Make SVG images for custom CSS cursors appear sharp on retina displays

Source/core/svg/graphics/SVGImage.h

 /*
  * Copyright (C) 2006 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Apple 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 23 matching lines @@
 class Element;
 class FrameView;
 class ImageBuffer;
 class Page;
 class RenderBox;
 class SVGImageChromeClient;
 class SVGImageForContainer;
 
 class SVGImage : public Image {
 public:
-    static PassRefPtr<SVGImage> create(ImageObserver* observer)
+    static PassRefPtr<SVGImage> create(ImageObserver* observer, float deviceScaleFactor)
     {
-        return adoptRef(new SVGImage(observer));
+        return adoptRef(new SVGImage(observer, deviceScaleFactor));
     }
 
     static bool isInSVGImage(const Element*);
 
     RenderBox* embeddedContentBox() const;
 
     virtual bool isSVGImage() const OVERRIDE { return true; }
     virtual IntSize size() const OVERRIDE { return m_intrinsicSize; }
 
     virtual bool currentFrameHasSingleSecurityOrigin() const OVERRIDE;
 
     virtual bool hasRelativeWidth() const OVERRIDE;
     virtual bool hasRelativeHeight() const OVERRIDE;
 
     virtual void startAnimation(bool /*catchUpIfNecessary*/ = true) OVERRIDE;
     virtual void stopAnimation() OVERRIDE;
     virtual void resetAnimation() OVERRIDE;
 
-    virtual PassRefPtr<NativeImageSkia> nativeImageForCurrentFrame() OVERRIDE;
+    virtual PassRefPtr<NativeImageSkia> nativeImageForCurrentFrame(ScaleHint /*hint*/ = UseNativeScale) OVERRIDE;
 
 private:
     friend class AXRenderObject;
     friend class SVGImageChromeClient;
     friend class SVGImageForContainer;
 
     virtual ~SVGImage();
 
     // Returns the SVG image document's frame.
     FrameView* frameView() const;
 
     virtual String filenameExtension() const OVERRIDE;
 
     virtual void setContainerSize(const IntSize&) OVERRIDE;
     IntSize containerSize() const;
     virtual bool usesContainerSize() const OVERRIDE { return true; }
     virtual void computeIntrinsicDimensions(Length& intrinsicWidth, Length& intrinsicHeight, FloatSize& intrinsicRatio) OVERRIDE;
 
     virtual bool dataChanged(bool allDataReceived) OVERRIDE;
 
     // FIXME: SVGImages are underreporting decoded sizes and will be unable
     // to prune because these functions are not implemented yet.
     virtual void destroyDecodedData(bool) OVERRIDE { }
 
     // FIXME: Implement this to be less conservative.
     virtual bool currentFrameKnownToBeOpaque() OVERRIDE { return false; }
 
-    SVGImage(ImageObserver*);
+    SVGImage(ImageObserver*, float deviceScaleFactor);
     virtual void draw(GraphicsContext*, const FloatRect& fromRect, const FloatRect& toRect, CompositeOperator, blink::WebBlendMode) OVERRIDE;
     void drawForContainer(GraphicsContext*, const FloatSize, float, const FloatRect&, const FloatRect&, CompositeOperator, blink::WebBlendMode);
     void drawPatternForContainer(GraphicsContext*, const FloatSize, float, const FloatRect&, const FloatSize&, const FloatPoint&,
         CompositeOperator, const FloatRect&, blink::WebBlendMode, const IntSize& repeatSpacing);
 
     OwnPtr<SVGImageChromeClient> m_chromeClient;
     OwnPtr<Page> m_page;
     IntSize m_intrinsicSize;
+    float m_deviceScaleFactor;
 };
 
 inline SVGImage* toSVGImage(Image* image)
 {
     ASSERT_WITH_SECURITY_IMPLICATION(!image || image->isSVGImage());
     return static_cast<SVGImage*>(image);
 }
 
 class ImageObserverDisabler {
     WTF_MAKE_NONCOPYABLE(ImageObserverDisabler);
@@ skipping 11 matching lines @@
         m_image->setImageObserver(m_observer);
     }
 private:
     Image* m_image;
     ImageObserver* m_observer;
 };
 
 }
 
 #endif // SVGImage_h