vec<Box<dyn RenderElement<GlesRenderer>>>;
+}

niri-visual-tests/src/cases/tile.rs

@@ -0,0 +1,130 @@
+use std::rc::Rc;
+use std::time::Duration;
+
+use niri::layout::Options;
+use niri::render_helpers::RenderTarget;
+use niri_config::{Color, FloatOrInt};
+use smithay::backend::renderer::element::RenderElement;
+use smithay::backend::renderer::gles::GlesRenderer;
+use smithay::utils::{Physical, Point, Rectangle, Scale, Size};
+
+use super::{Args, TestCase};
+use crate::test_window::TestWindow;
+
+pub struct Tile {
+    window: TestWindow,
+    tile: niri::layout::tile::Tile<TestWindow>,
+}
+
+impl Tile {
+    pub fn freeform(args: Args) -> Self {
+        let window = TestWindow::freeform(0);
+        Self::with_window(args, window)
+    }
+
+    pub fn fixed_size(args: Args) -> Self {
+        let window = TestWindow::fixed_size(0);
+        Self::with_window(args, window)
+    }
+
+    pub fn fixed_size_with_csd_shadow(args: Args) -> Self {
+        let window = TestWindow::fixed_size(0);
+        window.set_csd_shadow_width(64);
+        Self::with_window(args, window)
+    }
+
+    pub fn freeform_open(args: Args) -> Self {
+        let mut rv = Self::freeform(args);
+        rv.window.set_color([0.1, 0.1, 0.1, 1.]);
+        rv.tile.start_open_animation();
+        rv
+    }
+
+    pub fn fixed_size_open(args: Args) -> Self {
+        let mut rv = Self::fixed_size(args);
+        rv.window.set_color([0.1, 0.1, 0.1, 1.]);
+        rv.tile.start_open_animation();
+        rv
+    }
+
+    pub fn fixed_size_with_csd_shadow_open(args: Args) -> Self {
+        let mut rv = Self::fixed_size_with_csd_shadow(args);
+        rv.window.set_color([0.1, 0.1, 0.1, 1.]);
+        rv.tile.start_open_animation();
+        rv
+    }
+
+    pub fn with_window(args: Args, window: TestWindow) -> Self {
+        let Args { size, clock } = args;
+
+        let options = Options {
+            focus_ring: niri_config::FocusRing {
+                off: true,
+                ..Default::default()
+            },
+            border: niri_config::Border {
+                off: false,
+                width: FloatOrInt(32.),
+                active_color: Color::from_rgba8_unpremul(255, 163, 72, 255),
+                ..Default::default()
+            },
+            ..Default::default()
+        };
+
+        let mut tile = niri::layout::tile::Tile::new(
+            window.clone(),
+            size.to_f64(),
+            1.,
+            clock,
+            Rc::new(options),
+        );
+
+        tile.request_tile_size(size.to_f64(), false, None);
+        window.communicate();
+
+        Self { window, tile }
+    }
+}
+
+impl TestCase for Tile {
+    fn resize(&mut self, width: i32, height: i32) {
+        let size = Size::from((width, height)).to_f64();
+        self.tile
+            .update_config(size, 1., self.tile.options().clone());
+        self.tile.request_tile_size(size, false, None);
+        self.window.communicate();
+    }
+
+    fn are_animations_ongoing(&self) -> bool {
+        self.tile.are_animations_ongoing()
+    }
+
+    fn advance_animations(&mut self, _current_time: Duration) {
+        self.tile.advance_animations();
+    }
+
+    fn render(
+        &mut self,
+        renderer: &mut GlesRenderer,
+        size: Size<i32, Physical>,
+    ) -> Vec<Box<dyn RenderElement<GlesRenderer>>> {
+        let size = size.to_f64();
+        let tile_size = self.tile.tile_size().to_physical(1.);
+        let location = Point::from((size.w - tile_size.w, size.h - tile_size.h)).downscale(2.);
+
+        self.tile.update(
+            true,
+            Rectangle::new(Point::from((-location.x, -location.y)), size.to_logical(1.)),
+        );
+        self.tile
+            .render(
+                renderer,
+                location,
+                Scale::from(1.),
+                true,
+                RenderTarget::Output,
+            )
+            .map(|elem| Box::new(elem) as _)
+            .collect()
+    }
+}

niri-visual-tests/src/cases/window.rs

@@ -0,0 +1,67 @@
+use niri::layout::LayoutElement;
+use niri::render_helpers::RenderTarget;
+use smithay::backend::renderer::element::RenderElement;
+use smithay::backend::renderer::gles::GlesRenderer;
+use smithay::utils::{Physical, Point, Scale, Size};
+
+use super::{Args, TestCase};
+use crate::test_window::TestWindow;
+
+pub struct Window {
+    window: TestWindow,
+}
+
+impl Window {
+    pub fn freeform(args: Args) -> Self {
+        let mut window = TestWindow::freeform(0);
+        window.request_size(args.size, false, None);
+        window.communicate();
+        Self { window }
+    }
+
+    pub fn fixed_size(args: Args) -> Self {
+        let mut window = TestWindow::fixed_size(0);
+        window.request_size(args.size, false, None);
+        window.communicate();
+        Self { window }
+    }
+
+    pub fn fixed_size_with_csd_shadow(args: Args) -> Self {
+        let mut window = TestWindow::fixed_size(0);
+        window.set_csd_shadow_width(64);
+        window.request_size(args.size, false, None);
+        window.communicate();
+        Self { window }
+    }
+}
+
+impl TestCase for Window {
+    fn resize(&mut self, width: i32, height: i32) {
+        self.window
+            .request_size(Size::from((width, height)), false, None);
+        self.window.communicate();
+    }
+
+    fn render(
+        &mut self,
+        renderer: &mut GlesRenderer,
+        size: Size<i32, Physical>,
+    ) -> Vec<Box<dyn RenderElement<GlesRenderer>>> {
+        let win_size = self.window.size().to_physical(1);
+        let location = Point::from((size.w - win_size.w, size.h - win_size.h))
+            .to_f64()
+            .downscale(2.);
+
+        self.window
+            .render(
+                renderer,
+                location,
+                Scale::from(1.),
+                1.,
+                RenderTarget::Output,
+            )
+            .into_iter()
+            .map(|elem| Box::new(elem) as _)
+            .collect()
+    }
+}

niri-visual-tests/src/main.rs

@@ -0,0 +1,184 @@
+#[macro_use]
+extern crate tracing;
+
+use std::env;
+
+use adw::prelude::{AdwApplicationWindowExt, NavigationPageExt};
+use cases::Args;
+use gtk::prelude::{ApplicationExt, ApplicationExtManual, BoxExt, GtkWindowExt, WidgetExt};
+use gtk::{gdk, gio, glib};
+use smithay_view::SmithayView;
+use tracing_subscriber::EnvFilter;
+
+use crate::cases::gradient_angle::GradientAngle;
+use crate::cases::gradient_area::GradientArea;
+use crate::cases::gradient_oklab::GradientOklab;
+use crate::cases::gradient_oklab_alpha::GradientOklabAlpha;
+use crate::cases::gradient_oklch_alpha::GradientOklchAlpha;
+use crate::cases::gradient_oklch_decreasing::GradientOklchDecreasing;
+use crate::cases::gradient_oklch_increasing::GradientOklchIncreasing;
+use crate::cases::gradient_oklch_longer::GradientOklchLonger;
+use crate::cases::gradient_oklch_shorter::GradientOklchShorter;
+use crate::cases::gradient_srgb::GradientSrgb;
+use crate::cases::gradient_srgb_alpha::GradientSrgbAlpha;
+use crate::cases::gradient_srgblinear::GradientSrgbLinear;
+use crate::cases::gradient_srgblinear_alpha::GradientSrgbLinearAlpha;
+use crate::cases::layout::Layout;
+use crate::cases::tile::Tile;
+use crate::cases::window::Window;
+use crate::cases::TestCase;
+
+mod cases;
+mod smithay_view;
+mod test_window;
+
+fn main() -> glib::ExitCode {
+    let directives =
+        env::var("RUST_LOG").unwrap_or_else(|_| "niri-visual-tests=debug,niri=debug".to_owned());
+    let env_filter = EnvFilter::builder().parse_lossy(directives);
+    tracing_subscriber::fmt()
+        .compact()
+        .with_env_filter(env_filter)
+        .init();
+
+    let app = adw::Application::new(None::<&str>, gio::ApplicationFlags::NON_UNIQUE);
+    app.connect_startup(on_startup);
+    app.connect_activate(build_ui);
+    app.run()
+}
+
+fn on_startup(_app: &adw::Application) {
+    // Load our CSS.
+    let provider = gtk::CssProvider::new();
+    provider.load_from_string(include_str!("../resources/style.css"));
+    if let Some(display) = gdk::Display::default() {
+        gtk::style_context_add_provider_for_display(
+            &display,
+            &provider,
+            gtk::STYLE_PROVIDER_PRIORITY_APPLICATION,
+        );
+    }
+}
+
+fn build_ui(app: &adw::Application) {
+    let stack = gtk::Stack::new();
+    let anim_adjustment = gtk::Adjustment::new(1., 0., 10., 0.1, 0.5, 0.);
+
+    struct S {
+        stack: gtk::Stack,
+        anim_adjustment: gtk::Adjustment,
+    }
+
+    impl S {
+        fn add<T: TestCase + 'static>(&self, make: impl Fn(Args) -> T + 'static, title: &str) {
+            let view = SmithayView::new(make, &self.anim_adjustment);
+            self.stack.add_titled(&view, None, title);
+        }
+    }
+
+    let s = S {
+        stack: stack.clone(),
+        anim_adjustment: anim_adjustment.clone(),
+    };
+
+    s.add(Window::freeform, "Freeform Window");
+    s.add(Window::fixed_size, "Fixed Size Window");
+    s.add(
+        Window::fixed_size_with_csd_shadow,
+        "Fixed Size Window - CSD Shadow",
+    );
+
+    s.add(Tile::freeform, "Freeform Tile");
+    s.add(Tile::fixed_size, "Fixed Size Tile");
+    s.add(
+        Tile::fixed_size_with_csd_shadow,
+        "Fixed Size Tile - CSD Shadow",
+    );
+    s.add(Tile::freeform_open, "Freeform Tile - Open");
+    s.add(Tile::fixed_size_open, "Fixed Size Tile - Open");
+    s.add(
+        Tile::fixed_size_with_csd_shadow_open,
+        "Fixed Size Tile - CSD Shadow - Open",
+    );
+
+    s.add(Layout::open_in_between, "Layout - Open In-Between");
+    s.add(
+        Layout::open_multiple_quickly,
+        "Layout - Open Multiple Quickly",
+    );
+    s.add(
+        Layout::open_multiple_quickly_big,
+        "Layout - Open Multiple Quickly - Big",
+    );
+    s.add(Layout::open_to_the_left, "Layout - Open To The Left");
+    s.add(
+        Layout::open_to_the_left_big,
+        "Layout - Open To The Left - Big",
+    );
+
+    s.add(GradientAngle::new, "Gradient - Angle");
+    s.add(GradientArea::new, "Gradient - Area");
+    s.add(GradientSrgb::new, "Gradient - Srgb");
+    s.add(GradientSrgbLinear::new, "Gradient - SrgbLinear");
+    s.add(GradientOklab::new, "Gradient - Oklab");
+    s.add(GradientOklchShorter::new, "Gradient - Oklch Shorter");
+    s.add(GradientOklchLonger::new, "Gradient - Oklch Longer");
+    s.add(GradientOklchIncreasing::new, "Gradient - Oklch Increasing");
+    s.add(GradientOklchDecreasing::new, "Gradient - Oklch Decreasing");
+    s.add(GradientSrgbAlpha::new, "Gradient - Srgb Alpha");
+    s.add(GradientSrgbLinearAlpha::new, "Gradient - SrgbLinear Alpha");
+    s.add(GradientOklabAlpha::new, "Gradient - Oklab Alpha");
+    s.add(GradientOklchAlpha::new, "Gradient - Oklch Alpha");
+
+    let content_headerbar = adw::HeaderBar::new();
+
+    let anim_scale = gtk::Scale::new(gtk::Orientation::Horizontal, Some(&anim_adjustment));
+    anim_scale.set_hexpand(true);
+
+    let anim_control_bar = gtk::Box::new(gtk::Orientation::Horizontal, 6);
+    anim_control_bar.add_css_class("anim-control-bar");
+    anim_control_bar.append(&gtk::Label::new(Some("Slowdown")));
+    anim_control_bar.append(&anim_scale);
+
+    let content_view = adw::ToolbarView::new();
+    content_view.set_top_bar_style(adw::ToolbarStyle::RaisedBorder);
+    content_view.set_bottom_bar_style(adw::ToolbarStyle::RaisedBorder);
+    content_view.add_top_bar(&content_headerbar);
+    content_view.add_bottom_bar(&anim_control_bar);
+    content_view.set_content(Some(&stack));
+    let content = adw::NavigationPage::new(
+        &content_view,
+        stack
+            .page(&stack.visible_child().unwrap())
+            .title()
+            .as_deref()
+            .unwrap(),
+    );
+
+    let sidebar_header = adw::HeaderBar::new();
+    let stack_sidebar = gtk::StackSidebar::new();
+    stack_sidebar.set_stack(&stack);
+    let sidebar_view = adw::ToolbarView::new();
+    sidebar_view.add_top_bar(&sidebar_header);
+    sidebar_view.set_content(Some(&stack_sidebar));
+    let sidebar = adw::NavigationPage::new(&sidebar_view, "Tests");
+
+    let split_view = adw::NavigationSplitView::new();
+    split_view.set_content(Some(&content));
+    split_view.set_sidebar(Some(&sidebar));
+
+    stack.connect_visible_child_notify(move |stack| {
+        content.set_title(
+            stack
+                .visible_child()
+                .and_then(|c| stack.page(&c).title())
+                .as_deref()
+                .unwrap_or_default(),
+        )
+    });
+
+    let window = adw::ApplicationWindow::new(app);
+    window.set_title(Some("niri visual tests"));
+    window.set_content(Some(&split_view));
+    window.present();
+}

niri-visual-tests/src/smithay_view.rs

@@ -0,0 +1,275 @@
+use gtk::glib;
+use gtk::prelude::*;
+use gtk::subclass::prelude::*;
+use smithay::utils::Size;
+
+use crate::cases::{Args, TestCase};
+
+mod imp {
+    use std::cell::{Cell, OnceCell, RefCell};
+    use std::ptr::null;
+    use std::time::Duration;
+
+    use anyhow::{ensure, Context};
+    use gtk::gdk;
+    use gtk::prelude::*;
+    use niri::animation::Clock;
+    use niri::render_helpers::{resources, shaders};
+    use smithay::backend::egl::ffi::egl;
+    use smithay::backend::egl::EGLContext;
+    use smithay::backend::renderer::gles::GlesRenderer;
+    use smithay::backend::renderer::{Color32F, Frame, Renderer, Unbind};
+    use smithay::utils::{Physical, Rectangle, Scale, Transform};
+
+    use super::*;
+
+    type DynMakeTestCase = Box<dyn Fn(Args) -> Box<dyn TestCase>>;
+
+    #[derive(Default)]
+    pub struct SmithayView {
+        gl_area: gtk::GLArea,
+        size: Cell<(i32, i32)>,
+        renderer: RefCell<Option<Result<GlesRenderer, ()>>>,
+        pub make_test_case: OnceCell<DynMakeTestCase>,
+        test_case: RefCell<Option<Box<dyn TestCase>>>,
+        pub clock: RefCell<Clock>,
+    }
+
+    #[glib::object_subclass]
+    impl ObjectSubclass for SmithayView {
+        const NAME: &'static str = "NiriSmithayView";
+        type Type = super::SmithayView;
+        type ParentType = gtk::Widget;
+
+        fn class_init(klass: &mut Self::Class) {
+            klass.set_layout_manager_type::<gtk::BinLayout>();
+        }
+    }
+
+    impl ObjectImpl for SmithayView {
+        fn constructed(&self) {
+            let obj = self.obj();
+
+            self.parent_constructed();
+
+            self.gl_area.set_allowed_apis(gdk::GLAPI::GLES);
+            self.gl_area.set_parent(&*obj);
+
+            self.gl_area.connect_resize({
+                let imp = self.downgrade();
+                move |_, width, height| {
+                    if let Some(imp) = imp.upgrade() {
+                        imp.resize(width, height);
+                    }
+                }
+            });
+
+            self.gl_area.connect_render({
+                let imp = self.downgrade();
+                move |_, gl_context| {
+                    if let Some(imp) = imp.upgrade() {
+                        if let Err(err) = imp.render(gl_context) {
+                            warn!("error rendering: {err:?}");
+                        }
+                    }
+                    glib::Propagation::Stop
+                }
+            });
+
+            obj.add_tick_callback(|obj, _frame_clock| {
+                let imp = obj.imp();
+
+                if let Some(case) = &mut *imp.test_case.borrow_mut() {
+                    if case.are_animations_ongoing() {
+                        imp.gl_area.queue_draw();
+                    }
+                }
+
+                glib::ControlFlow::Continue
+            });
+        }
+
+        fn dispose(&self) {
+            self.gl_area.unparent();
+        }
+    }
+
+    impl WidgetImpl for SmithayView {
+        fn unmap(&self) {
+            self.test_case.replace(None);
+            self.parent_unmap();
+        }
+
+        fn unrealize(&self) {
+            self.renderer.replace(None);
+            self.parent_unrealize();
+        }
+    }
+
+    impl SmithayView {
+        fn resize(&self, width: i32, height: i32) {
+            self.size.set((width, height));
+
+            if let Some(case) = &mut *self.test_case.borrow_mut() {
+                case.resize(width, height);
+            }
+        }
+
+        fn render(&self, _gl_context: &gdk::GLContext) -> anyhow::Result<()> {
+            // Set up the Smithay renderer.
+            let mut renderer = self.renderer.borrow_mut();
+            let renderer = renderer.get_or_insert_with(|| {
+                unsafe { create_renderer() }
+                    .map_err(|err| warn!("error creating a Smithay renderer: {err:?}"))
+            });
+            let Ok(renderer) = renderer else {
+                return Ok(());
+            };
+
+            let size = self.size.get();
+
+            let frame_clock = self.obj().frame_clock().unwrap();
+            let time = Duration::from_micros(frame_clock.frame_time() as u64);
+            self.clock.borrow_mut().set_unadjusted(time);
+
+            // Create the test case if missing.
+            let mut case = self.test_case.borrow_mut();
+            let case = case.get_or_insert_with(|| {
+                let make = self.make_test_case.get().unwrap();
+                let args = Args {
+                    size: Size::from(size),
+                    clock: self.clock.borrow().clone(),
+                };
+                make(args)
+            });
+
+            case.advance_animations(self.clock.borrow_mut().now());
+
+            let rect: Rectangle<i32, Physical> = Rectangle::from_size(Size::from(size));
+
+            let elements = unsafe {
+                with_framebuffer_save_restore(renderer, |renderer| {
+                    case.render(renderer, Size::from(size))
+                })
+            }?;
+
+            let mut frame = renderer
+                .render(rect.size, Transform::Normal)
+                .context("error creating frame")?;
+
+            frame
+                .clear(Color32F::from([0.3, 0.3, 0.3, 1.]), &[rect])
+                .context("error clearing")?;
+
+            for element in elements.iter().rev() {
+                let src = element.src();
+                let dst = element.geometry(Scale::from(1.));
+
+                if let Some(mut damage) = rect.intersection(dst) {
+                    damage.loc -= dst.loc;
+                    element
+                        .draw(&mut frame, src, dst, &[damage], &[])
+                        .context("error drawing element")?;
+                }
+            }
+
+            Ok(())
+        }
+    }
+
+    unsafe fn create_renderer() -> anyhow::Result<GlesRenderer> {
+        smithay::backend::egl::ffi::make_sure_egl_is_loaded()
+            .context("error loading EGL symbols in Smithay")?;
+
+        let egl_display = egl::GetCurrentDisplay();
+        ensure!(egl_display != egl::NO_DISPLAY, "no current EGL display");
+
+        let egl_context = egl::GetCurrentContext();
+        ensure!(egl_context != egl::NO_CONTEXT, "no current EGL context");
+
+        // There's no config ID on the EGL context and there's no current EGL surface, but we don't
+        // really use it anyway so just get some random one.
+        let mut egl_config_id = null();
+        let mut num_configs = 0;
+        let res = egl::GetConfigs(egl_display, &mut egl_config_id, 1, &mut num_configs);
+        ensure!(res == egl::TRUE, "error choosing EGL config");
+        ensure!(num_configs != 0, "no EGL config");
+
+        let egl_context = EGLContext::from_raw(egl_display, egl_config_id as *const _, egl_context)
+            .context("error creating EGL context")?;
+
+        let mut renderer = GlesRenderer::new(egl_context).context("error creating GlesRenderer")?;
+
+        resources::init(&mut renderer);
+        shaders::init(&mut renderer);
+
+        Ok(renderer)
+    }
+
+    unsafe fn with_framebuffer_save_restore<T>(
+        renderer: &mut GlesRenderer,
+        f: impl FnOnce(&mut GlesRenderer) -> T,
+    ) -> anyhow::Result<T> {
+        let mut framebuffer = 0;
+        renderer
+            .with_context(|gl| unsafe {
+                gl.GetIntegerv(
+                    smithay::backend::renderer::gles::ffi::FRAMEBUFFER_BINDING,
+                    &mut framebuffer,
+                );
+            })
+            .context("error running closure in GL context")?;
+        ensure!(framebuffer != 0, "error getting the framebuffer");
+
+        let rv = f(renderer);
+
+        renderer.unbind().context("error unbinding")?;
+        renderer
+            .with_context(|gl| unsafe {
+                gl.BindFramebuffer(
+                    smithay::backend::renderer::gles::ffi::FRAMEBUFFER,
+                    framebuffer as u32,
+                );
+            })
+            .context("error running closure in GL context")?;
+
+        Ok(rv)
+    }
+}
+
+glib::wrapper! {
+    pub struct SmithayView(ObjectSubclass<imp::SmithayView>)
+        @extends gtk::Widget;
+}
+
+impl SmithayView {
+    pub fn new<T: TestCase + 'static>(
+        make_test_case: impl Fn(Args) -> T + 'static,
+        anim_adjustment: &gtk::Adjustment,
+    ) -> Self {
+        let obj: Self = glib::Object::builder().build();
+
+        let make = move |args| Box::new(make_test_case(args)) as Box<dyn TestCase>;
+        let make_test_case = Box::new(make) as _;
+        let _ = obj.imp().make_test_case.set(make_test_case);
+
+        anim_adjustment.connect_value_changed({
+            let obj = obj.downgrade();
+            move |adj| {
+                if let Some(obj) = obj.upgrade() {
+                    let mut clock = obj.imp().clock.borrow_mut();
+                    let instantly = adj.value() == 0.0;
+                    let rate = if instantly {
+                        1.0
+                    } else {
+                        1.0 / adj.value().max(0.001)
+                    };
+                    clock.set_rate(rate);
+                    clock.set_complete_instantly(instantly);
+                }
+            }
+        });
+
+        obj
+    }
+}

niri-visual-tests/src/test_window.rs

@@ -0,0 +1,273 @@
+use std::cell::RefCell;
+use std::cmp::{max, min};
+use std::rc::Rc;
+
+use niri::layout::{
+    ConfigureIntent, InteractiveResizeData, LayoutElement, LayoutElementRenderElement,
+    LayoutElementRenderSnapshot,
+};
+use niri::render_helpers::renderer::NiriRenderer;
+use niri::render_helpers::solid_color::{SolidColorBuffer, SolidColorRenderElement};
+use niri::render_helpers::{RenderTarget, SplitElements};
+use niri::utils::transaction::Transaction;
+use niri::window::ResolvedWindowRules;
+use smithay::backend::renderer::element::{Id, Kind};
+use smithay::output::{self, Output};
+use smithay::reexports::wayland_server::protocol::wl_surface::WlSurface;
+use smithay::utils::{Logical, Point, Scale, Serial, Size, Transform};
+
+#[derive(Debug)]
+struct TestWindowInner {
+    size: Size<i32, Logical>,
+    requested_size: Option<Size<i32, Logical>>,
+    min_size: Size<i32, Logical>,
+    max_size: Size<i32, Logical>,
+    buffer: SolidColorBuffer,
+    pending_fullscreen: bool,
+    csd_shadow_width: i32,
+    csd_shadow_buffer: SolidColorBuffer,
+}
+
+#[derive(Debug, Clone)]
+pub struct TestWindow {
+    id: usize,
+    inner: Rc<RefCell<TestWindowInner>>,
+}
+
+impl TestWindow {
+    pub fn freeform(id: usize) -> Self {
+        let size = Size::from((100, 200));
+        let min_size = Size::from((0, 0));
+        let max_size = Size::from((0, 0));
+        let buffer = SolidColorBuffer::new(size.to_f64(), [0.15, 0.64, 0.41, 1.]);
+
+        Self {
+            id,
+            inner: Rc::new(RefCell::new(TestWindowInner {
+                size,
+                requested_size: None,
+                min_size,
+                max_size,
+                buffer,
+                pending_fullscreen: false,
+                csd_shadow_width: 0,
+                csd_shadow_buffer: SolidColorBuffer::new((0., 0.), [0., 0., 0., 0.3]),
+            })),
+        }
+    }
+
+    pub fn fixed_size(id: usize) -> Self {
+        let rv = Self::freeform(id);
+        rv.set_min_size((200, 400).into());
+        rv.set_max_size((200, 400).into());
+        rv.set_color([0.88, 0.11, 0.14, 1.]);
+        rv.communicate();
+        rv
+    }
+
+    pub fn set_min_size(&self, size: Size<i32, Logical>) {
+        self.inner.borrow_mut().min_size = size;
+    }
+
+    pub fn set_max_size(&self, size: Size<i32, Logical>) {
+        self.inner.borrow_mut().max_size = size;
+    }
+
+    pub fn set_color(&self, color: [f32; 4]) {
+        self.inner.borrow_mut().buffer.set_color(color);
+    }
+
+    pub fn set_csd_shadow_width(&self, width: i32) {
+        self.inner.borrow_mut().csd_shadow_width = width;
+    }
+
+    pub fn communicate(&self) -> bool {
+        let mut rv = false;
+        let mut inner = self.inner.borrow_mut();
+
+        let mut new_size = inner.size;
+
+        if let Some(size) = inner.requested_size {
+            assert!(size.w >= 0);
+            assert!(size.h >= 0);
+
+            if size.w != 0 {
+                new_size.w = size.w;
+            }
+            if size.h != 0 {
+                new_size.h = size.h;
+            }
+        }
+
+        if inner.max_size.w > 0 {
+            new_size.w = min(new_size.w, inner.max_size.w);
+        }
+        if inner.max_size.h > 0 {
+            new_size.h = min(new_size.h, inner.max_size.h);
+        }
+        if inner.min_size.w > 0 {
+            new_size.w = max(new_size.w, inner.min_size.w);
+        }
+        if inner.min_size.h > 0 {
+            new_size.h = max(new_size.h, inner.min_size.h);
+        }
+
+        if inner.size != new_size {
+            inner.size = new_size;
+            inner.buffer.resize(new_size.to_f64());
+            rv = true;
+        }
+
+        let mut csd_shadow_size = new_size;
+        csd_shadow_size.w += inner.csd_shadow_width * 2;
+        csd_shadow_size.h += inner.csd_shadow_width * 2;
+        inner.csd_shadow_buffer.resize(csd_shadow_size.to_f64());
+
+        rv
+    }
+}
+
+impl LayoutElement for TestWindow {
+    type Id = usize;
+
+    fn id(&self) -> &Self::Id {
+        &self.id
+    }
+
+    fn size(&self) -> Size<i32, Logical> {
+        self.inner.borrow().size
+    }
+
+    fn buf_loc(&self) -> Point<i32, Logical> {
+        (0, 0).into()
+    }
+
+    fn is_in_input_region(&self, _point: Point<f64, Logical>) -> bool {
+        false
+    }
+
+    fn render<R: NiriRenderer>(
+        &self,
+        _renderer: &mut R,
+        location: Point<f64, Logical>,
+        _scale: Scale<f64>,
+        alpha: f32,
+        _target: RenderTarget,
+    ) -> SplitElements<LayoutElementRenderElement<R>> {
+        let inner = self.inner.borrow();
+
+        SplitElements {
+            normal: vec![
+                SolidColorRenderElement::from_buffer(
+                    &inner.buffer,
+                    location,
+                    alpha,
+                    Kind::Unspecified,
+                )
+                .into(),
+                SolidColorRenderElement::from_buffer(
+                    &inner.csd_shadow_buffer,
+                    location
+                        - Point::from((inner.csd_shadow_width, inner.csd_shadow_width)).to_f64(),
+                    alpha,
+                    Kind::Unspecified,
+                )
+                .into(),
+            ],
+            popups: vec![],
+        }
+    }
+
+    fn request_size(
+        &mut self,
+        size: Size<i32, Logical>,
+        _animate: bool,
+        _transaction: Option<Transaction>,
+    ) {
+        self.inner.borrow_mut().requested_size = Some(size);
+        self.inner.borrow_mut().pending_fullscreen = false;
+    }
+
+    fn request_fullscreen(&mut self, _size: Size<i32, Logical>) {
+        self.inner.borrow_mut().pending_fullscreen = true;
+    }
+
+    fn min_size(&self) -> Size<i32, Logical> {
+        self.inner.borrow().min_size
+    }
+
+    fn max_size(&self) -> Size<i32, Logical> {
+        self.inner.borrow().max_size
+    }
+
+    fn is_wl_surface(&self, _wl_surface: &WlSurface) -> bool {
+        false
+    }
+
+    fn set_preferred_scale_transform(&self, _scale: output::Scale, _transform: Transform) {}
+
+    fn has_ssd(&self) -> bool {
+        false
+    }
+
+    fn output_enter(&self, _output: &Output) {}
+
+    fn output_leave(&self, _output: &Output) {}
+
+    fn set_offscreen_element_id(&self, _id: Option<Id>) {}
+
+    fn set_activated(&mut self, _active: bool) {}
+
+    fn set_active_in_column(&mut self, _active: bool) {}
+
+    fn set_floating(&mut self, _floating: bool) {}
+
+    fn set_bounds(&self, _bounds: Size<i32, Logical>) {}
+
+    fn configure_intent(&self) -> ConfigureIntent {
+        ConfigureIntent::CanSend
+    }
+
+    fn send_pending_configure(&mut self) {}
+
+    fn is_fullscreen(&self) -> bool {
+        false
+    }
+
+    fn is_pending_fullscreen(&self) -> bool {
+        self.inner.borrow().pending_fullscreen
+    }
+
+    fn requested_size(&self) -> Option<Size<i32, Logical>> {
+        self.inner.borrow().requested_size
+    }
+
+    fn is_child_of(&self, _parent: &Self) -> bool {
+        false
+    }
+
+    fn refresh(&self) {}
+
+    fn rules(&self) -> &ResolvedWindowRules {
+        static EMPTY: ResolvedWindowRules = ResolvedWindowRules::empty();
+        &EMPTY
+    }
+
+    fn animation_snapshot(&self) -> Option<&LayoutElementRenderSnapshot> {
+        None
+    }
+
+    fn take_animation_snapshot(&mut self) -> Option<LayoutElementRenderSnapshot> {
+        None
+    }
+
+    fn set_interactive_resize(&mut self, _data: Option<InteractiveResizeData>) {}
+
+    fn cancel_interactive_resize(&mut self) {}
+
+    fn on_commit(&mut self, _serial: Serial) {}
+
+    fn interactive_resize_data(&self) -> Option<InteractiveResizeData> {
+        None
+    }
+}

niri.spec.rpkg

@@ -0,0 +1,150 @@
+%bcond_without check
+
+%global cargo_install_lib 0
+
+# We want panic backtraces to work without installing the debuginfo package,
+# so we leave the debuginfo in the main binary.
+%global debug_package %{nil}
+%global __strip /bin/true
+
+# To reduce the file size, do some convincing of rust-srpm-macros
+# to leave alone the chosen debug settings from Cargo.toml.
+%global rustflags_debuginfo please-remove-me
+%global build_rustflags %{shrink:
+  -Copt-level=%rustflags_opt_level
+  -Ccodegen-units=%rustflags_codegen_units
+  -Cstrip=none
+  %{expr:0%{?_include_frame_pointers} && ("%{_arch}" != "ppc64le" && "%{_arch}" != "s390x" && "%{_arch}" != "i386") ? "-Cforce-frame-pointers=yes" : ""}
+  -Clink-arg=-Wl,-z,relro
+  -Clink-arg=-Wl,-z,now
+  %[0%{?_package_note_status} ? "-Clink-arg=%_package_note_flags" : ""]
+  --cap-lints=warn
+}
+
+# Convince rust-srpm-macros to use Cargo.lock with the Smithay commit.
+%global __cargo_common_opts %{?_smp_mflags} -Z avoid-dev-deps --locked
+
+%global version {{{ git_dir_version }}}
+
+Name:           niri
+Version:        %{version}
+Release:        1%{?dist}
+Summary:        Scrollable-tiling Wayland compositor
+
+SourceLicense:  GPL-3.0-or-later
+
+# 0BSD OR MIT OR Apache-2.0
+# Apache-2.0
+# Apache-2.0 OR BSL-1.0
+# Apache-2.0 OR MIT
+# Apache-2.0 WITH LLVM-exception OR Apache-2.0 OR MIT
+# BSD-2-Clause
+# BSD-2-Clause OR Apache-2.0 OR MIT
+# BSD-3-Clause OR MIT OR Apache-2.0
+# GPL-3.0-or-later
+# ISC
+# MIT
+# MIT AND (MIT OR Apache-2.0)
+# MIT OR Apache-2.0
+# (MIT OR Apache-2.0) AND BSD-3-Clause
+# (MIT OR Apache-2.0) AND Unicode-3.0
+# MIT OR Apache-2.0 OR Zlib
+# MIT OR Zlib OR Apache-2.0
+# MPL-2.0
+# Unicode-3.0
+# Unlicense OR MIT
+# Zlib OR Apache-2.0 OR MIT
+License:        (0BSD OR MIT OR Apache-2.0) AND (Apache-2.0) AND (Apache-2.0 OR BSL-1.0) AND (Apache-2.0 OR MIT) AND (Apache-2.0 WITH LLVM-exception OR Apache-2.0 OR MIT) AND (BSD-2-Clause) AND (BSD-2-Clause OR Apache-2.0 OR MIT) AND (BSD-3-Clause OR MIT OR Apache-2.0) AND (GPL-3.0-or-later) AND (ISC) AND (MIT) AND (MIT AND (MIT OR Apache-2.0)) AND (MIT OR Apache-2.0) AND ((MIT OR Apache-2.0) AND BSD-3-Clause) AND ((MIT OR Apache-2.0) AND Unicode-3.0) AND (MIT OR Apache-2.0 OR Zlib) AND (MIT OR Zlib OR Apache-2.0) AND (MPL-2.0) AND (Unicode-3.0) AND (Unlicense OR MIT) AND (Zlib OR Apache-2.0 OR MIT) License:        ((MIT OR Apache-2.0) AND BSD-3-Clause) AND (0BSD OR MIT OR Apache-2.0) AND (Apache-2.0) AND (Apache-2.0 OR BSL-1.0) AND (Apache-2.0 OR MIT) AND (Apache-2.0 WITH LLVM-exception OR Apache-2.0 OR MIT) AND (BSD-2-Clause) AND (BSD-2-Clause OR Apache-2.0 OR MIT) AND (BSD-3-Clause) AND (BSD-3-Clause OR MIT OR Apache-2.0) AND (GPL-3.0-or-later) AND (ISC) AND (MIT) AND (MIT AND (MIT OR Apache-2.0)) AND (MIT OR Apache-2.0) AND (MIT OR Apache-2.0 OR Zlib) AND (MIT OR Zlib OR Apache-2.0) AND (MPL-2.0) AND (Unicode-3.0) AND (Unlicense OR MIT) AND (Zlib OR Apache-2.0 OR MIT)
+# LICENSE.dependencies contains a full license breakdown
+
+URL:            https://github.com/YaLTeR/niri
+VCS:            {{{ git_dir_vcs }}}
+Source:         {{{ git_dir_pack }}}
+
+BuildRequires:  cargo-rpm-macros >= 26
+BuildRequires:  pkgconfig(udev)
+BuildRequires:  pkgconfig(gbm)
+BuildRequires:  pkgconfig(xkbcommon)
+BuildRequires:  wayland-devel
+BuildRequires:  pkgconfig(libinput)
+BuildRequires:  pkgconfig(dbus-1)
+BuildRequires:  pkgconfig(systemd)
+BuildRequires:  pkgconfig(libseat)
+BuildRequires:  pkgconfig(libdisplay-info)
+BuildRequires:  pipewire-devel
+BuildRequires:  pango-devel
+BuildRequires:  cairo-gobject-devel
+# Needed for pipewire-rs
+BuildRequires:  clang
+
+Requires:       mesa-dri-drivers
+Requires:       mesa-libEGL
+
+# Portal implementations used by niri
+Recommends:     xdg-desktop-portal-gtk
+Recommends:     xdg-desktop-portal-gnome
+Recommends:     gnome-keyring
+
+# Suggested utilities, bound in the default config
+Recommends:     alacritty
+Recommends:     fuzzel
+Recommends:     swaylock
+# Suggested utilities
+Recommends:     swaybg
+Recommends:     mako
+Recommends:     swayidle
+
+%description
+A scrollable-tiling Wayland compositor.
+
+Windows are arranged in columns on an infinite strip going to the right.
+Opening a new window never causes existing windows to resize.
+
+%prep
+{{{ git_dir_setup_macro }}}
+
+%cargo_prep -N
+
+# We're doing an online build.
+sed -i 's/^offline = true$//' .cargo/config.toml
+
+# Final step in leaving alone our debug settings.
+sed -i 's/.*please-remove-me$//' .cargo/config.toml
+
+# Set the commit string.
+sed -i 's/\[env\]/[env]\nNIRI_BUILD_COMMIT="%{version}"/' .cargo/config.toml
+
+%build
+%cargo_build
+
+%install
+%cargo_install
+
+install -Dm755 -t %{buildroot}%{_bindir} ./resources/niri-session
+install -Dm644 -t %{buildroot}%{_datadir}/wayland-sessions ./resources/niri.desktop
+install -Dm644 -t %{buildroot}%{_datadir}/xdg-desktop-portal ./resources/niri-portals.conf
+install -Dm644 -t %{buildroot}%{_userunitdir} ./resources/niri.service
+install -Dm644 -t %{buildroot}%{_userunitdir} ./resources/niri-shutdown.target
+
+%if %{with check}
+%check
+export XDG_RUNTIME_DIR="$(mktemp -d)"
+%cargo_test -- --workspace --exclude niri-visual-tests
+%endif
+
+%files
+%license LICENSE
+%doc README.md
+%doc resources/default-config.kdl
+%doc wiki
+%{_bindir}/niri
+%{_bindir}/niri-session
+%{_datadir}/wayland-sessions/niri.desktop
+%dir %{_datadir}/xdg-desktop-portal
+%{_datadir}/xdg-desktop-portal/niri-portals.conf
+%{_userunitdir}/niri.service
+%{_userunitdir}/niri-shutdown.target
+
+%changelog
+{{{ git_dir_changelog }}}
+

resources/default-config.kdl

@@ -1,6 +1,11 @@
 // This config is in the KDL format: https://kdl.dev
 // "/-" comments out the following node.
+// Check the wiki for a full description of the configuration:
+// https://github.com/YaLTeR/niri/wiki/Configuration:-Overview
 
+// Input device configuration.
+// Find the full list of options on the wiki:
+// https://github.com/YaLTeR/niri/wiki/Configuration:-Input
 input {
     keyboard {
         xkb {
@@ -11,129 +16,207 @@ input {
             // layout "us,ru"
             // options "grp:win_space_toggle,compose:ralt,ctrl:nocaps"
         }
-
-        // You can set the keyboard repeat parameters. The defaults match wlroots and sway.
-        // Delay is in milliseconds before the repeat starts. Rate is in characters per second.
-        // repeat-delay 600
-        // repeat-rate 25
-
-        // Niri can remember the keyboard layout globally (the default) or per-window.
-        // - "global" - layout change is global for all windows.
-        // - "window" - layout is tracked for each window individually.
-        // track-layout "global"
     }
 
     // Next sections include libinput settings.
     // Omitting settings disables them, or leaves them at their default values.
     touchpad {
+        // off
         tap
+        // dwt
+        // dwtp
         natural-scroll
         // accel-speed 0.2
+        // accel-profile "flat"
+        // scroll-method "two-finger"
+        // disabled-on-external-mouse
     }
 
-    tablet {
-        // Set the name of the output (see below) which the tablet will map to.
-        // If this is unset or the output doesn't exist, the tablet maps to one of the
-        // existing outputs.
-        map-to-output "eDP-1"
+    mouse {
+        // off
+        // natural-scroll
+        // accel-speed 0.2
+        // accel-profile "flat"
+        // scroll-method "no-scroll"
     }
+
+    trackpoint {
+        // off
+        // natural-scroll
+        // accel-speed 0.2
+        // accel-profile "flat"
+        // scroll-method "on-button-down"
+        // scroll-button 273
+        // middle-emulation
+    }
+
+    // Uncomment this to make the mouse warp to the center of newly focused windows.
+    // warp-mouse-to-focus
+
+    // Focus windows and outputs automatically when moving the mouse into them.
+    // Setting max-scroll-amount="0%" makes it work only on windows already fully on screen.
+    // focus-follows-mouse max-scroll-amount="0%"
 }
 
-// You can configure outputs by their name, which you can find with wayland-info(1).
+// You can configure outputs by their name, which you can find
+// by running `niri msg outputs` while inside a niri instance.
 // The built-in laptop monitor is usually called "eDP-1".
-// Remember to uncommend the node by removing "/-"!
+// Find more information on the wiki:
+// https://github.com/YaLTeR/niri/wiki/Configuration:-Outputs
+// Remember to uncomment the node by removing "/-"!
 /-output "eDP-1" {
     // Uncomment this line to disable this output.
     // off
 
