Add popups { opacity } window and layer rule

niri-config/src/layer_rule.rs

@@ -1,5 +1,6 @@
 use crate::appearance::{BackgroundEffectRule, BlockOutFrom, CornerRadius, ShadowRule};
 use crate::utils::RegexEq;
+use crate::window_rule::PopupsRule;
 
 #[derive(knuffel::Decode, Debug, Default, Clone, PartialEq)]
 pub struct LayerRule {
@@ -22,6 +23,8 @@ pub struct LayerRule {
     pub baba_is_float: Option<bool>,
     #[knuffel(child, default)]
     pub background_effect: BackgroundEffectRule,
+    #[knuffel(child, default)]
+    pub popups: PopupsRule,
 }
 
 #[derive(knuffel::Decode, Debug, Default, Clone, PartialEq)]

niri-config/src/lib.rs

@@ -59,7 +59,9 @@ use crate::recent_windows::RecentWindowsPart;
 pub use crate::recent_windows::{MruDirection, MruFilter, MruPreviews, MruScope, RecentWindows};
 pub use crate::utils::FloatOrInt;
 use crate::utils::{Flag, MergeWith as _};
-pub use crate::window_rule::{FloatingPosition, RelativeTo, WindowRule};
+pub use crate::window_rule::{
+    FloatingPosition, PopupsRule, RelativeTo, ResolvedPopupsRules, WindowRule,
+};
 pub use crate::workspace::{Workspace, WorkspaceLayoutPart};
 
 const RECURSION_LIMIT: u8 = 10;
@@ -1860,6 +1862,9 @@ mod tests {
                         noise: None,
                         saturation: None,
                     },
+                    popups: PopupsRule {
+                        opacity: None,
+                    },
                 },
             ],
             layer_rules: [
@@ -1901,6 +1906,9 @@ mod tests {
                         noise: None,
                         saturation: None,
                     },
+                    popups: PopupsRule {
+                        opacity: None,
+                    },
                 },
             ],
             binds: Binds(

niri-config/src/window_rule.rs

@@ -4,7 +4,7 @@ use crate::appearance::{
     BackgroundEffectRule, BlockOutFrom, BorderRule, CornerRadius, ShadowRule, TabIndicatorRule,
 };
 use crate::layout::DefaultPresetSize;
-use crate::utils::RegexEq;
+use crate::utils::{MergeWith, RegexEq};
 use crate::FloatOrInt;
 
 #[derive(knuffel::Decode, Debug, Default, Clone, PartialEq)]
@@ -76,6 +76,30 @@ pub struct WindowRule {
     pub tiled_state: Option<bool>,
     #[knuffel(child, default)]
     pub background_effect: BackgroundEffectRule,
+    #[knuffel(child, default)]
+    pub popups: PopupsRule,
+}
+
+/// Rules for popup surfaces.
+#[derive(knuffel::Decode, Debug, Default, Clone, PartialEq)]
+pub struct PopupsRule {
+    #[knuffel(child, unwrap(argument))]
+    pub opacity: Option<f32>,
+}
+
+/// Resolved popup-specific rules.
+#[derive(Debug, Default, Clone, Copy, PartialEq)]
+pub struct ResolvedPopupsRules {
+    /// Extra opacity to draw popups with.
+    pub opacity: Option<f32>,
+}
+
+impl MergeWith<PopupsRule> for ResolvedPopupsRules {
+    fn merge_with(&mut self, part: &PopupsRule) {
+        if let Some(x) = part.opacity {
+            self.opacity = Some(x);
+        }
+    }
 }
 
 #[derive(knuffel::Decode, Debug, Default, Clone, PartialEq)]

src/layer/mapped.rs

@@ -2,7 +2,7 @@ use niri_config::utils::MergeWith as _;
 use niri_config::{Config, LayerRule};
 use smithay::backend::renderer::element::surface::WaylandSurfaceRenderElement;
 use smithay::backend::renderer::element::Kind;
-use smithay::desktop::{LayerSurface, PopupManager};
+use smithay::desktop::{LayerSurface, PopupKind, PopupManager};
 use smithay::utils::{Logical, Point, Rectangle, Scale, Size};
 use smithay::wayland::compositor::{remove_pre_commit_hook, HookId};
 use smithay::wayland::shell::wlr_layer::{ExclusiveZone, Layer};
@@ -275,6 +275,13 @@ impl MappedLayer {
 
