head-management: add tearing-state-v1 extension

src/compositor.rs

@@ -654,6 +654,8 @@ fn create_dummy_output(state: &Rc<State>) {
         inherent_non_desktop: false,
         override_non_desktop: None,
         vrr: false,
+        tearing_enabled: backend_state.tearing,
+        tearing_active: false,
     };
     let connector_data = Rc::new(ConnectorData {
         id,
@@ -727,6 +729,7 @@ fn create_dummy_output(state: &Rc<State>) {
         tray_items: Default::default(),
         ext_workspace_groups: Default::default(),
         pinned: Default::default(),
+        tearing: Default::default(),
     });
     let dummy_workspace = Rc::new(WorkspaceNode {
         id: state.node_ids.next(),

src/ifs/head_management.rs

@@ -80,6 +80,8 @@ pub struct HeadState {
     pub inherent_non_desktop: bool,
     pub override_non_desktop: Option<bool>,
     pub vrr: bool,
+    pub tearing_enabled: bool,
+    pub tearing_active: bool,
 }
 
 impl HeadState {
@@ -380,4 +382,28 @@ impl HeadManagers {
             }
         }
     }
+
+    pub fn handle_tearing_enabled_change(&self, enabled: bool) {
+        let state = &mut *self.state.borrow_mut();
+        state.tearing_enabled = enabled;
+        for head in self.managers.lock().values() {
+            skip_in_transaction!(head);
+            if let Some(ext) = &head.ext.tearing_state_v1 {
+                ext.send_enabled(state);
+                head.session.schedule_done();
+            }
+        }
+    }
+
+    pub fn handle_tearing_active_change(&self, active: bool) {
+        let state = &mut *self.state.borrow_mut();
+        state.tearing_active = active;
+        for head in self.managers.lock().values() {
+            skip_in_transaction!(head);
+            if let Some(ext) = &head.ext.tearing_state_v1 {
+                ext.send_active(state);
+                head.session.schedule_done();
+            }
+        }
+    }
 }

src/ifs/head_management/head_management_macros.rs

@@ -400,4 +400,5 @@ declare_extensions! {
     physical_display_info_v1: PhysicalDisplayInfoV1,
     non_desktop_info_v1: NonDesktopInfoV1,
     vrr_state_v1: VrrStateV1,
+    tearing_state_v1: TearingStateV1,
 }

src/ifs/head_management/jay_head_ext.rs

@@ -9,4 +9,5 @@ pub(super) mod jay_head_ext_mode_info_v1;
 pub(super) mod jay_head_ext_mode_setter_v1;
 pub(super) mod jay_head_ext_non_desktop_info_v1;
 pub(super) mod jay_head_ext_physical_display_info_v1;
+pub(super) mod jay_head_ext_tearing_state_v1;
 pub(super) mod jay_head_ext_vrr_state_v1;

src/ifs/head_management/jay_head_ext/jay_head_ext_tearing_state_v1.rs

@@ -0,0 +1,64 @@
+use {
+    crate::{
+        ifs::head_management::HeadState,
+        wire::{
+            jay_head_ext_tearing_state_v1::{
+                Active, Disabled, Enabled, Inactive, JayHeadExtTearingStateV1RequestHandler,
+            },
+            jay_head_manager_ext_tearing_state_v1::JayHeadManagerExtTearingStateV1RequestHandler,
+        },
+    },
+    std::rc::Rc,
+};
+
+impl_tearing_state_v1! {
+    version = 1,
+    after_announce = after_announce,
+    after_transaction = after_transaction,
+}
+
+impl HeadName {
+    fn after_announce(&self, shared: &HeadState) {
+        self.send_enabled(shared);
+        self.send_active(shared);
+    }
+
+    fn after_transaction(&self, shared: &HeadState, tran: &HeadState) {
+        if shared.tearing_enabled != tran.tearing_enabled {
+            self.send_enabled(shared);
+        }
+        if shared.tearing_active != tran.tearing_active {
+            self.send_active(shared);
+        }
+    }
+
+    pub(in super::super) fn send_enabled(&self, state: &HeadState) {
+        if state.tearing_enabled {
+            self.client.event(Enabled { self_id: self.id });
+        } else {
+            self.client.event(Disabled { self_id: self.id });
+        }
+    }
+
+    pub(in super::super) fn send_active(&self, state: &HeadState) {
+        if state.tearing_active {
+            self.client.event(Active { self_id: self.id });
+        } else {
+            self.client.event(Inactive { self_id: self.id });
+        }
+    }
+}
+
+impl JayHeadManagerExtTearingStateV1RequestHandler for MgrName {
+    type Error = ErrorName;
+
+    mgr_common_req!();
+}
+
+impl JayHeadExtTearingStateV1RequestHandler for HeadName {
+    type Error = ErrorName;
+
+    head_common_req!();
+}
+
+error!();