-    // Scale is a floating-point number, but at the moment only integer values work.
-    scale 2.0
-
     // Resolution and, optionally, refresh rate of the output.
     // The format is "<width>x<height>" or "<width>x<height>@<refresh rate>".
     // If the refresh rate is omitted, niri will pick the highest refresh rate
     // for the resolution.
     // If the mode is omitted altogether or is invalid, niri will pick one automatically.
-    // All valid modes are listed in niri's debug output when an output is connected.
-    mode "1920x1080@144"
+    // Run `niri msg outputs` while inside a niri instance to list all outputs and their modes.
+    mode "1920x1080@120.030"
+
+    // You can use integer or fractional scale, for example use 1.5 for 150% scale.
+    scale 2
+
+    // Transform allows to rotate the output counter-clockwise, valid values are:
+    // normal, 90, 180, 270, flipped, flipped-90, flipped-180 and flipped-270.
+    transform "normal"
 
     // Position of the output in the global coordinate space.
     // This affects directional monitor actions like "focus-monitor-left", and cursor movement.
     // The cursor can only move between directly adjacent outputs.
-    // Output scale has to be taken into account for positioning:
+    // Output scale and rotation has to be taken into account for positioning:
     // outputs are sized in logical, or scaled, pixels.
     // For example, a 3840×2160 output with scale 2.0 will have a logical size of 1920×1080,
     // so to put another output directly adjacent to it on the right, set its x to 1920.
-    // It the position is unset or results in an overlap, the output is instead placed
+    // If the position is unset or results in an overlap, the output is instead placed
     // automatically.
     position x=1280 y=0
 }
 
+// Settings that influence how windows are positioned and sized.
+// Find more information on the wiki:
+// https://github.com/YaLTeR/niri/wiki/Configuration:-Layout
+layout {
+    // Set gaps around windows in logical pixels.
+    gaps 16
+
+    // When to center a column when changing focus, options are:
+    // - "never", default behavior, focusing an off-screen column will keep at the left
+    //   or right edge of the screen.
+    // - "always", the focused column will always be centered.
+    // - "on-overflow", focusing a column will center it if it doesn't fit
+    //   together with the previously focused column.
+    center-focused-column "never"
+
+    // You can customize the widths that "switch-preset-column-width" (Mod+R) toggles between.
+    preset-column-widths {
+        // Proportion sets the width as a fraction of the output width, taking gaps into account.
+        // For example, you can perfectly fit four windows sized "proportion 0.25" on an output.
+        // The default preset widths are 1/3, 1/2 and 2/3 of the output.
+        proportion 0.33333
+        proportion 0.5
+        proportion 0.66667
+
+        // Fixed sets the width in logical pixels exactly.
+        // fixed 1920
+    }
+
+    // You can also customize the heights that "switch-preset-window-height" (Mod+Shift+R) toggles between.
+    // preset-window-heights { }
+
+    // You can change the default width of the new windows.
+    default-column-width { proportion 0.5; }
+    // If you leave the brackets empty, the windows themselves will decide their initial width.
+    // default-column-width {}
+
+    // By default focus ring and border are rendered as a solid background rectangle
+    // behind windows. That is, they will show up through semitransparent windows.
+    // This is because windows using client-side decorations can have an arbitrary shape.
+    //
+    // If you don't like that, you should uncomment `prefer-no-csd` below.
+    // Niri will draw focus ring and border *around* windows that agree to omit their
+    // client-side decorations.
+    //
+    // Alternatively, you can override it with a window rule called
+    // `draw-border-with-background`.
+
+    // You can change how the focus ring looks.
+    focus-ring {
+        // Uncomment this line to disable the focus ring.
+        // off
+
+        // How many logical pixels the ring extends out from the windows.
+        width 4
+
+        // Colors can be set in a variety of ways:
+        // - CSS named colors: "red"
+        // - RGB hex: "#rgb", "#rgba", "#rrggbb", "#rrggbbaa"
+        // - CSS-like notation: "rgb(255, 127, 0)", rgba(), hsl() and a few others.
+
+        // Color of the ring on the active monitor.
+        active-color "#7fc8ff"
+
+        // Color of the ring on inactive monitors.
+        inactive-color "#505050"
+
+        // You can also use gradients. They take precedence over solid colors.
+        // Gradients are rendered the same as CSS linear-gradient(angle, from, to).
+        // The angle is the same as in linear-gradient, and is optional,
+        // defaulting to 180 (top-to-bottom gradient).
+        // You can use any CSS linear-gradient tool on the web to set these up.
+        // Changing the color space is also supported, check the wiki for more info.
+        //
+        // active-gradient from="#80c8ff" to="#bbddff" angle=45
+
+        // You can also color the gradient relative to the entire view
+        // of the workspace, rather than relative to just the window itself.
+        // To do that, set relative-to="workspace-view".
+        //
+        // inactive-gradient from="#505050" to="#808080" angle=45 relative-to="workspace-view"
+    }
+
+    // You can also add a border. It's similar to the focus ring, but always visible.
+    border {
+        // The settings are the same as for the focus ring.
+        // If you enable the border, you probably want to disable the focus ring.
+        off
+
+        width 4
+        active-color "#ffc87f"
+        inactive-color "#505050"
+
+        // active-gradient from="#ffbb66" to="#ffc880" angle=45 relative-to="workspace-view"
+        // inactive-gradient from="#505050" to="#808080" angle=45 relative-to="workspace-view"
+    }
+
+    // Struts shrink the area occupied by windows, similarly to layer-shell panels.
+    // You can think of them as a kind of outer gaps. They are set in logical pixels.
+    // Left and right struts will cause the next window to the side to always be visible.
+    // Top and bottom struts will simply add outer gaps in addition to the area occupied by
+    // layer-shell panels and regular gaps.
+    struts {
+        // left 64
+        // right 64
+        // top 64
+        // bottom 64
+    }
+}
+
 // Add lines like this to spawn processes at startup.
 // Note that running niri as a session supports xdg-desktop-autostart,
 // which may be more convenient to use.
+// See the binds section below for more spawn examples.
 // spawn-at-startup "alacritty" "-e" "fish"
 
-// You can change how the focus ring looks.
-focus-ring {
-    // Uncomment this line to disable the focus ring.
-    // off
-
-    // How many logical pixels the ring extends out from the windows.
-    width 4
-
-    // Color of the ring on the active monitor: red, green, blue, alpha.
-    active-color 127 200 255 255
-
-    // Color of the ring on inactive monitors: red, green, blue, alpha.
-    inactive-color 80 80 80 255
-}
-
-cursor {
-    // Change the theme and size of the cursor as well as set the
-    // `XCURSOR_THEME` and `XCURSOR_SIZE` env variables.
-    // xcursor-theme "default"
-    // xcursor-size 24
-}
-
 // Uncomment this line to ask the clients to omit their client-side decorations if possible.
 // If the client will specifically ask for CSD, the request will be honored.
-// Additionally, clients will be informed that they are tiled, removing some rounded corners.
+// Additionally, clients will be informed that they are tiled, removing some client-side rounded corners.
+// This option will also fix border/focus ring drawing behind some semitransparent windows.
+// After enabling or disabling this, you need to restart the apps for this to take effect.
 // prefer-no-csd
 
-// You can customize the widths that "switch-preset-column-width" (Mod+R) toggles between.
-preset-column-widths {
-    // Proportion sets the width as a fraction of the output width, taking gaps into account.
-    // For example, you can perfectly fit four windows sized "proportion 0.25" on an output.
-    // The default preset widths are 1/3, 1/2 and 2/3 of the output.
-    proportion 0.333
-    proportion 0.5
-    proportion 0.667
-
-    // Fixed sets the width in logical pixels exactly.
-    // fixed 1920
-}
-
-// You can change the default width of the new windows.
-default-column-width { proportion 0.5; }
-// If you leave the brackets empty, the windows themselves will decide their initial width.
-// default-column-width {}
-
-// Set gaps around windows in logical pixels.
-gaps 16
-
-// Struts shrink the area occupied by windows, similarly to layer-shell panels.
-// You can think of them as a kind of outer gaps. They are set in logical pixels.
-// Left and right struts will cause the next window to the side to always be visible.
-// Top and bottom struts will simply add outer gaps in addition to the area occupied by
-// layer-shell panels and regular gaps.
-struts {
-    // left 64
-    // right 64
-    // top 64
-    // bottom 64
-}
-
 // You can change the path where screenshots are saved.
 // A ~ at the front will be expanded to the home directory.
 // The path is formatted with strftime(3) to give you the screenshot date and time.
@@ -142,6 +225,59 @@ screenshot-path "~/Pictures/Screenshots/Screenshot from %Y-%m-%d %H-%M-%S.png"
 // You can also set this to null to disable saving screenshots to disk.
 // screenshot-path null
 
+// Animation settings.
+// The wiki explains how to configure individual animations:
+// https://github.com/YaLTeR/niri/wiki/Configuration:-Animations
+animations {
+    // Uncomment to turn off all animations.
+    // off
+
+    // Slow down all animations by this factor. Values below 1 speed them up instead.
+    // slowdown 3.0
+}
+
+// Window rules let you adjust behavior for individual windows.
+// Find more information on the wiki:
+// https://github.com/YaLTeR/niri/wiki/Configuration:-Window-Rules
+
+// Work around WezTerm's initial configure bug
+// by setting an empty default-column-width.
+window-rule {
+    // This regular expression is intentionally made as specific as possible,
+    // since this is the default config, and we want no false positives.
+    // You can get away with just app-id="wezterm" if you want.
+    match app-id=r#"^org\.wezfurlong\.wezterm$"#
+    default-column-width {}
+}
+
+// Open the Firefox picture-in-picture player as floating by default.
+window-rule {
+    // This app-id regular expression will work for both:
+    // - host Firefox (app-id is "firefox")
+    // - Flatpak Firefox (app-id is "org.mozilla.firefox")
+    match app-id=r#"firefox$"# title="^Picture-in-Picture$"
+    open-floating true
+}
+
+// Example: block out two password managers from screen capture.
+// (This example rule is commented out with a "/-" in front.)
+/-window-rule {
+    match app-id=r#"^org\.keepassxc\.KeePassXC$"#
+    match app-id=r#"^org\.gnome\.World\.Secrets$"#
+
+    block-out-from "screen-capture"
+
+    // Use this instead if you want them visible on third-party screenshot tools.
+    // block-out-from "screencast"
+}
+
+// Example: enable rounded corners for all windows.
+// (This example rule is commented out with a "/-" in front.)
+/-window-rule {
+    geometry-corner-radius 12
+    clip-to-geometry true
+}
+
 binds {
     // Keys consist of modifiers separated by + signs, followed by an XKB key name
     // in the end. To find an XKB name for a particular key, you may use a program
@@ -149,35 +285,49 @@ binds {
     //
     // "Mod" is a special modifier equal to Super when running on a TTY, and to Alt
     // when running as a winit window.
+    //
+    // Most actions that you can bind here can also be invoked programmatically with
+    // `niri msg action do-something`.
+
+    // Mod-Shift-/, which is usually the same as Mod-?,
+    // shows a list of important hotkeys.
+    Mod+Shift+Slash { show-hotkey-overlay; }
 
     // Suggested binds for running programs: terminal, app launcher, screen locker.
     Mod+T { spawn "alacritty"; }
     Mod+D { spawn "fuzzel"; }
-    Mod+Alt+L { spawn "swaylock"; }
+    Super+Alt+L { spawn "swaylock"; }
+
+    // You can also use a shell. Do this if you need pipes, multiple commands, etc.
+    // Note: the entire command goes as a single argument in the end.
+    // Mod+T { spawn "bash" "-c" "notify-send hello && exec alacritty"; }
 
     // Example volume keys mappings for PipeWire & WirePlumber.
-    XF86AudioRaiseVolume { spawn "wpctl" "set-volume" "@DEFAULT_AUDIO_SINK@" "0.1+"; }
-    XF86AudioLowerVolume { spawn "wpctl" "set-volume" "@DEFAULT_AUDIO_SINK@" "0.1-"; }
+    // The allow-when-locked=true property makes them work even when the session is locked.
+    XF86AudioRaiseVolume allow-when-locked=true { spawn "wpctl" "set-volume" "@DEFAULT_AUDIO_SINK@" "0.1+"; }
+    XF86AudioLowerVolume allow-when-locked=true { spawn "wpctl" "set-volume" "@DEFAULT_AUDIO_SINK@" "0.1-"; }
+    XF86AudioMute        allow-when-locked=true { spawn "wpctl" "set-mute" "@DEFAULT_AUDIO_SINK@" "toggle"; }
+    XF86AudioMicMute     allow-when-locked=true { spawn "wpctl" "set-mute" "@DEFAULT_AUDIO_SOURCE@" "toggle"; }
 
     Mod+Q { close-window; }
 
-    Mod+H     { focus-column-left; }
-    Mod+J     { focus-window-down; }
-    Mod+K     { focus-window-up; }
-    Mod+L     { focus-column-right; }
     Mod+Left  { focus-column-left; }
     Mod+Down  { focus-window-down; }
     Mod+Up    { focus-window-up; }
     Mod+Right { focus-column-right; }
+    Mod+H     { focus-column-left; }
+    Mod+J     { focus-window-down; }
+    Mod+K     { focus-window-up; }
+    Mod+L     { focus-column-right; }
 
-    Mod+Ctrl+H     { move-column-left; }
-    Mod+Ctrl+J     { move-window-down; }
-    Mod+Ctrl+K     { move-window-up; }
-    Mod+Ctrl+L     { move-column-right; }
     Mod+Ctrl+Left  { move-column-left; }
     Mod+Ctrl+Down  { move-window-down; }
     Mod+Ctrl+Up    { move-window-up; }
     Mod+Ctrl+Right { move-column-right; }
+    Mod+Ctrl+H     { move-column-left; }
+    Mod+Ctrl+J     { move-window-down; }
+    Mod+Ctrl+K     { move-window-up; }
+    Mod+Ctrl+L     { move-column-right; }
 
     // Alternative commands that move across workspaces when reaching
     // the first or last window in a column.
@@ -186,38 +336,95 @@ binds {
     // Mod+Ctrl+J     { move-window-down-or-to-workspace-down; }
     // Mod+Ctrl+K     { move-window-up-or-to-workspace-up; }
 
-    Mod+Shift+H     { focus-monitor-left; }
-    Mod+Shift+J     { focus-monitor-down; }
-    Mod+Shift+K     { focus-monitor-up; }
-    Mod+Shift+L     { focus-monitor-right; }
+    Mod+Home { focus-column-first; }
+    Mod+End  { focus-column-last; }
+    Mod+Ctrl+Home { move-column-to-first; }
+    Mod+Ctrl+End  { move-column-to-last; }
+
     Mod+Shift+Left  { focus-monitor-left; }
     Mod+Shift+Down  { focus-monitor-down; }
     Mod+Shift+Up    { focus-monitor-up; }
     Mod+Shift+Right { focus-monitor-right; }
+    Mod+Shift+H     { focus-monitor-left; }
+    Mod+Shift+J     { focus-monitor-down; }
+    Mod+Shift+K     { focus-monitor-up; }
+    Mod+Shift+L     { focus-monitor-right; }
 
-    Mod+Shift+Ctrl+H     { move-window-to-monitor-left; }
-    Mod+Shift+Ctrl+J     { move-window-to-monitor-down; }
-    Mod+Shift+Ctrl+K     { move-window-to-monitor-up; }
-    Mod+Shift+Ctrl+L     { move-window-to-monitor-right; }
-    Mod+Shift+Ctrl+Left  { move-window-to-monitor-left; }
-    Mod+Shift+Ctrl+Down  { move-window-to-monitor-down; }
-    Mod+Shift+Ctrl+Up    { move-window-to-monitor-up; }
-    Mod+Shift+Ctrl+Right { move-window-to-monitor-right; }
+    Mod+Shift+Ctrl+Left  { move-column-to-monitor-left; }
+    Mod+Shift+Ctrl+Down  { move-column-to-monitor-down; }
+    Mod+Shift+Ctrl+Up    { move-column-to-monitor-up; }
+    Mod+Shift+Ctrl+Right { move-column-to-monitor-right; }
+    Mod+Shift+Ctrl+H     { move-column-to-monitor-left; }
+    Mod+Shift+Ctrl+J     { move-column-to-monitor-down; }
+    Mod+Shift+Ctrl+K     { move-column-to-monitor-up; }
+    Mod+Shift+Ctrl+L     { move-column-to-monitor-right; }
+
+    // Alternatively, there are commands to move just a single window:
+    // Mod+Shift+Ctrl+Left  { move-window-to-monitor-left; }
+    // ...
+
+    // And you can also move a whole workspace to another monitor:
+    // Mod+Shift+Ctrl+Left  { move-workspace-to-monitor-left; }
+    // ...
 
-    Mod+U              { focus-workspace-down; }
-    Mod+I              { focus-workspace-up; }
     Mod+Page_Down      { focus-workspace-down; }
     Mod+Page_Up        { focus-workspace-up; }
-    Mod+Ctrl+U         { move-window-to-workspace-down; }
-    Mod+Ctrl+I         { move-window-to-workspace-up; }
-    Mod+Ctrl+Page_Down { move-window-to-workspace-down; }
-    Mod+Ctrl+Page_Up   { move-window-to-workspace-up; }
+    Mod+U              { focus-workspace-down; }
+    Mod+I              { focus-workspace-up; }
+    Mod+Ctrl+Page_Down { move-column-to-workspace-down; }
+    Mod+Ctrl+Page_Up   { move-column-to-workspace-up; }
+    Mod+Ctrl+U         { move-column-to-workspace-down; }
+    Mod+Ctrl+I         { move-column-to-workspace-up; }
+
+    // Alternatively, there are commands to move just a single window:
+    // Mod+Ctrl+Page_Down { move-window-to-workspace-down; }
+    // ...
 
-    Mod+Shift+U         { move-workspace-down; }
-    Mod+Shift+I         { move-workspace-up; }
     Mod+Shift+Page_Down { move-workspace-down; }
     Mod+Shift+Page_Up   { move-workspace-up; }
+    Mod+Shift+U         { move-workspace-down; }
+    Mod+Shift+I         { move-workspace-up; }
 
+    // You can bind mouse wheel scroll ticks using the following syntax.
+    // These binds will change direction based on the natural-scroll setting.
+    //
+    // To avoid scrolling through workspaces really fast, you can use
+    // the cooldown-ms property. The bind will be rate-limited to this value.
+    // You can set a cooldown on any bind, but it's most useful for the wheel.
+    Mod+WheelScrollDown      cooldown-ms=150 { focus-workspace-down; }
+    Mod+WheelScrollUp        cooldown-ms=150 { focus-workspace-up; }
+    Mod+Ctrl+WheelScrollDown cooldown-ms=150 { move-column-to-workspace-down; }
+    Mod+Ctrl+WheelScrollUp   cooldown-ms=150 { move-column-to-workspace-up; }
+
+    Mod+WheelScrollRight      { focus-column-right; }
+    Mod+WheelScrollLeft       { focus-column-left; }
+    Mod+Ctrl+WheelScrollRight { move-column-right; }
+    Mod+Ctrl+WheelScrollLeft  { move-column-left; }
+
+    // Usually scrolling up and down with Shift in applications results in
+    // horizontal scrolling; these binds replicate that.
+    Mod+Shift+WheelScrollDown      { focus-column-right; }
+    Mod+Shift+WheelScrollUp        { focus-column-left; }
+    Mod+Ctrl+Shift+WheelScrollDown { move-column-right; }
+    Mod+Ctrl+Shift+WheelScrollUp   { move-column-left; }
+
+    // Similarly, you can bind touchpad scroll "ticks".
+    // Touchpad scrolling is continuous, so for these binds it is split into
+    // discrete intervals.
+    // These binds are also affected by touchpad's natural-scroll, so these
+    // example binds are "inverted", since we have natural-scroll enabled for
+    // touchpads by default.
+    // Mod+TouchpadScrollDown { spawn "wpctl" "set-volume" "@DEFAULT_AUDIO_SINK@" "0.02+"; }
+    // Mod+TouchpadScrollUp   { spawn "wpctl" "set-volume" "@DEFAULT_AUDIO_SINK@" "0.02-"; }
+
+    // You can refer to workspaces by index. However, keep in mind that
+    // niri is a dynamic workspace system, so these commands are kind of
+    // "best effort". Trying to refer to a workspace index bigger than
+    // the current workspace count will instead refer to the bottommost
+    // (empty) workspace.
+    //
+    // For example, with 2 workspaces + 1 empty, indices 3, 4, 5 and so on
+    // will all refer to the 3rd workspace.
     Mod+1 { focus-workspace 1; }
     Mod+2 { focus-workspace 2; }
     Mod+3 { focus-workspace 3; }
@@ -227,20 +434,36 @@ binds {
     Mod+7 { focus-workspace 7; }
     Mod+8 { focus-workspace 8; }
     Mod+9 { focus-workspace 9; }
-    Mod+Ctrl+1 { move-window-to-workspace 1; }
-    Mod+Ctrl+2 { move-window-to-workspace 2; }
-    Mod+Ctrl+3 { move-window-to-workspace 3; }
-    Mod+Ctrl+4 { move-window-to-workspace 4; }
-    Mod+Ctrl+5 { move-window-to-workspace 5; }
-    Mod+Ctrl+6 { move-window-to-workspace 6; }
-    Mod+Ctrl+7 { move-window-to-workspace 7; }
-    Mod+Ctrl+8 { move-window-to-workspace 8; }
-    Mod+Ctrl+9 { move-window-to-workspace 9; }
+    Mod+Ctrl+1 { move-column-to-workspace 1; }
+    Mod+Ctrl+2 { move-column-to-workspace 2; }
+    Mod+Ctrl+3 { move-column-to-workspace 3; }
+    Mod+Ctrl+4 { move-column-to-workspace 4; }
+    Mod+Ctrl+5 { move-column-to-workspace 5; }
+    Mod+Ctrl+6 { move-column-to-workspace 6; }
+    Mod+Ctrl+7 { move-column-to-workspace 7; }
+    Mod+Ctrl+8 { move-column-to-workspace 8; }
+    Mod+Ctrl+9 { move-column-to-workspace 9; }
 
+    // Alternatively, there are commands to move just a single window:
+    // Mod+Ctrl+1 { move-window-to-workspace 1; }
+
+    // Switches focus between the current and the previous workspace.
+    // Mod+Tab { focus-workspace-previous; }
+
+    // The following binds move the focused window in and out of a column.
+    // If the window is alone, they will consume it into the nearby column to the side.
+    // If the window is already in a column, they will expel it out.
+    Mod+BracketLeft  { consume-or-expel-window-left; }
+    Mod+BracketRight { consume-or-expel-window-right; }
+
+    // Consume one window from the right to the bottom of the focused column.
     Mod+Comma  { consume-window-into-column; }
+    // Expel the bottom window from the focused column to the right.
     Mod+Period { expel-window-from-column; }
 
     Mod+R { switch-preset-column-width; }
+    Mod+Shift+R { switch-preset-window-height; }
+    Mod+Ctrl+R { reset-window-height; }
     Mod+F { maximize-column; }
     Mod+Shift+F { fullscreen-window; }
     Mod+C { center-column; }
@@ -260,6 +483,10 @@ binds {
     Mod+Shift+Minus { set-window-height "-10%"; }
     Mod+Shift+Equal { set-window-height "+10%"; }
 
+    // Move the focused window between the floating and the tiling layout.
+    Mod+V       { toggle-window-floating; }
+    Mod+Shift+V { switch-focus-between-floating-and-tiling; }
+
     // Actions to switch layouts.
     // Note: if you uncomment these, make sure you do NOT have
     // a matching layout switch hotkey configured in xkb options above.
@@ -272,8 +499,11 @@ binds {
     Ctrl+Print { screenshot-screen; }
     Alt+Print { screenshot-window; }
 
+    // The quit action will show a confirmation dialog to avoid accidental exits.
     Mod+Shift+E { quit; }
-    Mod+Shift+P { power-off-monitors; }
+    Ctrl+Alt+Delete { quit; }
 
-    Mod+Shift+Ctrl+T { toggle-debug-tint; }
+    // Powers off the monitors. To turn them back on, do any input like
+    // moving the mouse or pressing any other key.
+    Mod+Shift+P { power-off-monitors; }
 }

resources/dinit/niri

@@ -0,0 +1,8 @@
+type              = process
+command           = niri --session
+restart           = false
+working-dir       = $HOME
+depends-on        = dbus
+after             = niri-shutdown
+chain-to          = niri-shutdown
+options:          always-chain

resources/dinit/niri-shutdown

@@ -0,0 +1,3 @@
+type               = scripted
+command            = dinitctl -u setenv WAYLAND_DISPLAY= XDG_SESSION_TYPE= XDG_CURRENT_DESKTOP= NIRI_SOCKET=
+restart            = false

resources/mutter-x11-interop.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<protocol name="mutter_x11_interop">
+  <description summary="X11 interoperability helper">
+    This protocol is intended to be used by the portal backend to map Wayland
+    dialogs as modal dialogs on top of X11 windows.
+  </description>
+
+  <interface name="mutter_x11_interop" version="1">
+    <description summary="X11 interoperability helper"/>
+
+    <request name="destroy" type="destructor"/>
+
+    <request name="set_x11_parent">
+      <arg name="surface" type="object" interface="wl_surface"/>
+      <arg name="xwindow" type="uint"/>
+    </request>
+  </interface>
+</protocol>

resources/niri-portals.conf

@@ -1,3 +1,5 @@
 [preferred]
 default=gnome;gtk;
+org.freedesktop.impl.portal.Access=gtk;
+org.freedesktop.impl.portal.Notification=gtk;
 org.freedesktop.impl.portal.Secret=gnome-keyring;

resources/niri-session

@@ -11,37 +11,51 @@ if [ -n "$SHELL" ] &&
   fi
 fi
 
-# Make sure there's no already running session.
-if systemctl --user -q is-active niri.service; then
-  echo 'A niri session is already running.'
-  exit 1
+# Try to detect the service manager that is being used
+if hash systemctl &> /dev/null; then
+    # Make sure there's no already running session.
+    if systemctl --user -q is-active niri.service; then
+      echo 'A niri session is already running.'
+      exit 1
+    fi
+
+    # Reset failed state of all user units.
+    systemctl --user reset-failed
+
+    # Import the login manager environment.
+    systemctl --user import-environment
+
+    # DBus activation environment is independent from systemd. While most of
+    # dbus-activated services are already using `SystemdService` directive, some
+    # still don't and thus we should set the dbus environment with a separate
+    # command.
+    if hash dbus-update-activation-environment 2>/dev/null; then
+        dbus-update-activation-environment --all
+    fi
+
+    # Start niri and wait for it to terminate.
+    systemctl --user --wait start niri.service
+
+    # Force stop of graphical-session.target.
+    systemctl --user start --job-mode=replace-irreversibly niri-shutdown.target
+
+    # Unset environment that we've set.
+    systemctl --user unset-environment WAYLAND_DISPLAY XDG_SESSION_TYPE XDG_CURRENT_DESKTOP NIRI_SOCKET
+elif hash dinitctl &> /dev/null; then
+    # Check that the user dinit daemon is running
+    if ! pgrep -u $(id -u) dinit &> /dev/null; then
+      echo "dinit user daemon is not running."
+      exit 1
+    fi
+
+    # Make sure there's no already running session.
+    if dinitctl --user is-started niri &> /dev/null; then
+      echo 'A niri session is already running.'
+      exit 1
+    fi
+
+    # Start niri
+    dinitctl --user start niri
+else
+    echo "No systemd or dinit detected, please use niri --session instead."
 fi
-
-# Reset failed state of all user units.
-systemctl --user reset-failed
-
-# Set the current desktop for xdg-desktop-portal.
-export XDG_CURRENT_DESKTOP=niri
-
-# Ensure the session type is set to Wayland for xdg-autostart apps.
-export XDG_SESSION_TYPE=wayland
-
-# Import the login manager environment.
-systemctl --user import-environment
-
-# DBus activation environment is independent from systemd. While most of
-# dbus-activated services are already using `SystemdService` directive, some
-# still don't and thus we should set the dbus environment with a separate
-# command.
-if hash dbus-update-activation-environment 2>/dev/null; then
-    dbus-update-activation-environment --all
-fi
-
-# Start niri and wait for it to terminate.
-systemctl --user --wait start niri.service
-
-# Force stop of grahical-session.target.
-systemctl --user start --job-mode=replace-irreversibly niri-shutdown.target
-
-# Unset environment that we've set.
-systemctl --user unset-environment WAYLAND_DISPLAY XDG_SESSION_TYPE XDG_CURRENT_DESKTOP

resources/niri.service

@@ -9,5 +9,6 @@ Wants=xdg-desktop-autostart.target
 Before=xdg-desktop-autostart.target
 
 [Service]
+Slice=session.slice
 Type=notify
-ExecStart=/usr/bin/niri
+ExecStart=/usr/bin/niri --session

resources/rustdoc-index.html

@@ -0,0 +1,6 @@
+<!DOCTYPE html>
+<html>
+    <head>
+        <meta http-equiv=refresh content=0;url=niri_ipc/index.html />
+    </head>
+</html>

src/animation.rs

@@ -1,53 +0,0 @@
-use std::time::Duration;
-
-use keyframe::functions::EaseOutCubic;
-use keyframe::EasingFunction;
-use portable_atomic::{AtomicF64, Ordering};
-
-use crate::utils::get_monotonic_time;
-
-pub static ANIMATION_SLOWDOWN: AtomicF64 = AtomicF64::new(1.);
-
-#[derive(Debug)]
-pub struct Animation {
-    from: f64,
-    to: f64,
-    duration: Duration,
-    start_time: Duration,
-    current_time: Duration,
-}
-
-impl Animation {
-    pub fn new(from: f64, to: f64, over: Duration) -> Self {
-        // FIXME: ideally we shouldn't use current time here because animations started within the
-        // same frame cycle should have the same start time to be synchronized.
-        let now = get_monotonic_time();
-
-        Self {
-            from,
-            to,
-            duration: over.mul_f64(ANIMATION_SLOWDOWN.load(Ordering::Relaxed)),
-            start_time: now,
-            current_time: now,
-        }
-    }
-
-    pub fn set_current_time(&mut self, time: Duration) {
-        self.current_time = time;
-    }
-
-    pub fn is_done(&self) -> bool {
-        self.current_time >= self.start_time + self.duration
-    }
-
-    pub fn value(&self) -> f64 {
-        let passed = (self.current_time - self.start_time).as_secs_f64();
-        let total = self.duration.as_secs_f64();
-        let x = (passed / total).clamp(0., 1.);
-        EaseOutCubic.y(x) * (self.to - self.from) + self.from
-    }
-
-    pub fn to(&self) -> f64 {
-        self.to
-    }
-}

src/animation/clock.rs

@@ -0,0 +1,202 @@
+use std::cell::RefCell;
+use std::rc::Rc;
+use std::time::Duration;
+
+use crate::utils::get_monotonic_time;
+
+/// Shareable lazy clock that can change rate.
+///
+/// The clock will fetch the time once and then retain it until explicitly cleared with
+/// [`Clock::clear`].
+#[derive(Debug, Default, Clone)]
+pub struct Clock {
+    inner: Rc<RefCell<AdjustableClock>>,
+}
+
+#[derive(Debug, Default)]
+struct LazyClock {
+    time: Option<Duration>,
+}
+
+/// Clock that can adjust its rate.
+#[derive(Debug)]
+struct AdjustableClock {
+    inner: LazyClock,
+    current_time: Duration,
+    last_seen_time: Duration,
+    rate: f64,
+    complete_instantly: bool,
+}
+
+impl Clock {
+    /// Creates a new clock with the given time.
+    pub fn with_time(time: Duration) -> Self {
+        let clock = AdjustableClock::new(LazyClock::with_time(time));
+        Self {
+            inner: Rc::new(RefCell::new(clock)),
+        }
+    }
+
+    /// Returns the current time.
+    pub fn now(&self) -> Duration {
+        self.inner.borrow_mut().now()
+    }
+
+    /// Returns the underlying time not adjusted for rate change.
+    pub fn now_unadjusted(&self) -> Duration {
+        self.inner.borrow_mut().inner.now()
+    }
+
+    /// Sets the unadjusted clock time.
+    pub fn set_unadjusted(&mut self, time: Duration) {
+        self.inner.borrow_mut().inner.set(time);
+    }
+
+    /// Clears the stored time so it's re-fetched again next.
+    pub fn clear(&mut self) {
+        self.inner.borrow_mut().inner.clear();
+    }
+
+    /// Gets the clock rate.
+    pub fn rate(&self) -> f64 {
+        self.inner.borrow().rate()
+    }
+
+    /// Sets the clock rate.
+    pub fn set_rate(&mut self, rate: f64) {
+        self.inner.borrow_mut().set_rate(rate);
+    }
+
+    /// Returns whether animations should complete instantly.
+    pub fn should_complete_instantly(&self) -> bool {
+        self.inner.borrow().should_complete_instantly()
+    }
+
+    /// Sets whether animations should complete instantly.
+    pub fn set_complete_instantly(&mut self, value: bool) {
+        self.inner.borrow_mut().set_complete_instantly(value);
+    }
+}
+
+impl PartialEq for Clock {
+    fn eq(&self, other: &Self) -> bool {
+        Rc::ptr_eq(&self.inner, &other.inner)
+    }
+}
+
+impl Eq for Clock {}
+
+impl LazyClock {
+    pub fn with_time(time: Duration) -> Self {
+        Self { time: Some(time) }
+    }
+
+    pub fn clear(&mut self) {
+        self.time = None;
+    }
+
+    pub fn set(&mut self, time: Duration) {
+        self.time = Some(time);
+    }
+
+    pub fn now(&mut self) -> Duration {
+        *self.time.get_or_insert_with(get_monotonic_time)
+    }
+}
+
+impl AdjustableClock {
+    pub fn new(mut inner: LazyClock) -> Self {
+        let time = inner.now();
+        Self {
+            inner,
+            current_time: time,
+            last_seen_time: time,
+            rate: 1.,
+            complete_instantly: false,
+        }
+    }
+
+    pub fn rate(&self) -> f64 {
+        self.rate
+    }
+
+    pub fn set_rate(&mut self, rate: f64) {
+        self.rate = rate.clamp(0., 1000.);
+    }
+
+    pub fn should_complete_instantly(&self) -> bool {
+        self.complete_instantly
+    }
+
+    pub fn set_complete_instantly(&mut self, value: bool) {
+        self.complete_instantly = value;
+    }
+
+    pub fn now(&mut self) -> Duration {
+        let time = self.inner.now();
+
+        if self.last_seen_time == time {
+            return self.current_time;
+        }
+
+        if self.last_seen_time < time {
+            let delta = time - self.last_seen_time;
+            let delta = delta.mul_f64(self.rate);
+            self.current_time = self.current_time.saturating_add(delta);
+        } else {
+            let delta = self.last_seen_time - time;
+            let delta = delta.mul_f64(self.rate);
+            self.current_time = self.current_time.saturating_sub(delta);
+        }
+
+        self.last_seen_time = time;
+        self.current_time
+    }
+}
+
+impl Default for AdjustableClock {
+    fn default() -> Self {
+        Self::new(LazyClock::default())
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn frozen_clock() {
+        let mut clock = Clock::with_time(Duration::ZERO);
+        assert_eq!(clock.now(), Duration::ZERO);
+
+        clock.set_unadjusted(Duration::from_millis(100));
+        assert_eq!(clock.now(), Duration::from_millis(100));
+
+        clock.set_unadjusted(Duration::from_millis(200));
+        assert_eq!(clock.now(), Duration::from_millis(200));
+    }
+
+    #[test]
+    fn rate_change() {
+        let mut clock = Clock::with_time(Duration::ZERO);
+        clock.set_rate(0.5);
+
+        clock.set_unadjusted(Duration::from_millis(100));
+        assert_eq!(clock.now_unadjusted(), Duration::from_millis(100));
+        assert_eq!(clock.now(), Duration::from_millis(50));
+
+        clock.set_unadjusted(Duration::from_millis(200));
+        assert_eq!(clock.now_unadjusted(), Duration::from_millis(200));
+        assert_eq!(clock.now(), Duration::from_millis(100));
+
+        clock.set_unadjusted(Duration::from_millis(150));
+        assert_eq!(clock.now_unadjusted(), Duration::from_millis(150));
+        assert_eq!(clock.now(), Duration::from_millis(75));
+
+        clock.set_rate(2.0);
+
+        clock.set_unadjusted(Duration::from_millis(250));
+        assert_eq!(clock.now_unadjusted(), Duration::from_millis(250));
+        assert_eq!(clock.now(), Duration::from_millis(275));
+    }
+}

src/animation/mod.rs

@@ -0,0 +1,334 @@
+use std::time::Duration;
+
+use keyframe::functions::{EaseOutCubic, EaseOutQuad};
+use keyframe::EasingFunction;
+
+mod spring;
+pub use spring::{Spring, SpringParams};
+
+mod clock;
+pub use clock::Clock;
+
+#[derive(Debug, Clone)]
+pub struct Animation {
+    from: f64,
+    to: f64,
+    initial_velocity: f64,
+    is_off: bool,
+    duration: Duration,
+    /// Time until the animation first reaches `to`.
+    ///
+    /// Best effort; not always exactly precise.
+    clamped_duration: Duration,
+    start_time: Duration,
+    clock: Clock,
+    kind: Kind,
+}
+
+#[derive(Debug, Clone, Copy)]
+enum Kind {
+    Easing {
+        curve: Curve,
+    },
+    Spring(Spring),
+    Deceleration {
+        initial_velocity: f64,
+        deceleration_rate: f64,
+    },
+}
+
+#[derive(Debug, Clone, Copy)]
+pub enum Curve {
+    Linear,
+    EaseOutQuad,
+    EaseOutCubic,
+    EaseOutExpo,
+}
+
+impl Animation {
+    pub fn new(
+        clock: Clock,
+        from: f64,
+        to: f64,
+        initial_velocity: f64,
+        config: niri_config::Animation,
+    ) -> Self {
+        // Scale the velocity by rate to keep the touchpad gestures feeling right.
+        let initial_velocity = initial_velocity / clock.rate().max(0.001);
+
+        let mut rv = Self::ease(clock, from, to, initial_velocity, 0, Curve::EaseOutCubic);
+        if config.off {
+            rv.is_off = true;
+            return rv;
+        }
+
+        rv.replace_config(config);
+        rv
+    }
+
+    pub fn replace_config(&mut self, config: niri_config::Animation) {
+        self.is_off = config.off;
+        if config.off {
+            self.duration = Duration::ZERO;
+            self.clamped_duration = Duration::ZERO;
+            return;
+        }
+
+        let start_time = self.start_time;
+
+        match config.kind {
+            niri_config::AnimationKind::Spring(p) => {
+                let params = SpringParams::new(p.damping_ratio, f64::from(p.stiffness), p.epsilon);
+
+                let spring = Spring {
+                    from: self.from,
+                    to: self.to,
+                    initial_velocity: self.initial_velocity,
+                    params,
+                };
+                *self = Self::spring(self.clock.clone(), spring);
+            }
+            niri_config::AnimationKind::Easing(p) => {
+                *self = Self::ease(
+                    self.clock.clone(),
+                    self.from,
+                    self.to,
+                    self.initial_velocity,
+                    u64::from(p.duration_ms),
+                    Curve::from(p.curve),
+                );
+            }
+        }
+
+        self.start_time = start_time;
+    }
+
+    /// Restarts the animation using the previous config.
+    pub fn restarted(&self, from: f64, to: f64, initial_velocity: f64) -> Self {
+        if self.is_off {
+            return self.clone();
+        }
+
+        // Scale the velocity by rate to keep the touchpad gestures feeling right.
+        let initial_velocity = initial_velocity / self.clock.rate().max(0.001);
+
+        match self.kind {
+            Kind::Easing { curve } => Self::ease(
+                self.clock.clone(),
+                from,
+                to,
+                initial_velocity,
+                self.duration.as_millis() as u64,
+                curve,
+            ),
+            Kind::Spring(spring) => {
+                let spring = Spring {
+                    from: self.from,
+                    to: self.to,
+                    initial_velocity: self.initial_velocity,
+                    params: spring.params,
+                };
+                Self::spring(self.clock.clone(), spring)
+            }
+            Kind::Deceleration {
+                initial_velocity,
+                deceleration_rate,
+            } => {
+                let threshold = 0.001; // FIXME
+                Self::decelerate(
+                    self.clock.clone(),
+                    from,
+                    initial_velocity,
+                    deceleration_rate,
+                    threshold,
+                )
+            }
+        }
+    }
+
+    pub fn ease(
+        clock: Clock,
+        from: f64,
+        to: f64,
+        initial_velocity: f64,
+        duration_ms: u64,
+        curve: Curve,
+    ) -> Self {
+        let duration = Duration::from_millis(duration_ms);
+        let kind = Kind::Easing { curve };
+
+        Self {
+            from,
+            to,
+            initial_velocity,
+            is_off: false,
+            duration,
+            // Our current curves never overshoot.
+            clamped_duration: duration,
+            start_time: clock.now(),
+            clock,
+            kind,
+        }
+    }
+
+    pub fn spring(clock: Clock, spring: Spring) -> Self {
+        let _span = tracy_client::span!("Animation::spring");
+
+        let duration = spring.duration();
+        let clamped_duration = spring.clamped_duration().unwrap_or(duration);
+        let kind = Kind::Spring(spring);
+
+        Self {
+            from: spring.from,
+            to: spring.to,
+            initial_velocity: spring.initial_velocity,
+            is_off: false,
+            duration,
+            clamped_duration,
+            start_time: clock.now(),
+            clock,
+            kind,
+        }
+    }
+
+    pub fn decelerate(
+        clock: Clock,
+        from: f64,
+        initial_velocity: f64,
+        deceleration_rate: f64,
+        threshold: f64,
+    ) -> Self {
+        let duration_s = if initial_velocity == 0. {
+            0.
+        } else {
+            let coeff = 1000. * deceleration_rate.ln();
+            (-coeff * threshold / initial_velocity.abs()).ln() / coeff
+        };
+        let duration = Duration::from_secs_f64(duration_s);
+
+        let to = from - initial_velocity / (1000. * deceleration_rate.ln());
+
+        let kind = Kind::Deceleration {
+            initial_velocity,
+            deceleration_rate,
+        };
+
+        Self {
+            from,
+            to,
+            initial_velocity,
+            is_off: false,
+            duration,
+            clamped_duration: duration,
+            start_time: clock.now(),
+            clock,
+            kind,
+        }
+    }
+
+    pub fn is_done(&self) -> bool {
+        if self.clock.should_complete_instantly() {
+            return true;
+        }
+
+        self.clock.now() >= self.start_time + self.duration
+    }
+
+    pub fn is_clamped_done(&self) -> bool {
+        if self.clock.should_complete_instantly() {
+            return true;
+        }
+
+        self.clock.now() >= self.start_time + self.clamped_duration
+    }
+
+    pub fn value(&self) -> f64 {
+        if self.is_done() {
+            return self.to;
+        }
+
+        let passed = self.clock.now().saturating_sub(self.start_time);
+
+        match self.kind {
+            Kind::Easing { curve } => {
+                let passed = passed.as_secs_f64();
+                let total = self.duration.as_secs_f64();
+                let x = (passed / total).clamp(0., 1.);
+                curve.y(x) * (self.to - self.from) + self.from
+            }
+            Kind::Spring(spring) => {
+                let value = spring.value_at(passed);
+
+                // Protect against numerical instability.
+                let range = (self.to - self.from) * 10.;
+                let a = self.from - range;
+                let b = self.to + range;
+                if self.from <= self.to {
+                    value.clamp(a, b)
+                } else {
+                    value.clamp(b, a)
+                }
+            }
+            Kind::Deceleration {
+                initial_velocity,
+                deceleration_rate,
+            } => {
+                let passed = passed.as_secs_f64();
+                let coeff = 1000. * deceleration_rate.ln();
+                self.from + (deceleration_rate.powf(1000. * passed) - 1.) / coeff * initial_velocity
+            }
+        }
+    }
+
+    /// Returns a value that stops at the target value after first reaching it.
+    ///
+    /// Best effort; not always exactly precise.
+    pub fn clamped_value(&self) -> f64 {
+        if self.is_clamped_done() {
+            return self.to;
+        }
+
+        self.value()
+    }
+
+    pub fn to(&self) -> f64 {
+        self.to
+    }
+
+    #[cfg(test)]
+    pub fn from(&self) -> f64 {
+        self.from
+    }
+
+    pub fn offset(&mut self, offset: f64) {
+        self.from += offset;
+        self.to += offset;
+
+        if let Kind::Spring(spring) = &mut self.kind {
+            spring.from += offset;
+            spring.to += offset;
+        }
+    }
+}
+
+impl Curve {
+    pub fn y(self, x: f64) -> f64 {
+        match self {
+            Curve::Linear => x,
+            Curve::EaseOutQuad => EaseOutQuad.y(x),
+            Curve::EaseOutCubic => EaseOutCubic.y(x),
+            Curve::EaseOutExpo => 1. - 2f64.powf(-10. * x),
+        }
+    }
+}
+
+impl From<niri_config::AnimationCurve> for Curve {
+    fn from(value: niri_config::AnimationCurve) -> Self {
+        match value {
+            niri_config::AnimationCurve::Linear => Curve::Linear,
+            niri_config::AnimationCurve::EaseOutQuad => Curve::EaseOutQuad,
+            niri_config::AnimationCurve::EaseOutCubic => Curve::EaseOutCubic,
+            niri_config::AnimationCurve::EaseOutExpo => Curve::EaseOutExpo,
+        }
+    }
+}