         let surface = self.surface.wl_surface();
         for (popup, offset) in PopupManager::popups_for_surface(surface) {
+            let popup_rules = match popup {
+                PopupKind::Xdg(_) => self.rules.popups,
+                // IME popups aren't affected by rules for regular popups.
+                PopupKind::InputMethod(_) => niri_config::ResolvedPopupsRules::default(),
+            };
+            let alpha = alpha * popup_rules.opacity.unwrap_or(1.).clamp(0., 1.);
+
             let surface = popup.wl_surface();
             let popup_geo = popup.geometry();
             let surface_loc = location + (offset - popup_geo.loc).to_f64();

src/layer/mod.rs

@@ -1,6 +1,6 @@
 use niri_config::layer_rule::{LayerRule, Match};
 use niri_config::utils::MergeWith as _;
-use niri_config::{BackgroundEffect, BlockOutFrom, CornerRadius, ShadowRule};
+use niri_config::{BackgroundEffect, BlockOutFrom, CornerRadius, ResolvedPopupsRules, ShadowRule};
 use smithay::desktop::LayerSurface;
 use smithay::wayland::shell::wlr_layer::Layer;
 
@@ -30,6 +30,9 @@ pub struct ResolvedLayerRules {
 
     /// Background effect configuration.
     pub background_effect: BackgroundEffect,
+
+    /// Rules for this layer surface's popups.
+    pub popups: ResolvedPopupsRules,
 }
 
 impl ResolvedLayerRules {
@@ -78,6 +81,8 @@ impl ResolvedLayerRules {
             resolved
                 .background_effect
                 .merge_with(&rule.background_effect);
+
+            resolved.popups.merge_with(&rule.popups);
         }
 
         resolved

src/window/mapped.rs

@@ -6,7 +6,7 @@ use smithay::backend::renderer::element::surface::WaylandSurfaceRenderElement;
 use smithay::backend::renderer::element::Kind;
 use smithay::backend::renderer::gles::GlesRenderer;
 use smithay::desktop::space::SpaceElement as _;
-use smithay::desktop::{PopupManager, Window};
+use smithay::desktop::{PopupKind, PopupManager, Window};
 use smithay::output::{self, Output};
 use smithay::reexports::wayland_protocols::xdg::decoration::zv1::server::zxdg_toplevel_decoration_v1;
 use smithay::reexports::wayland_protocols::xdg::shell::server::xdg_toplevel;
@@ -669,6 +669,13 @@ impl LayoutElement for Mapped {
 
         let surface = self.toplevel().wl_surface();
         for (popup, offset) in PopupManager::popups_for_surface(surface) {
+            let popup_rules = match popup {
+                PopupKind::Xdg(_) => self.rules.popups,
+                // IME popups aren't affected by rules for regular popups.
+                PopupKind::InputMethod(_) => niri_config::ResolvedPopupsRules::default(),
+            };
+            let alpha = alpha * popup_rules.opacity.unwrap_or(1.).clamp(0., 1.);
+
             let surface = popup.wl_surface();
             let popup_geo = popup.geometry();
             let surface_loc = location + (offset - popup.geometry().loc).to_f64();

src/window/mod.rs

@@ -4,7 +4,7 @@ use niri_config::utils::MergeWith as _;
 use niri_config::window_rule::{Match, WindowRule};
 use niri_config::{
     BackgroundEffect, BlockOutFrom, BorderRule, CornerRadius, FloatingPosition, PresetSize,
-    ShadowRule, TabIndicatorRule,
+    ResolvedPopupsRules, ShadowRule, TabIndicatorRule,
 };
 use niri_ipc::ColumnDisplay;
 use smithay::reexports::wayland_protocols::xdg::shell::server::xdg_toplevel;
@@ -122,6 +122,9 @@ pub struct ResolvedWindowRules {
 
     /// Background effect configuration.
     pub background_effect: BackgroundEffect,
+
+    /// Rules for this window's popups.
+    pub popups: ResolvedPopupsRules,
 }
 
 impl<'a> WindowRef<'a> {
@@ -303,6 +306,8 @@ impl ResolvedWindowRules {
                 resolved
                     .background_effect
                     .merge_with(&rule.background_effect);
+
+                resolved.popups.merge_with(&rule.popups);
             }
 
             resolved.open_on_output = open_on_output.map(|x| x.to_owned());