ash: Low-latency laser pointer.

ash/laser/laser_pointer_view.h

Index: ash/laser/laser_pointer_view.h
diff --git a/ash/laser/laser_pointer_view.h b/ash/laser/laser_pointer_view.h
index 11acfcb93db2053a8ff3db30322126126ba17d97..97d281b0d510e56b51378cb2462d2a09076f587d 100644
--- a/ash/laser/laser_pointer_view.h
+++ b/ash/laser/laser_pointer_view.h
@@ -5,10 +5,20 @@
 #ifndef ASH_LASER_LASER_POINTER_VIEW_H_
 #define ASH_LASER_LASER_POINTER_VIEW_H_
 
+#include <deque>
 #include <memory>
+#include <unordered_map>
 
 #include "ash/laser/laser_pointer_points.h"
 #include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+#include "cc/ipc/compositor_frame.mojom.h"
+#include "cc/ipc/mojo_compositor_frame_sink.mojom.h"
+#include "cc/resources/texture_mailbox.h"
+#include "cc/surfaces/compositor_frame_sink_support.h"
+#include "cc/surfaces/compositor_frame_sink_support_client.h"
+#include "cc/surfaces/local_surface_id_allocator.h"
+#include "mojo/public/cpp/bindings/strong_binding.h"
 #include "ui/views/view.h"
 
 namespace aura {
@@ -16,6 +26,7 @@ class Window;
 }
 
 namespace gfx {
+class GpuMemoryBuffer;
 class Point;
 }
 
@@ -24,11 +35,14 @@ class Widget;
 }
 
 namespace ash {
+struct LaserResource;
 
 // LaserPointerView displays the palette tool laser pointer. It draws the laser,
 // which consists of a point where the mouse cursor should be, as well as a
 // trail of lines to help users track.
-class LaserPointerView : public views::View {
+class LaserPointerView : public views::View,
+                         public cc::mojom::MojoCompositorFrameSink,
+                         public cc::CompositorFrameSinkSupportClient {
  public:
   LaserPointerView(base::TimeDelta life_duration, aura::Window* root_window);
   ~LaserPointerView() override;
@@ -37,16 +51,46 @@ class LaserPointerView : public views::View {
   void UpdateTime();
   void Stop();
 
+  // Overridden from cc::mojom::MojoCompositorFrameSink:
+  void SetNeedsBeginFrame(bool needs_begin_frame) override;
+  void SubmitCompositorFrame(const cc::LocalSurfaceId& local_surface_id,
+                             cc::CompositorFrame frame) override;
+  void EvictFrame() override;
+
+  // Overridden from cc::CompositorFrameSinkSupportClient:
+  void DidReceiveCompositorFrameAck() override;
+  void OnBeginFrame(const cc::BeginFrameArgs& args) override {}
+  void ReclaimResources(const cc::ReturnedResourceArray& resources) override;
+  void WillDrawSurface(const cc::LocalSurfaceId& local_surface_id,
+                       const gfx::Rect& damage_rect) override {}
+
  private:
   friend class LaserPointerControllerTestApi;
 
-  // view::View:
-  void OnPaint(gfx::Canvas* canvas) override;
-
+  gfx::Rect GetBoundingBox();
   void OnPointsUpdated();
+  void UpdateBuffer();
+  void OnBufferUpdated();
+  void UpdateSurface();
+  void OnDidDrawSurface();
 
   LaserPointerPoints laser_points_;
   std::unique_ptr<views::Widget> widget_;
+  float scale_factor_ = 1.0f;
+  std::unique_ptr<gfx::GpuMemoryBuffer> gpu_memory_buffer_;
+  gfx::Rect buffer_damage_rect_;
+  bool pending_update_buffer_ = false;
+  gfx::Rect surface_damage_rect_;
+  bool needs_update_surface_ = false;
+  bool pending_draw_surface_ = false;
+  const cc::FrameSinkId frame_sink_id_;
+  cc::CompositorFrameSinkSupport frame_sink_support_;
+  cc::LocalSurfaceId local_surface_id_;
+  cc::LocalSurfaceIdAllocator id_allocator_;
+  int next_resource_id_ = 1;
+  std::unordered_map<int, std::unique_ptr<LaserResource>> resources_;
+  std::deque<std::unique_ptr<LaserResource>> returned_resources_;
+  base::WeakPtrFactory<LaserPointerView> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(LaserPointerView);
 };