src/animation/spring.rs

@@ -0,0 +1,168 @@
+use std::time::Duration;
+
+#[derive(Debug, Clone, Copy)]
+pub struct SpringParams {
+    pub damping: f64,
+    pub mass: f64,
+    pub stiffness: f64,
+    pub epsilon: f64,
+}
+
+#[derive(Debug, Clone, Copy)]
+pub struct Spring {
+    pub from: f64,
+    pub to: f64,
+    pub initial_velocity: f64,
+    pub params: SpringParams,
+}
+
+impl SpringParams {
+    pub fn new(damping_ratio: f64, stiffness: f64, epsilon: f64) -> Self {
+        let damping_ratio = damping_ratio.max(0.);
+        let stiffness = stiffness.max(0.);
+        let epsilon = epsilon.max(0.);
+
+        let mass = 1.;
+        let critical_damping = 2. * (mass * stiffness).sqrt();
+        let damping = damping_ratio * critical_damping;
+
+        Self {
+            damping,
+            mass,
+            stiffness,
+            epsilon,
+        }
+    }
+}
+
+impl Spring {
+    pub fn value_at(&self, t: Duration) -> f64 {
+        self.oscillate(t.as_secs_f64())
+    }
+
+    // Based on libadwaita (LGPL-2.1-or-later):
+    // https://gitlab.gnome.org/GNOME/libadwaita/-/blob/1.4.4/src/adw-spring-animation.c,
+    // which itself is based on (MIT):
+    // https://github.com/robb/RBBAnimation/blob/master/RBBAnimation/RBBSpringAnimation.m
+    /// Computes and returns the duration until the spring is at rest.
+    pub fn duration(&self) -> Duration {
+        const DELTA: f64 = 0.001;
+
+        let beta = self.params.damping / (2. * self.params.mass);
+
+        if beta.abs() <= f64::EPSILON || beta < 0. {
+            return Duration::MAX;
+        }
+
+        let omega0 = (self.params.stiffness / self.params.mass).sqrt();
+
+        // As first ansatz for the overdamped solution,
+        // and general estimation for the oscillating ones
+        // we take the value of the envelope when it's < epsilon.
+        let mut x0 = -self.params.epsilon.ln() / beta;
+
+        // f64::EPSILON is too small for this specific comparison, so we use
+        // f32::EPSILON even though it's doubles.
+        if (beta - omega0).abs() <= f64::from(f32::EPSILON) || beta < omega0 {
+            return Duration::from_secs_f64(x0);
+        }
+
+        // Since the overdamped solution decays way slower than the envelope
+        // we need to use the value of the oscillation itself.
+        // Newton's root finding method is a good candidate in this particular case:
+        // https://en.wikipedia.org/wiki/Newton%27s_method
+        let mut y0 = self.oscillate(x0);
+        let m = (self.oscillate(x0 + DELTA) - y0) / DELTA;
+
+        let mut x1 = (self.to - y0 + m * x0) / m;
+        let mut y1 = self.oscillate(x1);
+
+        let mut i = 0;
+        while (self.to - y1).abs() > self.params.epsilon {
+            if i > 1000 {
+                return Duration::ZERO;
+            }
+
+            x0 = x1;
+            y0 = y1;
+
+            let m = (self.oscillate(x0 + DELTA) - y0) / DELTA;
+
+            x1 = (self.to - y0 + m * x0) / m;
+            y1 = self.oscillate(x1);
+            i += 1;
+        }
+
+        Duration::from_secs_f64(x1)
+    }
+
+    /// Computes and returns the duration until the spring reaches its target position.
+    pub fn clamped_duration(&self) -> Option<Duration> {
+        let beta = self.params.damping / (2. * self.params.mass);
+
+        if beta.abs() <= f64::EPSILON || beta < 0. {
+            return Some(Duration::MAX);
+        }
+
+        if (self.to - self.from).abs() <= f64::EPSILON {
+            return Some(Duration::ZERO);
+        }
+
+        // The first frame is not that important and we avoid finding the trivial 0 for in-place
+        // animations.
+        let mut i = 1u16;
+        let mut y = self.oscillate(f64::from(i) / 1000.);
+
+        while (self.to - self.from > f64::EPSILON && self.to - y > self.params.epsilon)
+            || (self.from - self.to > f64::EPSILON && y - self.to > self.params.epsilon)
+        {
+            if i > 3000 {
+                return None;
+            }
+
+            i += 1;
+            y = self.oscillate(f64::from(i) / 1000.);
+        }
+
+        Some(Duration::from_millis(u64::from(i)))
+    }
+
+    /// Returns the spring position at a given time in seconds.
+    fn oscillate(&self, t: f64) -> f64 {
+        let b = self.params.damping;
+        let m = self.params.mass;
+        let k = self.params.stiffness;
+        let v0 = self.initial_velocity;
+
+        let beta = b / (2. * m);
+        let omega0 = (k / m).sqrt();
+
+        let x0 = self.from - self.to;
+
+        let envelope = (-beta * t).exp();
+
+        // Solutions of the form C1*e^(lambda1*x) + C2*e^(lambda2*x)
+        // for the differential equation m*ẍ+b*ẋ+kx = 0
+
+        // f64::EPSILON is too small for this specific comparison, so we use
+        // f32::EPSILON even though it's doubles.
+        if (beta - omega0).abs() <= f64::from(f32::EPSILON) {
+            // Critically damped.
+            self.to + envelope * (x0 + (beta * x0 + v0) * t)
+        } else if beta < omega0 {
+            // Underdamped.
+            let omega1 = ((omega0 * omega0) - (beta * beta)).sqrt();
+
+            self.to
+                + envelope
+                    * (x0 * (omega1 * t).cos() + ((beta * x0 + v0) / omega1) * (omega1 * t).sin())
+        } else {
+            // Overdamped.
+            let omega2 = ((beta * beta) - (omega0 * omega0)).sqrt();
+
+            self.to
+                + envelope
+                    * (x0 * (omega2 * t).cosh() + ((beta * x0 + v0) / omega2) * (omega2 * t).sinh())
+        }
+    }
+}

src/backend/headless.rs

@@ -0,0 +1,140 @@
+//! Headless backend for tests.
+//!
+//! This can eventually grow into a more complete backend if needed, but for now it's missing some
+//! crucial parts like rendering.
+
+use std::mem;
+use std::sync::{Arc, Mutex};
+
+use niri_config::OutputName;
+use smithay::backend::allocator::dmabuf::Dmabuf;
+use smithay::backend::renderer::element::RenderElementStates;
+use smithay::backend::renderer::gles::GlesRenderer;
+use smithay::output::{Mode, Output, PhysicalProperties, Subpixel};
+use smithay::reexports::wayland_protocols::wp::presentation_time::server::wp_presentation_feedback;
+use smithay::utils::Size;
+use smithay::wayland::presentation::Refresh;
+
+use super::{IpcOutputMap, OutputId, RenderResult};
+use crate::niri::{Niri, RedrawState};
+use crate::utils::{get_monotonic_time, logical_output};
+
+pub struct Headless {
+    ipc_outputs: Arc<Mutex<IpcOutputMap>>,
+}
+
+impl Headless {
+    pub fn new() -> Self {
+        Self {
+            ipc_outputs: Default::default(),
+        }
+    }
+
+    pub fn init(&mut self, _niri: &mut Niri) {}
+
+    pub fn add_output(&mut self, niri: &mut Niri, n: u8, size: (u16, u16)) {
+        let connector = format!("headless-{n}");
+        let make = "niri".to_string();
+        let model = "headless".to_string();
+        let serial = n.to_string();
+
+        let output = Output::new(
+            connector.clone(),
+            PhysicalProperties {
+                size: (0, 0).into(),
+                subpixel: Subpixel::Unknown,
+                make: make.clone(),
+                model: model.clone(),
+            },
+        );
+
+        let mode = Mode {
+            size: Size::from((i32::from(size.0), i32::from(size.1))),
+            refresh: 60_000,
+        };
+        output.change_current_state(Some(mode), None, None, None);
+        output.set_preferred(mode);
+
+        output.user_data().insert_if_missing(|| OutputName {
+            connector,
+            make: Some(make),
+            model: Some(model),
+            serial: Some(serial),
+        });
+
+        let physical_properties = output.physical_properties();
+        self.ipc_outputs.lock().unwrap().insert(
+            OutputId::next(),
+            niri_ipc::Output {
+                name: output.name(),
+                make: physical_properties.make,
+                model: physical_properties.model,
+                serial: None,
+                physical_size: None,
+                modes: vec![niri_ipc::Mode {
+                    width: size.0,
+                    height: size.1,
+                    refresh_rate: 60_000,
+                    is_preferred: true,
+                }],
+                current_mode: Some(0),
+                vrr_supported: false,
+                vrr_enabled: false,
+                logical: Some(logical_output(&output)),
+            },
+        );
+
+        niri.add_output(output, None, false);
+    }
+
+    pub fn seat_name(&self) -> String {
+        "headless".to_owned()
+    }
+
+    pub fn with_primary_renderer<T>(
+        &mut self,
+        _f: impl FnOnce(&mut GlesRenderer) -> T,
+    ) -> Option<T> {
+        None
+    }
+
+    pub fn render(&mut self, niri: &mut Niri, output: &Output) -> RenderResult {
+        let states = RenderElementStates::default();
+        let mut presentation_feedbacks = niri.take_presentation_feedbacks(output, &states);
+        presentation_feedbacks.presented::<_, smithay::utils::Monotonic>(
+            get_monotonic_time(),
+            Refresh::Unknown,
+            0,
+            wp_presentation_feedback::Kind::empty(),
+        );
+
+        let output_state = niri.output_state.get_mut(output).unwrap();
+        match mem::replace(&mut output_state.redraw_state, RedrawState::Idle) {
+            RedrawState::Idle => unreachable!(),
+            RedrawState::Queued => (),
+            RedrawState::WaitingForVBlank { .. } => unreachable!(),
+            RedrawState::WaitingForEstimatedVBlank(_) => unreachable!(),
+            RedrawState::WaitingForEstimatedVBlankAndQueued(_) => unreachable!(),
+        }
+
+        output_state.frame_callback_sequence = output_state.frame_callback_sequence.wrapping_add(1);
+
+        // FIXME: request redraw on unfinished animations remain
+
+        RenderResult::Submitted
+    }
+
+    pub fn import_dmabuf(&mut self, _dmabuf: &Dmabuf) -> bool {
+        unimplemented!()
+    }
+
+    pub fn ipc_outputs(&self) -> Arc<Mutex<IpcOutputMap>> {
+        self.ipc_outputs.clone()
+    }
+}
+
+impl Default for Headless {
+    fn default() -> Self {
+        Self::new()
+    }
+}

src/backend/mod.rs

@@ -2,12 +2,14 @@ use std::collections::HashMap;
 use std::sync::{Arc, Mutex};
 use std::time::Duration;
 
+use smithay::backend::allocator::dmabuf::Dmabuf;
 use smithay::backend::renderer::gles::GlesRenderer;
 use smithay::output::Output;
+use smithay::reexports::wayland_server::protocol::wl_surface::WlSurface;
 
 use crate::input::CompositorMod;
-use crate::niri::OutputRenderElements;
-use crate::Niri;
+use crate::niri::Niri;
+use crate::utils::id::IdCounter;
 
 pub mod tty;
 pub use tty::Tty;
@@ -15,9 +17,13 @@ pub use tty::Tty;
 pub mod winit;
 pub use winit::Winit;
 
+pub mod headless;
+pub use headless::Headless;
+
 pub enum Backend {
     Tty(Tty),
     Winit(Winit),
+    Headless(Headless),
 }
 
 #[derive(PartialEq, Eq)]
@@ -26,8 +32,25 @@ pub enum RenderResult {
     Submitted,
     /// Rendering succeeded, but there was no damage.
     NoDamage,
-    /// An error has occurred, the frame was not submitted.
-    Error,
+    /// The frame was not rendered and submitted, due to an error or otherwise.
+    Skipped,
+}
+
+pub type IpcOutputMap = HashMap<OutputId, niri_ipc::Output>;
+
+static OUTPUT_ID_COUNTER: IdCounter = IdCounter::new();
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub struct OutputId(u64);
+
+impl OutputId {
+    fn next() -> OutputId {
+        OutputId(OUTPUT_ID_COUNTER.next())
+    }
+
+    pub fn get(self) -> u64 {
+        self.0
+    }
 }
 
 impl Backend {
@@ -35,6 +58,7 @@ impl Backend {
         match self {
             Backend::Tty(tty) => tty.init(niri),
             Backend::Winit(winit) => winit.init(niri),
+            Backend::Headless(headless) => headless.init(niri),
         }
     }
 
@@ -42,13 +66,18 @@ impl Backend {
         match self {
             Backend::Tty(tty) => tty.seat_name(),
             Backend::Winit(winit) => winit.seat_name(),
+            Backend::Headless(headless) => headless.seat_name(),
         }
     }
 
-    pub fn renderer(&mut self) -> Option<&mut GlesRenderer> {
+    pub fn with_primary_renderer<T>(
+        &mut self,
+        f: impl FnOnce(&mut GlesRenderer) -> T,
+    ) -> Option<T> {
         match self {
-            Backend::Tty(tty) => tty.renderer(),
-            Backend::Winit(winit) => Some(winit.renderer()),
+            Backend::Tty(tty) => tty.with_primary_renderer(f),
+            Backend::Winit(winit) => winit.with_primary_renderer(f),
+            Backend::Headless(headless) => headless.with_primary_renderer(f),
         }
     }
 
@@ -56,12 +85,12 @@ impl Backend {
         &mut self,
         niri: &mut Niri,
         output: &Output,
-        elements: &[OutputRenderElements<GlesRenderer>],
         target_presentation_time: Duration,
     ) -> RenderResult {
         match self {
-            Backend::Tty(tty) => tty.render(niri, output, elements, target_presentation_time),
-            Backend::Winit(winit) => winit.render(niri, output, elements),
+            Backend::Tty(tty) => tty.render(niri, output, target_presentation_time),
+            Backend::Winit(winit) => winit.render(niri, output),
+            Backend::Headless(headless) => headless.render(niri, output),
         }
     }
 
@@ -69,6 +98,7 @@ impl Backend {
         match self {
             Backend::Tty(_) => CompositorMod::Super,
             Backend::Winit(_) => CompositorMod::Alt,
+            Backend::Headless(_) => CompositorMod::Super,
         }
     }
 
@@ -76,6 +106,7 @@ impl Backend {
         match self {
             Backend::Tty(tty) => tty.change_vt(vt),
             Backend::Winit(_) => (),
+            Backend::Headless(_) => (),
         }
     }
 
@@ -83,6 +114,7 @@ impl Backend {
         match self {
             Backend::Tty(tty) => tty.suspend(),
             Backend::Winit(_) => (),
+            Backend::Headless(_) => (),
         }
     }
 
@@ -90,14 +122,31 @@ impl Backend {
         match self {
             Backend::Tty(tty) => tty.toggle_debug_tint(),
             Backend::Winit(winit) => winit.toggle_debug_tint(),
+            Backend::Headless(_) => (),
         }
     }
 
-    #[cfg_attr(not(feature = "dbus"), allow(unused))]
-    pub fn connectors(&self) -> Arc<Mutex<HashMap<String, Output>>> {
+    pub fn import_dmabuf(&mut self, dmabuf: &Dmabuf) -> bool {
         match self {
-            Backend::Tty(tty) => tty.connectors(),
-            Backend::Winit(winit) => winit.connectors(),
+            Backend::Tty(tty) => tty.import_dmabuf(dmabuf),
+            Backend::Winit(winit) => winit.import_dmabuf(dmabuf),
+            Backend::Headless(headless) => headless.import_dmabuf(dmabuf),
+        }
+    }
+
+    pub fn early_import(&mut self, surface: &WlSurface) {
+        match self {
+            Backend::Tty(tty) => tty.early_import(surface),
+            Backend::Winit(_) => (),
+            Backend::Headless(_) => (),
+        }
+    }
+
+    pub fn ipc_outputs(&self) -> Arc<Mutex<IpcOutputMap>> {
+        match self {
+            Backend::Tty(tty) => tty.ipc_outputs(),
+            Backend::Winit(winit) => winit.ipc_outputs(),
+            Backend::Headless(headless) => headless.ipc_outputs(),
         }
     }
 
@@ -107,22 +156,41 @@ impl Backend {
     ) -> Option<smithay::backend::allocator::gbm::GbmDevice<smithay::backend::drm::DrmDeviceFd>>
     {
         match self {
-            Backend::Tty(tty) => tty.gbm_device(),
+            Backend::Tty(tty) => tty.primary_gbm_device(),
             Backend::Winit(_) => None,
+            Backend::Headless(_) => None,
         }
     }
 
-    pub fn is_active(&self) -> bool {
-        match self {
-            Backend::Tty(tty) => tty.is_active(),
-            Backend::Winit(_) => true,
-        }
-    }
-
-    pub fn set_monitors_active(&self, active: bool) {
+    pub fn set_monitors_active(&mut self, active: bool) {
         match self {
             Backend::Tty(tty) => tty.set_monitors_active(active),
             Backend::Winit(_) => (),
+            Backend::Headless(_) => (),
+        }
+    }
+
+    pub fn set_output_on_demand_vrr(&mut self, niri: &mut Niri, output: &Output, enable_vrr: bool) {
+        match self {
+            Backend::Tty(tty) => tty.set_output_on_demand_vrr(niri, output, enable_vrr),
+            Backend::Winit(_) => (),
+            Backend::Headless(_) => (),
+        }
+    }
+
+    pub fn on_output_config_changed(&mut self, niri: &mut Niri) {
+        match self {
+            Backend::Tty(tty) => tty.on_output_config_changed(niri),
+            Backend::Winit(_) => (),
+            Backend::Headless(_) => (),
+        }
+    }
+
+    pub fn tty_checked(&mut self) -> Option<&mut Tty> {
+        if let Self::Tty(v) = self {
+            Some(v)
+        } else {
+            None
         }
     }
 
@@ -141,4 +209,12 @@ impl Backend {
             panic!("backend is not Winit")
         }
     }
+
+    pub fn headless(&mut self) -> &mut Headless {
+        if let Self::Headless(v) = self {
+            v
+        } else {
+            panic!("backend is not Headless")
+        }
+    }
 }

src/backend/winit.rs

@@ -3,48 +3,44 @@ use std::collections::HashMap;
 use std::mem;
 use std::rc::Rc;
 use std::sync::{Arc, Mutex};
-use std::time::Duration;
 
+use niri_config::{Config, OutputName};
+use smithay::backend::allocator::dmabuf::Dmabuf;
 use smithay::backend::renderer::damage::OutputDamageTracker;
 use smithay::backend::renderer::gles::GlesRenderer;
-use smithay::backend::renderer::{DebugFlags, Renderer};
+use smithay::backend::renderer::{DebugFlags, ImportDma, ImportEgl, Renderer};
 use smithay::backend::winit::{self, WinitEvent, WinitGraphicsBackend};
-use smithay::output::{Mode, Output, PhysicalProperties, Scale, Subpixel};
+use smithay::output::{Mode, Output, PhysicalProperties, Subpixel};
 use smithay::reexports::calloop::LoopHandle;
 use smithay::reexports::wayland_protocols::wp::presentation_time::server::wp_presentation_feedback;
 use smithay::reexports::winit::dpi::LogicalSize;
-use smithay::reexports::winit::window::WindowBuilder;
-use smithay::utils::Transform;
+use smithay::reexports::winit::window::Window;
+use smithay::wayland::presentation::Refresh;
 
-use super::RenderResult;
-use crate::config::Config;
-use crate::niri::{OutputRenderElements, RedrawState, State};
-use crate::utils::get_monotonic_time;
-use crate::Niri;
+use super::{IpcOutputMap, OutputId, RenderResult};
+use crate::niri::{Niri, RedrawState, State};
+use crate::render_helpers::debug::draw_damage;
+use crate::render_helpers::{resources, shaders, RenderTarget};
+use crate::utils::{get_monotonic_time, logical_output};
 
 pub struct Winit {
     config: Rc<RefCell<Config>>,
     output: Output,
     backend: WinitGraphicsBackend<GlesRenderer>,
     damage_tracker: OutputDamageTracker,
-    connectors: Arc<Mutex<HashMap<String, Output>>>,
+    ipc_outputs: Arc<Mutex<IpcOutputMap>>,
 }
 
 impl Winit {
-    pub fn new(config: Rc<RefCell<Config>>, event_loop: LoopHandle<State>) -> Self {
-        let builder = WindowBuilder::new()
+    pub fn new(
+        config: Rc<RefCell<Config>>,
+        event_loop: LoopHandle<State>,
+    ) -> Result<Self, winit::Error> {
+        let builder = Window::default_attributes()
             .with_inner_size(LogicalSize::new(1280.0, 800.0))
             // .with_resizable(false)
             .with_title("niri");
-        let (backend, winit) = winit::init_from_builder(builder).unwrap();
-
-        let output_config = config
-            .borrow()
-            .outputs
-            .iter()
-            .find(|o| o.name == "winit")
-            .cloned()
-            .unwrap_or_default();
+        let (backend, winit) = winit::init_from_attributes(builder)?;
 
         let output = Output::new(
             "winit".to_string(),
@@ -60,18 +56,36 @@ impl Winit {
             size: backend.window_size(),
             refresh: 60_000,
         };
-        let scale = output_config.scale.clamp(1., 10.).ceil() as i32;
-        output.change_current_state(
-            Some(mode),
-            Some(Transform::Flipped180),
-            Some(Scale::Integer(scale)),
-            None,
-        );
+        output.change_current_state(Some(mode), None, None, None);
         output.set_preferred(mode);
 
-        let connectors = Arc::new(Mutex::new(HashMap::from([(
-            "winit".to_owned(),
-            output.clone(),
+        output.user_data().insert_if_missing(|| OutputName {
+            connector: "winit".to_string(),
+            make: Some("Smithay".to_string()),
+            model: Some("Winit".to_string()),
+            serial: None,
+        });
+
+        let physical_properties = output.physical_properties();
+        let ipc_outputs = Arc::new(Mutex::new(HashMap::from([(
+            OutputId::next(),
+            niri_ipc::Output {
+                name: output.name(),
+                make: physical_properties.make,
+                model: physical_properties.model,
+                serial: None,
+                physical_size: None,
+                modes: vec![niri_ipc::Mode {
+                    width: backend.window_size().w.clamp(0, u16::MAX as i32) as u16,
+                    height: backend.window_size().h.clamp(0, u16::MAX as i32) as u16,
+                    refresh_rate: 60_000,
+                    is_preferred: true,
+                }],
+                current_mode: Some(0),
+                vrr_supported: false,
+                vrr_enabled: false,
+                logical: Some(logical_output(&output)),
+            },
         )])));
 
         let damage_tracker = OutputDamageTracker::from_output(&output);
@@ -89,65 +103,98 @@ impl Winit {
                         None,
                         None,
                     );
-                    state.niri.output_resized(winit.output.clone());
+
+                    {
+                        let mut ipc_outputs = winit.ipc_outputs.lock().unwrap();
+                        let output = ipc_outputs.values_mut().next().unwrap();
+                        let mode = &mut output.modes[0];
+                        mode.width = size.w.clamp(0, u16::MAX as i32) as u16;
+                        mode.height = size.h.clamp(0, u16::MAX as i32) as u16;
+                        if let Some(logical) = output.logical.as_mut() {
+                            logical.width = size.w as u32;
+                            logical.height = size.h as u32;
+                        }
+                        state.niri.ipc_outputs_changed = true;
+                    }
+
+                    state.niri.output_resized(&winit.output);
                 }
                 WinitEvent::Input(event) => state.process_input_event(event),
                 WinitEvent::Focus(_) => (),
-                WinitEvent::Redraw => state
-                    .niri
-                    .queue_redraw(state.backend.winit().output.clone()),
-                WinitEvent::CloseRequested => {
-                    state.niri.stop_signal.stop();
-                    state.niri.remove_output(&state.backend.winit().output);
-                }
+                WinitEvent::Redraw => state.niri.queue_redraw(&state.backend.winit().output),
+                WinitEvent::CloseRequested => state.niri.stop_signal.stop(),
             })
             .unwrap();
 
-        Self {
+        Ok(Self {
             config,
             output,
             backend,
             damage_tracker,
-            connectors,
-        }
+            ipc_outputs,
+        })
     }
 
     pub fn init(&mut self, niri: &mut Niri) {
-        // For some reason, binding the display here causes damage tracker artifacts.
-        //
-        // use smithay::backend::renderer::ImportEgl;
-        //
-        // if let Err(err) = self
-        //     .backend
-        //     .renderer()
-        //     .bind_wl_display(&niri.display_handle)
-        // {
-        //     warn!("error binding renderer wl_display: {err}");
-        // }
-        niri.add_output(self.output.clone(), None);
+        let renderer = self.backend.renderer();
+        if let Err(err) = renderer.bind_wl_display(&niri.display_handle) {
+            warn!("error binding renderer wl_display: {err}");
+        }
+
+        resources::init(renderer);
+        shaders::init(renderer);
+
+        let config = self.config.borrow();
+        if let Some(src) = config.animations.window_resize.custom_shader.as_deref() {
+            shaders::set_custom_resize_program(renderer, Some(src));
+        }
+        if let Some(src) = config.animations.window_close.custom_shader.as_deref() {
+            shaders::set_custom_close_program(renderer, Some(src));
+        }
+        if let Some(src) = config.animations.window_open.custom_shader.as_deref() {
+            shaders::set_custom_open_program(renderer, Some(src));
+        }
+        drop(config);
+
+        niri.layout.update_shaders();
+
+        niri.add_output(self.output.clone(), None, false);
     }
 
     pub fn seat_name(&self) -> String {
         "winit".to_owned()
     }
 
-    pub fn renderer(&mut self) -> &mut GlesRenderer {
-        self.backend.renderer()
+    pub fn with_primary_renderer<T>(
+        &mut self,
+        f: impl FnOnce(&mut GlesRenderer) -> T,
+    ) -> Option<T> {
+        Some(f(self.backend.renderer()))
     }
 
-    pub fn render(
-        &mut self,
-        niri: &mut Niri,
-        output: &Output,
-        elements: &[OutputRenderElements<GlesRenderer>],
-    ) -> RenderResult {
+    pub fn render(&mut self, niri: &mut Niri, output: &Output) -> RenderResult {
         let _span = tracy_client::span!("Winit::render");
 
+        // Render the elements.
+        let mut elements = niri.render::<GlesRenderer>(
+            self.backend.renderer(),
+            output,
+            true,
+            RenderTarget::Output,
+        );
+
+        // Visualize the damage, if enabled.
+        if niri.debug_draw_damage {
+            let output_state = niri.output_state.get_mut(output).unwrap();
+            draw_damage(&mut output_state.debug_damage_tracker, &mut elements);
+        }
+
+        // Hand them over to winit.
         self.backend.bind().unwrap();
         let age = self.backend.buffer_age().unwrap();
         let res = self
             .damage_tracker
-            .render_output(self.backend.renderer(), age, elements, [0.; 4])
+            .render_output(self.backend.renderer(), age, &elements, [0.; 4])
             .unwrap();
 
         niri.update_primary_scanout_output(output, &res.states);
@@ -161,17 +208,17 @@ impl Winit {
                 .wait_for_frame_completion_before_queueing
             {
                 let _span = tracy_client::span!("wait for completion");
-                res.sync.wait();
+                if let Err(err) = res.sync.wait() {
+                    warn!("error waiting for frame completion: {err:?}");
+                }
             }
 
-            self.backend.submit(Some(&damage)).unwrap();
+            self.backend.submit(Some(damage)).unwrap();
 
             let mut presentation_feedbacks = niri.take_presentation_feedbacks(output, &res.states);
-            let mode = output.current_mode().unwrap();
-            let refresh = Duration::from_secs_f64(1_000f64 / mode.refresh as f64);
             presentation_feedbacks.presented::<_, smithay::utils::Monotonic>(
                 get_monotonic_time(),
-                refresh,
+                Refresh::Unknown,
                 0,
                 wp_presentation_feedback::Kind::empty(),
             );
@@ -184,12 +231,16 @@ impl Winit {
         let output_state = niri.output_state.get_mut(output).unwrap();
         match mem::replace(&mut output_state.redraw_state, RedrawState::Idle) {
             RedrawState::Idle => unreachable!(),
-            RedrawState::Queued(_) => (),
+            RedrawState::Queued => (),
             RedrawState::WaitingForVBlank { .. } => unreachable!(),
             RedrawState::WaitingForEstimatedVBlank(_) => unreachable!(),
             RedrawState::WaitingForEstimatedVBlankAndQueued(_) => unreachable!(),
         }
 
+        output_state.frame_callback_sequence = output_state.frame_callback_sequence.wrapping_add(1);
+
+        // FIXME: this should wait until a frame callback from the host compositor, but it redraws
+        // right away instead.
         if output_state.unfinished_animations_remain {
             self.backend.window().request_redraw();
         }
@@ -202,7 +253,17 @@ impl Winit {
         renderer.set_debug_flags(renderer.debug_flags() ^ DebugFlags::TINT);
     }
 
-    pub fn connectors(&self) -> Arc<Mutex<HashMap<String, Output>>> {
-        self.connectors.clone()
+    pub fn import_dmabuf(&mut self, dmabuf: &Dmabuf) -> bool {
+        match self.backend.renderer().import_dmabuf(dmabuf, None) {
+            Ok(_texture) => true,
+            Err(err) => {
+                debug!("error importing dmabuf: {err:?}");
+                false
+            }
+        }
+    }
+
+    pub fn ipc_outputs(&self) -> Arc<Mutex<IpcOutputMap>> {
+        self.ipc_outputs.clone()
     }
 }

src/cli.rs

@@ -0,0 +1,101 @@
+use std::ffi::OsString;
+use std::path::PathBuf;
+
+use clap::{Parser, Subcommand};
+use niri_ipc::{Action, OutputAction};
+
+use crate::utils::version;
+
+#[derive(Parser)]
+#[command(author, version = version(), about, long_about = None)]
+#[command(args_conflicts_with_subcommands = true)]
+#[command(subcommand_value_name = "SUBCOMMAND")]
+#[command(subcommand_help_heading = "Subcommands")]
+pub struct Cli {
+    /// Path to config file (default: `$XDG_CONFIG_HOME/niri/config.kdl`).
+    ///
+    /// This can also be set with the `NIRI_CONFIG` environment variable. If both are set, the
+    /// command line argument takes precedence.
+    #[arg(short, long)]
+    pub config: Option<PathBuf>,
+    /// Import environment globally to systemd and D-Bus, run D-Bus services.
+    ///
+    /// Set this flag in a systemd service started by your display manager, or when running
+    /// manually as your main compositor instance. Do not set when running as a nested window, or
+    /// on a TTY as your non-main compositor instance, to avoid messing up the global environment.
+    #[arg(long)]
+    pub session: bool,
+    /// Command to run upon compositor startup.
+    #[arg(last = true)]
+    pub command: Vec<OsString>,
+
+    #[command(subcommand)]
+    pub subcommand: Option<Sub>,
+}
+
+#[derive(Subcommand)]
+pub enum Sub {
+    /// Communicate with the running niri instance.
+    Msg {
+        #[command(subcommand)]
+        msg: Msg,
+        /// Format output as JSON.
+        #[arg(short, long)]
+        json: bool,
+    },
+    /// Validate the config file.
+    Validate {
+        /// Path to config file (default: `$XDG_CONFIG_HOME/niri/config.kdl`).
+        ///
+        /// This can also be set with the `NIRI_CONFIG` environment variable. If both are set, the
+        /// command line argument takes precedence.
+        #[arg(short, long)]
+        config: Option<PathBuf>,
+    },
+    /// Cause a panic to check if the backtraces are good.
+    Panic,
+}
+
+#[derive(Subcommand)]
+pub enum Msg {
+    /// List connected outputs.
+    Outputs,
+    /// List workspaces.
+    Workspaces,
+    /// List open windows.
+    Windows,
+    /// List open layer-shell surfaces.
+    Layers,
+    /// Get the configured keyboard layouts.
+    KeyboardLayouts,
+    /// Print information about the focused output.
+    FocusedOutput,
+    /// Print information about the focused window.
+    FocusedWindow,
+    /// Perform an action.
+    Action {
+        #[command(subcommand)]
+        action: Action,
+    },
+    /// Change output configuration temporarily.
+    ///
+    /// The configuration is changed temporarily and not saved into the config file. If the output
+    /// configuration subsequently changes in the config file, these temporary changes will be
+    /// forgotten.
+    Output {
+        /// Output name.
+        ///
+        /// Run `niri msg outputs` to see the output names.
+        #[arg()]
+        output: String,
+        /// Configuration to apply.
+        #[command(subcommand)]
+        action: OutputAction,
+    },
+    /// Start continuously receiving events from the compositor.
+    EventStream,
+    /// Print the version of the running niri instance.
+    Version,
+    /// Request an error from the running niri instance.
+    RequestError,
+}

