[cc] Mailbox Output Surface Support

cc/output_surface.h

 // Copyright 2012 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 CC_OUTPUT_SURFACE_H_
 #define CC_OUTPUT_SURFACE_H_
 
 #define USE_CC_OUTPUT_SURFACE // TODO(danakj): Remove this.
 
 #include "base/memory/scoped_ptr.h"
 #include "cc/cc_export.h"
 #include "cc/software_output_device.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebCompositorOutputSurface.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebGraphicsContext3D.h"
 
+namespace gfx {
+class Rect;
+class Size;
+}
+
 namespace cc {
 
 class CompositorFrame;
 class OutputSurfaceClient;
 
 // Represents the output surface for a compositor. The compositor owns
 // and manages its destruction. Its lifetime is:
 //   1. Created on the main thread by the LayerTreeHost through its client.
 //   2. Passed to the compositor thread and bound to a client via BindToClient.
 //      From here on, it will only be used on the compositor thread.
@@ skipping 37 matching lines @@
   // thread-specific data for the output surface can be initialized, since from
   // this point on the output surface will only be used on the compositor
   // thread.
   virtual bool BindToClient(OutputSurfaceClient*);
 
   // Sends frame data to the parent compositor. This should only be called when
   // capabilities().has_parent_compositor. The implementation may destroy or
   // steal the contents of the CompositorFrame passed in.
   virtual void SendFrameToParentCompositor(CompositorFrame*);
 
+  virtual void EnsureBackbuffer();
+  virtual void DiscardBackbuffer();
+
+  virtual void Reshape(const gfx::Size& size);

[danakj, 2013/02/28 03:57:44]

nit: pass Size/Point/Rect/Vector2d/SizeF/PointF by value

[no sievers, 2013/02/28 18:43:40]

Done.

+
+  virtual void BindFramebuffer();
+
+  virtual void PostSubBuffer(const gfx::Rect& rect);

[danakj, 2013/02/28 03:57:44]

nit: by value

[no sievers, 2013/02/28 18:43:40]

Done.

+  virtual void SwapBuffers();
+
   // Notifies frame-rate smoothness preference. If true, all non-critical
   // processing should be stopped, or lowered in priority.
   virtual void UpdateSmoothnessTakesPriority(bool prefer_smoothness) {}
 
  protected:
   OutputSurfaceClient* client_;
   struct cc::OutputSurface::Capabilities capabilities_;
   scoped_ptr<WebKit::WebGraphicsContext3D> context3d_;
   scoped_ptr<cc::SoftwareOutputDevice> software_device_;
+  bool  has_gl_discard_backbuffer_;

[danakj, 2013/02/28 03:57:44]

nit: extra space

[no sievers, 2013/02/28 18:43:40]

Done.

 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_SURFACE_H_