Change filter quality when scaling-down in drawImage

third_party/WebKit/Source/platform/graphics/GradientGeneratedImage.cpp

 /*
  * Copyright (C) 2008, 2009, 2010, 2012 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 14 matching lines @@
 
 #include "platform/graphics/GradientGeneratedImage.h"
 
 #include "platform/geometry/FloatRect.h"
 #include "platform/geometry/IntSize.h"
 #include "platform/graphics/GraphicsContext.h"
 
 namespace blink {
 
 void GradientGeneratedImage::draw(SkCanvas* canvas, const SkPaint& paint, const FloatRect& destRect,
-    const FloatRect& srcRect, RespectImageOrientationEnum, ImageClampingMode)
+    const FloatRect& srcRect, bool imageSmoothingEnabled, RespectImageOrientationEnum, ImageClampingMode)
 {
     SkRect visibleSrcRect = srcRect;
     if (!visibleSrcRect.intersect(SkRect::MakeIWH(m_size.width(), m_size.height())))
         return;
 
     const SkMatrix transform = SkMatrix::MakeRectToRect(srcRect, destRect, SkMatrix::kFill_ScaleToFit);
     SkRect visibleDestRect;
     transform.mapRect(&visibleDestRect, visibleSrcRect);
 
     SkPaint gradientPaint(paint);
     m_gradient->applyToPaint(gradientPaint, transform);
+
+    if (!imageSmoothingEnabled && Image::isDrawScalingDown(visibleSrcRect, visibleDestRect))
+        gradientPaint.setFilterQuality(kLow_SkFilterQuality);
+
     canvas->drawRect(visibleDestRect, gradientPaint);
 }
 
 void GradientGeneratedImage::drawTile(GraphicsContext& context, const FloatRect& srcRect)
 {
     SkPaint gradientPaint(context.fillPaint());
     m_gradient->applyToPaint(gradientPaint, SkMatrix::I());
 
     context.drawRect(srcRect, gradientPaint);
 }
 
 bool GradientGeneratedImage::applyShader(SkPaint& paint, const SkMatrix& localMatrix)
 {
     DCHECK(m_gradient);
     m_gradient->applyToPaint(paint, localMatrix);
 
     return true;
 }
 
 } // namespace blink