src/config.rs

@@ -1,816 +0,0 @@
-use std::path::PathBuf;
-use std::str::FromStr;
-
-use bitflags::bitflags;
-use directories::ProjectDirs;
-use miette::{miette, Context, IntoDiagnostic};
-use smithay::input::keyboard::keysyms::KEY_NoSymbol;
-use smithay::input::keyboard::xkb::{keysym_from_name, KEYSYM_CASE_INSENSITIVE};
-use smithay::input::keyboard::{Keysym, XkbConfig};
-
-#[derive(knuffel::Decode, Debug, PartialEq)]
-pub struct Config {
-    #[knuffel(child, default)]
-    pub input: Input,
-    #[knuffel(children(name = "output"))]
-    pub outputs: Vec<Output>,
-    #[knuffel(children(name = "spawn-at-startup"))]
-    pub spawn_at_startup: Vec<SpawnAtStartup>,
-    #[knuffel(child, default)]
-    pub focus_ring: FocusRing,
-    #[knuffel(child, default)]
-    pub prefer_no_csd: bool,
-    #[knuffel(child, default)]
-    pub cursor: Cursor,
-    #[knuffel(child, unwrap(children), default)]
-    pub preset_column_widths: Vec<PresetWidth>,
-    #[knuffel(child)]
-    pub default_column_width: Option<DefaultColumnWidth>,
-    #[knuffel(child, unwrap(argument), default = 16)]
-    pub gaps: u16,
-    #[knuffel(child, default)]
-    pub struts: Struts,
-    #[knuffel(
-        child,
-        unwrap(argument),
-        default = Some(String::from(
-            "~/Pictures/Screenshots/Screenshot from %Y-%m-%d %H-%M-%S.png"
-        )))
-    ]
-    pub screenshot_path: Option<String>,
-    #[knuffel(child, default)]
-    pub binds: Binds,
-    #[knuffel(child, default)]
-    pub debug: DebugConfig,
-}
-
-// FIXME: Add other devices.
-#[derive(knuffel::Decode, Debug, Default, PartialEq)]
-pub struct Input {
-    #[knuffel(child, default)]
-    pub keyboard: Keyboard,
-    #[knuffel(child, default)]
-    pub touchpad: Touchpad,
-    #[knuffel(child, default)]
-    pub tablet: Tablet,
-}
-
-#[derive(knuffel::Decode, Debug, Default, PartialEq, Eq)]
-pub struct Keyboard {
-    #[knuffel(child, default)]
-    pub xkb: Xkb,
-    // The defaults were chosen to match wlroots and sway.
-    #[knuffel(child, unwrap(argument), default = 600)]
-    pub repeat_delay: u16,
-    #[knuffel(child, unwrap(argument), default = 25)]
-    pub repeat_rate: u8,
-    #[knuffel(child, unwrap(argument), default)]
-    pub track_layout: TrackLayout,
-}
-
-#[derive(knuffel::Decode, Debug, Default, PartialEq, Eq, Clone)]
-pub struct Xkb {
-    #[knuffel(child, unwrap(argument), default)]
-    pub rules: String,
-    #[knuffel(child, unwrap(argument), default)]
-    pub model: String,
-    #[knuffel(child, unwrap(argument))]
-    pub layout: Option<String>,
-    #[knuffel(child, unwrap(argument), default)]
-    pub variant: String,
-    #[knuffel(child, unwrap(argument))]
-    pub options: Option<String>,
-}
-
-impl Xkb {
-    pub fn to_xkb_config(&self) -> XkbConfig {
-        XkbConfig {
-            rules: &self.rules,
-            model: &self.model,
-            layout: self.layout.as_deref().unwrap_or("us"),
-            variant: &self.variant,
-            options: self.options.clone(),
-        }
-    }
-}
-
-#[derive(knuffel::DecodeScalar, Debug, Default, PartialEq, Eq)]
-pub enum TrackLayout {
-    /// The layout change is global.
-    #[default]
-    Global,
-    /// The layout change is window local.
-    Window,
-}
-
-// FIXME: Add the rest of the settings.
-#[derive(knuffel::Decode, Debug, Default, PartialEq)]
-pub struct Touchpad {
-    #[knuffel(child)]
-    pub tap: bool,
-    #[knuffel(child)]
-    pub natural_scroll: bool,
-    #[knuffel(child, unwrap(argument), default)]
-    pub accel_speed: f64,
-}
-
-#[derive(knuffel::Decode, Debug, Default, PartialEq)]
-pub struct Tablet {
-    #[knuffel(child, unwrap(argument))]
-    pub map_to_output: Option<String>,
-}
-
-#[derive(knuffel::Decode, Debug, Clone, PartialEq)]
-pub struct Output {
-    #[knuffel(child)]
-    pub off: bool,
-    #[knuffel(argument)]
-    pub name: String,
-    #[knuffel(child, unwrap(argument), default = 1.)]
-    pub scale: f64,
-    #[knuffel(child)]
-    pub position: Option<Position>,
-    #[knuffel(child, unwrap(argument, str))]
-    pub mode: Option<Mode>,
-}
-
-impl Default for Output {
-    fn default() -> Self {
-        Self {
-            off: false,
-            name: String::new(),
-            scale: 1.,
-            position: None,
-            mode: None,
-        }
-    }
-}
-
-#[derive(knuffel::Decode, Debug, Clone, PartialEq, Eq)]
-pub struct Position {
-    #[knuffel(property)]
-    pub x: i32,
-    #[knuffel(property)]
-    pub y: i32,
-}
-
-#[derive(Debug, Clone, PartialEq)]
-pub struct Mode {
-    pub width: u16,
-    pub height: u16,
-    pub refresh: Option<f64>,
-}
-
-#[derive(knuffel::Decode, Debug, Clone, PartialEq, Eq)]
-pub struct SpawnAtStartup {
-    #[knuffel(arguments)]
-    pub command: Vec<String>,
-}
-
-#[derive(knuffel::Decode, Debug, Clone, Copy, PartialEq)]
-pub struct FocusRing {
-    #[knuffel(child)]
-    pub off: bool,
-    #[knuffel(child, unwrap(argument), default = 4)]
-    pub width: u16,
-    #[knuffel(child, default = Color::new(127, 200, 255, 255))]
-    pub active_color: Color,
-    #[knuffel(child, default = Color::new(80, 80, 80, 255))]
-    pub inactive_color: Color,
-}
-
-impl Default for FocusRing {
-    fn default() -> Self {
-        Self {
-            off: false,
-            width: 4,
-            active_color: Color::new(127, 200, 255, 255),
-            inactive_color: Color::new(80, 80, 80, 255),
-        }
-    }
-}
-
-#[derive(knuffel::Decode, Debug, Default, Clone, Copy, PartialEq, Eq)]
-pub struct Color {
-    #[knuffel(argument)]
-    pub r: u8,
-    #[knuffel(argument)]
-    pub g: u8,
-    #[knuffel(argument)]
-    pub b: u8,
-    #[knuffel(argument)]
-    pub a: u8,
-}
-
-impl Color {
-    pub fn new(r: u8, g: u8, b: u8, a: u8) -> Self {
-        Self { r, g, b, a }
-    }
-}
-
-impl From<Color> for [f32; 4] {
-    fn from(c: Color) -> Self {
-        [c.r, c.g, c.b, c.a].map(|x| x as f32 / 255.)
-    }
-}
-
-#[derive(knuffel::Decode, Debug, PartialEq)]
-pub struct Cursor {
-    #[knuffel(child, unwrap(argument), default = String::from("default"))]
-    pub xcursor_theme: String,
-    #[knuffel(child, unwrap(argument), default = 24)]
-    pub xcursor_size: u8,
-}
-
-impl Default for Cursor {
-    fn default() -> Self {
-        Self {
-            xcursor_theme: String::from("default"),
-            xcursor_size: 24,
-        }
-    }
-}
-
-#[derive(knuffel::Decode, Debug, Clone, Copy, PartialEq)]
-pub enum PresetWidth {
-    Proportion(#[knuffel(argument)] f64),
-    Fixed(#[knuffel(argument)] i32),
-}
-
-#[derive(knuffel::Decode, Debug, Clone, PartialEq)]
-pub struct DefaultColumnWidth(#[knuffel(children)] pub Vec<PresetWidth>);
-
-#[derive(knuffel::Decode, Debug, Default, Clone, Copy, PartialEq, Eq)]
-pub struct Struts {
-    #[knuffel(child, unwrap(argument), default)]
-    pub left: u16,
-    #[knuffel(child, unwrap(argument), default)]
-    pub right: u16,
-    #[knuffel(child, unwrap(argument), default)]
-    pub top: u16,
-    #[knuffel(child, unwrap(argument), default)]
-    pub bottom: u16,
-}
-
-#[derive(knuffel::Decode, Debug, Default, PartialEq)]
-pub struct Binds(#[knuffel(children)] pub Vec<Bind>);
-
-#[derive(knuffel::Decode, Debug, PartialEq)]
-pub struct Bind {
-    #[knuffel(node_name)]
-    pub key: Key,
-    #[knuffel(children)]
-    pub actions: Vec<Action>,
-}
-
-#[derive(Debug, PartialEq, Eq)]
-pub struct Key {
-    pub keysym: Keysym,
-    pub modifiers: Modifiers,
-}
-
-bitflags! {
-    #[derive(Debug, Clone, Copy, PartialEq, Eq)]
-    pub struct Modifiers : u8 {
-        const CTRL = 1;
-        const SHIFT = 2;
-        const ALT = 4;
-        const SUPER = 8;
-        const COMPOSITOR = 16;
-    }
-}
-
-#[derive(knuffel::Decode, Debug, Clone, PartialEq)]
-pub enum Action {
-    Quit,
-    #[knuffel(skip)]
-    ChangeVt(i32),
-    Suspend,
-    PowerOffMonitors,
-    ToggleDebugTint,
-    Spawn(#[knuffel(arguments)] Vec<String>),
-    #[knuffel(skip)]
-    ConfirmScreenshot,
-    #[knuffel(skip)]
-    CancelScreenshot,
-    Screenshot,
-    ScreenshotScreen,
-    ScreenshotWindow,
-    CloseWindow,
-    FullscreenWindow,
-    FocusColumnLeft,
-    FocusColumnRight,
-    FocusWindowDown,
-    FocusWindowUp,
-    FocusWindowOrWorkspaceDown,
-    FocusWindowOrWorkspaceUp,
-    MoveColumnLeft,
-    MoveColumnRight,
-    MoveWindowDown,
-    MoveWindowUp,
-    MoveWindowDownOrToWorkspaceDown,
-    MoveWindowUpOrToWorkspaceUp,
-    ConsumeWindowIntoColumn,
-    ExpelWindowFromColumn,
-    CenterColumn,
-    FocusWorkspaceDown,
-    FocusWorkspaceUp,
-    FocusWorkspace(#[knuffel(argument)] u8),
-    MoveWindowToWorkspaceDown,
-    MoveWindowToWorkspaceUp,
-    MoveWindowToWorkspace(#[knuffel(argument)] u8),
-    MoveWorkspaceDown,
-    MoveWorkspaceUp,
-    FocusMonitorLeft,
-    FocusMonitorRight,
-    FocusMonitorDown,
-    FocusMonitorUp,
-    MoveWindowToMonitorLeft,
-    MoveWindowToMonitorRight,
-    MoveWindowToMonitorDown,
-    MoveWindowToMonitorUp,
-    SetWindowHeight(#[knuffel(argument, str)] SizeChange),
-    SwitchPresetColumnWidth,
-    MaximizeColumn,
-    SetColumnWidth(#[knuffel(argument, str)] SizeChange),
-    SwitchLayout(#[knuffel(argument)] LayoutAction),
-}
-
-#[derive(Debug, Clone, Copy, PartialEq)]
-pub enum SizeChange {
-    SetFixed(i32),
-    SetProportion(f64),
-    AdjustFixed(i32),
-    AdjustProportion(f64),
-}
-
-#[derive(knuffel::DecodeScalar, Debug, Clone, Copy, PartialEq)]
-pub enum LayoutAction {
-    Next,
-    Prev,
-}
-
-#[derive(knuffel::Decode, Debug, PartialEq)]
-pub struct DebugConfig {
-    #[knuffel(child, unwrap(argument), default = 1.)]
-    pub animation_slowdown: f64,
-    #[knuffel(child)]
-    pub dbus_interfaces_in_non_session_instances: bool,
-    #[knuffel(child)]
-    pub wait_for_frame_completion_before_queueing: bool,
-    #[knuffel(child)]
-    pub enable_color_transformations_capability: bool,
-    #[knuffel(child)]
-    pub enable_overlay_planes: bool,
-}
-
-impl Default for DebugConfig {
-    fn default() -> Self {
-        Self {
-            animation_slowdown: 1.,
-            dbus_interfaces_in_non_session_instances: false,
-            wait_for_frame_completion_before_queueing: false,
-            enable_color_transformations_capability: false,
-            enable_overlay_planes: false,
-        }
-    }
-}
-
-impl Config {
-    pub fn load(path: Option<PathBuf>) -> miette::Result<(Self, PathBuf)> {
-        let path = if let Some(path) = path {
-            path
-        } else {
-            let mut path = ProjectDirs::from("", "", "niri")
-                .ok_or_else(|| miette!("error retrieving home directory"))?
-                .config_dir()
-                .to_owned();
-            path.push("config.kdl");
-            path
-        };
-
-        let contents = std::fs::read_to_string(&path)
-            .into_diagnostic()
-            .with_context(|| format!("error reading {path:?}"))?;
-
-        let config = Self::parse("config.kdl", &contents).context("error parsing")?;
-        debug!("loaded config from {path:?}");
-        Ok((config, path))
-    }
-
-    pub fn parse(filename: &str, text: &str) -> Result<Self, knuffel::Error> {
-        knuffel::parse(filename, text)
-    }
-}
-
-impl Default for Config {
-    fn default() -> Self {
-        Config::parse(
-            "default-config.kdl",
-            include_str!("../resources/default-config.kdl"),
-        )
-        .unwrap()
-    }
-}
-
-impl FromStr for Mode {
-    type Err = miette::Error;
-
-    fn from_str(s: &str) -> Result<Self, Self::Err> {
-        let Some((width, rest)) = s.split_once('x') else {
-            return Err(miette!("no 'x' separator found"));
-        };
-
-        let (height, refresh) = match rest.split_once('@') {
-            Some((height, refresh)) => (height, Some(refresh)),
-            None => (rest, None),
-        };
-
-        let width = width
-            .parse()
-            .into_diagnostic()
-            .context("error parsing width")?;
-        let height = height
-            .parse()
-            .into_diagnostic()
-            .context("error parsing height")?;
-        let refresh = refresh
-            .map(str::parse)
-            .transpose()
-            .into_diagnostic()
-            .context("error parsing refresh rate")?;
-
-        Ok(Self {
-            width,
-            height,
-            refresh,
-        })
-    }
-}
-
-impl FromStr for Key {
-    type Err = miette::Error;
-
-    fn from_str(s: &str) -> Result<Self, Self::Err> {
-        let mut modifiers = Modifiers::empty();
-
-        let mut split = s.split('+');
-        let key = split.next_back().unwrap();
-
-        for part in split {
-            let part = part.trim();
-            if part.eq_ignore_ascii_case("mod") {
-                modifiers |= Modifiers::COMPOSITOR
-            } else if part.eq_ignore_ascii_case("ctrl") || part.eq_ignore_ascii_case("control") {
-                modifiers |= Modifiers::CTRL;
-            } else if part.eq_ignore_ascii_case("shift") {
-                modifiers |= Modifiers::SHIFT;
-            } else if part.eq_ignore_ascii_case("alt") {
-                modifiers |= Modifiers::ALT;
-            } else if part.eq_ignore_ascii_case("super") || part.eq_ignore_ascii_case("win") {
-                modifiers |= Modifiers::SUPER;
-            } else {
-                return Err(miette!("invalid modifier: {part}"));
-            }
-        }
-
-        let keysym = keysym_from_name(key, KEYSYM_CASE_INSENSITIVE);
-        if keysym.raw() == KEY_NoSymbol {
-            return Err(miette!("invalid key: {key}"));
-        }
-
-        Ok(Key { keysym, modifiers })
-    }
-}
-
-impl FromStr for SizeChange {
-    type Err = miette::Error;
-
-    fn from_str(s: &str) -> Result<Self, Self::Err> {
-        match s.split_once('%') {
-            Some((value, empty)) => {
-                if !empty.is_empty() {
-                    return Err(miette!("trailing characters after '%' are not allowed"));
-                }
-
-                match value.bytes().next() {
-                    Some(b'-' | b'+') => {
-                        let value = value
-                            .parse()
-                            .into_diagnostic()
-                            .context("error parsing value")?;
-                        Ok(Self::AdjustProportion(value))
-                    }
-                    Some(_) => {
-                        let value = value
-                            .parse()
-                            .into_diagnostic()
-                            .context("error parsing value")?;
-                        Ok(Self::SetProportion(value))
-                    }
-                    None => Err(miette!("value is missing")),
-                }
-            }
-            None => {
-                let value = s;
-                match value.bytes().next() {
-                    Some(b'-' | b'+') => {
-                        let value = value
-                            .parse()
-                            .into_diagnostic()
-                            .context("error parsing value")?;
-                        Ok(Self::AdjustFixed(value))
-                    }
-                    Some(_) => {
-                        let value = value
-                            .parse()
-                            .into_diagnostic()
-                            .context("error parsing value")?;
-                        Ok(Self::SetFixed(value))
-                    }
-                    None => Err(miette!("value is missing")),
-                }
-            }
-        }
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use miette::NarratableReportHandler;
-
-    use super::*;
-
-    #[track_caller]
-    fn check(text: &str, expected: Config) {
-        let _ = miette::set_hook(Box::new(|_| Box::new(NarratableReportHandler::new())));
-
-        let parsed = Config::parse("test.kdl", text)
-            .map_err(miette::Report::new)
-            .unwrap();
-        assert_eq!(parsed, expected);
-    }
-
-    #[test]
-    fn parse() {
-        check(
-            r#"
-            input {
-                keyboard {
-                    repeat-delay 600
-                    repeat-rate 25
-                    track-layout "window"
-                    xkb {
-                        layout "us,ru"
-                        options "grp:win_space_toggle"
-                    }
-                }
-
-                touchpad {
-                    tap
-                    accel-speed 0.2
-                }
-
-                tablet {
-                    map-to-output "eDP-1"
-                }
-            }
-
-            output "eDP-1" {
-                scale 2.0
-                position x=10 y=20
-                mode "1920x1080@144"
-            }
-
-            spawn-at-startup "alacritty" "-e" "fish"
-
-            focus-ring {
-                width 5
-                active-color 0 100 200 255
-                inactive-color 255 200 100 0
-            }
-
-            prefer-no-csd
-
-            cursor {
-                xcursor-theme "breeze_cursors"
-                xcursor-size 16
-            }
-
-            preset-column-widths {
-                proportion 0.25
-                proportion 0.5
-                fixed 960
-                fixed 1280
-            }
-
-            default-column-width { proportion 0.25; }
-
-            gaps 8
-
-            struts {
-                left 1
-                right 2
-                top 3
-            }
-
-            screenshot-path "~/Screenshots/screenshot.png"
-
-            binds {
-                Mod+T { spawn "alacritty"; }
-                Mod+Q { close-window; }
-                Mod+Shift+H { focus-monitor-left; }
-                Mod+Ctrl+Shift+L { move-window-to-monitor-right; }
-                Mod+Comma { consume-window-into-column; }
-                Mod+1 { focus-workspace 1;}
-            }
-
-            debug {
-                animation-slowdown 2.0
-            }
-            "#,
-            Config {
-                input: Input {
-                    keyboard: Keyboard {
-                        xkb: Xkb {
-                            layout: Some("us,ru".to_owned()),
-                            options: Some("grp:win_space_toggle".to_owned()),
-                            ..Default::default()
-                        },
-                        repeat_delay: 600,
-                        repeat_rate: 25,
-                        track_layout: TrackLayout::Window,
-                    },
-                    touchpad: Touchpad {
-                        tap: true,
-                        natural_scroll: false,
-                        accel_speed: 0.2,
-                    },
-                    tablet: Tablet {
-                        map_to_output: Some("eDP-1".to_owned()),
-                    },
-                },
-                outputs: vec![Output {
-                    off: false,
-                    name: "eDP-1".to_owned(),
-                    scale: 2.,
-                    position: Some(Position { x: 10, y: 20 }),
-                    mode: Some(Mode {
-                        width: 1920,
-                        height: 1080,
-                        refresh: Some(144.),
-                    }),
-                }],
-                spawn_at_startup: vec![SpawnAtStartup {
-                    command: vec!["alacritty".to_owned(), "-e".to_owned(), "fish".to_owned()],
-                }],
-                focus_ring: FocusRing {
-                    off: false,
-                    width: 5,
-                    active_color: Color {
-                        r: 0,
-                        g: 100,
-                        b: 200,
-                        a: 255,
-                    },
-                    inactive_color: Color {
-                        r: 255,
-                        g: 200,
-                        b: 100,
-                        a: 0,
-                    },
-                },
-                prefer_no_csd: true,
-                cursor: Cursor {
-                    xcursor_theme: String::from("breeze_cursors"),
-                    xcursor_size: 16,
-                },
-                preset_column_widths: vec![
-                    PresetWidth::Proportion(0.25),
-                    PresetWidth::Proportion(0.5),
-                    PresetWidth::Fixed(960),
-                    PresetWidth::Fixed(1280),
-                ],
-                default_column_width: Some(DefaultColumnWidth(vec![PresetWidth::Proportion(0.25)])),
-                gaps: 8,
-                struts: Struts {
-                    left: 1,
-                    right: 2,
-                    top: 3,
-                    bottom: 0,
-                },
-                screenshot_path: Some(String::from("~/Screenshots/screenshot.png")),
-                binds: Binds(vec![
-                    Bind {
-                        key: Key {
-                            keysym: Keysym::t,
-                            modifiers: Modifiers::COMPOSITOR,
-                        },
-                        actions: vec![Action::Spawn(vec!["alacritty".to_owned()])],
-                    },
-                    Bind {
-                        key: Key {
-                            keysym: Keysym::q,
-                            modifiers: Modifiers::COMPOSITOR,
-                        },
-                        actions: vec![Action::CloseWindow],
-                    },
-                    Bind {
-                        key: Key {
-                            keysym: Keysym::h,
-                            modifiers: Modifiers::COMPOSITOR | Modifiers::SHIFT,
-                        },
-                        actions: vec![Action::FocusMonitorLeft],
-                    },
-                    Bind {
-                        key: Key {
-                            keysym: Keysym::l,
-                            modifiers: Modifiers::COMPOSITOR | Modifiers::SHIFT | Modifiers::CTRL,
-                        },
-                        actions: vec![Action::MoveWindowToMonitorRight],
-                    },
-                    Bind {
-                        key: Key {
-                            keysym: Keysym::comma,
-                            modifiers: Modifiers::COMPOSITOR,
-                        },
-                        actions: vec![Action::ConsumeWindowIntoColumn],
-                    },
-                    Bind {
-                        key: Key {
-                            keysym: Keysym::_1,
-                            modifiers: Modifiers::COMPOSITOR,
-                        },
-                        actions: vec![Action::FocusWorkspace(1)],
-                    },
-                ]),
-                debug: DebugConfig {
-                    animation_slowdown: 2.,
-                    ..Default::default()
-                },
-            },
-        );
-    }
-
-    #[test]
-    fn can_create_default_config() {
-        let _ = Config::default();
-    }
-
-    #[test]
-    fn parse_mode() {
-        assert_eq!(
-            "2560x1600@165.004".parse::<Mode>().unwrap(),
-            Mode {
-                width: 2560,
-                height: 1600,
-                refresh: Some(165.004),
-            },
-        );
-
-        assert_eq!(
-            "1920x1080".parse::<Mode>().unwrap(),
-            Mode {
-                width: 1920,
-                height: 1080,
-                refresh: None,
-            },
-        );
-
-        assert!("1920".parse::<Mode>().is_err());
-        assert!("1920x".parse::<Mode>().is_err());
-        assert!("1920x1080@".parse::<Mode>().is_err());
-        assert!("1920x1080@60Hz".parse::<Mode>().is_err());
-    }
-
-    #[test]
-    fn parse_size_change() {
-        assert_eq!(
-            "10".parse::<SizeChange>().unwrap(),
-            SizeChange::SetFixed(10),
-        );
-        assert_eq!(
-            "+10".parse::<SizeChange>().unwrap(),
-            SizeChange::AdjustFixed(10),
-        );
-        assert_eq!(
-            "-10".parse::<SizeChange>().unwrap(),
-            SizeChange::AdjustFixed(-10),
-        );
-        assert_eq!(
-            "10%".parse::<SizeChange>().unwrap(),
-            SizeChange::SetProportion(10.),
-        );
-        assert_eq!(
-            "+10%".parse::<SizeChange>().unwrap(),
-            SizeChange::AdjustProportion(10.),
-        );
-        assert_eq!(
-            "-10%".parse::<SizeChange>().unwrap(),
-            SizeChange::AdjustProportion(-10.),
-        );
-
-        assert!("-".parse::<SizeChange>().is_err());
-        assert!("10% ".parse::<SizeChange>().is_err());
-    }
-}

src/cursor.rs

@@ -8,8 +8,7 @@ use std::sync::Mutex;
 
 use anyhow::{anyhow, Context};
 use smithay::backend::allocator::Fourcc;
-use smithay::backend::renderer::element::texture::TextureBuffer;
-use smithay::backend::renderer::gles::{GlesRenderer, GlesTexture};
+use smithay::backend::renderer::element::memory::MemoryRenderBuffer;
 use smithay::input::pointer::{CursorIcon, CursorImageAttributes, CursorImageStatus};
 use smithay::reexports::wayland_server::protocol::wl_surface::WlSurface;
 use smithay::utils::{IsAlive, Logical, Physical, Point, Transform};
@@ -143,7 +142,7 @@ impl CursorManager {
             .unwrap()
     }
 
-    /// Currenly used cursor_image as a cursor provider.
+    /// Currently used cursor_image as a cursor provider.
     pub fn cursor_image(&self) -> &CursorImageStatus {
         &self.current_cursor
     }
@@ -224,7 +223,7 @@ pub enum RenderCursor {
     },
 }
 
-type TextureCache = HashMap<(CursorIcon, i32), Vec<TextureBuffer<GlesTexture>>>;
+type TextureCache = HashMap<(CursorIcon, i32), Vec<MemoryRenderBuffer>>;
 
 #[derive(Default)]
 pub struct CursorTextureCache {
@@ -238,12 +237,11 @@ impl CursorTextureCache {
 
     pub fn get(
         &self,
-        renderer: &mut GlesRenderer,
         icon: CursorIcon,
         scale: i32,
         cursor: &XCursor,
         idx: usize,
-    ) -> TextureBuffer<GlesTexture> {
+    ) -> MemoryRenderBuffer {
         self.cache
             .borrow_mut()
             .entry((icon, scale))
@@ -252,19 +250,14 @@ impl CursorTextureCache {
                     .frames()
                     .iter()
                     .map(|frame| {
-                        let _span = tracy_client::span!("create TextureBuffer");
-
-                        TextureBuffer::from_memory(
-                            renderer,
+                        MemoryRenderBuffer::from_slice(
                             &frame.pixels_rgba,
-                            Fourcc::Abgr8888,
+                            Fourcc::Argb8888,
                             (frame.width as i32, frame.height as i32),
-                            false,
                             scale,
                             Transform::Normal,
                             None,
                         )
-                        .unwrap()
                     })
                     .collect()
             })[idx]

src/dbus/freedesktop_screensaver.rs

@@ -0,0 +1,167 @@
+use std::collections::hash_map::Entry;
+use std::collections::HashMap;
+use std::sync::atomic::{AtomicBool, Ordering};
+use std::sync::{Arc, Mutex, OnceLock};
+
+use anyhow::Context;
+use futures_util::StreamExt;
+use zbus::fdo::{self, RequestNameFlags};
+use zbus::message::Header;
+use zbus::names::{OwnedUniqueName, UniqueName};
+use zbus::zvariant::NoneValue;
+use zbus::{interface, Task};
+
+use super::Start;
+
+pub struct ScreenSaver {
+    is_inhibited: Arc<AtomicBool>,
+    is_broken: Arc<AtomicBool>,
+    inhibitors: Arc<Mutex<HashMap<u32, OwnedUniqueName>>>,
+    counter: u32,
+    monitor_task: Arc<OnceLock<Task<()>>>,
+}
+
+#[interface(name = "org.freedesktop.ScreenSaver")]
+impl ScreenSaver {
+    async fn inhibit(
+        &mut self,
+        #[zbus(header)] hdr: Header<'_>,
+        application_name: &str,
+        reason_for_inhibit: &str,
+    ) -> fdo::Result<u32> {
+        trace!(
+            "fdo inhibit, app: `{application_name}`, reason: `{reason_for_inhibit}`, owner: {:?}",
+            hdr.sender()
+        );
+
+        let Some(name) = hdr.sender() else {
+            return Err(fdo::Error::Failed(String::from("no sender")));
+        };
+        let name = OwnedUniqueName::from(name.to_owned());
+
+        let mut inhibitors = self.inhibitors.lock().unwrap();
+
+        let mut cookie = None;
+        for _ in 0..3 {
+            // Start from 1 because some clients don't like 0.
+            self.counter = self.counter.wrapping_add(1);
+            if self.counter == 0 {
+                self.counter += 1;
+            }
+
+            if let Entry::Vacant(entry) = inhibitors.entry(self.counter) {
+                entry.insert(name);
+                self.is_inhibited.store(true, Ordering::SeqCst);
+                cookie = Some(self.counter);
+                break;
+            }
+        }
+
+        cookie.ok_or_else(|| fdo::Error::Failed(String::from("no available cookie")))
+    }
+
+    async fn un_inhibit(&mut self, cookie: u32) -> fdo::Result<()> {
+        trace!("fdo uninhibit, cookie: {cookie}");
+
+        let mut inhibitors = self.inhibitors.lock().unwrap();
+
+        if inhibitors.remove(&cookie).is_some() {
+            if inhibitors.is_empty() {
+                self.is_inhibited.store(false, Ordering::SeqCst);
+            }
+
+            Ok(())
+        } else {
+            Err(fdo::Error::Failed(String::from("invalid cookie")))
+        }
+    }
+}
+
+impl ScreenSaver {
+    pub fn new(is_inhibited: Arc<AtomicBool>) -> Self {
+        Self {
+            is_inhibited,
+            is_broken: Arc::new(AtomicBool::new(false)),
+            inhibitors: Arc::new(Mutex::new(HashMap::new())),
+            counter: 0,
+            monitor_task: Arc::new(OnceLock::new()),
+        }
+    }
+}
+
+async fn monitor_disappeared_clients(
+    conn: &zbus::Connection,
+    is_inhibited: Arc<AtomicBool>,
+    inhibitors: Arc<Mutex<HashMap<u32, OwnedUniqueName>>>,
+) -> anyhow::Result<()> {
+    let proxy = fdo::DBusProxy::new(conn)
+        .await
+        .context("error creating a DBusProxy")?;
+
+    let mut stream = proxy
+        .receive_name_owner_changed_with_args(&[(2, UniqueName::null_value())])
+        .await
+        .context("error creating a NameOwnerChanged stream")?;
+
+    while let Some(signal) = stream.next().await {
+        let args = signal
+            .args()
+            .context("error retrieving NameOwnerChanged args")?;
+
+        let Some(name) = &**args.old_owner() else {
+            continue;
+        };
+
+        if args.new_owner().is_none() {
+            trace!("fdo ScreenSaver client disappeared: {name}");
+
+            let mut inhibitors = inhibitors.lock().unwrap();
+            inhibitors.retain(|_, owner| owner != name);
+            is_inhibited.store(!inhibitors.is_empty(), Ordering::SeqCst);
+        } else {
+            error!("non-null new_owner should've been filtered out");
+        }
+    }
+
+    Ok(())
+}
+
+impl Start for ScreenSaver {
+    fn start(self) -> anyhow::Result<zbus::blocking::Connection> {
+        let is_inhibited = self.is_inhibited.clone();
+        let is_broken = self.is_broken.clone();
+        let inhibitors = self.inhibitors.clone();
+        let monitor_task = self.monitor_task.clone();
+
+        let conn = zbus::blocking::Connection::session()?;
+        let flags = RequestNameFlags::AllowReplacement
+            | RequestNameFlags::ReplaceExisting
+            | RequestNameFlags::DoNotQueue;
+
+        conn.object_server()
+            .at("/org/freedesktop/ScreenSaver", self)?;
+        conn.request_name_with_flags("org.freedesktop.ScreenSaver", flags)?;
+
+        let async_conn = conn.inner();
+        let future = {
+            let conn = async_conn.clone();
+            async move {
+                if let Err(err) =
+                    monitor_disappeared_clients(&conn, is_inhibited.clone(), inhibitors.clone())
+                        .await
+                {
+                    warn!("error monitoring org.freedesktop.ScreenSaver clients: {err:?}");
+                    is_broken.store(true, Ordering::SeqCst);
+                    is_inhibited.store(false, Ordering::SeqCst);
+                    inhibitors.lock().unwrap().clear();
+                }
+            }
+        };
+        let task = async_conn
+            .executor()
+            .spawn(future, "monitor disappearing clients");
+        monitor_task.set(task).unwrap();
+
+        Ok(conn)
+    }
+}

src/dbus/gnome_shell_introspect.rs

@@ -0,0 +1,82 @@
+use std::collections::HashMap;
+
+use zbus::fdo::{self, RequestNameFlags};
+use zbus::interface;
+use zbus::object_server::SignalEmitter;
+use zbus::zvariant::{SerializeDict, Type, Value};
+
+use super::Start;
+
+pub struct Introspect {
+    to_niri: calloop::channel::Sender<IntrospectToNiri>,
+    from_niri: async_channel::Receiver<NiriToIntrospect>,
+}
+
+pub enum IntrospectToNiri {
+    GetWindows,
+}
+
+pub enum NiriToIntrospect {
+    Windows(HashMap<u64, WindowProperties>),
+}
+
+#[derive(Debug, SerializeDict, Type, Value)]
+#[zvariant(signature = "dict")]
+pub struct WindowProperties {
+    /// Window title.
+    pub title: String,
+    /// Window app ID.
+    ///
+    /// This is actually the name of the .desktop file, and Shell does internal tracking to match
+    /// Wayland app IDs to desktop files. We don't do that yet, which is the reason why
+    /// xdg-desktop-portal-gnome's window list is missing icons.
+    #[zvariant(rename = "app-id")]
+    pub app_id: String,
+}
+
+#[interface(name = "org.gnome.Shell.Introspect")]
+impl Introspect {
+    async fn get_windows(&self) -> fdo::Result<HashMap<u64, WindowProperties>> {
+        if let Err(err) = self.to_niri.send(IntrospectToNiri::GetWindows) {
+            warn!("error sending message to niri: {err:?}");
+            return Err(fdo::Error::Failed("internal error".to_owned()));
+        }
+
+        match self.from_niri.recv().await {
+            Ok(NiriToIntrospect::Windows(windows)) => Ok(windows),
+            Err(err) => {
+                warn!("error receiving message from niri: {err:?}");
+                Err(fdo::Error::Failed("internal error".to_owned()))
+            }
+        }
+    }
+
+    // FIXME: call this upon window changes, once more of the infrastructure is there (will be
+    // needed for the event stream IPC anyway).
+    #[zbus(signal)]
+    pub async fn windows_changed(ctxt: &SignalEmitter<'_>) -> zbus::Result<()>;
+}
+
+impl Introspect {
+    pub fn new(
+        to_niri: calloop::channel::Sender<IntrospectToNiri>,
+        from_niri: async_channel::Receiver<NiriToIntrospect>,
+    ) -> Self {
+        Self { to_niri, from_niri }
+    }
+}
+
+impl Start for Introspect {
+    fn start(self) -> anyhow::Result<zbus::blocking::Connection> {
+        let conn = zbus::blocking::Connection::session()?;
+        let flags = RequestNameFlags::AllowReplacement
+            | RequestNameFlags::ReplaceExisting
+            | RequestNameFlags::DoNotQueue;
+
+        conn.object_server()
+            .at("/org/gnome/Shell/Introspect", self)?;
+        conn.request_name_with_flags("org.gnome.Shell.Introspect", flags)?;
+
+        Ok(conn)
+    }
+}

src/dbus/gnome_shell_screenshot.rs

@@ -1,8 +1,7 @@
 use std::path::PathBuf;
 
-use smithay::reexports::calloop;
-use zbus::dbus_interface;
 use zbus::fdo::{self, RequestNameFlags};
+use zbus::interface;
 
 use super::Start;
 
@@ -19,7 +18,7 @@ pub enum NiriToScreenshot {
     ScreenshotResult(Option<PathBuf>),
 }
 
-#[dbus_interface(name = "org.gnome.Shell.Screenshot")]
+#[interface(name = "org.gnome.Shell.Screenshot")]
 impl Screenshot {
     async fn screenshot(
         &self,

src/dbus/mod.rs

@@ -1,9 +1,10 @@
-use smithay::reexports::calloop;
 use zbus::blocking::Connection;
-use zbus::Interface;
+use zbus::object_server::Interface;
 
 use crate::niri::State;
 
+pub mod freedesktop_screensaver;
+pub mod gnome_shell_introspect;
 pub mod gnome_shell_screenshot;
 pub mod mutter_display_config;
 pub mod mutter_service_channel;
@@ -13,6 +14,8 @@ pub mod mutter_screen_cast;
 #[cfg(feature = "xdp-gnome-screencast")]
 use mutter_screen_cast::ScreenCast;
 
+use self::freedesktop_screensaver::ScreenSaver;
+use self::gnome_shell_introspect::Introspect;
 use self::mutter_display_config::DisplayConfig;
 use self::mutter_service_channel::ServiceChannel;
 
@@ -24,7 +27,9 @@ trait Start: Interface {
 pub struct DBusServers {
     pub conn_service_channel: Option<Connection>,
     pub conn_display_config: Option<Connection>,
+    pub conn_screen_saver: Option<Connection>,
     pub conn_screen_shot: Option<Connection>,
+    pub conn_introspect: Option<Connection>,
     #[cfg(feature = "xdp-gnome-screencast")]
     pub conn_screen_cast: Option<Connection>,
 }
@@ -45,9 +50,12 @@ impl DBusServers {
         }
 
         if is_session_instance || config.debug.dbus_interfaces_in_non_session_instances {
-            let display_config = DisplayConfig::new(backend.connectors());
+            let display_config = DisplayConfig::new(backend.ipc_outputs());
             dbus.conn_display_config = try_start(display_config);
 
+            let screen_saver = ScreenSaver::new(niri.is_fdo_idle_inhibited.clone());
+            dbus.conn_screen_saver = try_start(screen_saver);
+
             let (to_niri, from_screenshot) = calloop::channel::channel();
             let (to_screenshot, from_niri) = async_channel::unbounded();
             niri.event_loop
@@ -61,21 +69,31 @@ impl DBusServers {
             let screenshot = gnome_shell_screenshot::Screenshot::new(to_niri, from_niri);
             dbus.conn_screen_shot = try_start(screenshot);
 
+            let (to_niri, from_introspect) = calloop::channel::channel();
+            let (to_introspect, from_niri) = async_channel::unbounded();
+            niri.event_loop
+                .insert_source(from_introspect, move |event, _, state| match event {
+                    calloop::channel::Event::Msg(msg) => {
+                        state.on_introspect_msg(&to_introspect, msg)
+                    }
+                    calloop::channel::Event::Closed => (),
+                })
+                .unwrap();
+            let introspect = Introspect::new(to_niri, from_niri);
+            dbus.conn_introspect = try_start(introspect);
+
             #[cfg(feature = "xdp-gnome-screencast")]
             {
                 let (to_niri, from_screen_cast) = calloop::channel::channel();
                 niri.event_loop
                     .insert_source(from_screen_cast, {
-                        let to_niri = to_niri.clone();
                         move |event, _, state| match event {
-                            calloop::channel::Event::Msg(msg) => {
-                                state.on_screen_cast_msg(&to_niri, msg)
-                            }
+                            calloop::channel::Event::Msg(msg) => state.on_screen_cast_msg(msg),
                             calloop::channel::Event::Closed => (),
                         }
                     })
                     .unwrap();
-                let screen_cast = ScreenCast::new(backend.connectors(), to_niri);
+                let screen_cast = ScreenCast::new(backend.ipc_outputs(), to_niri);
                 dbus.conn_screen_cast = try_start(screen_cast);
             }
         }

src/dbus/mutter_display_config.rs

@@ -2,15 +2,17 @@ use std::collections::HashMap;
 use std::sync::{Arc, Mutex};
 
 use serde::Serialize;
-use smithay::output::Output;
 use zbus::fdo::RequestNameFlags;
-use zbus::zvariant::{OwnedValue, Type};
-use zbus::{dbus_interface, fdo};
+use zbus::object_server::SignalEmitter;
+use zbus::zvariant::{self, OwnedValue, Type};
+use zbus::{fdo, interface};
 
 use super::Start;
+use crate::backend::IpcOutputMap;
+use crate::utils::is_laptop_panel;
 
 pub struct DisplayConfig {
-    connectors: Arc<Mutex<HashMap<String, Output>>>,
+    ipc_outputs: Arc<Mutex<IpcOutputMap>>,
 }
 
 #[derive(Serialize, Type)]
@@ -42,7 +44,7 @@ pub struct LogicalMonitor {
     properties: HashMap<String, OwnedValue>,
 }
 
-#[dbus_interface(name = "org.gnome.Mutter.DisplayConfig")]
+#[interface(name = "org.gnome.Mutter.DisplayConfig")]
 impl DisplayConfig {
     async fn get_current_state(
         &self,
@@ -53,40 +55,115 @@ impl DisplayConfig {
         HashMap<String, OwnedValue>,
     )> {
         // Construct the DBus response.
-        let monitors: Vec<Monitor> = self
-            .connectors
+        let mut monitors: Vec<(Monitor, LogicalMonitor)> = self
+            .ipc_outputs
             .lock()
             .unwrap()
-            .keys()
-            .map(|c| Monitor {
-                names: (c.clone(), String::new(), String::new(), String::new()),
-                modes: vec![],
-                properties: HashMap::new(),
+            .values()
+            // Take only enabled outputs.
+            .filter(|output| output.current_mode.is_some() && output.logical.is_some())
+            .map(|output| {
+                // Loosely matches the check in Mutter.
+                let c = &output.name;
+                let is_laptop_panel = is_laptop_panel(c);
+                let display_name = make_display_name(output, is_laptop_panel);
+
+                let mut properties = HashMap::new();
+                properties.insert(
+                    String::from("display-name"),
+                    OwnedValue::from(zvariant::Str::from(display_name)),
+                );
+                properties.insert(
+                    String::from("is-builtin"),
+                    OwnedValue::from(is_laptop_panel),
+                );
+
+                let mut modes: Vec<Mode> = output
+                    .modes
+                    .iter()
+                    .map(|m| {
+                        let niri_ipc::Mode {
+                            width,
+                            height,
+                            refresh_rate,
+                            is_preferred,
+                        } = *m;
+                        let refresh = refresh_rate as f64 / 1000.;
+
+                        Mode {
+                            id: format!("{width}x{height}@{refresh:.3}"),
+                            width: i32::from(width),
+                            height: i32::from(height),
+                            refresh_rate: refresh,
+                            preferred_scale: 1.,
+                            supported_scales: vec![1., 2., 3.],
+                            properties: HashMap::from([(
+                                String::from("is-preferred"),
+                                OwnedValue::from(is_preferred),
+                            )]),
+                        }
+                    })
+                    .collect();
+                modes[output.current_mode.unwrap()]
+                    .properties
+                    .insert(String::from("is-current"), OwnedValue::from(true));
+
+                let connector = c.clone();
+                let model = output.model.clone();
+                let make = output.make.clone();
+
+                // Serial is used for session restore, so fall back to the connector name if it's
+                // not available.
+                let serial = output.serial.as_ref().unwrap_or(&connector).clone();
+
+                let monitor = Monitor {
+                    names: (connector, make, model, serial),
+                    modes,
+                    properties,
+                };
+
+                let logical = output.logical.as_ref().unwrap();
+
+                let transform = match logical.transform {
+                    niri_ipc::Transform::Normal => 0,
+                    niri_ipc::Transform::_90 => 1,
+                    niri_ipc::Transform::_180 => 2,
+                    niri_ipc::Transform::_270 => 3,
+                    niri_ipc::Transform::Flipped => 4,
+                    niri_ipc::Transform::Flipped90 => 5,
+                    niri_ipc::Transform::Flipped180 => 6,
+                    niri_ipc::Transform::Flipped270 => 7,
+                };
+
+                let logical_monitor = LogicalMonitor {
+                    x: logical.x,
+                    y: logical.y,
+                    scale: logical.scale,
+                    transform,
+                    is_primary: false,
+                    monitors: vec![monitor.names.clone()],
+                    properties: HashMap::new(),
+                };
+
+                (monitor, logical_monitor)
             })
             .collect();
 
-        let logical_monitors = monitors
-            .iter()
-            .map(|m| LogicalMonitor {
-                x: 0,
-                y: 0,
-                scale: 1.,
-                transform: 0,
-                is_primary: false,
-                monitors: vec![m.names.clone()],
-                properties: HashMap::new(),
-            })
-            .collect();
+        // Sort by connector.
+        monitors.sort_unstable_by(|a, b| a.0.names.0.cmp(&b.0.names.0));
 
-        Ok((0, monitors, logical_monitors, HashMap::new()))
+        let (monitors, logical_monitors) = monitors.into_iter().unzip();
+        let properties = HashMap::from([(String::from("layout-mode"), OwnedValue::from(1u32))]);
+        Ok((0, monitors, logical_monitors, properties))
     }
 
-    // FIXME: monitors-changed signal.
+    #[zbus(signal)]
+    pub async fn monitors_changed(ctxt: &SignalEmitter<'_>) -> zbus::Result<()>;
 }
 
 impl DisplayConfig {
-    pub fn new(connectors: Arc<Mutex<HashMap<String, Output>>>) -> Self {
-        Self { connectors }
+    pub fn new(ipc_outputs: Arc<Mutex<IpcOutputMap>>) -> Self {
+        Self { ipc_outputs }
     }
 }
 
@@ -104,3 +181,48 @@ impl Start for DisplayConfig {
         Ok(conn)
     }
 }
+
+// Adapted from Mutter.
+fn make_display_name(output: &niri_ipc::Output, is_laptop_panel: bool) -> String {
+    if is_laptop_panel {
+        return String::from("Built-in display");
+    }
+
+    let make = &output.make;
+    let model = &output.model;
+    if let Some(diagonal) = output.physical_size.map(|(width_mm, height_mm)| {
+        let diagonal = f64::hypot(f64::from(width_mm), f64::from(height_mm)) / 25.4;
+        format_diagonal(diagonal)
+    }) {
+        format!("{make} {diagonal}")
+    } else if model != "Unknown" {
+        format!("{make} {model}")
+    } else {
+        make.clone()
+    }
+}
+
+fn format_diagonal(diagonal_inches: f64) -> String {
+    let known = [12.1, 13.3, 15.6];
+    if let Some(d) = known.iter().find(|d| (*d - diagonal_inches).abs() < 0.1) {
+        format!("{d:.1}″")
+    } else {
+        format!("{}″", diagonal_inches.round() as u32)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use insta::assert_snapshot;
+
+    use super::*;
+
+    #[test]
+    fn test_format_diagonal() {
+        assert_snapshot!(format_diagonal(12.11), @"12.1″");
+        assert_snapshot!(format_diagonal(13.28), @"13.3″");
+        assert_snapshot!(format_diagonal(15.6), @"15.6″");
+        assert_snapshot!(format_diagonal(23.2), @"23″");
+        assert_snapshot!(format_diagonal(24.8), @"25″");
+    }
+}

src/dbus/mutter_screen_cast.rs

@@ -4,27 +4,30 @@ use std::sync::atomic::{AtomicBool, AtomicUsize, Ordering};
 use std::sync::{Arc, Mutex};
 
 use serde::Deserialize;
-use smithay::output::Output;
-use smithay::reexports::calloop;
 use zbus::fdo::RequestNameFlags;
-use zbus::zvariant::{DeserializeDict, OwnedObjectPath, Type, Value};
-use zbus::{dbus_interface, fdo, InterfaceRef, ObjectServer, SignalContext};
+use zbus::object_server::{InterfaceRef, SignalEmitter};
+use zbus::zvariant::{DeserializeDict, OwnedObjectPath, SerializeDict, Type, Value};
+use zbus::{fdo, interface, ObjectServer};
 
 use super::Start;
+use crate::backend::IpcOutputMap;
 
 #[derive(Clone)]
 pub struct ScreenCast {
-    connectors: Arc<Mutex<HashMap<String, Output>>>,
+    ipc_outputs: Arc<Mutex<IpcOutputMap>>,
     to_niri: calloop::channel::Sender<ScreenCastToNiri>,
+    #[allow(clippy::type_complexity)]
     sessions: Arc<Mutex<Vec<(Session, InterfaceRef<Session>)>>>,
 }
 