src/state.rs

@@ -456,6 +456,9 @@ impl ConnectorData {
         if old.vrr != s.vrr {
             self.head_managers.handle_vrr_change(s.vrr);
         }
+        if old.tearing != s.tearing {
+            self.head_managers.handle_tearing_enabled_change(s.tearing);
+        }
         if let Some(output) = state.outputs.get(&self.connector.id())
             && let Some(node) = &output.node
         {

src/tasks/connector.rs

@@ -60,6 +60,8 @@ pub fn handle(state: &Rc<State>, connector: &Rc<dyn Connector>) {
         inherent_non_desktop: false,
         override_non_desktop: backend_state.non_desktop_override,
         vrr: backend_state.vrr,
+        tearing_enabled: backend_state.tearing,
+        tearing_active: false,
     };
     let data = Rc::new(ConnectorData {
         id,
@@ -240,6 +242,7 @@ impl ConnectorHandler {
             tray_items: Default::default(),
             ext_workspace_groups: Default::default(),
             pinned: Default::default(),
+            tearing: Default::default(),
         });
         on.update_visible();
         on.update_rects();

src/tree/output.rs

@@ -32,6 +32,7 @@ use {
                 ext_workspace_manager_v1::WorkspaceManagerId,
             },
             wp_content_type_v1::ContentType,
+            wp_presentation_feedback::KIND_VSYNC,
             zwlr_layer_shell_v1::{BACKGROUND, BOTTOM, OVERLAY, TOP},
             zwlr_screencopy_frame_v1::ZwlrScreencopyFrameV1,
         },
@@ -47,10 +48,10 @@ use {
             WorkspaceNodeId, walker::NodeVisitor,
         },
         utils::{
-            asyncevent::AsyncEvent, clonecell::CloneCell, copyhashmap::CopyHashMap,
-            errorfmt::ErrorFmt, event_listener::EventSource, hash_map_ext::HashMapExt,
-            linkedlist::LinkedList, on_drop_event::OnDropEvent, scroller::Scroller,
-            transform_ext::TransformExt,
+            asyncevent::AsyncEvent, bitflags::BitflagsExt, clonecell::CloneCell,
+            copyhashmap::CopyHashMap, errorfmt::ErrorFmt, event_listener::EventSource,
+            hash_map_ext::HashMapExt, linkedlist::LinkedList, on_drop_event::OnDropEvent,
+            scroller::Scroller, transform_ext::TransformExt,
         },
         wire::{
             ExtImageCopyCaptureSessionV1Id, JayOutputId, JayScreencastId, ZwlrScreencopyFrameV1Id,
@@ -107,6 +108,7 @@ pub struct OutputNode {
     pub tray_items: LinkedList<Rc<dyn DynTrayItem>>,
     pub ext_workspace_groups: CopyHashMap<WorkspaceManagerId, Rc<ExtWorkspaceGroupHandleV1>>,
     pub pinned: LinkedList<Rc<dyn PinnedNode>>,
+    pub tearing: Cell<bool>,
 }
 
 #[derive(Copy, Clone, Debug, PartialEq)]
@@ -218,6 +220,13 @@ impl OutputNode {
         if locked && let Some(lock) = self.state.lock.lock.get() {
             lock.check_locked()
         }
+        let tearing = flags.not_contains(KIND_VSYNC);
+        if self.tearing.replace(tearing) != tearing {
+            self.global
+                .connector
+                .head_managers
+                .handle_tearing_active_change(tearing);
+        }
     }
 
     pub fn update_exclusive_zones(self: &Rc<Self>) {