Partial swap implementation for surfaceless

content/browser/compositor/buffer_queue.h

Index: content/browser/compositor/buffer_queue.h
diff --git a/content/browser/compositor/buffer_queue.h b/content/browser/compositor/buffer_queue.h
index 2b6185cadcceb5b2b2d1561c9ad45ef9ca168ed1..85ef949ed7fdad3d0fb097ccf5be3fe7639abf81 100644
--- a/content/browser/compositor/buffer_queue.h
+++ b/content/browser/compositor/buffer_queue.h
@@ -9,7 +9,9 @@
 #include <vector>
 
 #include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
 #include "content/common/content_export.h"
+#include "ui/gfx/rect.h"
 #include "ui/gfx/size.h"
 
 namespace cc {
@@ -26,12 +28,12 @@ class CONTENT_EXPORT BufferQueue {
  public:
   BufferQueue(scoped_refptr<cc::ContextProvider> context_provider,
               unsigned int internalformat);
-  ~BufferQueue();
+  virtual ~BufferQueue();
 
   bool Initialize();
 
   void BindFramebuffer();
-  void SwapBuffers();
+  void SwapBuffers(const gfx::Rect& damage);
   void PageFlipComplete();
   void Reshape(const gfx::Size& size, float scale_factor);
 
@@ -39,18 +41,31 @@ class CONTENT_EXPORT BufferQueue {
 
  private:
   friend class BufferQueueTest;
+
   struct AllocatedSurface {
     AllocatedSurface() : texture(0), image(0) {}
-    AllocatedSurface(unsigned int texture, unsigned int image)
-        : texture(texture), image(image) {}
+    AllocatedSurface(unsigned int texture,
+                     unsigned int image,
+                     const gfx::Rect& rect)
+        : texture(texture), image(image), damage(rect) {}
     unsigned int texture;
     unsigned int image;
+    gfx::Rect damage;  // This is the damage for this frame from the previous.
   };
 
   void FreeAllSurfaces();
 
   void FreeSurface(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.
   AllocatedSurface GetNextSurface();
 
@@ -61,7 +76,7 @@ class CONTENT_EXPORT BufferQueue {
   unsigned int internalformat_;
   AllocatedSurface current_surface_;  // This surface is currently bound.
   std::vector<AllocatedSurface> available_surfaces_;  // These are free for use.
-  std::queue<AllocatedSurface> in_flight_surfaces_;
+  std::deque<AllocatedSurface> in_flight_surfaces_;
 
   DISALLOW_COPY_AND_ASSIGN(BufferQueue);
 };