 #[derive(Clone)]
 pub struct Session {
     id: usize,
-    connectors: Arc<Mutex<HashMap<String, Output>>>,
+    ipc_outputs: Arc<Mutex<IpcOutputMap>>,
     to_niri: calloop::channel::Sender<ScreenCastToNiri>,
+    #[allow(clippy::type_complexity)]
     streams: Arc<Mutex<Vec<(Stream, InterfaceRef<Stream>)>>>,
+    stopped: Arc<AtomicBool>,
 }
 
 #[derive(Debug, Default, Deserialize, Type, Clone, Copy)]
@@ -44,27 +47,62 @@ struct RecordMonitorProperties {
     _is_recording: Option<bool>,
 }
 
+#[derive(Debug, DeserializeDict, Type)]
+#[zvariant(signature = "dict")]
+struct RecordWindowProperties {
+    #[zvariant(rename = "window-id")]
+    window_id: u64,
+    #[zvariant(rename = "cursor-mode")]
+    cursor_mode: Option<CursorMode>,
+    #[zvariant(rename = "is-recording")]
+    _is_recording: Option<bool>,
+}
+
+static STREAM_ID: AtomicUsize = AtomicUsize::new(0);
+
 #[derive(Clone)]
 pub struct Stream {
-    output: Output,
+    target: StreamTarget,
     cursor_mode: CursorMode,
     was_started: Arc<AtomicBool>,
     to_niri: calloop::channel::Sender<ScreenCastToNiri>,
 }
 
+#[derive(Clone)]
+enum StreamTarget {
+    // FIXME: update on scale changes and whatnot.
+    Output(niri_ipc::Output),
+    Window { id: u64 },
+}
+
+#[derive(Debug, Clone)]
+pub enum StreamTargetId {
+    Output { name: String },
+    Window { id: u64 },
+}
+
+#[derive(Debug, SerializeDict, Type, Value)]
+#[zvariant(signature = "dict")]
+struct StreamParameters {
+    /// Position of the stream in logical coordinates.
+    position: (i32, i32),
+    /// Size of the stream in logical coordinates.
+    size: (i32, i32),
+}
+
 pub enum ScreenCastToNiri {
     StartCast {
         session_id: usize,
-        output: Output,
+        target: StreamTargetId,
         cursor_mode: CursorMode,
-        signal_ctx: SignalContext<'static>,
+        signal_ctx: SignalEmitter<'static>,
     },
     StopCast {
         session_id: usize,
     },
 }
 
-#[dbus_interface(name = "org.gnome.Mutter.ScreenCast")]
+#[interface(name = "org.gnome.Mutter.ScreenCast")]
 impl ScreenCast {
     async fn create_session(
         &self,
@@ -82,7 +120,7 @@ impl ScreenCast {
         let path = format!("/org/gnome/Mutter/ScreenCast/Session/u{}", session_id);
         let path = OwnedObjectPath::try_from(path).unwrap();
 
-        let session = Session::new(session_id, self.connectors.clone(), self.to_niri.clone());
+        let session = Session::new(session_id, self.ipc_outputs.clone(), self.to_niri.clone());
         match server.at(&path, session.clone()).await {
             Ok(true) => {
                 let iface = server.interface(&path).await.unwrap();
@@ -99,29 +137,34 @@ impl ScreenCast {
         Ok(path)
     }
 
-    #[dbus_interface(property)]
+    #[zbus(property)]
     async fn version(&self) -> i32 {
         4
     }
 }
 
-#[dbus_interface(name = "org.gnome.Mutter.ScreenCast.Session")]
+#[interface(name = "org.gnome.Mutter.ScreenCast.Session")]
 impl Session {
     async fn start(&self) {
         debug!("start");
 
         for (stream, iface) in &*self.streams.lock().unwrap() {
-            stream.start(self.id, iface.signal_context().clone());
+            stream.start(self.id, iface.signal_emitter().clone());
         }
     }
 
     pub async fn stop(
         &self,
         #[zbus(object_server)] server: &ObjectServer,
-        #[zbus(signal_context)] ctxt: SignalContext<'_>,
+        #[zbus(signal_context)] ctxt: SignalEmitter<'_>,
     ) {
         debug!("stop");
 
+        if self.stopped.swap(true, Ordering::SeqCst) {
+            // Already stopped.
+            return;
+        }
+
         Session::closed(&ctxt).await.unwrap();
 
         if let Err(err) = self.to_niri.send(ScreenCastToNiri::StopCast {
@@ -133,7 +176,7 @@ impl Session {
         let streams = mem::take(&mut *self.streams.lock().unwrap());
         for (_, iface) in streams.iter() {
             server
-                .remove::<Stream, _>(iface.signal_context().path())
+                .remove::<Stream, _>(iface.signal_emitter().path())
                 .await
                 .unwrap();
         }
@@ -149,20 +192,28 @@ impl Session {
     ) -> fdo::Result<OwnedObjectPath> {
         debug!(connector, ?properties, "record_monitor");
 
-        let Some(output) = self.connectors.lock().unwrap().get(connector).cloned() else {
+        let output = {
+            let ipc_outputs = self.ipc_outputs.lock().unwrap();
+            ipc_outputs.values().find(|o| o.name == connector).cloned()
+        };
+        let Some(output) = output else {
             return Err(fdo::Error::Failed("no such monitor".to_owned()));
         };
 
-        static NUMBER: AtomicUsize = AtomicUsize::new(0);
+        if output.logical.is_none() {
+            return Err(fdo::Error::Failed("monitor is disabled".to_owned()));
+        }
+
         let path = format!(
             "/org/gnome/Mutter/ScreenCast/Stream/u{}",
-            NUMBER.fetch_add(1, Ordering::SeqCst)
+            STREAM_ID.fetch_add(1, Ordering::SeqCst)
         );
         let path = OwnedObjectPath::try_from(path).unwrap();
 
         let cursor_mode = properties.cursor_mode.unwrap_or_default();
 
-        let stream = Stream::new(output, cursor_mode, self.to_niri.clone());
+        let target = StreamTarget::Output(output);
+        let stream = Stream::new(target, cursor_mode, self.to_niri.clone());
         match server.at(&path, stream.clone()).await {
             Ok(true) => {
                 let iface = server.interface(&path).await.unwrap();
@@ -179,24 +230,79 @@ impl Session {
         Ok(path)
     }
 
-    #[dbus_interface(signal)]
-    async fn closed(ctxt: &SignalContext<'_>) -> zbus::Result<()>;
+    async fn record_window(
+        &mut self,
+        #[zbus(object_server)] server: &ObjectServer,
+        properties: RecordWindowProperties,
+    ) -> fdo::Result<OwnedObjectPath> {
+        debug!(?properties, "record_window");
+
+        let path = format!(
+            "/org/gnome/Mutter/ScreenCast/Stream/u{}",
+            STREAM_ID.fetch_add(1, Ordering::SeqCst)
+        );
+        let path = OwnedObjectPath::try_from(path).unwrap();
+
+        let cursor_mode = properties.cursor_mode.unwrap_or_default();
+
+        let target = StreamTarget::Window {
+            id: properties.window_id,
+        };
+        let stream = Stream::new(target, cursor_mode, self.to_niri.clone());
+        match server.at(&path, stream.clone()).await {
+            Ok(true) => {
+                let iface = server.interface(&path).await.unwrap();
+                self.streams.lock().unwrap().push((stream, iface));
+            }
+            Ok(false) => return Err(fdo::Error::Failed("stream path already exists".to_owned())),
+            Err(err) => {
+                return Err(fdo::Error::Failed(format!(
+                    "error creating stream object: {err:?}"
+                )))
+            }
+        }
+
+        Ok(path)
+    }
+
+    #[zbus(signal)]
+    async fn closed(ctxt: &SignalEmitter<'_>) -> zbus::Result<()>;
 }
 
-#[dbus_interface(name = "org.gnome.Mutter.ScreenCast.Stream")]
+#[interface(name = "org.gnome.Mutter.ScreenCast.Stream")]
 impl Stream {
-    #[dbus_interface(signal)]
-    pub async fn pipe_wire_stream_added(ctxt: &SignalContext<'_>, node_id: u32)
+    #[zbus(signal)]
+    pub async fn pipe_wire_stream_added(ctxt: &SignalEmitter<'_>, node_id: u32)
         -> zbus::Result<()>;
+
+    #[zbus(property)]
+    async fn parameters(&self) -> StreamParameters {
+        match &self.target {
+            StreamTarget::Output(output) => {
+                let logical = output.logical.as_ref().unwrap();
+                StreamParameters {
+                    position: (logical.x, logical.y),
+                    size: (logical.width as i32, logical.height as i32),
+                }
+            }
+            StreamTarget::Window { .. } => {
+                // Does any consumer need this?
+                StreamParameters {
+                    position: (0, 0),
+                    size: (1, 1),
+                }
+            }
+        }
+    }
 }
 
 impl ScreenCast {
     pub fn new(
-        connectors: Arc<Mutex<HashMap<String, Output>>>,
+        ipc_outputs: Arc<Mutex<IpcOutputMap>>,
         to_niri: calloop::channel::Sender<ScreenCastToNiri>,
     ) -> Self {
         Self {
-            connectors,
+            ipc_outputs,
             to_niri,
             sessions: Arc::new(Mutex::new(vec![])),
         }
@@ -221,14 +327,15 @@ impl Start for ScreenCast {
 impl Session {
     pub fn new(
         id: usize,
-        connectors: Arc<Mutex<HashMap<String, Output>>>,
+        ipc_outputs: Arc<Mutex<IpcOutputMap>>,
         to_niri: calloop::channel::Sender<ScreenCastToNiri>,
     ) -> Self {
         Self {
             id,
-            connectors,
+            ipc_outputs,
             streams: Arc::new(Mutex::new(vec![])),
             to_niri,
+            stopped: Arc::new(AtomicBool::new(false)),
         }
     }
 }
@@ -242,27 +349,27 @@ impl Drop for Session {
 }
 
 impl Stream {
-    pub fn new(
-        output: Output,
+    fn new(
+        target: StreamTarget,
         cursor_mode: CursorMode,
         to_niri: calloop::channel::Sender<ScreenCastToNiri>,
     ) -> Self {
         Self {
-            output,
+            target,
             cursor_mode,
             was_started: Arc::new(AtomicBool::new(false)),
             to_niri,
         }
     }
 
-    fn start(&self, session_id: usize, ctxt: SignalContext<'static>) {
+    fn start(&self, session_id: usize, ctxt: SignalEmitter<'static>) {
         if self.was_started.load(Ordering::SeqCst) {
             return;
         }
 
         let msg = ScreenCastToNiri::StartCast {
             session_id,
-            output: self.output.clone(),
+            target: self.target.make_id(),
             cursor_mode: self.cursor_mode,
             signal_ctx: ctxt,
         };
@@ -272,3 +379,14 @@ impl Stream {
         }
     }
 }
+
+impl StreamTarget {
+    fn make_id(&self) -> StreamTargetId {
+        match self {
+            StreamTarget::Output(output) => StreamTargetId::Output {
+                name: output.name.clone(),
+            },
+            StreamTarget::Window { id } => StreamTargetId::Window { id: *id },
+        }
+    }
+}

src/dbus/mutter_service_channel.rs

@@ -1,9 +1,8 @@
-use std::os::fd::{FromRawFd, IntoRawFd};
 use std::os::unix::net::UnixStream;
 use std::sync::Arc;
 
 use smithay::reexports::wayland_server::DisplayHandle;
-use zbus::dbus_interface;
+use zbus::{fdo, interface, zvariant};
 
 use super::Start;
 use crate::niri::ClientState;
@@ -12,23 +11,29 @@ pub struct ServiceChannel {
     display: DisplayHandle,
 }
 
-#[dbus_interface(name = "org.gnome.Mutter.ServiceChannel")]
+#[interface(name = "org.gnome.Mutter.ServiceChannel")]
 impl ServiceChannel {
     async fn open_wayland_service_connection(
         &mut self,
         service_client_type: u32,
-    ) -> zbus::fdo::Result<zbus::zvariant::OwnedFd> {
+    ) -> fdo::Result<zvariant::OwnedFd> {
         if service_client_type != 1 {
-            return Err(zbus::fdo::Error::InvalidArgs(
+            return Err(fdo::Error::InvalidArgs(
                 "Invalid service client type".to_owned(),
             ));
         }
 
         let (sock1, sock2) = UnixStream::pair().unwrap();
-        self.display
-            .insert_client(sock2, Arc::new(ClientState::default()))
-            .unwrap();
-        Ok(unsafe { zbus::zvariant::OwnedFd::from_raw_fd(sock1.into_raw_fd()) })
+        let data = Arc::new(ClientState {
+            compositor_state: Default::default(),
+            // Would be nice to thread config here but for now it's fine.
+            can_view_decoration_globals: false,
+            restricted: false,
+            // FIXME: maybe you can get the PID from D-Bus somehow?
+            credentials_unknown: true,
+        });
+        self.display.insert_client(sock2, data).unwrap();
+        Ok(zvariant::OwnedFd::from(std::os::fd::OwnedFd::from(sock1)))
     }
 }
 
@@ -40,7 +45,7 @@ impl ServiceChannel {
 
 impl Start for ServiceChannel {
     fn start(self) -> anyhow::Result<zbus::blocking::Connection> {
-        let conn = zbus::blocking::ConnectionBuilder::session()?
+        let conn = zbus::blocking::connection::Builder::session()?
             .name("org.gnome.Mutter.ServiceChannel")?
             .serve_at("/org/gnome/Mutter/ServiceChannel", self)?
             .build()?;

src/frame_clock.rs

@@ -7,10 +7,11 @@ use crate::utils::get_monotonic_time;
 pub struct FrameClock {
     last_presentation_time: Option<Duration>,
     refresh_interval_ns: Option<NonZeroU64>,
+    vrr: bool,
 }
 
 impl FrameClock {
-    pub fn new(refresh_interval: Option<Duration>) -> Self {
+    pub fn new(refresh_interval: Option<Duration>, vrr: bool) -> Self {
         let refresh_interval_ns = if let Some(interval) = &refresh_interval {
             assert_eq!(interval.as_secs(), 0);
             Some(NonZeroU64::new(interval.subsec_nanos().into()).unwrap())
@@ -21,6 +22,7 @@ impl FrameClock {
         Self {
             last_presentation_time: None,
             refresh_interval_ns,
+            vrr,
         }
     }
 
@@ -29,6 +31,19 @@ impl FrameClock {
             .map(|r| Duration::from_nanos(r.get()))
     }
 
+    pub fn set_vrr(&mut self, vrr: bool) {
+        if self.vrr == vrr {
+            return;
+        }
+
+        self.vrr = vrr;
+        self.last_presentation_time = None;
+    }
+
+    pub fn vrr(&self) -> bool {
+        self.vrr
+    }
+
     pub fn presented(&mut self, presentation_time: Duration) {
         if presentation_time.is_zero() {
             // Not interested in these.
@@ -71,6 +86,13 @@ impl FrameClock {
         let since_last_ns =
             since_last.as_secs() * 1_000_000_000 + u64::from(since_last.subsec_nanos());
         let to_next_ns = (since_last_ns / refresh_interval_ns + 1) * refresh_interval_ns;
-        last_presentation_time + Duration::from_nanos(to_next_ns)
+
+        // If VRR is enabled and more than one frame passed since last presentation, assume that we
+        // can present immediately.
+        if self.vrr && to_next_ns > refresh_interval_ns {
+            now
+        } else {
+            last_presentation_time + Duration::from_nanos(to_next_ns)
+        }
     }
 }

src/handlers/compositor.rs

@@ -1,23 +1,30 @@
 use std::collections::hash_map::Entry;
 
+use niri_ipc::PositionChange;
 use smithay::backend::renderer::utils::{on_commit_buffer_handler, with_renderer_surface_state};
-use smithay::input::pointer::CursorImageStatus;
+use smithay::input::pointer::{CursorImageStatus, CursorImageSurfaceData};
 use smithay::reexports::calloop::Interest;
 use smithay::reexports::wayland_server::protocol::wl_buffer;
 use smithay::reexports::wayland_server::protocol::wl_surface::WlSurface;
 use smithay::reexports::wayland_server::{Client, Resource};
 use smithay::wayland::buffer::BufferHandler;
 use smithay::wayland::compositor::{
-    add_blocker, add_pre_commit_hook, get_parent, is_sync_subsurface, send_surface_state,
+    add_blocker, add_pre_commit_hook, get_parent, is_sync_subsurface, remove_pre_commit_hook,
     with_states, BufferAssignment, CompositorClientState, CompositorHandler, CompositorState,
     SurfaceAttributes,
 };
 use smithay::wayland::dmabuf::get_dmabuf;
+use smithay::wayland::shell::xdg::XdgToplevelSurfaceData;
 use smithay::wayland::shm::{ShmHandler, ShmState};
 use smithay::{delegate_compositor, delegate_shm};
 
-use super::xdg_shell;
+use super::xdg_shell::add_mapped_toplevel_pre_commit_hook;
+use crate::handlers::XDG_ACTIVATION_TOKEN_TIMEOUT;
+use crate::layout::{ActivateWindow, AddWindowTarget};
 use crate::niri::{ClientState, State};
+use crate::utils::send_scale_transform;
+use crate::utils::transaction::Transaction;
+use crate::window::{InitialConfigureState, Mapped, ResolvedWindowRules, Unmapped};
 
 impl CompositorHandler for State {
     fn compositor_state(&mut self) -> &mut CompositorState {
@@ -35,52 +42,24 @@ impl CompositorHandler for State {
         }
 
         if let Some(output) = self.niri.output_for_root(&root) {
-            let scale = output.current_scale().integer_scale();
+            let scale = output.current_scale();
             let transform = output.current_transform();
             with_states(surface, |data| {
-                send_surface_state(surface, data, scale, transform);
+                send_scale_transform(surface, data, scale, transform);
             });
         }
     }
 
     fn new_surface(&mut self, surface: &WlSurface) {
-        add_pre_commit_hook::<Self, _>(surface, move |state, _dh, surface| {
-            let maybe_dmabuf = with_states(surface, |surface_data| {
-                surface_data
-                    .cached_state
-                    .pending::<SurfaceAttributes>()
-                    .buffer
-                    .as_ref()
-                    .and_then(|assignment| match assignment {
-                        BufferAssignment::NewBuffer(buffer) => get_dmabuf(buffer).ok(),
-                        _ => None,
-                    })
-            });
-            if let Some(dmabuf) = maybe_dmabuf {
-                if let Ok((blocker, source)) = dmabuf.generate_blocker(Interest::READ) {
-                    let client = surface.client().unwrap();
-                    let res = state
-                        .niri
-                        .event_loop
-                        .insert_source(source, move |_, _, state| {
-                            let display_handle = state.niri.display_handle.clone();
-                            state
-                                .client_compositor_state(&client)
-                                .blocker_cleared(state, &display_handle);
-                            Ok(())
-                        });
-                    if res.is_ok() {
-                        add_blocker(surface, blocker);
-                    }
-                }
-            }
-        })
+        self.add_default_dmabuf_pre_commit_hook(surface);
     }
 
     fn commit(&mut self, surface: &WlSurface) {
         let _span = tracy_client::span!("CompositorHandler::commit");
+        trace!(surface = ?surface.id(), "commit");
 
         on_commit_buffer_handler::<Self>(surface);
+        self.backend.early_import(surface);
 
         if is_sync_subsurface(surface) {
             return;
@@ -91,54 +70,260 @@ impl CompositorHandler for State {
             root_surface = parent;
         }
 
+        // Update the cached root surface.
+        self.niri
+            .root_surface
+            .insert(surface.clone(), root_surface.clone());
+
         if surface == &root_surface {
             // This is a root surface commit. It might have mapped a previously-unmapped toplevel.
             if let Entry::Occupied(entry) = self.niri.unmapped_windows.entry(surface.clone()) {
                 let is_mapped =
-                    with_renderer_surface_state(surface, |state| state.buffer().is_some());
+                    with_renderer_surface_state(surface, |state| state.buffer().is_some())
+                        .unwrap_or_else(|| {
+                            error!("no renderer surface state even though we use commit handler");
+                            false
+                        });
 
                 if is_mapped {
                     // The toplevel got mapped.
-                    let window = entry.remove();
+                    let Unmapped {
+                        window,
+                        state,
+                        activation_token_data,
+                    } = entry.remove();
+
                     window.on_commit();
 
-                    if let Some(output) = self.niri.layout.add_window(window, None, false).cloned()
-                    {
-                        self.niri.queue_redraw(output);
+                    let toplevel = window.toplevel().expect("no X11 support");
+
+                    let (rules, width, height, is_full_width, output, workspace_id) =
+                        if let InitialConfigureState::Configured {
+                            rules,
+                            width,
+                            height,
+                            floating_width: _,
+                            floating_height: _,
+                            is_full_width,
+                            output,
+                            workspace_name,
+                        } = state
+                        {
+                            // Check that the output is still connected.
+                            let output =
+                                output.filter(|o| self.niri.layout.monitor_for_output(o).is_some());
+
+                            // Check that the workspace still exists.
+                            let workspace_id = workspace_name
+                                .as_deref()
+                                .and_then(|n| self.niri.layout.find_workspace_by_name(n))
+                                .map(|(_, ws)| ws.id());
+
+                            (rules, width, height, is_full_width, output, workspace_id)
+                        } else {
+                            error!("window map must happen after initial configure");
+                            (ResolvedWindowRules::empty(), None, None, false, None, None)
+                        };
+
+                    // The GTK about dialog sets min/max size after the initial configure but
+                    // before mapping, so we need to compute open_floating at the last possible
+                    // moment, that is here.
+                    let is_floating = rules.compute_open_floating(toplevel);
+
+                    // Figure out if we should activate the window.
+                    let activate = rules.open_focused.map(|focus| {
+                        if focus {
+                            ActivateWindow::Yes
+                        } else {
+                            ActivateWindow::No
+                        }
+                    });
+                    let activate = activate.unwrap_or_else(|| {
+                        // Check the token timestamp again in case the window took a while between
+                        // requesting activation and mapping.
+                        let token = activation_token_data.filter(|token| {
+                            token.timestamp.elapsed() < XDG_ACTIVATION_TOKEN_TIMEOUT
+                        });
+                        if token.is_some() {
+                            ActivateWindow::Yes
+                        } else {
+                            let config = self.niri.config.borrow();
+                            if config.debug.strict_new_window_focus_policy {
+                                ActivateWindow::No
+                            } else {
+                                ActivateWindow::Smart
+                            }
+                        }
+                    });
+
+                    let parent = toplevel
+                        .parent()
+                        .and_then(|parent| self.niri.layout.find_window_and_output(&parent))
+                        // Only consider the parent if we configured the window for the same
+                        // output.
+                        //
+                        // Normally when we're following the parent, the configured output will be
+                        // None. If the configured output is set, that means it was set explicitly
+                        // by a window rule or a fullscreen request.
+                        .filter(|(_, parent_output)| {
+                            output.is_none() || output.as_ref() == Some(*parent_output)
+                        })
+                        .map(|(mapped, _)| mapped.window.clone());
+
+                    // The mapped pre-commit hook deals with dma-bufs on its own.
+                    self.remove_default_dmabuf_pre_commit_hook(toplevel.wl_surface());
+                    let hook = add_mapped_toplevel_pre_commit_hook(toplevel);
+                    let mapped = Mapped::new(window, rules, hook);
+                    let window = mapped.window.clone();
+
+                    let target = if let Some(p) = &parent {
+                        // Open dialogs next to their parent window.
+                        AddWindowTarget::NextTo(p)
+                    } else if let Some(id) = workspace_id {
+                        AddWindowTarget::Workspace(id)
+                    } else if let Some(output) = &output {
+                        AddWindowTarget::Output(output)
+                    } else {
+                        AddWindowTarget::Auto
+                    };
+                    let output = self.niri.layout.add_window(
+                        mapped,
+                        target,
+                        width,
+                        height,
+                        is_full_width,
+                        is_floating,
+                        activate,
+                    );
+
+                    if let Some(output) = output.cloned() {
+                        self.niri.layout.start_open_animation_for_window(&window);
+
+                        let new_focus = self.niri.layout.focus().map(|m| &m.window);
+                        if new_focus == Some(&window) {
+                            // We activated the newly opened window.
+                            self.maybe_warp_cursor_to_focus();
+                            self.niri.layer_shell_on_demand_focus = None;
+                        }
+
+                        self.niri.queue_redraw(&output);
                     }
                     return;
                 }
 
                 // The toplevel remains unmapped.
-                let window = entry.get();
-                xdg_shell::send_initial_configure_if_needed(window.toplevel());
+                let unmapped = entry.get();
+                if unmapped.needs_initial_configure() {
+                    let toplevel = unmapped.window.toplevel().expect("no x11 support").clone();
+                    self.queue_initial_configure(toplevel);
+                }
                 return;
             }
 
             // This is a commit of a previously-mapped root or a non-toplevel root.
-            if let Some((window, output)) = self.niri.layout.find_window_and_output(surface) {
-                // This is a commit of a previously-mapped toplevel.
-                window.on_commit();
+            if let Some((mapped, output)) = self.niri.layout.find_window_and_output(surface) {
+                let window = mapped.window.clone();
+                let output = output.clone();
+
+                #[cfg(feature = "xdp-gnome-screencast")]
+                let id = mapped.id();
 
                 // This is a commit of a previously-mapped toplevel.
                 let is_mapped =
-                    with_renderer_surface_state(surface, |state| state.buffer().is_some());
+                    with_renderer_surface_state(surface, |state| state.buffer().is_some())
+                        .unwrap_or_else(|| {
+                            error!("no renderer surface state even though we use commit handler");
+                            false
+                        });
+
+                // Must start the close animation before window.on_commit().
+                let transaction = Transaction::new();
+                if !is_mapped {
+                    let blocker = transaction.blocker();
+                    self.backend.with_primary_renderer(|renderer| {
+                        self.niri
+                            .layout
+                            .start_close_animation_for_window(renderer, &window, blocker);
+                    });
+                }
+
+                window.on_commit();
 
                 if !is_mapped {
                     // The toplevel got unmapped.
-                    self.niri.layout.remove_window(&window);
-                    self.niri.unmapped_windows.insert(surface.clone(), window);
-                    self.niri.queue_redraw(output);
+                    //
+                    // Test client: wleird-unmap.
+                    let active_window = self.niri.layout.focus().map(|m| &m.window);
+                    let was_active = active_window == Some(&window);
+
+                    #[cfg(feature = "xdp-gnome-screencast")]
+                    self.niri
+                        .stop_casts_for_target(crate::pw_utils::CastTarget::Window {
+                            id: id.get(),
+                        });
+
+                    self.niri.layout.remove_window(&window, transaction.clone());
+                    self.add_default_dmabuf_pre_commit_hook(surface);
+
+                    // If this is the only instance, then this transaction will complete
+                    // immediately, so no need to set the timer.
+                    if !transaction.is_last() {
+                        transaction.register_deadline_timer(&self.niri.event_loop);
+                    }
+
+                    if was_active {
+                        self.maybe_warp_cursor_to_focus();
+                    }
+
+                    // Newly-unmapped toplevels must perform the initial commit-configure sequence
+                    // afresh.
+                    let unmapped = Unmapped::new(window);
+                    self.niri.unmapped_windows.insert(surface.clone(), unmapped);
+
+                    self.niri.queue_redraw(&output);
                     return;
                 }
 
+                let (serial, buffer_delta) = with_states(surface, |states| {
+                    let buffer_delta = states
+                        .cached_state
+                        .get::<SurfaceAttributes>()
+                        .current()
+                        .buffer_delta
+                        .take();
+
+                    let role = states
+                        .data_map
+                        .get::<XdgToplevelSurfaceData>()
+                        .unwrap()
+                        .lock()
+                        .unwrap();
+                    (role.configure_serial, buffer_delta)
+                });
+                if serial.is_none() {
+                    error!("commit on a mapped surface without a configured serial");
+                }
+
                 // The toplevel remains mapped.
-                self.niri.layout.update_window(&window);
+                self.niri.layout.update_window(&window, serial);
+
+                // Move the toplevel according to the attach offset.
+                if let Some(delta) = buffer_delta {
+                    if delta.x != 0 || delta.y != 0 {
+                        let (x, y) = delta.to_f64().into();
+                        self.niri.layout.move_floating_window(
+                            Some(&window),
+                            PositionChange::AdjustFixed(x),
+                            PositionChange::AdjustFixed(y),
+                            false,
+                        );
+                    }
+                }
 
                 // Popup placement depends on window size which might have changed.
-                self.update_reactive_popups(&window, &output);
+                self.update_reactive_popups(&window);
 
-                self.niri.queue_redraw(output);
+                self.niri.queue_redraw(&output);
                 return;
             }
 
@@ -147,10 +332,12 @@ impl CompositorHandler for State {
 
         // This is a commit of a non-root or a non-toplevel root.
         let root_window_output = self.niri.layout.find_window_and_output(&root_surface);
-        if let Some((window, output)) = root_window_output {
+        if let Some((mapped, output)) = root_window_output {
+            let window = mapped.window.clone();
+            let output = output.clone();
             window.on_commit();
-            self.niri.layout.update_window(&window);
-            self.niri.queue_redraw(output);
+            self.niri.layout.update_window(&window, None);
+            self.niri.queue_redraw(&output);
             return;
         }
 
@@ -158,38 +345,110 @@ impl CompositorHandler for State {
         self.popups_handle_commit(surface);
         if let Some(popup) = self.niri.popups.find_popup(surface) {
             if let Some(output) = self.output_for_popup(&popup) {
-                self.niri.queue_redraw(output);
+                self.niri.queue_redraw(&output.clone());
             }
+            return;
         }
 
         // This might be a layer-shell surface.
-        self.layer_shell_handle_commit(surface);
+        if self.layer_shell_handle_commit(surface) {
+            return;
+        }
 
         // This might be a cursor surface.
-        if matches!(&self.niri.cursor_manager.cursor_image(), CursorImageStatus::Surface(s) if s == surface)
-        {
+        if matches!(
+            &self.niri.cursor_manager.cursor_image(),
+            CursorImageStatus::Surface(s) if s == &root_surface
+        ) {
+            // In case the cursor surface has been committed handle the role specific
+            // buffer offset by applying the offset on the cursor image hotspot
+            if surface == &root_surface {
+                with_states(surface, |states| {
+                    let cursor_image_attributes = states.data_map.get::<CursorImageSurfaceData>();
+
+                    if let Some(mut cursor_image_attributes) =
+                        cursor_image_attributes.map(|attrs| attrs.lock().unwrap())
+                    {
+                        let buffer_delta = states
+                            .cached_state
+                            .get::<SurfaceAttributes>()
+                            .current()
+                            .buffer_delta
+                            .take();
+                        if let Some(buffer_delta) = buffer_delta {
+                            cursor_image_attributes.hotspot -= buffer_delta;
+                        }
+                    }
+                });
+            }
+
             // FIXME: granular redraws for cursors.
             self.niri.queue_redraw_all();
+            return;
         }
 
         // This might be a DnD icon surface.
-        if self.niri.dnd_icon.as_ref() == Some(surface) {
+        if matches!(&self.niri.dnd_icon, Some(icon) if icon.surface == root_surface) {
+            let dnd_icon = self.niri.dnd_icon.as_mut().unwrap();
+
+            // In case the dnd surface has been committed handle the role specific
+            // buffer offset by applying the offset on the dnd icon offset
+            if surface == &dnd_icon.surface {
+                with_states(&dnd_icon.surface, |states| {
+                    let buffer_delta = states
+                        .cached_state
+                        .get::<SurfaceAttributes>()
+                        .current()
+                        .buffer_delta
+                        .take()
+                        .unwrap_or_default();
+                    dnd_icon.offset += buffer_delta;
+                });
+            }
+
             // FIXME: granular redraws for cursors.
             self.niri.queue_redraw_all();
+            return;
         }
 
         // This might be a lock surface.
         if self.niri.is_locked() {
             for (output, state) in &self.niri.output_state {
                 if let Some(lock_surface) = &state.lock_surface {
-                    if lock_surface.wl_surface() == surface {
-                        self.niri.queue_redraw(output.clone());
-                        break;
+                    if lock_surface.wl_surface() == &root_surface {
+                        self.niri.queue_redraw(&output.clone());
+                        return;
                     }
                 }
             }
         }
     }
+
+    fn destroyed(&mut self, surface: &WlSurface) {
+        // Clients may destroy their subsurfaces before the main surface. Ensure we have a snapshot
+        // when that happens, so that the closing animation includes all these subsurfaces.
+        //
+        // Test client: alacritty with CSD <= 0.13 (it was fixed in winit afterwards:
+        // https://github.com/rust-windowing/winit/pull/3625).
+        //
+        // This is still not perfect, as this function is called already after the (first)
+        // subsurface is destroyed; in the case of alacritty, this is the top CSD shadow. But, it
+        // gets most of the job done.
+        if let Some(root) = self.niri.root_surface.get(surface) {
+            if let Some((mapped, _)) = self.niri.layout.find_window_and_output(root) {
+                let window = mapped.window.clone();
+                self.backend.with_primary_renderer(|renderer| {
+                    self.niri.layout.store_unmap_snapshot(renderer, &window);
+                });
+            }
+        }
+
+        self.niri
+            .root_surface
+            .retain(|k, v| k != surface && v != surface);
+
+        self.niri.dmabuf_pre_commit_hook.remove(surface);
+    }
 }
 
 impl BufferHandler for State {
@@ -204,3 +463,57 @@ impl ShmHandler for State {
 
 delegate_compositor!(State);
 delegate_shm!(State);
+
+impl State {
+    pub fn add_default_dmabuf_pre_commit_hook(&mut self, surface: &WlSurface) {
+        let hook = add_pre_commit_hook::<Self, _>(surface, move |state, _dh, surface| {
+            let maybe_dmabuf = with_states(surface, |surface_data| {
+                surface_data
+                    .cached_state
+                    .get::<SurfaceAttributes>()
+                    .pending()
+                    .buffer
+                    .as_ref()
+                    .and_then(|assignment| match assignment {
+                        BufferAssignment::NewBuffer(buffer) => get_dmabuf(buffer).cloned().ok(),
+                        _ => None,
+                    })
+            });
+            if let Some(dmabuf) = maybe_dmabuf {
+                if let Ok((blocker, source)) = dmabuf.generate_blocker(Interest::READ) {
+                    if let Some(client) = surface.client() {
+                        let res =
+                            state
+                                .niri
+                                .event_loop
+                                .insert_source(source, move |_, _, state| {
+                                    let display_handle = state.niri.display_handle.clone();
+                                    state
+                                        .client_compositor_state(&client)
+                                        .blocker_cleared(state, &display_handle);
+                                    Ok(())
+                                });
+                        if res.is_ok() {
+                            add_blocker(surface, blocker);
+                            trace!("added default dmabuf blocker");
+                        }
+                    }
+                }
+            }
+        });
+
+        let s = surface.clone();
+        if let Some(prev) = self.niri.dmabuf_pre_commit_hook.insert(s, hook) {
+            error!("tried to add dmabuf pre-commit hook when there was already one");
+            remove_pre_commit_hook(surface, prev);
+        }
+    }
+
+    pub fn remove_default_dmabuf_pre_commit_hook(&mut self, surface: &WlSurface) {
+        if let Some(hook) = self.niri.dmabuf_pre_commit_hook.remove(surface) {
+            remove_pre_commit_hook(surface, hook);
+        } else {
+            error!("tried to remove dmabuf pre-commit hook but there was none");
+        }
+    }
+}

src/handlers/layer_shell.rs

@@ -1,16 +1,19 @@
+use smithay::backend::renderer::utils::with_renderer_surface_state;
 use smithay::delegate_layer_shell;
-use smithay::desktop::{layer_map_for_output, LayerSurface, WindowSurfaceType};
+use smithay::desktop::{layer_map_for_output, LayerSurface, PopupKind, WindowSurfaceType};
 use smithay::output::Output;
 use smithay::reexports::wayland_server::protocol::wl_output::WlOutput;
 use smithay::reexports::wayland_server::protocol::wl_surface::WlSurface;
-use smithay::wayland::compositor::{send_surface_state, with_states};
+use smithay::wayland::compositor::{get_parent, with_states};
 use smithay::wayland::shell::wlr_layer::{
-    Layer, LayerSurface as WlrLayerSurface, LayerSurfaceData, WlrLayerShellHandler,
+    self, Layer, LayerSurface as WlrLayerSurface, LayerSurfaceData, WlrLayerShellHandler,
     WlrLayerShellState,
 };
 use smithay::wayland::shell::xdg::PopupSurface;
 
+use crate::layer::{MappedLayer, ResolvedLayerRules};
 use crate::niri::State;
+use crate::utils::send_scale_transform;
 
 impl WlrLayerShellHandler for State {
     fn shell_state(&mut self) -> &mut WlrLayerShellState {
@@ -24,17 +27,30 @@ impl WlrLayerShellHandler for State {
         _layer: Layer,
         namespace: String,
     ) {
-        let output = wl_output
-            .as_ref()
-            .and_then(Output::from_resource)
-            .or_else(|| self.niri.layout.active_output().cloned())
-            .unwrap();
+        let output = if let Some(wl_output) = &wl_output {
+            Output::from_resource(wl_output)
+        } else {
+            self.niri.layout.active_output().cloned()
+        };
+        let Some(output) = output else {
+            warn!("no output for new layer surface, closing");
+            surface.send_close();
+            return;
+        };
+
+        let wl_surface = surface.wl_surface().clone();
+        let is_new = self.niri.unmapped_layer_surfaces.insert(wl_surface);
+        assert!(is_new);
+
         let mut map = layer_map_for_output(&output);
         map.map_layer(&LayerSurface::new(surface, namespace))
             .unwrap();
     }
 
     fn layer_destroyed(&mut self, surface: WlrLayerSurface) {
+        let wl_surface = surface.wl_surface();
+        self.niri.unmapped_layer_surfaces.remove(wl_surface);
+
         let output = if let Some((output, mut map, layer)) =
             self.niri.layout.outputs().find_map(|o| {
                 let map = layer_map_for_output(o);
@@ -45,68 +61,134 @@ impl WlrLayerShellHandler for State {
                 layer.map(|layer| (o.clone(), map, layer))
             }) {
             map.unmap_layer(&layer);
+            self.niri.mapped_layer_surfaces.remove(&layer);
             Some(output)
         } else {
             None
         };
         if let Some(output) = output {
-            self.niri.output_resized(output);
+            self.niri.output_resized(&output);
         }
     }
 
     fn new_popup(&mut self, _parent: WlrLayerSurface, popup: PopupSurface) {
-        self.unconstrain_popup(&popup);
+        self.unconstrain_popup(&PopupKind::Xdg(popup));
     }
 }
 delegate_layer_shell!(State);
 
 impl State {
-    pub fn layer_shell_handle_commit(&mut self, surface: &WlSurface) {
-        let Some(output) = self
+    pub fn layer_shell_handle_commit(&mut self, surface: &WlSurface) -> bool {
+        let mut root_surface = surface.clone();
+        while let Some(parent) = get_parent(&root_surface) {
+            root_surface = parent;
+        }
+
+        let output = self
             .niri
             .layout
             .outputs()
             .find(|o| {
                 let map = layer_map_for_output(o);
-                map.layer_for_surface(surface, WindowSurfaceType::TOPLEVEL)
+                map.layer_for_surface(&root_surface, WindowSurfaceType::TOPLEVEL)
                     .is_some()
             })
-            .cloned()
-        else {
-            return;
+            .cloned();
+        let Some(output) = output else {
+            return false;
         };
 
-        let initial_configure_sent = with_states(surface, |states| {
-            states
-                .data_map
-                .get::<LayerSurfaceData>()
-                .unwrap()
-                .lock()
-                .unwrap()
-                .initial_configure_sent
-        });
+        if surface == &root_surface {
+            let initial_configure_sent = with_states(surface, |states| {
+                states
+                    .data_map
+                    .get::<LayerSurfaceData>()
+                    .unwrap()
+                    .lock()
+                    .unwrap()
+                    .initial_configure_sent
+            });
 
-        let mut map = layer_map_for_output(&output);
+            let mut map = layer_map_for_output(&output);
+
+            // Arrange the layers before sending the initial configure to respect any size the
+            // client may have sent.
+            map.arrange();
 
-        // arrange the layers before sending the initial configure
-        // to respect any size the client may have sent
-        map.arrange();
-        // send the initial configure if relevant
-        if !initial_configure_sent {
             let layer = map
                 .layer_for_surface(surface, WindowSurfaceType::TOPLEVEL)
                 .unwrap();
 
-            let scale = output.current_scale().integer_scale();
-            let transform = output.current_transform();
-            with_states(surface, |data| {
-                send_surface_state(surface, data, scale, transform);
-            });
+            if initial_configure_sent {
+                let is_mapped =
+                    with_renderer_surface_state(surface, |state| state.buffer().is_some())
+                        .unwrap_or_else(|| {
+                            error!("no renderer surface state even though we use commit handler");
+                            false
+                        });
 
-            layer.layer_surface().send_configure();
+                if is_mapped {
+                    let was_unmapped = self.niri.unmapped_layer_surfaces.remove(surface);
+
+                    // Resolve rules for newly mapped layer surfaces.
+                    if was_unmapped {
+                        let rules = &self.niri.config.borrow().layer_rules;
+                        let rules =
+                            ResolvedLayerRules::compute(rules, layer, self.niri.is_at_startup);
+                        let mapped = MappedLayer::new(layer.clone(), rules);
+                        let prev = self
+                            .niri
+                            .mapped_layer_surfaces
+                            .insert(layer.clone(), mapped);
+                        if prev.is_some() {
+                            error!("MappedLayer was present for an unmapped surface");
+                        }
+                    }
+
+                    // Give focus to newly mapped on-demand surfaces. Some launchers like
+                    // lxqt-runner rely on this behavior. While this behavior doesn't make much
+                    // sense for other clients like panels, the consensus seems to be that it's not
+                    // a big deal since panels generally only open once at the start of the
+                    // session.
+                    //
+                    // Note that:
+                    // 1) Exclusive layer surfaces already get focus automatically in
+                    //    update_keyboard_focus().
+                    // 2) Same-layer exclusive layer surfaces are already preferred to on-demand
+                    //    surfaces in update_keyboard_focus(), so we don't need to check for that
+                    //    here.
+                    //
+                    // https://github.com/YaLTeR/niri/issues/641
+                    let on_demand = layer.cached_state().keyboard_interactivity
+                        == wlr_layer::KeyboardInteractivity::OnDemand;
+                    if was_unmapped && on_demand {
+                        // I guess it'd make sense to check that no higher-layer on-demand surface
+                        // has focus, but Smithay's Layer doesn't implement Ord so this would be a
+                        // little annoying.
+                        self.niri.layer_shell_on_demand_focus = Some(layer.clone());
+                    }
+                } else {
+                    self.niri.mapped_layer_surfaces.remove(layer);
+                    self.niri.unmapped_layer_surfaces.insert(surface.clone());
+                }
+            } else {
+                let scale = output.current_scale();
+                let transform = output.current_transform();
+                with_states(surface, |data| {
+                    send_scale_transform(surface, data, scale, transform);
+                });
+
+                layer.layer_surface().send_configure();
+            }
+            drop(map);
+
+            // This will call queue_redraw() inside.
+            self.niri.output_resized(&output);
+        } else {
+            // This is an unsync layer-shell subsurface.
+            self.niri.queue_redraw(&output);
         }
-        drop(map);
 
