cc: Implement overdraw feedback debugging feature.

components/display_compositor/buffer_queue.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_DISPLAY_COMPOSITOR_BUFFER_QUEUE_H_
 #define COMPONENTS_DISPLAY_COMPOSITOR_BUFFER_QUEUE_H_
 
 #include <stddef.h>
 
 #include <deque>
@@ skipping 40 matching lines @@
               gpu::SurfaceHandle surface_handle);
   virtual ~BufferQueue();
 
   void Initialize();
 
   void BindFramebuffer();
   void SwapBuffers(const gfx::Rect& damage);
   void PageFlipComplete();
   void Reshape(const gfx::Size& size,
                float scale_factor,
-               const gfx::ColorSpace& color_space);
+               const gfx::ColorSpace& color_space,
+               bool use_stencil);
 
   void RecreateBuffers();
 
   uint32_t current_texture_id() const {
     return current_surface_ ? current_surface_->texture : 0;
   }
   uint32_t fbo() const { return fbo_; }
   uint32_t internal_format() const { return internal_format_; }
 
  private:
   friend class BufferQueueTest;
   friend class AllocatedSurface;
 
   struct DISPLAY_COMPOSITOR_EXPORT AllocatedSurface {
     AllocatedSurface(BufferQueue* buffer_queue,
                      std::unique_ptr<gfx::GpuMemoryBuffer> buffer,
                      uint32_t texture,
                      uint32_t image,
+                     uint32_t stencil,
                      const gfx::Rect& rect);
     ~AllocatedSurface();
     BufferQueue* const buffer_queue;
     std::unique_ptr<gfx::GpuMemoryBuffer> buffer;
     const uint32_t texture;
     const uint32_t image;
+    const uint32_t stencil;
     gfx::Rect damage;  // This is the damage for this frame from the previous.
   };
 
   void FreeAllSurfaces();
 
   void FreeSurfaceResources(AllocatedSurface* surface);
 
   // Copy everything that is in |copy_rect|, except for what is in
   // |exclude_rect| from |source_texture| to |texture|.
   virtual void CopyBufferDamage(int texture,
                                 int source_texture,
                                 const gfx::Rect& new_damage,
                                 const gfx::Rect& old_damage);
 
   void UpdateBufferDamage(const gfx::Rect& damage);
 
   // Return a surface, available to be drawn into.
   std::unique_ptr<AllocatedSurface> GetNextSurface();
 
   std::unique_ptr<AllocatedSurface> RecreateBuffer(
       std::unique_ptr<AllocatedSurface> surface);
 
   gpu::gles2::GLES2Interface* const gl_;
   gfx::Size size_;
   gfx::ColorSpace color_space_;
+  bool use_stencil_ = false;
   uint32_t fbo_;
   size_t allocated_count_;
   uint32_t texture_target_;
   uint32_t internal_format_;
   gfx::BufferFormat format_;
   // This surface is currently bound. This may be nullptr if no surface has
   // been bound, or if allocation failed at bind.
   std::unique_ptr<AllocatedSurface> current_surface_;
   // The surface currently on the screen, if any.
   std::unique_ptr<AllocatedSurface> displayed_surface_;
   // These are free for use, and are not nullptr.
   std::vector<std::unique_ptr<AllocatedSurface>> available_surfaces_;
   // These have been swapped but are not displayed yet. Entries of this deque
   // may be nullptr, if they represent frames that have been destroyed.
   std::deque<std::unique_ptr<AllocatedSurface>> in_flight_surfaces_;
   GLHelper* gl_helper_;
   gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager_;
   gpu::SurfaceHandle surface_handle_;
 
   DISALLOW_COPY_AND_ASSIGN(BufferQueue);
 };
 
 }  // namespace display_compositor
 
 #endif  // COMPONENTS_DISPLAY_COMPOSITOR_BUFFER_QUEUE_H_