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 65 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;
 
+    void setNearestNeighbor(bool nearestNeighbor) { m_surface->setNearestNeighbor(nearestNeighbor); }

[Justin Novosad, 2014/09/10 14:28:31]

You should use an enum rather than a bool. Something like
SkBitmapScaler::ResizeMethod would be a lot more general and will avoid having
to refactor this code if we ever need to support additional filtering modes
(possibly for completely different layer use cases).

[Stephen White, 2014/09/10 15:37:09]

Good point, but I don't think we should expose Skia types outside platform/.
Perhaps something like InterpolationQuality (in GraphicsTypes.h)?

[jackhou1, 2014/09/11 08:26:31]

Used SkPaint::FilterLevel as that's what InterpolationQuality maps to.

     void setIsHidden(bool hidden) { m_surface->setIsHidden(hidden); }
 
     GraphicsContext* context() const;
 
     // Called at the end of a task that rendered a whole frame
     void finalizeFrame(const FloatRect &dirtyRect);
     void didFinalizeFrame();
 
     bool isDirty();
 
@@ skipping 52 matching lines @@
 
     IntSize m_size;
     RefPtr<Uint8ClampedArray> m_data;
 };
 
 String PLATFORM_EXPORT ImageDataToDataURL(const ImageDataBuffer&, const String& mimeType, const double* quality);
 
 } // namespace blink
 
 #endif // ImageBuffer_h