ipc: Add CastKind

niri-ipc/src/lib.rs

@@ -1490,6 +1490,8 @@ pub struct Cast {
     ///
     /// Do not confuse `session_id` with [`stream_id`](Self::stream_id).
     pub session_id: u64,
+    /// Kind of this screencast.
+    pub kind: CastKind,
     /// Target being captured.
     pub target: CastTarget,
     /// Whether this is a Dynamic Cast Target screencast.
@@ -1505,6 +1507,21 @@ pub struct Cast {
     pub is_active: bool,
 }
 
+/// Kind of screencast.
+#[derive(Serialize, Deserialize, Debug, Clone, Copy, PartialEq, Eq)]
+#[cfg_attr(feature = "json-schema", derive(schemars::JsonSchema))]
+pub enum CastKind {
+    /// PipeWire screencast, typically via xdg-desktop-portal-gnome.
+    PipeWire,
+    /// wlr-screencopy protocol screencast.
+    ///
+    /// Tools like wf-recorder, and the xdg-desktop-portal-wlr portal.
+    ///
+    /// Only wlr-screencopy with damage tracking is reported here. Screencopy without damage is
+    /// treated as a regular screenshot and not reported as a screencast.
+    WlrScreencopy,
+}
+
 /// Target of a screencast.
 #[derive(Serialize, Deserialize, Debug, Clone, PartialEq, Eq)]
 #[cfg_attr(feature = "json-schema", derive(schemars::JsonSchema))]

src/ipc/client.rs

@@ -7,7 +7,7 @@ use anyhow::{anyhow, bail, Context};
 use niri_config::OutputName;
 use niri_ipc::socket::Socket;
 use niri_ipc::{
-    Action, Cast, CastTarget, Event, KeyboardLayouts, LogicalOutput, Mode, Output,
+    Action, Cast, CastKind, CastTarget, Event, KeyboardLayouts, LogicalOutput, Mode, Output,
     OutputConfigChanged, Overview, Request, Response, Transform, Window, WindowLayout,
 };
 use serde_json::json;
@@ -743,6 +743,12 @@ fn print_cast(cast: &Cast) {
     println!("Cast stream ID {}:{active}", cast.stream_id);
     println!("  Session ID: {}", cast.session_id);
 
+    let kind = match cast.kind {
+        CastKind::PipeWire => "PipeWire",
+        CastKind::WlrScreencopy => "wlr-screencopy",
+    };
+    println!("  Kind: {kind}");
+
     match &cast.target {
         CastTarget::Nothing {} => {
             println!("  Target: nothing (cleared)");

src/ipc/server.rs

@@ -825,6 +825,7 @@ impl State {
                     let cast = niri_ipc::Cast {
                         session_id: pending.session_id.get(),
                         stream_id,
+                        kind: niri_ipc::CastKind::PipeWire,
                         target: niri_ipc::CastTarget::Nothing {},
                         is_dynamic_target: true,
                         is_active: false,
@@ -845,6 +846,7 @@ impl State {
                     let cast = niri_ipc::Cast {
                         session_id: cast.session_id.get(),
                         stream_id,
+                        kind: niri_ipc::CastKind::PipeWire,
                         target: cast.target.make_ipc(),
                         is_dynamic_target: cast.dynamic_target,
                         is_active: cast.is_active(),
@@ -870,6 +872,7 @@ impl State {
                     let cast = niri_ipc::Cast {
                         session_id: cast_info.session_id.get(),
                         stream_id,
+                        kind: niri_ipc::CastKind::WlrScreencopy,
                         target: niri_ipc::CastTarget::Output {
                             name: cast_info.output_name.clone(),
                         },