Rounded background image fast path

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 9bbd010949fd43a5af9de31f28dd684f3ebb44d5..d23b503d1dc909611ffb018d9d49ba875e1b6ff3 100644
--- a/third_party/WebKit/Source/platform/graphics/Image.h
+++ b/third_party/WebKit/Source/platform/graphics/Image.h
@@ -44,6 +44,8 @@
 class SkBitmap;
 class SkCanvas;
 class SkImage;
+class SkMatrix;
+class SkPaint;
 
 namespace blink {
 
@@ -150,6 +152,17 @@ public:
 
     virtual void draw(SkCanvas*, const SkPaint&, const FloatRect& dstRect, const FloatRect& srcRect, RespectImageOrientationEnum, ImageClampingMode) = 0;
 
+    virtual bool applyShader(SkPaint&, const SkMatrix* localMatrix);
+
+    // Compute the tile which contains a given point (assuming a repeating tile grid).
+    static FloatRect computeTileContaining(const FloatPoint&, const FloatSize& tileSize,

[chrishtr, 2016/05/20 19:52:35]

Also comment: input point and return value is in destination grid space.

[f(malita), 2016/05/22 14:04:07]

Done.

+        const FloatPoint& tilePhase, const FloatSize& tileSpacing);
+
+    // Compute the image subset which gets mapped onto dest, when the whole image is drawn into
+    // tile.  Assumes the tile contains dest.
+    static FloatRect computeSubsetForTile(const FloatRect& tile, const FloatRect& dest,

[chrishtr, 2016/05/20 19:52:35]

Also comment: tile rect is in destination grid space, and return value is in
the space of the image.

[f(malita), 2016/05/22 14:04:07]

Done.

+        const FloatSize& imageSize);
+
 protected:
     Image(ImageObserver* = 0);