-        self.niri.output_resized(output);
+        true
     }
 }

src/handlers/mod.rs

@@ -7,22 +7,39 @@ use std::io::Write;
 use std::os::fd::OwnedFd;
 use std::sync::Arc;
 use std::thread;
+use std::time::Duration;
 
 use smithay::backend::allocator::dmabuf::Dmabuf;
-use smithay::backend::renderer::ImportDma;
+use smithay::backend::drm::DrmNode;
+use smithay::backend::input::TabletToolDescriptor;
 use smithay::desktop::{PopupKind, PopupManager};
-use smithay::input::pointer::{CursorIcon, CursorImageStatus, PointerHandle};
-use smithay::input::{Seat, SeatHandler, SeatState};
+use smithay::input::pointer::{
+    CursorIcon, CursorImageStatus, CursorImageSurfaceData, PointerHandle,
+};
+use smithay::input::{keyboard, Seat, SeatHandler, SeatState};
 use smithay::output::Output;
+use smithay::reexports::rustix::fs::{fcntl_setfl, OFlags};
+use smithay::reexports::wayland_protocols::xdg::shell::server::xdg_toplevel;
+use smithay::reexports::wayland_protocols_wlr::screencopy::v1::server::zwlr_screencopy_manager_v1::ZwlrScreencopyManagerV1;
 use smithay::reexports::wayland_server::protocol::wl_data_source::WlDataSource;
 use smithay::reexports::wayland_server::protocol::wl_output::WlOutput;
 use smithay::reexports::wayland_server::protocol::wl_surface::WlSurface;
 use smithay::reexports::wayland_server::Resource;
-use smithay::utils::{Logical, Rectangle, Size};
-use smithay::wayland::compositor::{send_surface_state, with_states};
+use smithay::utils::{Logical, Point, Rectangle, Size};
+use smithay::wayland::compositor::{get_parent, with_states};
 use smithay::wayland::dmabuf::{DmabufGlobal, DmabufHandler, DmabufState, ImportNotifier};
+use smithay::wayland::drm_lease::{
+    DrmLease, DrmLeaseBuilder, DrmLeaseHandler, DrmLeaseRequest, DrmLeaseState, LeaseRejected,
+};
+use smithay::wayland::fractional_scale::FractionalScaleHandler;
+use smithay::wayland::idle_inhibit::IdleInhibitHandler;
+use smithay::wayland::idle_notify::{IdleNotifierHandler, IdleNotifierState};
 use smithay::wayland::input_method::{InputMethodHandler, PopupSurface};
-use smithay::wayland::pointer_constraints::PointerConstraintsHandler;
+use smithay::wayland::output::OutputHandler;
+use smithay::wayland::pointer_constraints::{with_pointer_constraint, PointerConstraintsHandler};
+use smithay::wayland::security_context::{
+    SecurityContext, SecurityContextHandler, SecurityContextListenerSource,
+};
 use smithay::wayland::selection::data_device::{
     set_data_device_focus, ClientDndGrabHandler, DataDeviceHandler, DataDeviceState,
     ServerDndGrabHandler,
@@ -35,20 +52,41 @@ use smithay::wayland::selection::{SelectionHandler, SelectionTarget};
 use smithay::wayland::session_lock::{
     LockSurface, SessionLockHandler, SessionLockManagerState, SessionLocker,
 };
+use smithay::wayland::tablet_manager::TabletSeatHandler;
+use smithay::wayland::xdg_activation::{
+    XdgActivationHandler, XdgActivationState, XdgActivationToken, XdgActivationTokenData,
+};
 use smithay::{
     delegate_cursor_shape, delegate_data_control, delegate_data_device, delegate_dmabuf,
+    delegate_drm_lease, delegate_fractional_scale, delegate_idle_inhibit, delegate_idle_notify,
     delegate_input_method_manager, delegate_output, delegate_pointer_constraints,
     delegate_pointer_gestures, delegate_presentation, delegate_primary_selection,
-    delegate_relative_pointer, delegate_seat, delegate_session_lock, delegate_tablet_manager,
-    delegate_text_input_manager, delegate_virtual_keyboard_manager,
+    delegate_relative_pointer, delegate_seat, delegate_security_context, delegate_session_lock,
+    delegate_single_pixel_buffer, delegate_tablet_manager, delegate_text_input_manager,
+    delegate_viewporter, delegate_virtual_keyboard_manager, delegate_xdg_activation,
 };
 
-use crate::layout::output_size;
-use crate::niri::State;
+pub use crate::handlers::xdg_shell::KdeDecorationsModeState;
+use crate::niri::{ClientState, DndIcon, State};
+use crate::protocols::foreign_toplevel::{
+    self, ForeignToplevelHandler, ForeignToplevelManagerState,
+};
+use crate::protocols::gamma_control::{GammaControlHandler, GammaControlManagerState};
+use crate::protocols::mutter_x11_interop::MutterX11InteropHandler;
+use crate::protocols::output_management::{OutputManagementHandler, OutputManagementManagerState};
+use crate::protocols::screencopy::{Screencopy, ScreencopyHandler, ScreencopyManagerState};
+use crate::utils::{output_size, send_scale_transform, with_toplevel_role};
+use crate::{
+    delegate_foreign_toplevel, delegate_gamma_control, delegate_mutter_x11_interop,
+    delegate_output_management, delegate_screencopy,
+};
+
+pub const XDG_ACTIVATION_TOKEN_TIMEOUT: Duration = Duration::from_secs(10);
 
 impl SeatHandler for State {
     type KeyboardFocus = WlSurface;
     type PointerFocus = WlSurface;
+    type TouchFocus = WlSurface;
 
     fn seat_state(&mut self) -> &mut SeatState<State> {
         &mut self.niri.seat_state
@@ -71,49 +109,136 @@ impl SeatHandler for State {
         set_data_device_focus(dh, seat, client.clone());
         set_primary_focus(dh, seat, client);
     }
+
+    fn led_state_changed(&mut self, _seat: &Seat<Self>, led_state: keyboard::LedState) {
+        let keyboards = self
+            .niri
+            .devices
+            .iter()
+            .filter(|device| device.has_capability(input::DeviceCapability::Keyboard))
+            .cloned();
+
+        for mut keyboard in keyboards {
+            keyboard.led_update(led_state.into());
+        }
+    }
 }
 delegate_seat!(State);
 delegate_cursor_shape!(State);
-delegate_tablet_manager!(State);
 delegate_pointer_gestures!(State);
 delegate_relative_pointer!(State);
 delegate_text_input_manager!(State);
 
+impl TabletSeatHandler for State {
+    fn tablet_tool_image(&mut self, _tool: &TabletToolDescriptor, image: CursorImageStatus) {
+        // FIXME: tablet tools should have their own cursors.
+        self.niri.cursor_manager.set_cursor_image(image);
+        // FIXME: granular.
+        self.niri.queue_redraw_all();
+    }
+}
+delegate_tablet_manager!(State);
+
 impl PointerConstraintsHandler for State {
-    fn new_constraint(&mut self, _surface: &WlSurface, pointer: &PointerHandle<Self>) {
-        self.niri.maybe_activate_pointer_constraint(
-            pointer.current_location(),
-            &self.niri.pointer_focus,
-        );
+    fn new_constraint(&mut self, _surface: &WlSurface, _pointer: &PointerHandle<Self>) {
+        // Pointer constraints track pointer focus internally, so make sure it's up to date before
+        // activating a new one.
+        self.refresh_pointer_contents();
+
+        self.niri.maybe_activate_pointer_constraint();
+    }
+
+    fn cursor_position_hint(
+        &mut self,
+        surface: &WlSurface,
+        pointer: &PointerHandle<Self>,
+        location: Point<f64, Logical>,
+    ) {
+        let is_constraint_active = with_pointer_constraint(surface, pointer, |constraint| {
+            constraint.is_some_and(|c| c.is_active())
+        });
+
+        if !is_constraint_active {
+            return;
+        }
+
+        // Note: this is surface under pointer, not pointer focus. So if you start, say, a
+        // middle-drag in Blender, then touchpad-swipe the window away, the surface under pointer
+        // will change, even though the real pointer focus remains on the Blender surface due to
+        // the click grab.
+        //
+        // Ideally we would just use the constraint surface, but we need its origin. So this is
+        // more of a hack because pointer contents has the surface origin available.
+        //
+        // FIXME: use the constraint surface somehow, don't use pointer contents.
+        let Some((ref surface_under_pointer, origin)) = self.niri.pointer_contents.surface else {
+            return;
+        };
+
+        if surface_under_pointer != surface {
+            return;
+        }
+
+        let mut root = surface.clone();
+        while let Some(parent) = get_parent(&root) {
+            root = parent;
+        }
+
+        let target = self
+            .niri
+            .output_for_root(&root)
+            .and_then(|output| self.niri.global_space.output_geometry(output))
+            .map_or(origin + location, |mut output_geometry| {
+                // i32 sizes are exclusive, but f64 sizes are inclusive.
+                output_geometry.size -= (1, 1).into();
+                (origin + location).constrain(output_geometry.to_f64())
+            });
+        pointer.set_location(target);
+
+        // Redraw to update the cursor position if it's visible.
+        if !self.niri.pointer_hidden {
+            // FIXME: redraw only outputs overlapping the cursor.
+            self.niri.queue_redraw_all();
+        }
     }
 }
 delegate_pointer_constraints!(State);
 
 impl InputMethodHandler for State {
     fn new_popup(&mut self, surface: PopupSurface) {
-        let popup = PopupKind::from(surface.clone());
+        let popup = PopupKind::InputMethod(surface);
         if let Some(output) = self.output_for_popup(&popup) {
-            let scale = output.current_scale().integer_scale();
+            let scale = output.current_scale();
             let transform = output.current_transform();
-            let wl_surface = surface.wl_surface();
+            let wl_surface = popup.wl_surface();
             with_states(wl_surface, |data| {
-                send_surface_state(wl_surface, data, scale, transform);
+                send_scale_transform(wl_surface, data, scale, transform);
             });
         }
+
+        self.unconstrain_popup(&popup);
+
         if let Err(err) = self.niri.popups.track_popup(popup) {
             warn!("error tracking ime popup {err:?}");
         }
     }
+
+    fn popup_repositioned(&mut self, surface: PopupSurface) {
+        let popup = PopupKind::InputMethod(surface);
+        self.unconstrain_popup(&popup);
+    }
+
     fn dismiss_popup(&mut self, surface: PopupSurface) {
         if let Some(parent) = surface.get_parent().map(|parent| parent.surface.clone()) {
             let _ = PopupManager::dismiss_popup(&parent, &PopupKind::from(surface));
         }
     }
+
     fn parent_geometry(&self, parent: &WlSurface) -> Rectangle<i32, Logical> {
         self.niri
             .layout
             .find_window_and_output(parent)
-            .map(|(window, _)| window.geometry())
+            .map(|(mapped, _)| mapped.window.geometry())
             .unwrap_or_default()
     }
 }
@@ -136,6 +261,10 @@ impl SelectionHandler for State {
 
         let buf = user_data.clone();
         thread::spawn(move || {
+            // Clear O_NONBLOCK, otherwise File::write_all() will stop halfway.
+            if let Err(err) = fcntl_setfl(&fd, OFlags::empty()) {
+                warn!("error clearing flags on selection target fd: {err:?}");
+            }
             if let Err(err) = File::from(fd).write_all(&buf) {
                 warn!("error writing selection: {err:?}");
             }
@@ -156,12 +285,61 @@ impl ClientDndGrabHandler for State {
         icon: Option<WlSurface>,
         _seat: Seat<Self>,
     ) {
-        self.niri.dnd_icon = icon;
+        let offset = if let CursorImageStatus::Surface(ref surface) =
+            self.niri.cursor_manager.cursor_image()
+        {
+            with_states(surface, |states| {
+                let hotspot = states
+                    .data_map
+                    .get::<CursorImageSurfaceData>()
+                    .unwrap()
+                    .lock()
+                    .unwrap()
+                    .hotspot;
+                Point::from((-hotspot.x, -hotspot.y))
+            })
+        } else {
+            (0, 0).into()
+        };
+        self.niri.dnd_icon = icon.map(|surface| DndIcon { surface, offset });
         // FIXME: more granular
         self.niri.queue_redraw_all();
     }
 
-    fn dropped(&mut self, _seat: Seat<Self>) {
+    fn dropped(&mut self, target: Option<WlSurface>, validated: bool, _seat: Seat<Self>) {
+        trace!("client dropped, target: {target:?}, validated: {validated}");
+
+        // Activate the target output, since that's how Firefox drag-tab-into-new-window works for
+        // example. On successful drop, additionally activate the target window.
+        let mut activate_output = true;
+        if let Some(target) = validated.then_some(target).flatten() {
+            if let Some(root) = self.niri.root_surface.get(&target) {
+                if let Some((mapped, _)) = self.niri.layout.find_window_and_output(root) {
+                    let window = mapped.window.clone();
+                    self.niri.layout.activate_window(&window);
+                    self.niri.layer_shell_on_demand_focus = None;
+                    activate_output = false;
+                }
+            }
+        }
+
+        if activate_output {
+            // Find the output from cursor coordinates.
+            //
+            // FIXME: uhhh, we can't actually properly tell if the DnD comes from pointer or touch,
+            // and if it comes from touch, then what the coordinates are. Need to pass more
+            // parameters from Smithay I guess.
+            //
+            // Assume that hidden pointer means touch DnD.
+            if !self.niri.pointer_hidden {
+                // We can't even get the current pointer location because it's locked (we're deep
+                // in the grab call stack here). So use the last known one.
+                if let Some(output) = &self.niri.pointer_contents.output {
+                    self.niri.layout.activate_output(output);
+                }
+            }
+        }
+
         self.niri.dnd_icon = None;
         // FIXME: more granular
         self.niri.queue_redraw_all();
@@ -187,13 +365,18 @@ impl DataControlHandler for State {
 
 delegate_data_control!(State);
 
+impl OutputHandler for State {
+    fn output_bound(&mut self, output: Output, wl_output: WlOutput) {
+        foreign_toplevel::on_output_bound(self, &output, &wl_output);
+    }
+}
 delegate_output!(State);
 
 delegate_presentation!(State);
 
 impl DmabufHandler for State {
     fn dmabuf_state(&mut self) -> &mut DmabufState {
-        self.backend.tty().dmabuf_state()
+        &mut self.niri.dmabuf_state
     }
 
     fn dmabuf_imported(
@@ -202,17 +385,10 @@ impl DmabufHandler for State {
         dmabuf: Dmabuf,
         notifier: ImportNotifier,
     ) {
-        let renderer = self.backend.renderer().expect(
-            "the dmabuf global must be created and destroyed together with the output device",
-        );
-        match renderer.import_dmabuf(&dmabuf, None) {
-            Ok(_texture) => {
-                let _ = notifier.successful::<State>();
-            }
-            Err(err) => {
-                debug!("error importing dmabuf: {err:?}");
-                notifier.failed();
-            }
+        if self.backend.import_dmabuf(&dmabuf) {
+            let _ = notifier.successful::<State>();
+        } else {
+            notifier.failed();
         }
     }
 }
@@ -229,11 +405,15 @@ impl SessionLockHandler for State {
 
     fn unlock(&mut self) {
         self.niri.unlock();
+        self.niri.activate_monitors(&mut self.backend);
+        self.niri
+            .idle_notifier_state
+            .notify_activity(&self.niri.seat);
     }
 
     fn new_surface(&mut self, surface: LockSurface, output: WlOutput) {
         let Some(output) = Output::from_resource(&output) else {
-            error!("no Output matching WlOutput");
+            warn!("no Output matching WlOutput");
             return;
         };
 
@@ -248,11 +428,279 @@ pub fn configure_lock_surface(surface: &LockSurface, output: &Output) {
         let size = output_size(output);
         states.size = Some(Size::from((size.w as u32, size.h as u32)));
     });
-    let scale = output.current_scale().integer_scale();
+    let scale = output.current_scale();
     let transform = output.current_transform();
     let wl_surface = surface.wl_surface();
     with_states(wl_surface, |data| {
-        send_surface_state(wl_surface, data, scale, transform);
+        send_scale_transform(wl_surface, data, scale, transform);
     });
     surface.send_configure();
 }
+
+impl SecurityContextHandler for State {
+    fn context_created(&mut self, source: SecurityContextListenerSource, context: SecurityContext) {
+        self.niri
+            .event_loop
+            .insert_source(source, move |client, _, state| {
+                let config = state.niri.config.borrow();
+                let data = Arc::new(ClientState {
+                    compositor_state: Default::default(),
+                    can_view_decoration_globals: config.prefer_no_csd,
+                    restricted: true,
+                    credentials_unknown: false,
+                });
+
+                if let Err(err) = state.niri.display_handle.insert_client(client, data) {
+                    warn!("error inserting client: {err}");
+                } else {
+                    trace!("inserted a new restricted client, context={context:?}");
+                }
+            })
+            .unwrap();
+    }
+}
+delegate_security_context!(State);
+
+impl IdleNotifierHandler for State {
+    fn idle_notifier_state(&mut self) -> &mut IdleNotifierState<Self> {
+        &mut self.niri.idle_notifier_state
+    }
+}
+delegate_idle_notify!(State);
+
+impl IdleInhibitHandler for State {
+    fn inhibit(&mut self, surface: WlSurface) {
+        self.niri.idle_inhibiting_surfaces.insert(surface);
+    }
+
+    fn uninhibit(&mut self, surface: WlSurface) {
+        self.niri.idle_inhibiting_surfaces.remove(&surface);
+    }
+}
+delegate_idle_inhibit!(State);
+
+impl ForeignToplevelHandler for State {
+    fn foreign_toplevel_manager_state(&mut self) -> &mut ForeignToplevelManagerState {
+        &mut self.niri.foreign_toplevel_state
+    }
+
+    fn activate(&mut self, wl_surface: WlSurface) {
+        if let Some((mapped, _)) = self.niri.layout.find_window_and_output(&wl_surface) {
+            let window = mapped.window.clone();
+            self.niri.layout.activate_window(&window);
+            self.niri.layer_shell_on_demand_focus = None;
+            self.niri.queue_redraw_all();
+        }
+    }
+
+    fn close(&mut self, wl_surface: WlSurface) {
+        if let Some((mapped, _)) = self.niri.layout.find_window_and_output(&wl_surface) {
+            mapped.toplevel().send_close();
+        }
+    }
+
+    fn set_fullscreen(&mut self, wl_surface: WlSurface, wl_output: Option<WlOutput>) {
+        if let Some((mapped, current_output)) = self.niri.layout.find_window_and_output(&wl_surface)
+        {
+            let has_fullscreen_cap = with_toplevel_role(mapped.toplevel(), |role| {
+                role.current
+                    .capabilities
+                    .contains(xdg_toplevel::WmCapabilities::Fullscreen)
+            });
+            if !has_fullscreen_cap {
+                return;
+            }
+
+            let window = mapped.window.clone();
+
+            if let Some(requested_output) = wl_output.as_ref().and_then(Output::from_resource) {
+                if &requested_output != current_output {
+                    self.niri
+                        .layout
+                        .move_to_output(Some(&window), &requested_output, None);
+                }
+            }
+
+            self.niri.layout.set_fullscreen(&window, true);
+        }
+    }
+
+    fn unset_fullscreen(&mut self, wl_surface: WlSurface) {
+        if let Some((mapped, _)) = self.niri.layout.find_window_and_output(&wl_surface) {
+            let window = mapped.window.clone();
+            self.niri.layout.set_fullscreen(&window, false);
+        }
+    }
+}
+delegate_foreign_toplevel!(State);
+
+impl ScreencopyHandler for State {
+    fn frame(&mut self, manager: &ZwlrScreencopyManagerV1, screencopy: Screencopy) {
+        // If with_damage then push it onto the queue for redraw of the output,
+        // otherwise render it immediately.
+        if screencopy.with_damage() {
+            let Some(queue) = self.niri.screencopy_state.get_queue_mut(manager) else {
+                trace!("screencopy manager destroyed already");
+                return;
+            };
+            queue.push(screencopy);
+        } else {
+            self.backend.with_primary_renderer(|renderer| {
+                if let Err(err) = self
+                    .niri
+                    .render_for_screencopy_without_damage(renderer, manager, screencopy)
+                {
+                    warn!("error rendering for screencopy: {err:?}");
+                }
+            });
+        }
+    }
+
+    fn screencopy_state(&mut self) -> &mut ScreencopyManagerState {
+        &mut self.niri.screencopy_state
+    }
+}
+delegate_screencopy!(State);
+
+impl DrmLeaseHandler for State {
+    fn drm_lease_state(&mut self, node: DrmNode) -> &mut DrmLeaseState {
+        self.backend
+            .tty()
+            .get_device_from_node(node)
+            .unwrap()
+            .drm_lease_state
+            .as_mut()
+            .unwrap()
+    }
+
+    fn lease_request(
+        &mut self,
+        node: DrmNode,
+        request: DrmLeaseRequest,
+    ) -> Result<DrmLeaseBuilder, LeaseRejected> {
+        debug!(
+            "Received lease request for {} connectors",
+            request.connectors.len()
+        );
+        self.backend
+            .tty()
+            .get_device_from_node(node)
+            .unwrap()
+            .lease_request(request)
+    }
+
+    fn new_active_lease(&mut self, node: DrmNode, lease: DrmLease) {
+        debug!("Lease success");
+        self.backend
+            .tty()
+            .get_device_from_node(node)
+            .unwrap()
+            .new_lease(lease);
+    }
+
+    fn lease_destroyed(&mut self, node: DrmNode, lease_id: u32) {
+        debug!("Destroyed lease");
+        self.backend
+            .tty()
+            .get_device_from_node(node)
+            .unwrap()
+            .remove_lease(lease_id);
+    }
+}
+delegate_drm_lease!(State);
+
+delegate_viewporter!(State);
+
+impl GammaControlHandler for State {
+    fn gamma_control_manager_state(&mut self) -> &mut GammaControlManagerState {
+        &mut self.niri.gamma_control_manager_state
+    }
+
+    fn get_gamma_size(&mut self, output: &Output) -> Option<u32> {
+        match self.backend.tty().get_gamma_size(output) {
+            Ok(0) => None, // Setting gamma is not supported.
+            Ok(size) => Some(size),
+            Err(err) => {
+                warn!(
+                    "error getting gamma size for output {}: {err:?}",
+                    output.name()
+                );
+                None
+            }
+        }
+    }
+
+    fn set_gamma(&mut self, output: &Output, ramp: Option<Vec<u16>>) -> Option<()> {
+        match self.backend.tty().set_gamma(output, ramp) {
+            Ok(()) => Some(()),
+            Err(err) => {
+                warn!("error setting gamma for output {}: {err:?}", output.name());
+                None
+            }
+        }
+    }
+}
+delegate_gamma_control!(State);
+
+impl XdgActivationHandler for State {
+    fn activation_state(&mut self) -> &mut XdgActivationState {
+        &mut self.niri.activation_state
+    }
+
+    fn token_created(&mut self, _token: XdgActivationToken, data: XdgActivationTokenData) -> bool {
+        // Only tokens that were created while the application has keyboard focus are valid.
+        let Some((serial, seat)) = data.serial else {
+            return false;
+        };
+        let Some(seat) = Seat::<State>::from_resource(&seat) else {
+            return false;
+        };
+
+        let keyboard = seat.get_keyboard().unwrap();
+        keyboard
+            .last_enter()
+            .map(|last_enter| serial.is_no_older_than(&last_enter))
+            .unwrap_or(false)
+    }
+
+    fn request_activation(
+        &mut self,
+        token: XdgActivationToken,
+        token_data: XdgActivationTokenData,
+        surface: WlSurface,
+    ) {
+        if token_data.timestamp.elapsed() < XDG_ACTIVATION_TOKEN_TIMEOUT {
+            if let Some((mapped, _)) = self.niri.layout.find_window_and_output(&surface) {
+                let window = mapped.window.clone();
+                self.niri.layout.activate_window(&window);
+                self.niri.layer_shell_on_demand_focus = None;
+                self.niri.queue_redraw_all();
+            } else if let Some(unmapped) = self.niri.unmapped_windows.get_mut(&surface) {
+                unmapped.activation_token_data = Some(token_data);
+            }
+        }
+
+        self.niri.activation_state.remove_token(&token);
+    }
+}
+delegate_xdg_activation!(State);
+
+impl FractionalScaleHandler for State {}
+delegate_fractional_scale!(State);
+
+impl OutputManagementHandler for State {
+    fn output_management_state(&mut self) -> &mut OutputManagementManagerState {
+        &mut self.niri.output_management_state
+    }
+
+    fn apply_output_config(&mut self, config: niri_config::Outputs) {
+        self.niri.config.borrow_mut().outputs = config;
+        self.reload_output_config();
+    }
+}
+delegate_output_management!(State);
+
+impl MutterX11InteropHandler for State {}
+delegate_mutter_x11_interop!(State);
+
+delegate_single_pixel_buffer!(State);

src/input/move_grab.rs

@@ -0,0 +1,234 @@
+use std::time::Duration;
+
+use smithay::backend::input::ButtonState;
+use smithay::desktop::Window;
+use smithay::input::pointer::{
+    AxisFrame, ButtonEvent, CursorImageStatus, GestureHoldBeginEvent, GestureHoldEndEvent,
+    GesturePinchBeginEvent, GesturePinchEndEvent, GesturePinchUpdateEvent, GestureSwipeBeginEvent,
+    GestureSwipeEndEvent, GestureSwipeUpdateEvent, GrabStartData as PointerGrabStartData,
+    MotionEvent, PointerGrab, PointerInnerHandle, RelativeMotionEvent,
+};
+use smithay::input::SeatHandler;
+use smithay::utils::{IsAlive, Logical, Point};
+
+use crate::niri::State;
+
+pub struct MoveGrab {
+    start_data: PointerGrabStartData<State>,
+    last_location: Point<f64, Logical>,
+    window: Window,
+    is_moving: bool,
+}
+
+impl MoveGrab {
+    pub fn new(start_data: PointerGrabStartData<State>, window: Window) -> Self {
+        Self {
+            last_location: start_data.location,
+            start_data,
+            window,
+            is_moving: false,
+        }
+    }
+
+    fn on_ungrab(&mut self, state: &mut State) {
+        state.niri.layout.interactive_move_end(&self.window);
+        // FIXME: only redraw the window output.
+        state.niri.queue_redraw_all();
+        state
+            .niri
+            .cursor_manager
+            .set_cursor_image(CursorImageStatus::default_named());
+    }
+}
+
+impl PointerGrab<State> for MoveGrab {
+    fn motion(
+        &mut self,
+        data: &mut State,
+        handle: &mut PointerInnerHandle<'_, State>,
+        _focus: Option<(<State as SeatHandler>::PointerFocus, Point<f64, Logical>)>,
+        event: &MotionEvent,
+    ) {
+        // While the grab is active, no client has pointer focus.
+        handle.motion(data, None, event);
+
+        if self.window.alive() {
+            if let Some((output, pos_within_output)) = data.niri.output_under(event.location) {
+                let output = output.clone();
+                let event_delta = event.location - self.last_location;
+                self.last_location = event.location;
+                let ongoing = data.niri.layout.interactive_move_update(
+                    &self.window,
+                    event_delta,
+                    output,
+                    pos_within_output,
+                );
+                if ongoing {
+                    let timestamp = Duration::from_millis(u64::from(event.time));
+                    if self.is_moving {
+                        data.niri.layout.view_offset_gesture_update(
+                            -event_delta.x,
+                            timestamp,
+                            false,
+                        );
+                    }
+                    // FIXME: only redraw the previous and the new output.
+                    data.niri.queue_redraw_all();
+                    return;
+                }
+            } else {
+                return;
+            }
+        }
+
+        // The move is no longer ongoing.
+        handle.unset_grab(self, data, event.serial, event.time, true);
+    }
+
+    fn relative_motion(
+        &mut self,
+        data: &mut State,
+        handle: &mut PointerInnerHandle<'_, State>,
+        _focus: Option<(<State as SeatHandler>::PointerFocus, Point<f64, Logical>)>,
+        event: &RelativeMotionEvent,
+    ) {
+        // While the grab is active, no client has pointer focus.
+        handle.relative_motion(data, None, event);
+    }
+
+    fn button(
+        &mut self,
+        data: &mut State,
+        handle: &mut PointerInnerHandle<'_, State>,
+        event: &ButtonEvent,
+    ) {
+        handle.button(data, event);
+
+        // MouseButton::Middle
+        if event.button == 0x112 {
+            if event.state == ButtonState::Pressed {
+                let output = data
+                    .niri
+                    .output_under(handle.current_location())
+                    .map(|(output, _)| output)
+                    .cloned();
+                // FIXME: workspace switch gesture.
+                if let Some(output) = output {
+                    self.is_moving = true;
+                    data.niri.layout.view_offset_gesture_begin(&output, false);
+                }
+            } else if event.state == ButtonState::Released {
+                self.is_moving = false;
+                data.niri.layout.view_offset_gesture_end(false, None);
+            }
+        }
+
+        // When moving with the left button, right toggles floating, and vice versa.
+        let toggle_floating_button = if self.start_data.button == 0x110 {
+            0x111
+        } else {
+            0x110
+        };
+        if event.button == toggle_floating_button && event.state == ButtonState::Pressed {
+            data.niri.layout.toggle_window_floating(Some(&self.window));
+        }
+
+        if !handle.current_pressed().contains(&self.start_data.button) {
+            // The button that initiated the grab was released.
+            handle.unset_grab(self, data, event.serial, event.time, true);
+        }
+    }
+
+    fn axis(
+        &mut self,
+        data: &mut State,
+        handle: &mut PointerInnerHandle<'_, State>,
+        details: AxisFrame,
+    ) {
+        handle.axis(data, details);
+    }
+
+    fn frame(&mut self, data: &mut State, handle: &mut PointerInnerHandle<'_, State>) {
+        handle.frame(data);
+    }
+
+    fn gesture_swipe_begin(
+        &mut self,
+        data: &mut State,
+        handle: &mut PointerInnerHandle<'_, State>,
+        event: &GestureSwipeBeginEvent,
+    ) {
+        handle.gesture_swipe_begin(data, event);
+    }
+
+    fn gesture_swipe_update(
+        &mut self,
+        data: &mut State,
+        handle: &mut PointerInnerHandle<'_, State>,
+        event: &GestureSwipeUpdateEvent,
+    ) {
+        handle.gesture_swipe_update(data, event);
+    }
+
+    fn gesture_swipe_end(
+        &mut self,
+        data: &mut State,
+        handle: &mut PointerInnerHandle<'_, State>,
+        event: &GestureSwipeEndEvent,
+    ) {
+        handle.gesture_swipe_end(data, event);
+    }
+
+    fn gesture_pinch_begin(
+        &mut self,
+        data: &mut State,
+        handle: &mut PointerInnerHandle<'_, State>,
+        event: &GesturePinchBeginEvent,
+    ) {
+        handle.gesture_pinch_begin(data, event);
+    }
+
+    fn gesture_pinch_update(
+        &mut self,
+        data: &mut State,
+        handle: &mut PointerInnerHandle<'_, State>,
+        event: &GesturePinchUpdateEvent,
+    ) {
+        handle.gesture_pinch_update(data, event);
+    }
+
+    fn gesture_pinch_end(
+        &mut self,
+        data: &mut State,
+        handle: &mut PointerInnerHandle<'_, State>,
+        event: &GesturePinchEndEvent,
+    ) {
+        handle.gesture_pinch_end(data, event);
+    }
+
+    fn gesture_hold_begin(
+        &mut self,
+        data: &mut State,
+        handle: &mut PointerInnerHandle<'_, State>,
+        event: &GestureHoldBeginEvent,
+    ) {
+        handle.gesture_hold_begin(data, event);
+    }
+
+    fn gesture_hold_end(
+        &mut self,
+        data: &mut State,
+        handle: &mut PointerInnerHandle<'_, State>,
+        event: &GestureHoldEndEvent,
+    ) {
+        handle.gesture_hold_end(data, event);
+    }
+
+    fn start_data(&self) -> &PointerGrabStartData<State> {
+        &self.start_data
+    }
+
+    fn unset(&mut self, data: &mut State) {
+        self.on_ungrab(data);
+    }
+}

src/input/resize_grab.rs

@@ -0,0 +1,175 @@
+use smithay::desktop::Window;
+use smithay::input::pointer::{
+    AxisFrame, ButtonEvent, CursorImageStatus, GestureHoldBeginEvent, GestureHoldEndEvent,
+    GesturePinchBeginEvent, GesturePinchEndEvent, GesturePinchUpdateEvent, GestureSwipeBeginEvent,
+    GestureSwipeEndEvent, GestureSwipeUpdateEvent, GrabStartData as PointerGrabStartData,
+    MotionEvent, PointerGrab, PointerInnerHandle, RelativeMotionEvent,
+};
+use smithay::input::SeatHandler;
+use smithay::utils::{IsAlive, Logical, Point};
+
+use crate::niri::State;
+
+pub struct ResizeGrab {
+    start_data: PointerGrabStartData<State>,
+    window: Window,
+}
+
+impl ResizeGrab {
+    pub fn new(start_data: PointerGrabStartData<State>, window: Window) -> Self {
+        Self { start_data, window }
+    }
+
+    fn on_ungrab(&mut self, state: &mut State) {
+        state.niri.layout.interactive_resize_end(&self.window);
+        state
+            .niri
+            .cursor_manager
+            .set_cursor_image(CursorImageStatus::default_named());
+    }
+}
+
+impl PointerGrab<State> for ResizeGrab {
+    fn motion(
+        &mut self,
+        data: &mut State,
+        handle: &mut PointerInnerHandle<'_, State>,
+        _focus: Option<(<State as SeatHandler>::PointerFocus, Point<f64, Logical>)>,
+        event: &MotionEvent,
+    ) {
+        // While the grab is active, no client has pointer focus.
+        handle.motion(data, None, event);
+
+        if self.window.alive() {
+            let delta = event.location - self.start_data.location;
+            let ongoing = data
+                .niri
+                .layout
+                .interactive_resize_update(&self.window, delta);
+            if ongoing {
+                return;
+            }
+        }
+
+        // The resize is no longer ongoing.
+        handle.unset_grab(self, data, event.serial, event.time, true);
+    }
+
+    fn relative_motion(
+        &mut self,
+        data: &mut State,
+        handle: &mut PointerInnerHandle<'_, State>,
+        _focus: Option<(<State as SeatHandler>::PointerFocus, Point<f64, Logical>)>,
+        event: &RelativeMotionEvent,
+    ) {
+        // While the grab is active, no client has pointer focus.
+        handle.relative_motion(data, None, event);
+    }
+
+    fn button(
+        &mut self,
+        data: &mut State,
+        handle: &mut PointerInnerHandle<'_, State>,
+        event: &ButtonEvent,
+    ) {
+        handle.button(data, event);
+
+        if handle.current_pressed().is_empty() {
+            // No more buttons are pressed, release the grab.
+            handle.unset_grab(self, data, event.serial, event.time, true);
+        }
+    }
+
+    fn axis(
+        &mut self,
+        data: &mut State,
+        handle: &mut PointerInnerHandle<'_, State>,
+        details: AxisFrame,
+    ) {
+        handle.axis(data, details);
+    }
+
+    fn frame(&mut self, data: &mut State, handle: &mut PointerInnerHandle<'_, State>) {
+        handle.frame(data);
+    }
+
+    fn gesture_swipe_begin(
+        &mut self,
+        data: &mut State,
+        handle: &mut PointerInnerHandle<'_, State>,
+        event: &GestureSwipeBeginEvent,
+    ) {
+        handle.gesture_swipe_begin(data, event);
+    }
+
+    fn gesture_swipe_update(
+        &mut self,
+        data: &mut State,
+        handle: &mut PointerInnerHandle<'_, State>,
+        event: &GestureSwipeUpdateEvent,
+    ) {
+        handle.gesture_swipe_update(data, event);
+    }
+
+    fn gesture_swipe_end(
+        &mut self,
+        data: &mut State,
+        handle: &mut PointerInnerHandle<'_, State>,
+        event: &GestureSwipeEndEvent,
+    ) {
+        handle.gesture_swipe_end(data, event);
+    }
+
+    fn gesture_pinch_begin(
+        &mut self,
+        data: &mut State,
+        handle: &mut PointerInnerHandle<'_, State>,
+        event: &GesturePinchBeginEvent,
+    ) {
+        handle.gesture_pinch_begin(data, event);
+    }
+
+    fn gesture_pinch_update(
+        &mut self,
+        data: &mut State,
+        handle: &mut PointerInnerHandle<'_, State>,
+        event: &GesturePinchUpdateEvent,
+    ) {
+        handle.gesture_pinch_update(data, event);
+    }
+
+    fn gesture_pinch_end(
+        &mut self,
+        data: &mut State,
+        handle: &mut PointerInnerHandle<'_, State>,
+        event: &GesturePinchEndEvent,
+    ) {
+        handle.gesture_pinch_end(data, event);
+    }
+
+    fn gesture_hold_begin(
+        &mut self,
+        data: &mut State,
+        handle: &mut PointerInnerHandle<'_, State>,
+        event: &GestureHoldBeginEvent,
+    ) {
+        handle.gesture_hold_begin(data, event);
+    }
+
+    fn gesture_hold_end(
+        &mut self,
+        data: &mut State,
+        handle: &mut PointerInnerHandle<'_, State>,
+        event: &GestureHoldEndEvent,
+    ) {
+        handle.gesture_hold_end(data, event);
+    }
+
+    fn start_data(&self) -> &PointerGrabStartData<State> {
+        &self.start_data
+    }
+
+    fn unset(&mut self, data: &mut State) {
+        self.on_ungrab(data);
+    }
+}

src/input/scroll_tracker.rs

@@ -0,0 +1,40 @@
+pub struct ScrollTracker {
+    tick: f64,
+    last: f64,
+    acc: f64,
+}
+
+impl ScrollTracker {
+    #[allow(clippy::new_without_default)]
+    pub fn new(tick: i8) -> Self {
+        Self {
+            tick: f64::from(tick),
+            last: 0.,
+            acc: 0.,
+        }
+    }
+
+    pub fn accumulate(&mut self, amount: f64) -> i8 {
+        let changed_direction = (self.last > 0. && amount < 0.) || (self.last < 0. && amount > 0.);
+        if changed_direction {
+            self.acc = 0.
+        }
+
+        self.last = amount;
+        self.acc += amount;
+
+        let mut ticks = 0;
+        if self.acc.abs() >= self.tick {
+            let clamped = self.acc.clamp(-127. * self.tick, 127. * self.tick);
+            ticks = (clamped as i16 / self.tick as i16) as i8;
+            self.acc %= self.tick;
+        }
+
+        ticks
+    }
+
+    pub fn reset(&mut self) {
+        self.last = 0.;
+        self.acc = 0.;
+    }
+}

