Implement image-rendering:pixelated for accelerated 2D canvases.

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 19 matching lines @@
 
 #include "platform/PlatformExport.h"
 #include "platform/geometry/FloatRect.h"
 #include "platform/geometry/IntSize.h"
 #include "platform/graphics/Canvas2DLayerBridge.h"
 #include "platform/graphics/ColorSpace.h"
 #include "platform/graphics/GraphicsTypes.h"
 #include "platform/graphics/GraphicsTypes3D.h"
 #include "platform/graphics/ImageBufferSurface.h"
 #include "platform/transforms/AffineTransform.h"
+#include "third_party/skia/include/core/SkPaint.h"
 #include "wtf/Forward.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/PassRefPtr.h"
 
 namespace WTF {
 
 class ArrayBufferContents;
 
 } // namespace WTF
@@ skipping 32 matching lines @@
     ~ImageBuffer();
 
     void setClient(ImageBufferClient* client) { m_client = client; }
 
     const IntSize& size() const { return m_surface->size(); }
     bool isAccelerated() const { return m_surface->isAccelerated(); }
     bool isSurfaceValid() const;
     bool restoreSurface() const;
     bool needsClipTracking() const { return m_surface->needsClipTracking(); }
 
+    void setFilterLevel(SkPaint::FilterLevel filterLevel) { m_surface->setFilterLevel(filterLevel); }
     void setIsHidden(bool hidden) { m_surface->setIsHidden(hidden); }
 
     // Called by subclasses of ImageBufferSurface to install a new canvas object
     void resetCanvas(SkCanvas*);
 
     void willDrawVideo() { m_surface->willDrawVideo(); }
 
     GraphicsContext* context() const;
 
     // Called at the end of a task that rendered a whole frame
     void finalizeFrame(const FloatRect &dirtyRect);
     void didFinalizeFrame();
 
     bool isDirty();
 
     const SkBitmap& bitmap() const;
 
+    void willAccessPixels() { m_surface->willAccessPixels(); }
+
     PassRefPtr<Image> copyImage(BackingStoreCopy = CopyBackingStore, ScaleBehavior = Scaled) const;
     // Give hints on the faster copyImage Mode, return DontCopyBackingStore if it supports the DontCopyBackingStore behavior
     // or return CopyBackingStore if it doesn't.
     static BackingStoreCopy fastCopyImageMode();
 
     bool getImageData(Multiply, const IntRect&, WTF::ArrayBufferContents&) const;
 
     void putByteArray(Multiply, const unsigned char* source, const IntSize& sourceSize, const IntRect& sourceRect, const IntPoint& destPoint);
 
     String toDataURL(const String& mimeType, const double* quality = 0) const;
@@ skipping 31 matching lines @@
     friend class SkiaImageFilterBuilder;
 
     OwnPtr<ImageBufferSurface> m_surface;
     OwnPtr<GraphicsContext> m_context;
     ImageBufferClient* m_client;
 };
 
 } // namespace blink
 
 #endif // ImageBuffer_h