Implement InterpolationMedium to filter animated images

Source/core/rendering/RenderImage.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Allan Sandfeld Jensen (kde@carewolf.com)
  *           (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011-2012. All rights reserved.
  *
@@ skipping 449 matching lines @@
     if (!m_imageResource->hasImage() || m_imageResource->errorOccurred() || alignedRect.width() <= 0 || alignedRect.height() <= 0)
         return;
 
     RefPtr<Image> img = m_imageResource->image(alignedRect.width(), alignedRect.height());
     if (!img || img->isNull())
         return;
 
     HTMLImageElement* imageElt = (node() && node()->hasTagName(imgTag)) ? toHTMLImageElement(node()) : 0;
     CompositeOperator compositeOperator = imageElt ? imageElt->compositeOperator() : CompositeSourceOver;
     Image* image = m_imageResource->image().get();
-    bool useLowQualityScaling = shouldPaintAtLowQuality(context, image, image, alignedRect.size());
+    InterpolationQuality interpolationQuality = chooseInterpolationQuality(context, image, image, alignedRect.size());
 
     InspectorInstrumentation::willPaintImage(this);
-    context->drawImage(m_imageResource->image(alignedRect.width(), alignedRect.height()).get(), alignedRect, compositeOperator, shouldRespectImageOrientation(), useLowQualityScaling);
+    InterpolationQuality previousInterpolationQuality = context->imageInterpolationQuality();
+    context->setImageInterpolationQuality(interpolationQuality);
+    context->drawImage(m_imageResource->image(alignedRect.width(), alignedRect.height()).get(), alignedRect, compositeOperator, shouldRespectImageOrientation());
+    context->setImageInterpolationQuality(previousInterpolationQuality);
     InspectorInstrumentation::didPaintImage(this);
 }
 
 bool RenderImage::boxShadowShouldBeAppliedToBackground(BackgroundBleedAvoidance bleedAvoidance, InlineFlowBox*) const
 {
     if (!RenderBoxModelObject::boxShadowShouldBeAppliedToBackground(bleedAvoidance))
         return false;
 
     return !const_cast<RenderImage*>(this)->backgroundIsKnownToBeObscured();
 }
@@ skipping 142 matching lines @@
         return 0;
 
     ImageResource* cachedImage = m_imageResource->cachedImage();
     if (cachedImage && cachedImage->image() && cachedImage->image()->isSVGImage())
         return toSVGImage(cachedImage->image())->embeddedContentBox();
 
     return 0;
 }
 
 } // namespace WebCore