Reduce the number of calls to the embedder by grouping the screen and window coordinates into one structure

components/compositing/windowing.rs

@@ -121,19 +121,11 @@ pub enum AnimationState {
 }
 
 pub trait WindowMethods {
-    /// Returns the rendering area size in hardware pixels.
-    fn framebuffer_size(&self) -> DeviceUintSize;
-    /// Returns the position and size of the window within the rendering area.
-    fn window_rect(&self) -> DeviceUintRect;
     /// Presents the window to the screen (perhaps by page flipping).
     fn present(&self);
 
-    /// Return the size of the window with head and borders and position of the window values
-    fn client_window(&self, ctx: TopLevelBrowsingContextId) -> (DeviceUintSize, DeviceIntPoint);
-    /// Return the size of the screen.
-    fn screen_size(&self, ctx: TopLevelBrowsingContextId) -> DeviceUintSize;
-    /// Return the available size of the screen.
-    fn screen_avail_size(&self, ctx: TopLevelBrowsingContextId) -> DeviceUintSize;
+    /// Get the coordinates of the native window, the screen and the framebuffer.
+    fn get_coordinates(&self) -> EmbedderCoordinates;
     /// Set the size inside of borders and head
     fn set_inner_size(&self, ctx: TopLevelBrowsingContextId, size: DeviceUintSize);
     /// Set the window position
@@ -158,9 +150,6 @@ pub trait WindowMethods {
     /// Called when the history state has changed.
     fn history_changed(&self, ctx: TopLevelBrowsingContextId, Vec<LoadData>, usize);
 
-    /// Returns the scale factor of the system (device pixels / device independent pixels).
-    fn hidpi_factor(&self) -> TypedScale<f32, DeviceIndependentPixel, DevicePixel>;
-
     /// Returns a thread-safe object to wake up the window's event loop.
     fn create_event_loop_waker(&self) -> Box<EventLoopWaker>;
 
@@ -193,3 +182,19 @@ pub trait WindowMethods {
     /// Called when a pipeline panics.
     fn handle_panic(&self, browser_id: TopLevelBrowsingContextId, reason: String, backtrace: Option<String>);
 }
+
+#[derive(Clone, Copy, Debug)]
+pub struct EmbedderCoordinates {
+    /// The pixel density of the display.
+    pub hidpi_factor: TypedScale<f32, DeviceIndependentPixel, DevicePixel>,
+    /// Size of the screen.
+    pub screen: DeviceUintSize,
+    /// Size of the available screen space (screen without toolbars and docks).
+    pub screen_avail: DeviceUintSize,
+    /// Size of the native window.
+    pub window: (DeviceUintSize, DeviceIntPoint),
+    /// Size of the GL buffer in the window.
+    pub framebuffer: DeviceUintSize,
+    /// Coordinates of the document within the framebuffer.
+    pub viewport: DeviceUintRect,
+}