Implement InterpolationMedium to filter animated images

Source/core/html/HTMLCanvasElement.cpp

 /*
  * Copyright (C) 2004, 2006, 2007 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 285 matching lines @@
     if (!m_context->isAccelerated())
         return true;
 
     if (renderBox() && renderBox()->hasAcceleratedCompositing())
         return false;
 
     return true;
 }
 
 
-void HTMLCanvasElement::paint(GraphicsContext* context, const LayoutRect& r, bool useLowQualityScale)
+void HTMLCanvasElement::paint(GraphicsContext* context, const LayoutRect& r)
 {
     // Clear the dirty rect
     m_dirtyRect = FloatRect();
 
     if (context->paintingDisabled())
         return;
 
     if (m_context) {
         if (!paintsIntoCanvasBuffer() && !document().printing())
             return;
         m_context->paintRenderingResultsToCanvas();
     }
 
     if (hasImageBuffer()) {
         ImageBuffer* imageBuffer = buffer();
         if (imageBuffer) {
             CompositeOperator compositeOperator = !m_context || m_context->hasAlpha() ? CompositeSourceOver : CompositeCopy;
             if (m_presentedImage)
-                context->drawImage(m_presentedImage.get(), pixelSnappedIntRect(r), compositeOperator, DoNotRespectImageOrientation, useLowQualityScale);
+                context->drawImage(m_presentedImage.get(), pixelSnappedIntRect(r), compositeOperator, DoNotRespectImageOrientation);
             else
-                context->drawImageBuffer(imageBuffer, pixelSnappedIntRect(r), compositeOperator, blink::WebBlendModeNormal, useLowQualityScale);
+                context->drawImageBuffer(imageBuffer, pixelSnappedIntRect(r), compositeOperator, blink::WebBlendModeNormal);
         }
     }
 
     if (is3D())
         toWebGLRenderingContext(m_context.get())->markLayerComposited();
 }
 
 bool HTMLCanvasElement::is3D() const
 {
     return m_context && m_context->is3d();
@@ skipping 137 matching lines @@
     m_didFailToCreateImageBuffer = false;
 
     updateExternallyAllocatedMemory();
 
     if (is3D()) {
         // Early out for WebGL canvases
         return;
     }
 
     m_imageBuffer->context()->setShouldClampToSourceRect(false);
-    m_imageBuffer->context()->setImageInterpolationQuality(DefaultInterpolationQuality);
+    m_imageBuffer->context()->setImageInterpolationQuality(CanvasDefaultInterpolationQuality);
     // Enabling MSAA overrides a request to disable antialiasing. This is true regardless of whether the
     // rendering mode is accelerated or not. For consistency, we don't want to apply AA in accelerated
     // canvases but not in unaccelerated canvases.
     if (!msaaSampleCount && document().settings() && !document().settings()->antialiased2dCanvasEnabled())
         m_imageBuffer->context()->setShouldAntialias(false);
     // GraphicsContext's defaults don't always agree with the 2d canvas spec.
     // See CanvasRenderingContext2D::State::State() for more information.
     m_imageBuffer->context()->setMiterLimit(10);
     m_imageBuffer->context()->setStrokeThickness(1);
     m_contextStateSaver = adoptPtr(new GraphicsContextStateSaver(*m_imageBuffer->context()));
@@ skipping 157 matching lines @@
 {
     return !originClean();
 }
 
 FloatSize HTMLCanvasElement::sourceSize() const
 {
     return FloatSize(width(), height());
 }
 
 }