Removing the dependency on GraphicsContext for drawing images in 2D canvas

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 15 matching lines @@
 
 #ifndef Image_h
 #define Image_h
 
 #include "platform/PlatformExport.h"
 #include "platform/geometry/IntRect.h"
 #include "platform/graphics/Color.h"
 #include "platform/graphics/GraphicsTypes.h"
 #include "platform/graphics/ImageAnimationPolicy.h"
 #include "platform/graphics/ImageOrientation.h"
-#include "third_party/skia/include/core/SkXfermode.h"
+#include "third_party/skia/include/core/SkCanvas.h"
 #include "wtf/Assertions.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 #include "wtf/RefPtr.h"
 #include "wtf/RetainPtr.h"
 #include "wtf/text/WTFString.h"
 
 class SkBitmap;
 class SkImage;
 
 namespace blink {
 
 class FloatPoint;
 class FloatRect;
 class FloatSize;
 class GraphicsContext;
 class Length;
 class SharedBuffer;
+class Image;
 
 // This class gets notified when an image creates or destroys decoded frames and when it advances animation frames.
 class ImageObserver;
 
+class ImageFilterQualityHelper {
+public:
+    virtual SkFilterQuality computeFilterQuality(Image*, const FloatRect& dest, const FloatRect& src) const = 0;
+    virtual bool shouldClampToSourceRect() const = 0;
+    virtual bool shouldDrawAntiAliased(const FloatRect&destRect) const = 0;
+    virtual ~ImageFilterQualityHelper() { }
+};
+
 class PLATFORM_EXPORT Image : public RefCounted<Image> {
     friend class GeneratedImage;
     friend class CrossfadeGeneratedImage;
     friend class GradientGeneratedImage;
     friend class GraphicsContext;
 
 public:
     virtual ~Image();
 
     static PassRefPtr<Image> loadPlatformResource(const char* name);
     static bool supportsType(const String&);
 
     virtual bool isSVGImage() const { return false; }
     virtual bool isBitmapImage() const { return false; }
+    virtual bool isLazyDecodedBitmap() { return false; }
+    virtual bool isImmutableBitmap() { return false; }
     virtual bool currentFrameKnownToBeOpaque() = 0;
 
     virtual PassRefPtr<SkImage> skImage();
 
     // Derived classes should override this if they can assure that the current
     // image frame contains only resources from its own security origin.
     virtual bool currentFrameHasSingleSecurityOrigin() const { return false; }
 
     static Image* nullImage();
     bool isNull() const { return size().isEmpty(); }
@@ skipping 48 matching lines @@
     virtual PassRefPtr<Image> imageForDefaultFrame();
 
     virtual void drawPattern(GraphicsContext*, const FloatRect&,
         const FloatSize&, const FloatPoint& phase, SkXfermode::Mode,
         const FloatRect&, const IntSize& repeatSpacing = IntSize());
 
 #if ENABLE(ASSERT)
     virtual bool notSolidColor() { return true; }
 #endif
 
+    virtual void draw(SkCanvas*, const SkPaint&, const FloatRect& dstRect, const FloatRect& srcRect, RespectImageOrientationEnum, const ImageFilterQualityHelper*) = 0;
+
 protected:
     Image(ImageObserver* = 0);
 
     static void fillWithSolidColor(GraphicsContext*, const FloatRect& dstRect, const Color&, SkXfermode::Mode);
     static FloatRect adjustForNegativeSize(const FloatRect&); // A helper method for translating negative width and height values.
 
-    virtual void draw(GraphicsContext*, const FloatRect& dstRect, const FloatRect& srcRect, SkXfermode::Mode, RespectImageOrientationEnum) = 0;
     void drawTiled(GraphicsContext*, const FloatRect& dstRect, const FloatPoint& srcPoint, const FloatSize& tileSize,
         SkXfermode::Mode, const IntSize& repeatSpacing);
     void drawTiled(GraphicsContext*, const FloatRect& dstRect, const FloatRect& srcRect, const FloatSize& tileScaleFactor, TileRule hRule, TileRule vRule, SkXfermode::Mode);
 
     // Supporting tiled drawing
     virtual bool mayFillWithSolidColor() { return false; }
     virtual Color solidColor() const { return Color(); }
 
 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