Change filter quality when scaling-down in drawImage

third_party/WebKit/Source/platform/graphics/Image.h

Index: third_party/WebKit/Source/platform/graphics/Image.h
diff --git a/third_party/WebKit/Source/platform/graphics/Image.h b/third_party/WebKit/Source/platform/graphics/Image.h
index 841a2ea4ea92d73524c02e32082db48001097da1..344a1b51d0d50c40cfb705cf092650b617cf5e05 100644
--- a/third_party/WebKit/Source/platform/graphics/Image.h
+++ b/third_party/WebKit/Source/platform/graphics/Image.h
@@ -28,6 +28,7 @@
 #define Image_h
 
 #include "platform/PlatformExport.h"
+#include "platform/geometry/FloatRect.h"
 #include "platform/geometry/IntRect.h"
 #include "platform/graphics/Color.h"
 #include "platform/graphics/GraphicsTypes.h"
@@ -149,7 +150,11 @@ public:
         DoNotClampImageToSourceRect
     };
 
-    virtual void draw(SkCanvas*, const SkPaint&, const FloatRect& dstRect, const FloatRect& srcRect, RespectImageOrientationEnum, ImageClampingMode) = 0;
+    virtual void draw(SkCanvas*, const SkPaint&, const FloatRect& dstRect, const FloatRect& srcRect, bool imageSmoothingEnabled, RespectImageOrientationEnum, ImageClampingMode) = 0;

[f(malita), 2016/07/18 15:46:38]

Instead of plumbing imageSmoothingEnabled in the Image API, why not adjust the
SkPaint filter quality before calling draw(...)?

[fs, 2016/07/18 15:56:55]

I was about to make a note about the same thing =). If it's about the
"adjusted*Rect"s being different, I don't think that's the case, since (IIRC)
the canvas code already clips the source rect and doesn't use image-orientation.

+    static bool isDrawScalingDown(const FloatRect& srcRect, const FloatRect& dstRect)
+    {
+        return dstRect.width() < srcRect.width() && dstRect.height() < srcRect.height();
+    }
 
     virtual bool applyShader(SkPaint&, const SkMatrix& localMatrix);