Rounded background image fast path

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

 /*
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2004, 2005, 2006 Apple Computer, 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 26 matching lines @@
 #include "wtf/Assertions.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 #include "wtf/RefPtr.h"
 #include "wtf/text/WTFString.h"
 
 class SkBitmap;
 class SkCanvas;
 class SkImage;
+class SkMatrix;
+class SkPaint;
 
 namespace blink {
 
 class FloatPoint;
 class FloatRect;
 class FloatSize;
 class GraphicsContext;
 class Length;
 class SharedBuffer;
 class Image;
@@ skipping 86 matching lines @@
         const FloatSize&, const FloatPoint& phase, SkXfermode::Mode,
         const FloatRect&, const FloatSize& repeatSpacing = FloatSize());
 
     enum ImageClampingMode {
         ClampImageToSourceRect,
         DoNotClampImageToSourceRect
     };
 
     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);
 
     void drawTiled(GraphicsContext&, const FloatRect& dstRect, const FloatPoint& srcPoint, const FloatSize& tileSize,
         SkXfermode::Mode, const FloatSize& repeatSpacing);
     void drawTiled(GraphicsContext&, const FloatRect& dstRect, const FloatRect& srcRect, const FloatSize& tileScaleFactor, TileRule hRule, TileRule vRule, SkXfermode::Mode);
 
 private:
     RefPtr<SharedBuffer> m_encodedImageData;
     // TODO(Oilpan): consider having Image on the Oilpan heap and
     // turn this into a Member<>.
     //
     // The observer (an ImageResource) is an untraced member, with the ImageResource
     // being responsible of clearing itself out.
     UntracedMember<ImageObserver> m_imageObserver;
     bool m_imageObserverDisabled;
 };
 
 #define DEFINE_IMAGE_TYPE_CASTS(typeName) \
     DEFINE_TYPE_CASTS(typeName, Image, image, image->is##typeName(), image.is##typeName())
 
 } // namespace blink
 
 #endif