src/input/spatial_movement_grab.rs

@@ -0,0 +1,230 @@
+use std::time::Duration;
+
+use smithay::input::pointer::{
+    AxisFrame, ButtonEvent, CursorImageStatus, GestureHoldBeginEvent, GestureHoldEndEvent,
+    GesturePinchBeginEvent, GesturePinchEndEvent, GesturePinchUpdateEvent, GestureSwipeBeginEvent,
+    GestureSwipeEndEvent, GestureSwipeUpdateEvent, GrabStartData as PointerGrabStartData,
+    MotionEvent, PointerGrab, PointerInnerHandle, RelativeMotionEvent,
+};
+use smithay::input::SeatHandler;
+use smithay::output::Output;
+use smithay::utils::{Logical, Point};
+
+use crate::niri::State;
+
+pub struct SpatialMovementGrab {
+    start_data: PointerGrabStartData<State>,
+    last_location: Point<f64, Logical>,
+    output: Output,
+    gesture: GestureState,
+}
+
+#[derive(Debug, Clone, Copy)]
+enum GestureState {
+    Recognizing,
+    ViewOffset,
+    WorkspaceSwitch,
+}
+
+impl SpatialMovementGrab {
+    pub fn new(start_data: PointerGrabStartData<State>, output: Output) -> Self {
+        Self {
+            last_location: start_data.location,
+            start_data,
+            output,
+            gesture: GestureState::Recognizing,
+        }
+    }
+
+    fn on_ungrab(&mut self, state: &mut State) {
+        let layout = &mut state.niri.layout;
+        let res = match self.gesture {
+            GestureState::Recognizing => None,
+            GestureState::ViewOffset => layout.view_offset_gesture_end(false, Some(false)),
+            GestureState::WorkspaceSwitch => {
+                layout.workspace_switch_gesture_end(false, Some(false))
+            }
+        };
+
+        if let Some(output) = res {
+            state.niri.queue_redraw(&output);
+        }
+
+        state
+            .niri
+            .cursor_manager
+            .set_cursor_image(CursorImageStatus::default_named());
+    }
+}
+
+impl PointerGrab<State> for SpatialMovementGrab {
+    fn motion(
+        &mut self,
+        data: &mut State,
+        handle: &mut PointerInnerHandle<'_, State>,
+        _focus: Option<(<State as SeatHandler>::PointerFocus, Point<f64, Logical>)>,
+        event: &MotionEvent,
+    ) {
+        // While the grab is active, no client has pointer focus.
+        handle.motion(data, None, event);
+
+        let timestamp = Duration::from_millis(u64::from(event.time));
+        let delta = event.location - self.last_location;
+        self.last_location = event.location;
+
+        let layout = &mut data.niri.layout;
+        let res = match self.gesture {
+            GestureState::Recognizing => {
+                let c = event.location - self.start_data.location;
+
+                // Check if the gesture moved far enough to decide. Threshold copied from GTK 4.
+                if c.x * c.x + c.y * c.y >= 8. * 8. {
+                    if c.x.abs() > c.y.abs() {
+                        self.gesture = GestureState::ViewOffset;
+                        layout.view_offset_gesture_begin(&self.output, false);
+                        layout.view_offset_gesture_update(-c.x, timestamp, false)
+                    } else {
+                        self.gesture = GestureState::WorkspaceSwitch;
+                        layout.workspace_switch_gesture_begin(&self.output, false);
+                        layout.workspace_switch_gesture_update(-c.y, timestamp, false)
+                    }
+                } else {
+                    Some(None)
+                }
+            }
+            GestureState::ViewOffset => {
+                layout.view_offset_gesture_update(-delta.x, timestamp, false)
+            }
+            GestureState::WorkspaceSwitch => {
+                layout.workspace_switch_gesture_update(-delta.y, timestamp, false)
+            }
+        };
+
+        if let Some(output) = res {
+            if let Some(output) = output {
+                data.niri.queue_redraw(&output);
+            }
+        } else {
+            // The resize is no longer ongoing.
+            handle.unset_grab(self, data, event.serial, event.time, true);
+        }
+    }
+
+    fn relative_motion(
+        &mut self,
+        data: &mut State,
+        handle: &mut PointerInnerHandle<'_, State>,
+        _focus: Option<(<State as SeatHandler>::PointerFocus, Point<f64, Logical>)>,
+        event: &RelativeMotionEvent,
+    ) {
+        // While the grab is active, no client has pointer focus.
+        handle.relative_motion(data, None, event);
+    }
+
+    fn button(
+        &mut self,
+        data: &mut State,
+        handle: &mut PointerInnerHandle<'_, State>,
+        event: &ButtonEvent,
+    ) {
+        handle.button(data, event);
+
+        if handle.current_pressed().is_empty() {
+            // No more buttons are pressed, release the grab.
+            handle.unset_grab(self, data, event.serial, event.time, true);
+        }
+    }
+
+    fn axis(
+        &mut self,
+        data: &mut State,
+        handle: &mut PointerInnerHandle<'_, State>,
+        details: AxisFrame,
+    ) {
+        handle.axis(data, details);
+    }
+
+    fn frame(&mut self, data: &mut State, handle: &mut PointerInnerHandle<'_, State>) {
+        handle.frame(data);
+    }
+
+    fn gesture_swipe_begin(
+        &mut self,
+        data: &mut State,
+        handle: &mut PointerInnerHandle<'_, State>,
+        event: &GestureSwipeBeginEvent,
+    ) {
+        handle.gesture_swipe_begin(data, event);
+    }
+
+    fn gesture_swipe_update(
+        &mut self,
+        data: &mut State,
+        handle: &mut PointerInnerHandle<'_, State>,
+        event: &GestureSwipeUpdateEvent,
+    ) {
+        handle.gesture_swipe_update(data, event);
+    }
+
+    fn gesture_swipe_end(
+        &mut self,
+        data: &mut State,
+        handle: &mut PointerInnerHandle<'_, State>,
+        event: &GestureSwipeEndEvent,
+    ) {
+        handle.gesture_swipe_end(data, event);
+    }
+
+    fn gesture_pinch_begin(
+        &mut self,
+        data: &mut State,
+        handle: &mut PointerInnerHandle<'_, State>,
+        event: &GesturePinchBeginEvent,
+    ) {
+        handle.gesture_pinch_begin(data, event);
+    }
+
+    fn gesture_pinch_update(
+        &mut self,
+        data: &mut State,
+        handle: &mut PointerInnerHandle<'_, State>,
+        event: &GesturePinchUpdateEvent,
+    ) {
+        handle.gesture_pinch_update(data, event);
+    }
+
+    fn gesture_pinch_end(
+        &mut self,
+        data: &mut State,
+        handle: &mut PointerInnerHandle<'_, State>,
+        event: &GesturePinchEndEvent,
+    ) {
+        handle.gesture_pinch_end(data, event);
+    }
+
+    fn gesture_hold_begin(
+        &mut self,
+        data: &mut State,
+        handle: &mut PointerInnerHandle<'_, State>,
+        event: &GestureHoldBeginEvent,
+    ) {
+        handle.gesture_hold_begin(data, event);
+    }
+
+    fn gesture_hold_end(
+        &mut self,
+        data: &mut State,
+        handle: &mut PointerInnerHandle<'_, State>,
+        event: &GestureHoldEndEvent,
+    ) {
+        handle.gesture_hold_end(data, event);
+    }
+
+    fn start_data(&self) -> &PointerGrabStartData<State> {
+        &self.start_data
+    }
+
+    fn unset(&mut self, data: &mut State) {
+        self.on_ungrab(data);
+    }
+}

src/input/swipe_tracker.rs

@@ -0,0 +1,87 @@
+use std::collections::VecDeque;
+use std::time::Duration;
+
+const HISTORY_LIMIT: Duration = Duration::from_millis(150);
+const DECELERATION_TOUCHPAD: f64 = 0.997;
+
+#[derive(Debug)]
+pub struct SwipeTracker {
+    history: VecDeque<Event>,
+    pos: f64,
+}
+
+#[derive(Debug, Clone, Copy)]
+struct Event {
+    delta: f64,
+    timestamp: Duration,
+}
+
+impl SwipeTracker {
+    #[allow(clippy::new_without_default)]
+    pub fn new() -> Self {
+        Self {
+            history: VecDeque::new(),
+            pos: 0.,
+        }
+    }
+
+    /// Pushes a new reading into the tracker.
+    pub fn push(&mut self, delta: f64, timestamp: Duration) {
+        // For the events that we care about, timestamps should always increase
+        // monotonically.
+        if let Some(last) = self.history.back() {
+            if timestamp < last.timestamp {
+                trace!(
+                    "ignoring event with timestamp {timestamp:?} earlier than last {:?}",
+                    last.timestamp
+                );
+                return;
+            }
+        }
+
+        self.history.push_back(Event { delta, timestamp });
+        self.pos += delta;
+
+        self.trim_history();
+    }
+
+    /// Returns the current gesture position.
+    pub fn pos(&self) -> f64 {
+        self.pos
+    }
+
+    /// Computes the current gesture velocity.
+    pub fn velocity(&self) -> f64 {
+        let (Some(first), Some(last)) = (self.history.front(), self.history.back()) else {
+            return 0.;
+        };
+
+        let total_time = (last.timestamp - first.timestamp).as_secs_f64();
+        if total_time == 0. {
+            return 0.;
+        }
+
+        let total_delta = self.history.iter().map(|event| event.delta).sum::<f64>();
+        total_delta / total_time
+    }
+
+    /// Computes the gesture end position after decelerating to a halt.
+    pub fn projected_end_pos(&self) -> f64 {
+        let vel = self.velocity();
+        self.pos - vel / (1000. * DECELERATION_TOUCHPAD.ln())
+    }
+
+    fn trim_history(&mut self) {
+        let Some(&Event { timestamp, .. }) = self.history.back() else {
+            return;
+        };
+
+        while let Some(first) = self.history.front() {
+            if timestamp <= first.timestamp + HISTORY_LIMIT {
+                break;
+            }
+
+            let _ = self.history.pop_front();
+        }
+    }
+}

src/input/touch_move_grab.rs

@@ -0,0 +1,136 @@
+use smithay::desktop::Window;
+use smithay::input::touch::{
+    DownEvent, GrabStartData as TouchGrabStartData, MotionEvent, OrientationEvent, ShapeEvent,
+    TouchGrab, TouchInnerHandle, UpEvent,
+};
+use smithay::input::SeatHandler;
+use smithay::utils::{IsAlive, Logical, Point, Serial};
+
+use crate::niri::State;
+
+pub struct TouchMoveGrab {
+    start_data: TouchGrabStartData<State>,
+    last_location: Point<f64, Logical>,
+    window: Window,
+}
+
+impl TouchMoveGrab {
+    pub fn new(start_data: TouchGrabStartData<State>, window: Window) -> Self {
+        Self {
+            last_location: start_data.location,
+            start_data,
+            window,
+        }
+    }
+
+    fn on_ungrab(&mut self, state: &mut State) {
+        state.niri.layout.interactive_move_end(&self.window);
+        // FIXME: only redraw the window output.
+        state.niri.queue_redraw_all();
+    }
+}
+
+impl TouchGrab<State> for TouchMoveGrab {
+    fn down(
+        &mut self,
+        data: &mut State,
+        handle: &mut TouchInnerHandle<'_, State>,
+        _focus: Option<(<State as SeatHandler>::TouchFocus, Point<f64, Logical>)>,
+        event: &DownEvent,
+        seq: Serial,
+    ) {
+        handle.down(data, None, event, seq);
+    }
+
+    fn up(
+        &mut self,
+        data: &mut State,
+        handle: &mut TouchInnerHandle<'_, State>,
+        event: &UpEvent,
+        seq: Serial,
+    ) {
+        handle.up(data, event, seq);
+
+        if event.slot != self.start_data.slot {
+            return;
+        }
+
+        handle.unset_grab(self, data);
+    }
+
+    fn motion(
+        &mut self,
+        data: &mut State,
+        handle: &mut TouchInnerHandle<'_, State>,
+        _focus: Option<(<State as SeatHandler>::TouchFocus, Point<f64, Logical>)>,
+        event: &MotionEvent,
+        seq: Serial,
+    ) {
+        handle.motion(data, None, event, seq);
+
+        if event.slot != self.start_data.slot {
+            return;
+        }
+
+        if self.window.alive() {
+            if let Some((output, pos_within_output)) = data.niri.output_under(event.location) {
+                let output = output.clone();
+                let event_delta = event.location - self.last_location;
+                self.last_location = event.location;
+                let ongoing = data.niri.layout.interactive_move_update(
+                    &self.window,
+                    event_delta,
+                    output,
+                    pos_within_output,
+                );
+                if ongoing {
+                    // FIXME: only redraw the previous and the new output.
+                    data.niri.queue_redraw_all();
+                    return;
+                }
+            } else {
+                return;
+            }
+        }
+
+        // The move is no longer ongoing.
+        handle.unset_grab(self, data);
+    }
+
+    fn frame(&mut self, data: &mut State, handle: &mut TouchInnerHandle<'_, State>, seq: Serial) {
+        handle.frame(data, seq);
+    }
+
+    fn cancel(&mut self, data: &mut State, handle: &mut TouchInnerHandle<'_, State>, seq: Serial) {
+        handle.cancel(data, seq);
+        handle.unset_grab(self, data);
+    }
+
+    fn shape(
+        &mut self,
+        data: &mut State,
+        handle: &mut TouchInnerHandle<'_, State>,
+        event: &ShapeEvent,
+        seq: Serial,
+    ) {
+        handle.shape(data, event, seq);
+    }
+
+    fn orientation(
+        &mut self,
+        data: &mut State,
+        handle: &mut TouchInnerHandle<'_, State>,
+        event: &OrientationEvent,
+        seq: Serial,
+    ) {
+        handle.orientation(data, event, seq);
+    }
+
+    fn start_data(&self) -> &TouchGrabStartData<State> {
+        &self.start_data
+    }
+
+    fn unset(&mut self, data: &mut State) {
+        self.on_ungrab(data);
+    }
+}

src/input/touch_resize_grab.rs

@@ -0,0 +1,119 @@
+use smithay::desktop::Window;
+use smithay::input::touch::{
+    DownEvent, GrabStartData as TouchGrabStartData, MotionEvent, OrientationEvent, ShapeEvent,
+    TouchGrab, TouchInnerHandle, UpEvent,
+};
+use smithay::input::SeatHandler;
+use smithay::utils::{IsAlive, Logical, Point, Serial};
+
+use crate::niri::State;
+
+pub struct TouchResizeGrab {
+    start_data: TouchGrabStartData<State>,
+    window: Window,
+}
+
+impl TouchResizeGrab {
+    pub fn new(start_data: TouchGrabStartData<State>, window: Window) -> Self {
+        Self { start_data, window }
+    }
+
+    fn on_ungrab(&mut self, state: &mut State) {
+        state.niri.layout.interactive_resize_end(&self.window);
+    }
+}
+
+impl TouchGrab<State> for TouchResizeGrab {
+    fn down(
+        &mut self,
+        data: &mut State,
+        handle: &mut TouchInnerHandle<'_, State>,
+        _focus: Option<(<State as SeatHandler>::TouchFocus, Point<f64, Logical>)>,
+        event: &DownEvent,
+        seq: Serial,
+    ) {
+        handle.down(data, None, event, seq);
+    }
+
+    fn up(
+        &mut self,
+        data: &mut State,
+        handle: &mut TouchInnerHandle<'_, State>,
+        event: &UpEvent,
+        seq: Serial,
+    ) {
+        handle.up(data, event, seq);
+
+        if event.slot != self.start_data.slot {
+            return;
+        }
+
+        handle.unset_grab(self, data);
+    }
+
+    fn motion(
+        &mut self,
+        data: &mut State,
+        handle: &mut TouchInnerHandle<'_, State>,
+        _focus: Option<(<State as SeatHandler>::TouchFocus, Point<f64, Logical>)>,
+        event: &MotionEvent,
+        seq: Serial,
+    ) {
+        handle.motion(data, None, event, seq);
+
+        if event.slot != self.start_data.slot {
+            return;
+        }
+
+        if self.window.alive() {
+            let delta = event.location - self.start_data.location;
+            let ongoing = data
+                .niri
+                .layout
+                .interactive_resize_update(&self.window, delta);
+            if ongoing {
+                return;
+            }
+        }
+
+        // The resize is no longer ongoing.
+        handle.unset_grab(self, data);
+    }
+
+    fn frame(&mut self, data: &mut State, handle: &mut TouchInnerHandle<'_, State>, seq: Serial) {
+        handle.frame(data, seq);
+    }
+
+    fn cancel(&mut self, data: &mut State, handle: &mut TouchInnerHandle<'_, State>, seq: Serial) {
+        handle.cancel(data, seq);
+        handle.unset_grab(self, data);
+    }
+
+    fn shape(
+        &mut self,
+        data: &mut State,
+        handle: &mut TouchInnerHandle<'_, State>,
+        event: &ShapeEvent,
+        seq: Serial,
+    ) {
+        handle.shape(data, event, seq);
+    }
+
+    fn orientation(
+        &mut self,
+        data: &mut State,
+        handle: &mut TouchInnerHandle<'_, State>,
+        event: &OrientationEvent,
+        seq: Serial,
+    ) {
+        handle.orientation(data, event, seq);
+    }
+
+    fn start_data(&self) -> &TouchGrabStartData<State> {
+        &self.start_data
+    }
+
+    fn unset(&mut self, data: &mut State) {
+        self.on_ungrab(data);
+    }
+}

src/ipc/client.rs

@@ -0,0 +1,535 @@
+use std::iter::Peekable;
+use std::slice;
+
+use anyhow::{anyhow, bail, Context};
+use niri_config::OutputName;
+use niri_ipc::socket::Socket;
+use niri_ipc::{
+    Event, KeyboardLayouts, LogicalOutput, Mode, Output, OutputConfigChanged, Request, Response,
+    Transform, Window,
+};
+use serde_json::json;
+
+use crate::cli::Msg;
+use crate::utils::version;
+
+pub fn handle_msg(msg: Msg, json: bool) -> anyhow::Result<()> {
+    let request = match &msg {
+        Msg::Version => Request::Version,
+        Msg::Outputs => Request::Outputs,
+        Msg::FocusedWindow => Request::FocusedWindow,
+        Msg::FocusedOutput => Request::FocusedOutput,
+        Msg::Action { action } => Request::Action(action.clone()),
+        Msg::Output { output, action } => Request::Output {
+            output: output.clone(),
+            action: action.clone(),
+        },
+        Msg::Workspaces => Request::Workspaces,
+        Msg::Windows => Request::Windows,
+        Msg::Layers => Request::Layers,
+        Msg::KeyboardLayouts => Request::KeyboardLayouts,
+        Msg::EventStream => Request::EventStream,
+        Msg::RequestError => Request::ReturnError,
+    };
+
+    let socket = Socket::connect().context("error connecting to the niri socket")?;
+
+    let (reply, mut read_event) = socket
+        .send(request)
+        .context("error communicating with niri")?;
+
+    let compositor_version = match reply {
+        Err(_) if !matches!(msg, Msg::Version) => {
+            // If we got an error, it might be that the CLI is a different version from the running
+            // niri instance. Request the running instance version to compare and print a message.
+            Socket::connect()
+                .and_then(|socket| socket.send(Request::Version))
+                .ok()
+                .map(|(reply, _read_event)| reply)
+        }
+        _ => None,
+    };
+
+    // Default SIGPIPE so that our prints don't panic on stdout closing.
+    unsafe {
+        libc::signal(libc::SIGPIPE, libc::SIG_DFL);
+    }
+
+    let response = reply.map_err(|err_msg| {
+        // Check for CLI-server version mismatch to add helpful context.
+        match compositor_version {
+            Some(Ok(Response::Version(compositor_version))) => {
+                let cli_version = version();
+                if cli_version != compositor_version {
+                    eprintln!("Running niri compositor has a different version from the niri CLI:");
+                    eprintln!("Compositor version: {compositor_version}");
+                    eprintln!("CLI version:        {cli_version}");
+                    eprintln!("Did you forget to restart niri after an update?");
+                    eprintln!();
+                }
+            }
+            Some(_) => {
+                eprintln!("Unable to get the running niri compositor version.");
+                eprintln!("Did you forget to restart niri after an update?");
+                eprintln!();
+            }
+            None => {
+                // Communication error, or the original request was already a version request.
+                // Don't add irrelevant context.
+            }
+        }
+
+        anyhow!(err_msg).context("niri returned an error")
+    })?;
+
+    match msg {
+        Msg::RequestError => {
+            bail!("unexpected response: expected an error, got {response:?}");
+        }
+        Msg::Version => {
+            let Response::Version(compositor_version) = response else {
+                bail!("unexpected response: expected Version, got {response:?}");
+            };
+
+            let cli_version = version();
+
+            if json {
+                println!(
+                    "{}",
+                    json!({
+                        "compositor": compositor_version,
+                        "cli": cli_version,
+                    })
+                );
+                return Ok(());
+            }
+
+            if cli_version != compositor_version {
+                eprintln!("Running niri compositor has a different version from the niri CLI.");
+                eprintln!("Did you forget to restart niri after an update?");
+                eprintln!();
+            }
+
+            println!("Compositor version: {compositor_version}");
+            println!("CLI version:        {cli_version}");
+        }
+        Msg::Outputs => {
+            let Response::Outputs(outputs) = response else {
+                bail!("unexpected response: expected Outputs, got {response:?}");
+            };
+
+            if json {
+                let output =
+                    serde_json::to_string(&outputs).context("error formatting response")?;
+                println!("{output}");
+                return Ok(());
+            }
+
+            let mut outputs = outputs
+                .into_values()
+                .map(|out| (OutputName::from_ipc_output(&out), out))
+                .collect::<Vec<_>>();
+            outputs.sort_unstable_by(|a, b| a.0.compare(&b.0));
+
+            for (_name, output) in outputs.into_iter() {
+                print_output(output)?;
+                println!();
+            }
+        }
+        Msg::FocusedWindow => {
+            let Response::FocusedWindow(window) = response else {
+                bail!("unexpected response: expected FocusedWindow, got {response:?}");
+            };
+
+            if json {
+                let window = serde_json::to_string(&window).context("error formatting response")?;
+                println!("{window}");
+                return Ok(());
+            }
+
+            if let Some(window) = window {
+                print_window(&window);
+            } else {
+                println!("No window is focused.");
+            }
+        }
+        Msg::Windows => {
+            let Response::Windows(mut windows) = response else {
+                bail!("unexpected response: expected Windows, got {response:?}");
+            };
+
+            if json {
+                let windows =
+                    serde_json::to_string(&windows).context("error formatting response")?;
+                println!("{windows}");
+                return Ok(());
+            }
+
+            windows.sort_unstable_by(|a, b| a.id.cmp(&b.id));
+
+            for window in windows {
+                print_window(&window);
+                println!();
+            }
+        }
+        Msg::Layers => {
+            let Response::Layers(mut layers) = response else {
+                bail!("unexpected response: expected Layers, got {response:?}");
+            };
+
+            if json {
+                let layers = serde_json::to_string(&layers).context("error formatting response")?;
+                println!("{layers}");
+                return Ok(());
+            }
+
+            layers.sort_by(|a, b| {
+                Ord::cmp(&a.output, &b.output)
+                    .then_with(|| Ord::cmp(&a.layer, &b.layer))
+                    .then_with(|| Ord::cmp(&a.namespace, &b.namespace))
+            });
+            let mut iter = layers.iter().peekable();
+
+            let print = |surface: &niri_ipc::LayerSurface| {
+                println!("    Surface:");
+                println!("      Namespace: \"{}\"", &surface.namespace);
+
+                let interactivity = match surface.keyboard_interactivity {
+                    niri_ipc::LayerSurfaceKeyboardInteractivity::None => "none",
+                    niri_ipc::LayerSurfaceKeyboardInteractivity::Exclusive => "exclusive",
+                    niri_ipc::LayerSurfaceKeyboardInteractivity::OnDemand => "on-demand",
+                };
+                println!("      Keyboard interactivity: {interactivity}");
+            };
+
+            let print_layer = |iter: &mut Peekable<slice::Iter<niri_ipc::LayerSurface>>,
+                               output: &str,
+                               layer| {
+                let mut empty = true;
+                while let Some(surface) = iter.next_if(|s| s.output == output && s.layer == layer) {
+                    empty = false;
+                    println!();
+                    print(surface);
+                }
+                if empty {
+                    println!(" (empty)\n");
+                } else {
+                    println!();
+                }
+            };
+
+            while let Some(surface) = iter.peek() {
+                let output = &surface.output;
+                println!("Output \"{output}\":");
+
+                print!("  Background layer:");
+                print_layer(&mut iter, output, niri_ipc::Layer::Background);
+
+                print!("  Bottom layer:");
+                print_layer(&mut iter, output, niri_ipc::Layer::Bottom);
+
+                print!("  Top layer:");
+                print_layer(&mut iter, output, niri_ipc::Layer::Top);
+
+                print!("  Overlay layer:");
+                print_layer(&mut iter, output, niri_ipc::Layer::Overlay);
+            }
+        }
+        Msg::FocusedOutput => {
+            let Response::FocusedOutput(output) = response else {
+                bail!("unexpected response: expected FocusedOutput, got {response:?}");
+            };
+
+            if json {
+                let output = serde_json::to_string(&output).context("error formatting response")?;
+                println!("{output}");
+                return Ok(());
+            }
+
+            if let Some(output) = output {
+                print_output(output)?;
+            } else {
+                println!("No output is focused.");
+            }
+        }
+        Msg::Action { .. } => {
+            let Response::Handled = response else {
+                bail!("unexpected response: expected Handled, got {response:?}");
+            };
+        }
+        Msg::Output { output, .. } => {
+            let Response::OutputConfigChanged(response) = response else {
+                bail!("unexpected response: expected OutputConfigChanged, got {response:?}");
+            };
+
+            if json {
+                let response =
+                    serde_json::to_string(&response).context("error formatting response")?;
+                println!("{response}");
+                return Ok(());
+            }
+
+            if response == OutputConfigChanged::OutputWasMissing {
+                println!("Output \"{output}\" is not connected.");
+                println!("The change will apply when it is connected.");
+            }
+        }
+        Msg::Workspaces => {
+            let Response::Workspaces(mut response) = response else {
+                bail!("unexpected response: expected Workspaces, got {response:?}");
+            };
+
+            if json {
+                let response =
+                    serde_json::to_string(&response).context("error formatting response")?;
+                println!("{response}");
+                return Ok(());
+            }
+
+            if response.is_empty() {
+                println!("No workspaces.");
+                return Ok(());
+            }
+
+            response.sort_by_key(|ws| ws.idx);
+            response.sort_by(|a, b| a.output.cmp(&b.output));
+
+            let mut current_output = if let Some(output) = response[0].output.as_deref() {
+                println!("Output \"{output}\":");
+                Some(output)
+            } else {
+                println!("No output:");
+                None
+            };
+
+            for ws in &response {
+                if ws.output.as_deref() != current_output {
+                    let output = ws.output.as_deref().context(
+                        "invalid response: workspace with no output \
+                         following a workspace with an output",
+                    )?;
+                    current_output = Some(output);
+                    println!("\nOutput \"{output}\":");
+                }
+
+                let is_active = if ws.is_active { " * " } else { "   " };
+                let idx = ws.idx;
+                let name = if let Some(name) = ws.name.as_deref() {
+                    format!(" \"{name}\"")
+                } else {
+                    String::new()
+                };
+                println!("{is_active}{idx}{name}");
+            }
+        }
+        Msg::KeyboardLayouts => {
+            let Response::KeyboardLayouts(response) = response else {
+                bail!("unexpected response: expected KeyboardLayouts, got {response:?}");
+            };
+
+            if json {
+                let response =
+                    serde_json::to_string(&response).context("error formatting response")?;
+                println!("{response}");
+                return Ok(());
+            }
+
+            let KeyboardLayouts { names, current_idx } = response;
+            let current_idx = usize::from(current_idx);
+
+            println!("Keyboard layouts:");
+            for (idx, name) in names.iter().enumerate() {
+                let is_active = if idx == current_idx { " * " } else { "   " };
+                println!("{is_active}{idx} {name}");
+            }
+        }
+        Msg::EventStream => {
+            let Response::Handled = response else {
+                bail!("unexpected response: expected Handled, got {response:?}");
+            };
+
+            if !json {
+                println!("Started reading events.");
+            }
+
+            loop {
+                let event = read_event().context("error reading event from niri")?;
+
+                if json {
+                    let event = serde_json::to_string(&event).context("error formatting event")?;
+                    println!("{event}");
+                    continue;
+                }
+
+                match event {
+                    Event::WorkspacesChanged { workspaces } => {
+                        println!("Workspaces changed: {workspaces:?}");
+                    }
+                    Event::WorkspaceActivated { id, focused } => {
+                        let word = if focused { "focused" } else { "activated" };
+                        println!("Workspace {word}: {id}");
+                    }
+                    Event::WorkspaceActiveWindowChanged {
+                        workspace_id,
+                        active_window_id,
+                    } => {
+                        println!(
+                            "Workspace {workspace_id}: \
+                             active window changed to {active_window_id:?}"
+                        );
+                    }
+                    Event::WindowsChanged { windows } => {
+                        println!("Windows changed: {windows:?}");
+                    }
+                    Event::WindowOpenedOrChanged { window } => {
+                        println!("Window opened or changed: {window:?}");
+                    }
+                    Event::WindowClosed { id } => {
+                        println!("Window closed: {id}");
+                    }
+                    Event::WindowFocusChanged { id } => {
+                        println!("Window focus changed: {id:?}");
+                    }
+                    Event::KeyboardLayoutsChanged { keyboard_layouts } => {
+                        println!("Keyboard layouts changed: {keyboard_layouts:?}");
+                    }
+                    Event::KeyboardLayoutSwitched { idx } => {
+                        println!("Keyboard layout switched: {idx}");
+                    }
+                }
+            }
+        }
+    }
+
+    Ok(())
+}
+
+fn print_output(output: Output) -> anyhow::Result<()> {
+    let Output {
+        name,
+        make,
+        model,
+        serial,
+        physical_size,
+        modes,
+        current_mode,
+        vrr_supported,
+        vrr_enabled,
+        logical,
+    } = output;
+
+    let serial = serial.as_deref().unwrap_or("Unknown");
+    println!(r#"Output "{make} {model} {serial}" ({name})"#);
+
+    if let Some(current) = current_mode {
+        let mode = *modes
+            .get(current)
+            .context("invalid response: current mode does not exist")?;
+        let Mode {
+            width,
+            height,
+            refresh_rate,
+            is_preferred,
+        } = mode;
+        let refresh = refresh_rate as f64 / 1000.;
+        let preferred = if is_preferred { " (preferred)" } else { "" };
+        println!("  Current mode: {width}x{height} @ {refresh:.3} Hz{preferred}");
+    } else {
+        println!("  Disabled");
+    }
+
+    if vrr_supported {
+        let enabled = if vrr_enabled { "enabled" } else { "disabled" };
+        println!("  Variable refresh rate: supported, {enabled}");
+    } else {
+        println!("  Variable refresh rate: not supported");
+    }
+
+    if let Some((width, height)) = physical_size {
+        println!("  Physical size: {width}x{height} mm");
+    } else {
+        println!("  Physical size: unknown");
+    }
+
+    if let Some(logical) = logical {
+        let LogicalOutput {
+            x,
+            y,
+            width,
+            height,
+            scale,
+            transform,
+        } = logical;
+        println!("  Logical position: {x}, {y}");
+        println!("  Logical size: {width}x{height}");
+        println!("  Scale: {scale}");
+
+        let transform = match transform {
+            Transform::Normal => "normal",
+            Transform::_90 => "90° counter-clockwise",
+            Transform::_180 => "180°",
+            Transform::_270 => "270° counter-clockwise",
+            Transform::Flipped => "flipped horizontally",
+            Transform::Flipped90 => "90° counter-clockwise, flipped horizontally",
+            Transform::Flipped180 => "flipped vertically",
+            Transform::Flipped270 => "270° counter-clockwise, flipped horizontally",
+        };
+        println!("  Transform: {transform}");
+    }
+
+    println!("  Available modes:");
+    for (idx, mode) in modes.into_iter().enumerate() {
+        let Mode {
+            width,
+            height,
+            refresh_rate,
+            is_preferred,
+        } = mode;
+        let refresh = refresh_rate as f64 / 1000.;
+
+        let is_current = Some(idx) == current_mode;
+        let qualifier = match (is_current, is_preferred) {
+            (true, true) => " (current, preferred)",
+            (true, false) => " (current)",
+            (false, true) => " (preferred)",
+            (false, false) => "",
+        };
+
+        println!("    {width}x{height}@{refresh:.3}{qualifier}");
+    }
+    Ok(())
+}
+
+fn print_window(window: &Window) {
+    let focused = if window.is_focused { " (focused)" } else { "" };
+    println!("Window ID {}:{focused}", window.id);
+
+    if let Some(title) = &window.title {
+        println!("  Title: \"{title}\"");
+    } else {
+        println!("  Title: (unset)");
+    }
+
+    if let Some(app_id) = &window.app_id {
+        println!("  App ID: \"{app_id}\"");
+    } else {
+        println!("  App ID: (unset)");
+    }
+
+    println!(
+        "  Is floating: {}",
+        if window.is_floating { "yes" } else { "no" }
+    );
+
+    if let Some(pid) = window.pid {
+        println!("  PID: {pid}");
+    } else {
+        println!("  PID: (unknown)");
+    }
+
+    if let Some(workspace_id) = window.workspace_id {
+        println!("  Workspace ID: {workspace_id}");
+    } else {
+        println!("  Workspace ID: (none)");
+    }
+}

src/ipc/mod.rs

@@ -0,0 +1,2 @@
+pub mod client;
+pub mod server;

src/ipc/server.rs

@@ -0,0 +1,637 @@
+use std::cell::RefCell;
+use std::collections::HashSet;
+use std::os::unix::net::{UnixListener, UnixStream};
+use std::path::PathBuf;
+use std::rc::Rc;
+use std::sync::{Arc, Mutex};
+use std::{env, io, process};
+
+use anyhow::Context;
+use async_channel::{Receiver, Sender, TrySendError};
+use calloop::futures::Scheduler;
+use calloop::io::Async;
+use directories::BaseDirs;
+use futures_util::io::{AsyncReadExt, BufReader};
+use futures_util::{select_biased, AsyncBufReadExt, AsyncWrite, AsyncWriteExt, FutureExt as _};
+use niri_config::OutputName;
+use niri_ipc::state::{EventStreamState, EventStreamStatePart as _};
+use niri_ipc::{Event, KeyboardLayouts, OutputConfigChanged, Reply, Request, Response, Workspace};
+use smithay::desktop::layer_map_for_output;
+use smithay::reexports::calloop::generic::Generic;
+use smithay::reexports::calloop::{Interest, LoopHandle, Mode, PostAction};
+use smithay::reexports::rustix::fs::unlink;
+use smithay::wayland::shell::wlr_layer::{KeyboardInteractivity, Layer};
+
+use crate::backend::IpcOutputMap;
+use crate::layout::workspace::WorkspaceId;
+use crate::niri::State;
+use crate::utils::{version, with_toplevel_role};
+use crate::window::Mapped;
+
+// If an event stream client fails to read events fast enough that we accumulate more than this
+// number in our buffer, we drop that event stream client.
+const EVENT_STREAM_BUFFER_SIZE: usize = 64;
+
+pub struct IpcServer {
+    pub socket_path: PathBuf,
+    event_streams: Rc<RefCell<Vec<EventStreamSender>>>,
+    event_stream_state: Rc<RefCell<EventStreamState>>,
+}
+
+struct ClientCtx {
+    event_loop: LoopHandle<'static, State>,
+    scheduler: Scheduler<()>,
+    ipc_outputs: Arc<Mutex<IpcOutputMap>>,
+    event_streams: Rc<RefCell<Vec<EventStreamSender>>>,
+    event_stream_state: Rc<RefCell<EventStreamState>>,
+}
+
+struct EventStreamClient {
+    events: Receiver<Event>,
+    disconnect: Receiver<()>,
+    write: Box<dyn AsyncWrite + Unpin>,
+}
+
+struct EventStreamSender {
+    events: Sender<Event>,
+    disconnect: Sender<()>,
+}
+
+impl IpcServer {
+    pub fn start(
+        event_loop: &LoopHandle<'static, State>,
+        wayland_socket_name: &str,
+    ) -> anyhow::Result<Self> {
+        let _span = tracy_client::span!("Ipc::start");
+
+        let socket_name = format!("niri.{wayland_socket_name}.{}.sock", process::id());
+        let mut socket_path = socket_dir();
+        socket_path.push(socket_name);
+
+        let listener = UnixListener::bind(&socket_path).context("error binding socket")?;
+        listener
+            .set_nonblocking(true)
+            .context("error setting socket to non-blocking")?;
+
+        let source = Generic::new(listener, Interest::READ, Mode::Level);
+        event_loop
+            .insert_source(source, |_, socket, state| {
+                match socket.accept() {
+                    Ok((stream, _)) => on_new_ipc_client(state, stream),
+                    Err(e) if e.kind() == io::ErrorKind::WouldBlock => (),
+                    Err(e) => return Err(e),
+                }
+
+                Ok(PostAction::Continue)
+            })
+            .unwrap();
+
+        Ok(Self {
+            socket_path,
+            event_streams: Rc::new(RefCell::new(Vec::new())),
+            event_stream_state: Rc::new(RefCell::new(EventStreamState::default())),
+        })
+    }
+
+    fn send_event(&self, event: Event) {
+        let mut streams = self.event_streams.borrow_mut();
+        let mut to_remove = Vec::new();
+        for (idx, stream) in streams.iter_mut().enumerate() {
+            match stream.events.try_send(event.clone()) {
+                Ok(()) => (),
+                Err(TrySendError::Closed(_)) => to_remove.push(idx),
+                Err(TrySendError::Full(_)) => {
+                    warn!(
+                        "disconnecting IPC event stream client \
+                         because it is reading events too slowly"
+                    );
+                    to_remove.push(idx);
+                }
+            }
+        }
+
+        for idx in to_remove.into_iter().rev() {
+            let stream = streams.swap_remove(idx);
+            let _ = stream.disconnect.send_blocking(());
+        }
+    }
+}
+
+impl Drop for IpcServer {
+    fn drop(&mut self) {
+        let _ = unlink(&self.socket_path);
+    }
+}
+
+fn socket_dir() -> PathBuf {
+    BaseDirs::new()
+        .as_ref()
+        .and_then(|x| x.runtime_dir())
+        .map(|x| x.to_owned())
+        .unwrap_or_else(env::temp_dir)
+}
+
+fn on_new_ipc_client(state: &mut State, stream: UnixStream) {
+    let _span = tracy_client::span!("on_new_ipc_client");
+    trace!("new IPC client connected");
+
+    let stream = match state.niri.event_loop.adapt_io(stream) {
+        Ok(stream) => stream,
+        Err(err) => {
+            warn!("error making IPC stream async: {err:?}");
+            return;
+        }
+    };
+
+    let ipc_server = state.niri.ipc_server.as_ref().unwrap();
+
+    let ctx = ClientCtx {
+        event_loop: state.niri.event_loop.clone(),
+        scheduler: state.niri.scheduler.clone(),
+        ipc_outputs: state.backend.ipc_outputs(),
+        event_streams: ipc_server.event_streams.clone(),
+        event_stream_state: ipc_server.event_stream_state.clone(),
+    };
+
+    let future = async move {
+        if let Err(err) = handle_client(ctx, stream).await {
+            warn!("error handling IPC client: {err:?}");
+        }
+    };
+    if let Err(err) = state.niri.scheduler.schedule(future) {
+        warn!("error scheduling IPC stream future: {err:?}");
+    }
+}
+
+async fn handle_client(ctx: ClientCtx, stream: Async<'static, UnixStream>) -> anyhow::Result<()> {
+    let (read, mut write) = stream.split();
+    let mut buf = String::new();
+
+    // Read a single line to allow extensibility in the future to keep reading.
+    BufReader::new(read)
+        .read_line(&mut buf)
+        .await
+        .context("error reading request")?;
+
+    let request = serde_json::from_str(&buf)
+        .context("error parsing request")
+        .map_err(|err| err.to_string());
+    let requested_error = matches!(request, Ok(Request::ReturnError));
+    let requested_event_stream = matches!(request, Ok(Request::EventStream));
+
+    let reply = match request {
+        Ok(request) => process(&ctx, request).await,
+        Err(err) => Err(err),
+    };
+
+    if let Err(err) = &reply {
+        if !requested_error {
+            warn!("error processing IPC request: {err:?}");
+        }
+    }
+
+    let mut buf = serde_json::to_vec(&reply).context("error formatting reply")?;
+    buf.push(b'\n');
+    write.write_all(&buf).await.context("error writing reply")?;
+
+    if requested_event_stream {
+        let (events_tx, events_rx) = async_channel::bounded(EVENT_STREAM_BUFFER_SIZE);
+        let (disconnect_tx, disconnect_rx) = async_channel::bounded(1);
+
+        // Spawn a task for the client.
+        let client = EventStreamClient {
+            events: events_rx,
+            disconnect: disconnect_rx,
+            write: Box::new(write) as _,
+        };
+        let future = async move {
+            if let Err(err) = handle_event_stream_client(client).await {
+                warn!("error handling IPC event stream client: {err:?}");
+            }
+        };
+        if let Err(err) = ctx.scheduler.schedule(future) {
+            warn!("error scheduling IPC event stream future: {err:?}");
+        }
+
+        // Send the initial state.
+        {
+            let state = ctx.event_stream_state.borrow();
+            for event in state.replicate() {
+                events_tx
+                    .try_send(event)
+                    .expect("initial event burst had more events than buffer size");
+            }
+        }
+
+        // Add it to the list.
+        {
+            let mut streams = ctx.event_streams.borrow_mut();
+            let sender = EventStreamSender {
+                events: events_tx,
+                disconnect: disconnect_tx,
+            };
+            streams.push(sender);
+        }
+    }
+
+    Ok(())
+}
+
+async fn process(ctx: &ClientCtx, request: Request) -> Reply {
+    let response = match request {
+        Request::ReturnError => return Err(String::from("example compositor error")),
+        Request::Version => Response::Version(version()),
+        Request::Outputs => {
+            let ipc_outputs = ctx.ipc_outputs.lock().unwrap().clone();
+            let outputs = ipc_outputs.values().cloned().map(|o| (o.name.clone(), o));
+            Response::Outputs(outputs.collect())
+        }
+        Request::Workspaces => {
+            let state = ctx.event_stream_state.borrow();
+            let workspaces = state.workspaces.workspaces.values().cloned().collect();
+            Response::Workspaces(workspaces)
+        }
+        Request::Windows => {
+            let state = ctx.event_stream_state.borrow();
+            let windows = state.windows.windows.values().cloned().collect();
+            Response::Windows(windows)
+        }
+        Request::Layers => {
+            let (tx, rx) = async_channel::bounded(1);
+            ctx.event_loop.insert_idle(move |state| {
+                let mut layers = Vec::new();
+                for output in state.niri.global_space.outputs() {
+                    let name = output.name();
+                    for surface in layer_map_for_output(output).layers() {
+                        let layer = match surface.layer() {
+                            Layer::Background => niri_ipc::Layer::Background,
+                            Layer::Bottom => niri_ipc::Layer::Bottom,
+                            Layer::Top => niri_ipc::Layer::Top,
+                            Layer::Overlay => niri_ipc::Layer::Overlay,
+                        };
+                        let keyboard_interactivity =
+                            match surface.cached_state().keyboard_interactivity {
+                                KeyboardInteractivity::None => {
+                                    niri_ipc::LayerSurfaceKeyboardInteractivity::None
+                                }
+                                KeyboardInteractivity::Exclusive => {
+                                    niri_ipc::LayerSurfaceKeyboardInteractivity::Exclusive
+                                }
+                                KeyboardInteractivity::OnDemand => {
+                                    niri_ipc::LayerSurfaceKeyboardInteractivity::OnDemand
+                                }
+                            };
+
+                        layers.push(niri_ipc::LayerSurface {
+                            namespace: surface.namespace().to_owned(),
+                            output: name.clone(),
+                            layer,
+                            keyboard_interactivity,
+                        });
+                    }
+                }
+
+                let _ = tx.send_blocking(layers);
+            });
+            let result = rx.recv().await;
+            let layers = result.map_err(|_| String::from("error getting layers info"))?;
+            Response::Layers(layers)
+        }
+        Request::KeyboardLayouts => {
+            let state = ctx.event_stream_state.borrow();
+            let layout = state.keyboard_layouts.keyboard_layouts.clone();
+            let layout = layout.expect("keyboard layouts should be set at startup");
+            Response::KeyboardLayouts(layout)
+        }
+        Request::FocusedWindow => {
+            let state = ctx.event_stream_state.borrow();
+            let windows = &state.windows.windows;
+            let window = windows.values().find(|win| win.is_focused).cloned();
+            Response::FocusedWindow(window)
+        }
+        Request::Action(action) => {
+            let (tx, rx) = async_channel::bounded(1);
+
+            let action = niri_config::Action::from(action);
+            ctx.event_loop.insert_idle(move |state| {
+                // Make sure some logic like workspace clean-up has a chance to run before doing
+                // actions.
+                state.niri.advance_animations();
+                state.do_action(action, false);
+                let _ = tx.send_blocking(());
+            });
+
+            // Wait until the action has been processed before returning. This is important for a
+            // few actions, for instance for DoScreenTransition this wait ensures that the screen
+            // contents were sampled into the texture.
+            let _ = rx.recv().await;
+            Response::Handled
+        }
+        Request::Output { output, action } => {
+            let ipc_outputs = ctx.ipc_outputs.lock().unwrap();
+            let found = ipc_outputs
+                .values()
+                .any(|o| OutputName::from_ipc_output(o).matches(&output));
+            let response = if found {
+                OutputConfigChanged::Applied
+            } else {
+                OutputConfigChanged::OutputWasMissing
+            };
+            drop(ipc_outputs);
+
+            ctx.event_loop.insert_idle(move |state| {
+                state.apply_transient_output_config(&output, action);
+            });
+
+            Response::OutputConfigChanged(response)
+        }
+        Request::FocusedOutput => {
+            let (tx, rx) = async_channel::bounded(1);
+            ctx.event_loop.insert_idle(move |state| {
+                let active_output = state
+                    .niri
+                    .layout
+                    .active_output()
+                    .map(|output| output.name());
+
+                let output = active_output.and_then(|active_output| {
+                    state
+                        .backend
+                        .ipc_outputs()
+                        .lock()
+                        .unwrap()
+                        .values()
+                        .find(|o| o.name == active_output)
+                        .cloned()
+                });
+
+                let _ = tx.send_blocking(output);
+            });
+            let result = rx.recv().await;
+            let output = result.map_err(|_| String::from("error getting active output info"))?;
+            Response::FocusedOutput(output)
+        }
+        Request::EventStream => Response::Handled,
+    };
+
+    Ok(response)
+}
+
+async fn handle_event_stream_client(client: EventStreamClient) -> anyhow::Result<()> {
+    let EventStreamClient {
+        events,
+        disconnect,
+        mut write,
+    } = client;
+
+    while let Ok(event) = events.recv().await {
+        let mut buf = serde_json::to_vec(&event).context("error formatting event")?;
+        buf.push(b'\n');
+
+        let res = select_biased! {
+            _ = disconnect.recv().fuse() => return Ok(()),
+            res = write.write_all(&buf).fuse() => res,
+        };
+
+        match res {
+            Ok(()) => (),
+            // Normal client disconnection.
+            Err(err) if err.kind() == io::ErrorKind::BrokenPipe => return Ok(()),
+            res @ Err(_) => res.context("error writing event")?,
+        }
+    }
+
+    Ok(())
+}
+
+fn make_ipc_window(mapped: &Mapped, workspace_id: Option<WorkspaceId>) -> niri_ipc::Window {
+    with_toplevel_role(mapped.toplevel(), |role| niri_ipc::Window {
+        id: mapped.id().get(),
+        title: role.title.clone(),
+        app_id: role.app_id.clone(),
+        pid: mapped.credentials().map(|c| c.pid),
+        workspace_id: workspace_id.map(|id| id.get()),
+        is_focused: mapped.is_focused(),
+        is_floating: mapped.is_floating(),
+    })
+}
+
+impl State {
+    pub fn ipc_keyboard_layouts_changed(&mut self) {
+        let keyboard = self.niri.seat.get_keyboard().unwrap();
+        let keyboard_layouts = keyboard.with_xkb_state(self, |context| {
+            let xkb = context.xkb().lock().unwrap();
+            let layouts = xkb.layouts();
+            KeyboardLayouts {
+                names: layouts
+                    .map(|layout| xkb.layout_name(layout).to_owned())
+                    .collect(),
+                current_idx: xkb.active_layout().0 as u8,
+            }
+        });
+
+        let Some(server) = &self.niri.ipc_server else {
+            return;
+        };
+
+        let mut state = server.event_stream_state.borrow_mut();
+        let state = &mut state.keyboard_layouts;
+
+        let event = Event::KeyboardLayoutsChanged { keyboard_layouts };
+        state.apply(event.clone());
+        server.send_event(event);
+    }
+
+    pub fn ipc_refresh_keyboard_layout_index(&mut self) {
+        let keyboard = self.niri.seat.get_keyboard().unwrap();
+        let idx = keyboard.with_xkb_state(self, |context| {
+            let xkb = context.xkb().lock().unwrap();
+            xkb.active_layout().0 as u8
+        });
+
+        let Some(server) = &self.niri.ipc_server else {
+            return;
+        };
+
+        let mut state = server.event_stream_state.borrow_mut();
+        let state = &mut state.keyboard_layouts;
+
+        if state.keyboard_layouts.as_ref().unwrap().current_idx == idx {
+            return;
+        }
+
+        let event = Event::KeyboardLayoutSwitched { idx };
+        state.apply(event.clone());
+        server.send_event(event);
+    }
+
+    pub fn ipc_refresh_layout(&mut self) {
+        self.ipc_refresh_workspaces();
+        self.ipc_refresh_windows();
+    }
+
+    fn ipc_refresh_workspaces(&mut self) {
+        let Some(server) = &self.niri.ipc_server else {
+            return;
+        };
+
+        let _span = tracy_client::span!("State::ipc_refresh_workspaces");
+
+        let mut state = server.event_stream_state.borrow_mut();
+        let state = &mut state.workspaces;
+
+        let mut events = Vec::new();
+        let layout = &self.niri.layout;
+        let focused_ws_id = layout.active_workspace().map(|ws| ws.id().get());
+
+        // Check for workspace changes.
+        let mut seen = HashSet::new();
+        let mut need_workspaces_changed = false;
+        for (mon, ws_idx, ws) in layout.workspaces() {
+            let id = ws.id().get();
+            seen.insert(id);
+
+            let Some(ipc_ws) = state.workspaces.get(&id) else {
+                // A new workspace was added.
+                need_workspaces_changed = true;
+                break;
+            };
+
+            // Check for any changes that we can't signal as individual events.
+            let output_name = mon.map(|mon| mon.output_name());
+            if ipc_ws.idx != u8::try_from(ws_idx + 1).unwrap_or(u8::MAX)
+                || ipc_ws.name.as_ref() != ws.name()
+                || ipc_ws.output.as_ref() != output_name
+            {
+                need_workspaces_changed = true;
+                break;
+            }
+
+            let active_window_id = ws.active_window().map(|win| win.id().get());
+            if ipc_ws.active_window_id != active_window_id {
+                events.push(Event::WorkspaceActiveWindowChanged {
+                    workspace_id: id,
+                    active_window_id,
+                });
+            }
+
+            // Check if this workspace became focused.
+            let is_focused = Some(id) == focused_ws_id;
+            if is_focused && !ipc_ws.is_focused {
+                events.push(Event::WorkspaceActivated { id, focused: true });
+                continue;
+            }
+
+            // Check if this workspace became active.
+            let is_active = mon.is_some_and(|mon| mon.active_workspace_idx() == ws_idx);
+            if is_active && !ipc_ws.is_active {
+                events.push(Event::WorkspaceActivated { id, focused: false });
+            }
+        }
+
+        // Check if any workspaces were removed.
+        if !need_workspaces_changed && state.workspaces.keys().any(|id| !seen.contains(id)) {
+            need_workspaces_changed = true;
+        }
+
+        if need_workspaces_changed {
+            events.clear();
+
+            let workspaces = layout
+                .workspaces()
+                .map(|(mon, ws_idx, ws)| {
+                    let id = ws.id().get();
+                    Workspace {
+                        id,
+                        idx: u8::try_from(ws_idx + 1).unwrap_or(u8::MAX),
+                        name: ws.name().cloned(),
+                        output: mon.map(|mon| mon.output_name().clone()),
+                        is_active: mon.is_some_and(|mon| mon.active_workspace_idx() == ws_idx),
+                        is_focused: Some(id) == focused_ws_id,
+                        active_window_id: ws.active_window().map(|win| win.id().get()),
+                    }
+                })
+                .collect();
+
+            events.push(Event::WorkspacesChanged { workspaces });
+        }
+
+        for event in events {
+            state.apply(event.clone());
+            server.send_event(event);
+        }
+    }
+
+    fn ipc_refresh_windows(&mut self) {
+        let Some(server) = &self.niri.ipc_server else {
+            return;
+        };
+
+        let _span = tracy_client::span!("State::ipc_refresh_windows");
+
+        let mut state = server.event_stream_state.borrow_mut();
+        let state = &mut state.windows;
+
+        let mut events = Vec::new();
+        let layout = &self.niri.layout;
+
+        // Check for window changes.
+        let mut seen = HashSet::new();
+        let mut focused_id = None;
+        layout.with_windows(|mapped, _, ws_id| {
+            let id = mapped.id().get();
+            seen.insert(id);
+
+            if mapped.is_focused() {
+                focused_id = Some(id);
+            }
+
+            let Some(ipc_win) = state.windows.get(&id) else {
+                let window = make_ipc_window(mapped, ws_id);
+                events.push(Event::WindowOpenedOrChanged { window });
+                return;
+            };
+
+            let workspace_id = ws_id.map(|id| id.get());
+            let mut changed =
+                ipc_win.workspace_id != workspace_id || ipc_win.is_floating != mapped.is_floating();
+
+            changed |= with_toplevel_role(mapped.toplevel(), |role| {
+                ipc_win.title != role.title || ipc_win.app_id != role.app_id
+            });
+
+            if changed {
+                let window = make_ipc_window(mapped, ws_id);
+                events.push(Event::WindowOpenedOrChanged { window });
+                return;
+            }
+
+            if mapped.is_focused() && !ipc_win.is_focused {
+                events.push(Event::WindowFocusChanged { id: Some(id) });
+            }
+        });
+
+        // Check for closed windows.
+        let mut ipc_focused_id = None;
+        for (id, ipc_win) in &state.windows {
+            if !seen.contains(id) {
+                events.push(Event::WindowClosed { id: *id });
+            }
+
+            if ipc_win.is_focused {
+                ipc_focused_id = Some(id);
+            }
+        }
+
+        // Extra check for focus becoming None, since the checks above only work for focus becoming
+        // a different window.
+        if focused_id.is_none() && ipc_focused_id.is_some() {
+            events.push(Event::WindowFocusChanged { id: None });
+        }
+
+        for event in events {
+            state.apply(event.clone());
+            server.send_event(event);
+        }
+    }
+}

