Use refs for GraphicsContext

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 127 matching lines @@
 
     // Typically the ImageResource that owns us.
     ImageObserver* imageObserver() const { return m_imageObserver; }
     void setImageObserver(ImageObserver* observer) { m_imageObserver = observer; }
 
     enum TileRule { StretchTile, RoundTile, SpaceTile, RepeatTile };
 
     virtual PassRefPtr<SkImage> imageForCurrentFrame() = 0;
     virtual PassRefPtr<Image> imageForDefaultFrame();
 
-    virtual void drawPattern(GraphicsContext*, const FloatRect&,
+    virtual void drawPattern(GraphicsContext&, const FloatRect&,
         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;
 
 protected:
     Image(ImageObserver* = 0);
 
-    void drawTiled(GraphicsContext*, const FloatRect& dstRect, const FloatPoint& srcPoint, const FloatSize& tileSize,
+    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);
+    void drawTiled(GraphicsContext&, const FloatRect& dstRect, const FloatRect& srcRect, const FloatSize& tileScaleFactor, TileRule hRule, TileRule vRule, SkXfermode::Mode);
 
 private:
     RefPtr<SharedBuffer> m_encodedImageData;
     ImageObserver* m_imageObserver;
 };
 
 #define DEFINE_IMAGE_TYPE_CASTS(typeName) \
     DEFINE_TYPE_CASTS(typeName, Image, image, image->is##typeName(), image.is##typeName())
 
 } // namespace blink
 
 #endif