Implement InterpolationMedium to filter animated images

Source/core/html/HTMLCanvasElement.h

 /*
  * Copyright (C) 2004, 2006, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  * 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 15 matching lines @@
  */
 
 #ifndef HTMLCanvasElement_h
 #define HTMLCanvasElement_h
 
 #include "core/html/HTMLElement.h"
 #include "core/html/canvas/CanvasImageSource.h"
 #include "platform/geometry/FloatRect.h"
 #include "platform/geometry/IntSize.h"
 #include "platform/graphics/Canvas2DLayerBridge.h"
+#include "platform/graphics/GraphicsTypes.h"
 #include "wtf/Forward.h"
 
-#define DefaultInterpolationQuality InterpolationMedium
+#define DefaultInterpolationQuality InterpolationLow
 
 namespace WebCore {
 
 class AffineTransform;
 class CanvasContextAttributes;
 class CanvasRenderingContext;
 class GraphicsContext;
 class GraphicsContextStateSaver;
 class HTMLCanvasElement;
 class Image;
@@ skipping 44 matching lines @@
     CanvasRenderingContext* getContext(const String&, CanvasContextAttributes* attributes = 0);
 
     static String toEncodingMimeType(const String& mimeType);
     String toDataURL(const String& mimeType, const double* quality, ExceptionState&);
     String toDataURL(const String& mimeType, ExceptionState& exceptionState) { return toDataURL(mimeType, 0, exceptionState); }
 
     // Used for rendering
     void didDraw(const FloatRect&);
     void notifyObserversCanvasChanged(const FloatRect&);
 
-    void paint(GraphicsContext*, const LayoutRect&, bool useLowQualityScale = false);
+    void paint(GraphicsContext*, const LayoutRect&, InterpolationQuality = InterpolationDefault);
 
     GraphicsContext* drawingContext() const;
     GraphicsContext* existingDrawingContext() const;
 
     CanvasRenderingContext* renderingContext() const { return m_context.get(); }
 
     void ensureUnacceleratedImageBuffer();
     ImageBuffer* buffer() const;
     Image* copiedImage() const;
     void clearCopiedImage();
@@ skipping 69 matching lines @@
     OwnPtr<ImageBuffer> m_imageBuffer;
     mutable OwnPtr<GraphicsContextStateSaver> m_contextStateSaver;
 
     mutable RefPtr<Image> m_presentedImage;
     mutable RefPtr<Image> m_copiedImage; // FIXME: This is temporary for platforms that have to copy the image buffer to render (and for CSSCanvasValue).
 };
 
 } //namespace
 
 #endif