Change filter quality when scaling-down in drawImage

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

 /*
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2008 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
@@ skipping 217 matching lines @@
 bool BitmapImage::hasColorProfile() const
 {
     return m_source.hasColorProfile();
 }
 
 String BitmapImage::filenameExtension() const
 {
     return m_source.filenameExtension();
 }
 
-void BitmapImage::draw(SkCanvas* canvas, const SkPaint& paint, const FloatRect& dstRect, const FloatRect& srcRect, RespectImageOrientationEnum shouldRespectImageOrientation, ImageClampingMode clampMode)
+void BitmapImage::draw(SkCanvas* canvas, const SkPaint& paint, const FloatRect& dstRect, const FloatRect& srcRect, bool imageSmoothingEnabled, RespectImageOrientationEnum shouldRespectImageOrientation, ImageClampingMode clampMode)
 {
     TRACE_EVENT0("skia", "BitmapImage::draw");
 
     RefPtr<SkImage> image = imageForCurrentFrame();
     if (!image)
         return; // It's too early and we don't have an image yet.
 
     FloatRect adjustedSrcRect = srcRect;
     adjustedSrcRect.intersect(SkRect::Make(image->bounds()));
 
@@ skipping 15 matching lines @@
 
         canvas->concat(affineTransformToSkMatrix(orientation.transformFromDefault(adjustedDstRect.size())));
 
         if (orientation.usesWidthAsHeight()) {
             // The destination rect will have it's width and height already reversed for the orientation of
             // the image, as it was needed for page layout, so we need to reverse it back here.
             adjustedDstRect = FloatRect(adjustedDstRect.x(), adjustedDstRect.y(), adjustedDstRect.height(), adjustedDstRect.width());
         }
     }
 
-    canvas->drawImageRect(image.get(), adjustedSrcRect, adjustedDstRect, &paint,
+    SkPaint adjustedPaint = paint;
+    if (!imageSmoothingEnabled && Image::isDrawScalingDown(adjustedSrcRect, adjustedDstRect))
+        adjustedPaint.setFilterQuality(kLow_SkFilterQuality);
+
+    canvas->drawImageRect(image.get(), adjustedSrcRect, adjustedDstRect, &adjustedPaint,
         WebCoreClampingModeToSkiaRectConstraint(clampMode));
 
     if (image->isLazyGenerated())
         PlatformInstrumentation::didDrawLazyPixelRef(image->uniqueID());
 
     if (ImageObserver* observer = getImageObserver())
         observer->didDraw(this);
 
     startAnimation();
 }
@@ skipping 305 matching lines @@
 
     // We need to draw this frame if we advanced to it while not skipping, or if
     // while trying to skip frames we hit the last frame and thus had to stop.
     if (skippingFrames != advancedAnimation)
         getImageObserver()->animationAdvanced(this);
 
     return advancedAnimation;
 }
 
 } // namespace blink