Implement InterpolationMedium to filter animated images

Source/core/rendering/RenderHTMLCanvas.cpp

 /*
  * Copyright (C) 2004, 2006, 2007 Apple Inc. 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 55 matching lines @@
     LayoutRect paintRect = replacedContentRect();
     paintRect.moveBy(paintOffset);
 
     bool clip = !contentRect.contains(paintRect);
     if (clip) {
         // Not allowed to overflow the content box.
         paintInfo.context->save();
         paintInfo.context->clip(pixelSnappedIntRect(contentRect));
     }
 
+    // FIXME: InterpolationNone should be used if ImageRenderingOptimizeContrast is set.

[Stephen White, 2014/03/18 17:26:43]

Please log a bug for this, if there isn't one already.

[Alpha Left Google, 2014/03/18 22:59:13]

Done.

     bool useLowQualityScale = style()->imageRendering() == ImageRenderingOptimizeContrast;
-    toHTMLCanvasElement(node())->paint(context, paintRect, useLowQualityScale);
+    toHTMLCanvasElement(node())->paint(context, paintRect, useLowQualityScale ? InterpolationLow : DefaultInterpolationQuality);
 
     if (clip)
         context->restore();
 }
 
 void RenderHTMLCanvas::canvasSizeChanged()
 {
     IntSize canvasSize = toHTMLCanvasElement(node())->size();
     LayoutSize zoomedSize(canvasSize.width() * style()->effectiveZoom(), canvasSize.height() * style()->effectiveZoom());
 
@@ skipping 12 matching lines @@
     updateLogicalWidth();
     updateLogicalHeight();
     if (oldSize == size())
         return;
 
     if (!selfNeedsLayout())
         setNeedsLayout();
 }
 
 } // namespace WebCore