head-management: add format-info-v1 extension

src/compositor.rs

@@ -656,6 +656,7 @@ fn create_dummy_output(state: &Rc<State>) {
         vrr: false,
         tearing_enabled: backend_state.tearing,
         tearing_active: false,
+        format: XRGB8888,
     };
     let connector_data = Rc::new(ConnectorData {
         id,

src/ifs/head_management.rs

@@ -2,6 +2,7 @@ use {
     crate::{
         backend::{ConnectorId, Mode, MonitorInfo, transaction::BackendConnectorTransactionError},
         client::ClientId,
+        format::Format,
         globals::GlobalName,
         ifs::head_management::{
             head_management_macros::HeadExts, jay_head_manager_session_v1::JayHeadManagerSessionV1,
@@ -82,6 +83,7 @@ pub struct HeadState {
     pub vrr: bool,
     pub tearing_enabled: bool,
     pub tearing_active: bool,
+    pub format: &'static Format,
 }
 
 impl HeadState {
@@ -406,4 +408,16 @@ impl HeadManagers {
             }
         }
     }
+
+    pub fn handle_format_change(&self, format: &'static Format) {
+        let state = &mut *self.state.borrow_mut();
+        state.format = format;
+        for head in self.managers.lock().values() {
+            skip_in_transaction!(head);
+            if let Some(ext) = &head.ext.format_info_v1 {
+                ext.send_format(state);
+                head.session.schedule_done();
+            }
+        }
+    }
 }

src/ifs/head_management/head_management_macros.rs

@@ -401,4 +401,5 @@ declare_extensions! {
     non_desktop_info_v1: NonDesktopInfoV1,
     vrr_state_v1: VrrStateV1,
     tearing_state_v1: TearingStateV1,
+    format_info_v1: FormatInfoV1,
 }

src/ifs/head_management/jay_head_ext.rs

@@ -5,6 +5,7 @@ pub(super) mod jay_head_ext_compositor_space_scaler_v1;
 pub(super) mod jay_head_ext_compositor_space_transformer_v1;
 pub(super) mod jay_head_ext_connector_info_v1;
 pub(super) mod jay_head_ext_core_info_v1;
+pub(super) mod jay_head_ext_format_info_v1;
 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;

src/ifs/head_management/jay_head_ext/jay_head_ext_format_info_v1.rs

@@ -0,0 +1,49 @@
+use {
+    crate::{
+        ifs::head_management::HeadState,
+        wire::{
+            jay_head_ext_format_info_v1::{Format, JayHeadExtFormatInfoV1RequestHandler},
+            jay_head_manager_ext_format_info_v1::JayHeadManagerExtFormatInfoV1RequestHandler,
+        },
+    },
+    std::rc::Rc,
+};
+
+impl_format_info_v1! {
+    version = 1,
+    after_announce = after_announce,
+    after_transaction = after_transaction,
+}
+
+impl HeadName {
+    fn after_announce(&self, shared: &HeadState) {
+        self.send_format(shared);
+    }
+
+    fn after_transaction(&self, shared: &HeadState, tran: &HeadState) {
+        if shared.format != tran.format {
+            self.send_format(shared);
+        }
+    }
+
+    pub(in super::super) fn send_format(&self, state: &HeadState) {
+        self.client.event(Format {
+            self_id: self.id,
+            format: state.format.drm,
+        });
+    }
+}
+
+impl JayHeadManagerExtFormatInfoV1RequestHandler for MgrName {
+    type Error = ErrorName;
+
+    mgr_common_req!();
+}
+
+impl JayHeadExtFormatInfoV1RequestHandler for HeadName {
+    type Error = ErrorName;
+
+    head_common_req!();
+}
+
+error!();

src/state.rs

@@ -459,6 +459,9 @@ impl ConnectorData {
         if old.tearing != s.tearing {
             self.head_managers.handle_tearing_enabled_change(s.tearing);
         }
+        if old.format != s.format {
+            self.head_managers.handle_format_change(s.format);
+        }
         if let Some(output) = state.outputs.get(&self.connector.id())
             && let Some(node) = &output.node
         {

src/tasks/connector.rs

@@ -62,6 +62,7 @@ pub fn handle(state: &Rc<State>, connector: &Rc<dyn Connector>) {
         vrr: backend_state.vrr,
         tearing_enabled: backend_state.tearing,
         tearing_active: false,
+        format: backend_state.format,
     };
     let data = Rc::new(ConnectorData {
         id,