Improving canvas 2D performance by switching graphics rendering pipeline.

third_party/WebKit/Source/platform/graphics/ImageBuffer.h

 /*
  * Copyright (C) 2006 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 128 matching lines @@
 
     PassRefPtr<SkPicture> getPicture() { return m_surface->getPicture(); }
 
     void draw(GraphicsContext&, const FloatRect&, const FloatRect*, SkXfermode::Mode);
 
     void updateGPUMemoryUsage() const;
     static intptr_t getGlobalGPUMemoryUsage() { return s_globalGPUMemoryUsage; }
     static unsigned getGlobalAcceleratedImageBufferCount() { return s_globalAcceleratedImageBufferCount; }
     intptr_t getGPUMemoryUsage() { return m_gpuMemoryUsage; }
 
+    void disableAcceleration();
+
+    WeakPtrFactory<ImageBuffer> m_weakPtrFactory;
+
 protected:
     ImageBuffer(std::unique_ptr<ImageBufferSurface>);
 
 private:
     enum SnapshotState {
         InitialSnapshotState,
         DidAcquireSnapshot,
         DrawnToAfterSnapshot,
     };
     mutable SnapshotState m_snapshotState;
@@ skipping 15 matching lines @@
     int height() const { return m_size.height(); }
     int width() const { return m_size.width(); }
 
     const unsigned char* m_data;
     const IntSize m_size;
 };
 
 } // namespace blink
 
 #endif // ImageBuffer_h