src/layer/mapped.rs

@@ -0,0 +1,122 @@
+use std::cell::RefCell;
+
+use niri_config::layer_rule::LayerRule;
+use smithay::backend::renderer::element::surface::{
+    render_elements_from_surface_tree, WaylandSurfaceRenderElement,
+};
+use smithay::backend::renderer::element::Kind;
+use smithay::desktop::{LayerSurface, PopupManager};
+use smithay::utils::{Logical, Rectangle, Scale};
+
+use super::ResolvedLayerRules;
+use crate::niri_render_elements;
+use crate::render_helpers::renderer::NiriRenderer;
+use crate::render_helpers::solid_color::{SolidColorBuffer, SolidColorRenderElement};
+use crate::render_helpers::{RenderTarget, SplitElements};
+
+#[derive(Debug)]
+pub struct MappedLayer {
+    /// The surface itself.
+    surface: LayerSurface,
+
+    /// Up-to-date rules.
+    rules: ResolvedLayerRules,
+
+    /// Buffer to draw instead of the surface when it should be blocked out.
+    block_out_buffer: RefCell<SolidColorBuffer>,
+}
+
+niri_render_elements! {
+    LayerSurfaceRenderElement<R> => {
+        Wayland = WaylandSurfaceRenderElement<R>,
+        SolidColor = SolidColorRenderElement,
+    }
+}
+
+impl MappedLayer {
+    pub fn new(surface: LayerSurface, rules: ResolvedLayerRules) -> Self {
+        Self {
+            surface,
+            rules,
+            block_out_buffer: RefCell::new(SolidColorBuffer::new((0., 0.), [0., 0., 0., 1.])),
+        }
+    }
+
+    pub fn surface(&self) -> &LayerSurface {
+        &self.surface
+    }
+
+    pub fn rules(&self) -> &ResolvedLayerRules {
+        &self.rules
+    }
+
+    /// Recomputes the resolved layer rules and returns whether they changed.
+    pub fn recompute_layer_rules(&mut self, rules: &[LayerRule], is_at_startup: bool) -> bool {
+        let new_rules = ResolvedLayerRules::compute(rules, &self.surface, is_at_startup);
+        if new_rules == self.rules {
+            return false;
+        }
+
+        self.rules = new_rules;
+        true
+    }
+
+    pub fn render<R: NiriRenderer>(
+        &self,
+        renderer: &mut R,
+        geometry: Rectangle<i32, Logical>,
+        scale: Scale<f64>,
+        target: RenderTarget,
+    ) -> SplitElements<LayerSurfaceRenderElement<R>> {
+        let mut rv = SplitElements::default();
+
+        let alpha = self.rules.opacity.unwrap_or(1.).clamp(0., 1.);
+
+        if target.should_block_out(self.rules.block_out_from) {
+            // Round to physical pixels.
+            let geometry = geometry
+                .to_f64()
+                .to_physical_precise_round(scale)
+                .to_logical(scale);
+
+            let mut buffer = self.block_out_buffer.borrow_mut();
+            buffer.resize(geometry.size.to_f64());
+            let elem = SolidColorRenderElement::from_buffer(
+                &buffer,
+                geometry.loc,
+                alpha,
+                Kind::Unspecified,
+            );
+            rv.normal.push(elem.into());
+        } else {
+            // Layer surfaces don't have extra geometry like windows.
+            let buf_pos = geometry.loc;
+
+            let surface = self.surface.wl_surface();
+            for (popup, popup_offset) in PopupManager::popups_for_surface(surface) {
+                // Layer surfaces don't have extra geometry like windows.
+                let offset = popup_offset - popup.geometry().loc;
+
+                rv.popups.extend(render_elements_from_surface_tree(
+                    renderer,
+                    popup.wl_surface(),
+                    (buf_pos + offset).to_physical_precise_round(scale),
+                    scale,
+                    alpha,
+                    Kind::Unspecified,
+                ));
+            }
+
+            rv.normal = render_elements_from_surface_tree(
+                renderer,
+                surface,
+                buf_pos.to_physical_precise_round(scale),
+                scale,
+                alpha,
+                Kind::Unspecified,
+            );
+        }
+
+        rv
+    }
+}

src/layer/mod.rs

@@ -0,0 +1,69 @@
+use niri_config::layer_rule::{LayerRule, Match};
+use niri_config::BlockOutFrom;
+use smithay::desktop::LayerSurface;
+
+pub mod mapped;
+pub use mapped::MappedLayer;
+
+/// Rules fully resolved for a layer-shell surface.
+#[derive(Debug, PartialEq)]
+pub struct ResolvedLayerRules {
+    /// Extra opacity to draw this window with.
+    pub opacity: Option<f32>,
+    /// Whether to block out this window from certain render targets.
+    pub block_out_from: Option<BlockOutFrom>,
+}
+
+impl ResolvedLayerRules {
+    pub const fn empty() -> Self {
+        Self {
+            opacity: None,
+            block_out_from: None,
+        }
+    }
+
+    pub fn compute(rules: &[LayerRule], surface: &LayerSurface, is_at_startup: bool) -> Self {
+        let _span = tracy_client::span!("ResolvedLayerRules::compute");
+
+        let mut resolved = ResolvedLayerRules::empty();
+
+        for rule in rules {
+            let matches = |m: &Match| {
+                if let Some(at_startup) = m.at_startup {
+                    if at_startup != is_at_startup {
+                        return false;
+                    }
+                }
+
+                surface_matches(surface, m)
+            };
+
+            if !(rule.matches.is_empty() || rule.matches.iter().any(matches)) {
+                continue;
+            }
+
+            if rule.excludes.iter().any(matches) {
+                continue;
+            }
+
+            if let Some(x) = rule.opacity {
+                resolved.opacity = Some(x);
+            }
+            if let Some(x) = rule.block_out_from {
+                resolved.block_out_from = Some(x);
+            }
+        }
+
+        resolved
+    }
+}
+
+fn surface_matches(surface: &LayerSurface, m: &Match) -> bool {
+    if let Some(namespace_re) = &m.namespace {
+        if !namespace_re.0.is_match(surface.namespace()) {
+            return false;
+        }
+    }
+
+    true
+}

src/layout/closing_window.rs

@@ -0,0 +1,275 @@
+use std::collections::HashMap;
+
+use anyhow::Context as _;
+use glam::{Mat3, Vec2};
+use niri_config::BlockOutFrom;
+use smithay::backend::allocator::Fourcc;
+use smithay::backend::renderer::element::utils::{
+    Relocate, RelocateRenderElement, RescaleRenderElement,
+};
+use smithay::backend::renderer::element::{Kind, RenderElement};
+use smithay::backend::renderer::gles::{GlesRenderer, GlesTexture, Uniform};
+use smithay::backend::renderer::Texture;
+use smithay::utils::{Logical, Point, Rectangle, Scale, Size, Transform};
+use smithay::wayland::compositor::{Blocker, BlockerState};
+
+use crate::animation::Animation;
+use crate::niri_render_elements;
+use crate::render_helpers::primary_gpu_texture::PrimaryGpuTextureRenderElement;
+use crate::render_helpers::shader_element::ShaderRenderElement;
+use crate::render_helpers::shaders::{mat3_uniform, ProgramType, Shaders};
+use crate::render_helpers::snapshot::RenderSnapshot;
+use crate::render_helpers::texture::{TextureBuffer, TextureRenderElement};
+use crate::render_helpers::{render_to_encompassing_texture, RenderTarget};
+use crate::utils::transaction::TransactionBlocker;
+
+#[derive(Debug)]
+pub struct ClosingWindow {
+    /// Contents of the window.
+    buffer: TextureBuffer<GlesTexture>,
+
+    /// Blocked-out contents of the window.
+    blocked_out_buffer: TextureBuffer<GlesTexture>,
+
+    /// Where the window should be blocked out from.
+    block_out_from: Option<BlockOutFrom>,
+
+    /// Size of the window geometry.
+    geo_size: Size<f64, Logical>,
+
+    /// Position in the workspace.
+    pos: Point<f64, Logical>,
+
+    /// How much the texture should be offset.
+    buffer_offset: Point<f64, Logical>,
+
+    /// How much the blocked-out texture should be offset.
+    blocked_out_buffer_offset: Point<f64, Logical>,
+
+    /// The closing animation.
+    anim_state: AnimationState,
+
+    /// Random seed for the shader.
+    random_seed: f32,
+}
+
+niri_render_elements! {
+    ClosingWindowRenderElement => {
+        Texture = RelocateRenderElement<RescaleRenderElement<PrimaryGpuTextureRenderElement>>,
+        Shader = ShaderRenderElement,
+    }
+}
+
+#[derive(Debug)]
+enum AnimationState {
+    Waiting {
+        /// Blocker for a transaction before starting the animation.
+        blocker: TransactionBlocker,
+        anim: Animation,
+    },
+    Animating(Animation),
+}
+
+impl AnimationState {
+    pub fn new(blocker: TransactionBlocker, anim: Animation) -> Self {
+        if blocker.state() == BlockerState::Pending {
+            Self::Waiting { blocker, anim }
+        } else {
+            // This actually doesn't normally happen because the window is removed only after the
+            // closing animation is created. Though, it does happen with disable-transactions debug
+            // flag.
+            Self::Animating(anim)
+        }
+    }
+}
+
+impl ClosingWindow {
+    pub fn new<E: RenderElement<GlesRenderer>>(
+        renderer: &mut GlesRenderer,
+        snapshot: RenderSnapshot<E, E>,
+        scale: Scale<f64>,
+        geo_size: Size<f64, Logical>,
+        pos: Point<f64, Logical>,
+        blocker: TransactionBlocker,
+        anim: Animation,
+    ) -> anyhow::Result<Self> {
+        let _span = tracy_client::span!("ClosingWindow::new");
+
+        let mut render_to_texture = |elements: Vec<E>| -> anyhow::Result<_> {
+            let (texture, _sync_point, geo) = render_to_encompassing_texture(
+                renderer,
+                scale,
+                Transform::Normal,
+                Fourcc::Abgr8888,
+                &elements,
+            )
+            .context("error rendering to texture")?;
+
+            let buffer = TextureBuffer::from_texture(
+                renderer,
+                texture,
+                scale,
+                Transform::Normal,
+                Vec::new(),
+            );
+
+            let offset = geo.loc.to_f64().to_logical(scale);
+
+            Ok((buffer, offset))
+        };
+
+        let (buffer, buffer_offset) =
+            render_to_texture(snapshot.contents).context("error rendering contents")?;
+        let (blocked_out_buffer, blocked_out_buffer_offset) =
+            render_to_texture(snapshot.blocked_out_contents)
+                .context("error rendering blocked-out contents")?;
+
+        Ok(Self {
+            buffer,
+            blocked_out_buffer,
+            block_out_from: snapshot.block_out_from,
+            geo_size,
+            pos,
+            buffer_offset,
+            blocked_out_buffer_offset,
+            anim_state: AnimationState::new(blocker, anim),
+            random_seed: fastrand::f32(),
+        })
+    }
+
+    pub fn advance_animations(&mut self) {
+        match &mut self.anim_state {
+            AnimationState::Waiting { blocker, anim } => {
+                if blocker.state() != BlockerState::Pending {
+                    let anim = anim.restarted(0., 1., 0.);
+                    self.anim_state = AnimationState::Animating(anim);
+                }
+            }
+            AnimationState::Animating(_anim) => (),
+        }
+    }
+
+    pub fn are_animations_ongoing(&self) -> bool {
+        match &self.anim_state {
+            AnimationState::Waiting { .. } => true,
+            AnimationState::Animating(anim) => !anim.is_done(),
+        }
+    }
+
+    pub fn render(
+        &self,
+        renderer: &mut GlesRenderer,
+        view_rect: Rectangle<f64, Logical>,
+        scale: Scale<f64>,
+        target: RenderTarget,
+    ) -> ClosingWindowRenderElement {
+        let (buffer, offset) = if target.should_block_out(self.block_out_from) {
+            (&self.blocked_out_buffer, self.blocked_out_buffer_offset)
+        } else {
+            (&self.buffer, self.buffer_offset)
+        };
+
+        let anim = match &self.anim_state {
+            AnimationState::Waiting { .. } => {
+                let elem = TextureRenderElement::from_texture_buffer(
+                    buffer.clone(),
+                    Point::from((0., 0.)),
+                    1.,
+                    None,
+                    None,
+                    Kind::Unspecified,
+                );
+
+                let elem = PrimaryGpuTextureRenderElement(elem);
+                let elem = RescaleRenderElement::from_element(elem, Point::from((0, 0)), 1.);
+
+                let mut location = self.pos + offset;
+                location.x -= view_rect.loc.x;
+                let elem = RelocateRenderElement::from_element(
+                    elem,
+                    location.to_physical_precise_round(scale),
+                    Relocate::Relative,
+                );
+
+                return elem.into();
+            }
+            AnimationState::Animating(anim) => anim,
+        };
+
+        let progress = anim.value();
+        let clamped_progress = anim.clamped_value().clamp(0., 1.);
+
+        if Shaders::get(renderer).program(ProgramType::Close).is_some() {
+            let area_loc = Vec2::new(view_rect.loc.x as f32, view_rect.loc.y as f32);
+            let area_size = Vec2::new(view_rect.size.w as f32, view_rect.size.h as f32);
+
+            // Round to physical pixels relative to the view position. This is similar to what
+            // happens when rendering normal windows.
+            let relative = self.pos - view_rect.loc;
+            let pos = view_rect.loc + relative.to_physical_precise_round(scale).to_logical(scale);
+
+            let geo_loc = Vec2::new(pos.x as f32, pos.y as f32);
+            let geo_size = Vec2::new(self.geo_size.w as f32, self.geo_size.h as f32);
+
+            let input_to_geo = Mat3::from_scale(area_size / geo_size)
+                * Mat3::from_translation((area_loc - geo_loc) / area_size);
+
+            let tex_scale = self.buffer.texture_scale();
+            let tex_scale = Vec2::new(tex_scale.x as f32, tex_scale.y as f32);
+            let tex_loc = Vec2::new(offset.x as f32, offset.y as f32);
+            let tex_size = self.buffer.texture().size();
+            let tex_size = Vec2::new(tex_size.w as f32, tex_size.h as f32) / tex_scale;
+
+            let geo_to_tex =
+                Mat3::from_translation(-tex_loc / tex_size) * Mat3::from_scale(geo_size / tex_size);
+
+            return ShaderRenderElement::new(
+                ProgramType::Close,
+                view_rect.size,
+                None,
+                scale.x as f32,
+                1.,
+                vec![
+                    mat3_uniform("niri_input_to_geo", input_to_geo),
+                    Uniform::new("niri_geo_size", geo_size.to_array()),
+                    mat3_uniform("niri_geo_to_tex", geo_to_tex),
+                    Uniform::new("niri_progress", progress as f32),
+                    Uniform::new("niri_clamped_progress", clamped_progress as f32),
+                    Uniform::new("niri_random_seed", self.random_seed),
+                ],
+                HashMap::from([(String::from("niri_tex"), buffer.texture().clone())]),
+                Kind::Unspecified,
+            )
+            .with_location(Point::from((0., 0.)))
+            .into();
+        }
+
+        let elem = TextureRenderElement::from_texture_buffer(
+            buffer.clone(),
+            Point::from((0., 0.)),
+            1. - clamped_progress as f32,
+            None,
+            None,
+            Kind::Unspecified,
+        );
+
+        let elem = PrimaryGpuTextureRenderElement(elem);
+
+        let center = self.geo_size.to_point().downscale(2.);
+        let elem = RescaleRenderElement::from_element(
+            elem,
+            (center - offset).to_physical_precise_round(scale),
+            ((1. - clamped_progress) / 5. + 0.8).max(0.),
+        );
+
+        let mut location = self.pos + offset;
+        location.x -= view_rect.loc.x;
+        let elem = RelocateRenderElement::from_element(
+            elem,
+            location.to_physical_precise_round(scale),
+            Relocate::Relative,
+        );
+
+        elem.into()
+    }
+}

src/layout/focus_ring.rs

@@ -0,0 +1,265 @@
+use std::iter::zip;
+
+use arrayvec::ArrayVec;
+use niri_config::{CornerRadius, Gradient, GradientInterpolation, GradientRelativeTo};
+use smithay::backend::renderer::element::Kind;
+use smithay::utils::{Logical, Point, Rectangle, Size};
+
+use crate::niri_render_elements;
+use crate::render_helpers::border::BorderRenderElement;
+use crate::render_helpers::renderer::NiriRenderer;
+use crate::render_helpers::solid_color::{SolidColorBuffer, SolidColorRenderElement};
+
+#[derive(Debug)]
+pub struct FocusRing {
+    buffers: [SolidColorBuffer; 8],
+    locations: [Point<f64, Logical>; 8],
+    sizes: [Size<f64, Logical>; 8],
+    borders: [BorderRenderElement; 8],
+    full_size: Size<f64, Logical>,
+    is_border: bool,
+    use_border_shader: bool,
+    config: niri_config::FocusRing,
+}
+
+niri_render_elements! {
+    FocusRingRenderElement => {
+        SolidColor = SolidColorRenderElement,
+        Gradient = BorderRenderElement,
+    }
+}
+
+impl FocusRing {
+    pub fn new(config: niri_config::FocusRing) -> Self {
+        Self {
+            buffers: Default::default(),
+            locations: Default::default(),
+            sizes: Default::default(),
+            borders: Default::default(),
+            full_size: Default::default(),
+            is_border: false,
+            use_border_shader: false,
+            config,
+        }
+    }
+
+    pub fn update_config(&mut self, config: niri_config::FocusRing) {
+        self.config = config;
+    }
+
+    pub fn update_shaders(&mut self) {
+        for elem in &mut self.borders {
+            elem.damage_all();
+        }
+    }
+
+    pub fn update_render_elements(
+        &mut self,
+        win_size: Size<f64, Logical>,
+        is_active: bool,
+        is_border: bool,
+        view_rect: Rectangle<f64, Logical>,
+        radius: CornerRadius,
+        scale: f64,
+    ) {
+        let width = self.config.width.0;
+        self.full_size = win_size + Size::from((width, width)).upscale(2.);
+
+        let color = if is_active {
+            self.config.active_color
+        } else {
+            self.config.inactive_color
+        };
+
+        for buf in &mut self.buffers {
+            buf.set_color(color.to_array_premul());
+        }
+
+        let radius = radius.fit_to(self.full_size.w as f32, self.full_size.h as f32);
+
+        let gradient = if is_active {
+            self.config.active_gradient
+        } else {
+            self.config.inactive_gradient
+        };
+
+        self.use_border_shader = radius != CornerRadius::default() || gradient.is_some();
+
+        // Set the defaults for solid color + rounded corners.
+        let gradient = gradient.unwrap_or(Gradient {
+            from: color,
+            to: color,
+            angle: 0,
+            relative_to: GradientRelativeTo::Window,
+            in_: GradientInterpolation::default(),
+        });
+
+        let full_rect = Rectangle::new(Point::from((-width, -width)), self.full_size);
+        let gradient_area = match gradient.relative_to {
+            GradientRelativeTo::Window => full_rect,
+            GradientRelativeTo::WorkspaceView => view_rect,
+        };
+
+        let rounded_corner_border_width = if self.is_border {
+            // HACK: increase the border width used for the inner rounded corners a tiny bit to
+            // reduce background bleed.
+            width as f32 + 0.5
+        } else {
+            0.
+        };
+
+        let ceil = |logical: f64| (logical * scale).ceil() / scale;
+
+        // All of this stuff should end up aligned to physical pixels because:
+        // * Window size and border width are rounded to physical pixels before being passed to this
+        //   function.
+        // * We will ceil the corner radii below.
+        // * We do not divide anything, only add, subtract and multiply by integers.
+        // * At rendering time, tile positions are rounded to physical pixels.
+
+        if is_border {
+            let top_left = f64::max(width, ceil(f64::from(radius.top_left)));
+            let top_right = f64::min(
+                self.full_size.w - top_left,
+                f64::max(width, ceil(f64::from(radius.top_right))),
+            );
+            let bottom_left = f64::min(
+                self.full_size.h - top_left,
+                f64::max(width, ceil(f64::from(radius.bottom_left))),
+            );
+            let bottom_right = f64::min(
+                self.full_size.h - top_right,
+                f64::min(
+                    self.full_size.w - bottom_left,
+                    f64::max(width, ceil(f64::from(radius.bottom_right))),
+                ),
+            );
+
+            // Top edge.
+            self.sizes[0] = Size::from((win_size.w + width * 2. - top_left - top_right, width));
+            self.locations[0] = Point::from((-width + top_left, -width));
+
+            // Bottom edge.
+            self.sizes[1] =
+                Size::from((win_size.w + width * 2. - bottom_left - bottom_right, width));
+            self.locations[1] = Point::from((-width + bottom_left, win_size.h));
+
+            // Left edge.
+            self.sizes[2] = Size::from((width, win_size.h + width * 2. - top_left - bottom_left));
+            self.locations[2] = Point::from((-width, -width + top_left));
+
+            // Right edge.
+            self.sizes[3] = Size::from((width, win_size.h + width * 2. - top_right - bottom_right));
+            self.locations[3] = Point::from((win_size.w, -width + top_right));
+
+            // Top-left corner.
+            self.sizes[4] = Size::from((top_left, top_left));
+            self.locations[4] = Point::from((-width, -width));
+
+            // Top-right corner.
+            self.sizes[5] = Size::from((top_right, top_right));
+            self.locations[5] = Point::from((win_size.w + width - top_right, -width));
+
+            // Bottom-right corner.
+            self.sizes[6] = Size::from((bottom_right, bottom_right));
+            self.locations[6] = Point::from((
+                win_size.w + width - bottom_right,
+                win_size.h + width - bottom_right,
+            ));
+
+            // Bottom-left corner.
+            self.sizes[7] = Size::from((bottom_left, bottom_left));
+            self.locations[7] = Point::from((-width, win_size.h + width - bottom_left));
+
+            for (buf, size) in zip(&mut self.buffers, self.sizes) {
+                buf.resize(size);
+            }
+
+            for (border, (loc, size)) in zip(&mut self.borders, zip(self.locations, self.sizes)) {
+                border.update(
+                    size,
+                    Rectangle::new(gradient_area.loc - loc, gradient_area.size),
+                    gradient.in_,
+                    gradient.from,
+                    gradient.to,
+                    ((gradient.angle as f32) - 90.).to_radians(),
+                    Rectangle::new(full_rect.loc - loc, full_rect.size),
+                    rounded_corner_border_width,
+                    radius,
+                    scale as f32,
+                );
+            }
+        } else {
+            self.sizes[0] = self.full_size;
+            self.buffers[0].resize(self.sizes[0]);
+            self.locations[0] = Point::from((-width, -width));
+
+            self.borders[0].update(
+                self.sizes[0],
+                Rectangle::new(gradient_area.loc - self.locations[0], gradient_area.size),
+                gradient.in_,
+                gradient.from,
+                gradient.to,
+                ((gradient.angle as f32) - 90.).to_radians(),
+                Rectangle::new(full_rect.loc - self.locations[0], full_rect.size),
+                rounded_corner_border_width,
+                radius,
+                scale as f32,
+            );
+        }
+
+        self.is_border = is_border;
+    }
+
+    pub fn render(
+        &self,
+        renderer: &mut impl NiriRenderer,
+        location: Point<f64, Logical>,
+    ) -> impl Iterator<Item = FocusRingRenderElement> {
+        let mut rv = ArrayVec::<_, 8>::new();
+
+        if self.config.off {
+            return rv.into_iter();
+        }
+
+        let border_width = -self.locations[0].y;
+
+        // If drawing as a border with width = 0, then there's nothing to draw.
+        if self.is_border && border_width == 0. {
+            return rv.into_iter();
+        }
+
+        let has_border_shader = BorderRenderElement::has_shader(renderer);
+
+        let mut push = |buffer, border: &BorderRenderElement, location: Point<f64, Logical>| {
+            let elem = if self.use_border_shader && has_border_shader {
+                border.clone().with_location(location).into()
+            } else {
+                SolidColorRenderElement::from_buffer(buffer, location, 1., Kind::Unspecified).into()
+            };
+            rv.push(elem);
+        };
+
+        if self.is_border {
+            for ((buf, border), loc) in zip(zip(&self.buffers, &self.borders), self.locations) {
+                push(buf, border, location + loc);
+            }
+        } else {
+            push(
+                &self.buffers[0],
+                &self.borders[0],
+                location + self.locations[0],
+            );
+        }
+
+        rv.into_iter()
+    }
+
+    pub fn width(&self) -> f64 {
+        self.config.width.0
+    }
+
+    pub fn is_off(&self) -> bool {
+        self.config.off
+    }
+}

src/layout/insert_hint_element.rs

@@ -0,0 +1,61 @@
+use niri_config::{CornerRadius, FloatOrInt};
+use smithay::utils::{Logical, Point, Rectangle, Size};
+
+use super::focus_ring::{FocusRing, FocusRingRenderElement};
+use crate::render_helpers::renderer::NiriRenderer;
+
+#[derive(Debug)]
+pub struct InsertHintElement {
+    inner: FocusRing,
+}
+
+pub type InsertHintRenderElement = FocusRingRenderElement;
+
+impl InsertHintElement {
+    pub fn new(config: niri_config::InsertHint) -> Self {
+        Self {
+            inner: FocusRing::new(niri_config::FocusRing {
+                off: config.off,
+                width: FloatOrInt(0.),
+                active_color: config.color,
+                inactive_color: config.color,
+                active_gradient: config.gradient,
+                inactive_gradient: config.gradient,
+            }),
+        }
+    }
+
+    pub fn update_config(&mut self, config: niri_config::InsertHint) {
+        self.inner.update_config(niri_config::FocusRing {
+            off: config.off,
+            width: FloatOrInt(0.),
+            active_color: config.color,
+            inactive_color: config.color,
+            active_gradient: config.gradient,
+            inactive_gradient: config.gradient,
+        });
+    }
+
+    pub fn update_shaders(&mut self) {
+        self.inner.update_shaders();
+    }
+
+    pub fn update_render_elements(
+        &mut self,
+        size: Size<f64, Logical>,
+        view_rect: Rectangle<f64, Logical>,
+        radius: CornerRadius,
+        scale: f64,
+    ) {
+        self.inner
+            .update_render_elements(size, true, false, view_rect, radius, scale);
+    }
+
+    pub fn render(
+        &self,
+        renderer: &mut impl NiriRenderer,
+        location: Point<f64, Logical>,
+    ) -> impl Iterator<Item = FocusRingRenderElement> {
+        self.inner.render(renderer, location)
+    }
+}

src/layout/opening_window.rs

@@ -0,0 +1,151 @@
+use std::collections::HashMap;
+
+use anyhow::Context as _;
+use glam::{Mat3, Vec2};
+use smithay::backend::allocator::Fourcc;
+use smithay::backend::renderer::element::utils::{
+    Relocate, RelocateRenderElement, RescaleRenderElement,
+};
+use smithay::backend::renderer::element::{Kind, RenderElement};
+use smithay::backend::renderer::gles::{GlesRenderer, Uniform};
+use smithay::backend::renderer::Texture;
+use smithay::utils::{Logical, Point, Rectangle, Scale, Size, Transform};
+
+use crate::animation::Animation;
+use crate::niri_render_elements;
+use crate::render_helpers::primary_gpu_texture::PrimaryGpuTextureRenderElement;
+use crate::render_helpers::render_to_encompassing_texture;
+use crate::render_helpers::shader_element::ShaderRenderElement;
+use crate::render_helpers::shaders::{mat3_uniform, ProgramType, Shaders};
+use crate::render_helpers::texture::{TextureBuffer, TextureRenderElement};
+
+#[derive(Debug)]
+pub struct OpenAnimation {
+    anim: Animation,
+    random_seed: f32,
+}
+
+niri_render_elements! {
+    OpeningWindowRenderElement => {
+        Texture = RelocateRenderElement<RescaleRenderElement<PrimaryGpuTextureRenderElement>>,
+        Shader = ShaderRenderElement,
+    }
+}
+
+impl OpenAnimation {
+    pub fn new(anim: Animation) -> Self {
+        Self {
+            anim,
+            random_seed: fastrand::f32(),
+        }
+    }
+
+    pub fn advance_animations(&mut self) {}
+
+    pub fn is_done(&self) -> bool {
+        self.anim.is_done()
+    }
+
+    // We can't depend on view_rect here, because the result of window opening can be snapshot and
+    // then rendered elsewhere.
+    pub fn render(
+        &self,
+        renderer: &mut GlesRenderer,
+        elements: &[impl RenderElement<GlesRenderer>],
+        geo_size: Size<f64, Logical>,
+        location: Point<f64, Logical>,
+        scale: Scale<f64>,
+    ) -> anyhow::Result<OpeningWindowRenderElement> {
+        let progress = self.anim.value();
+        let clamped_progress = self.anim.clamped_value().clamp(0., 1.);
+
+        let (texture, _sync_point, geo) = render_to_encompassing_texture(
+            renderer,
+            scale,
+            Transform::Normal,
+            Fourcc::Abgr8888,
+            elements,
+        )
+        .context("error rendering to texture")?;
+
+        let offset = geo.loc.to_f64().to_logical(scale);
+        let texture_size = geo.size.to_f64().to_logical(scale);
+
+        if Shaders::get(renderer).program(ProgramType::Open).is_some() {
+            let mut area = Rectangle::new(location + offset, texture_size);
+
+            // Expand the area a bit to allow for more varied effects.
+            let mut target_size = area.size.upscale(1.5);
+            target_size.w = f64::max(area.size.w + 1000., target_size.w);
+            target_size.h = f64::max(area.size.h + 1000., target_size.h);
+            let diff = (target_size.to_point() - area.size.to_point()).downscale(2.);
+            let diff = diff.to_physical_precise_round(scale).to_logical(scale);
+            area.loc -= diff;
+            area.size += diff.upscale(2.).to_size();
+
+            let area_loc = Vec2::new(area.loc.x as f32, area.loc.y as f32);
+            let area_size = Vec2::new(area.size.w as f32, area.size.h as f32);
+
+            let geo_loc = Vec2::new(location.x as f32, location.y as f32);
+            let geo_size = Vec2::new(geo_size.w as f32, geo_size.h as f32);
+
+            let input_to_geo = Mat3::from_scale(area_size / geo_size)
+                * Mat3::from_translation((area_loc - geo_loc) / area_size);
+
+            let tex_scale = Vec2::new(scale.x as f32, scale.y as f32);
+            let tex_loc = Vec2::new(offset.x as f32, offset.y as f32);
+            let tex_size = Vec2::new(texture.width() as f32, texture.height() as f32) / tex_scale;
+
+            let geo_to_tex =
+                Mat3::from_translation(-tex_loc / tex_size) * Mat3::from_scale(geo_size / tex_size);
+
+            return Ok(ShaderRenderElement::new(
+                ProgramType::Open,
+                area.size,
+                None,
+                scale.x as f32,
+                1.,
+                vec![
+                    mat3_uniform("niri_input_to_geo", input_to_geo),
+                    Uniform::new("niri_geo_size", geo_size.to_array()),
+                    mat3_uniform("niri_geo_to_tex", geo_to_tex),
+                    Uniform::new("niri_progress", progress as f32),
+                    Uniform::new("niri_clamped_progress", clamped_progress as f32),
+                    Uniform::new("niri_random_seed", self.random_seed),
+                ],
+                HashMap::from([(String::from("niri_tex"), texture.clone())]),
+                Kind::Unspecified,
+            )
+            .with_location(area.loc)
+            .into());
+        }
+
+        let buffer =
+            TextureBuffer::from_texture(renderer, texture, scale, Transform::Normal, Vec::new());
+        let elem = TextureRenderElement::from_texture_buffer(
+            buffer,
+            Point::from((0., 0.)),
+            clamped_progress as f32,
+            None,
+            None,
+            Kind::Unspecified,
+        );
+
+        let elem = PrimaryGpuTextureRenderElement(elem);
+
+        let center = geo_size.to_point().downscale(2.);
+        let elem = RescaleRenderElement::from_element(
+            elem,
+            (center - offset).to_physical_precise_round(scale),
+            (progress / 2. + 0.5).max(0.),
+        );
+
+        let elem = RelocateRenderElement::from_element(
+            elem,
+            (location + offset).to_physical_precise_round(scale),
+            Relocate::Relative,
+        );
+
+        Ok(elem.into())
+    }
+}