Use newImageSnapshot() to get an image from a Canvas

Source/platform/graphics/StaticBitmapImage.h

Index: Source/platform/graphics/StaticBitmapImage.h
diff --git a/Source/platform/graphics/ImageObserver.h b/Source/platform/graphics/StaticBitmapImage.h
similarity index 63%
copy from Source/platform/graphics/ImageObserver.h
copy to Source/platform/graphics/StaticBitmapImage.h
index a01e0b641f0e05c253c062aaa252f79b1bf00dfb..e8daa16bf07ea07b8a7161da9c58a012c30a5789 100644
--- a/Source/platform/graphics/ImageObserver.h
+++ b/Source/platform/graphics/StaticBitmapImage.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.  All rights reserved.
+ * Copyright (C) 2008 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
@@ -23,29 +23,31 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef ImageObserver_h
-#define ImageObserver_h
+#ifndef StaticBitmapImage_h
+#define StaticBitmapImage_h
 
-#include "platform/PlatformExport.h"
+#include "SkImage.h"
 
-namespace WebCore {
+#include "platform/graphics/Image.h"
 
-class Image;
-class IntRect;
+namespace WebCore {
 
-// Interface for notification about changes to an image, including decoding,
-// drawing, and animating.
-class PLATFORM_EXPORT ImageObserver {
-protected:
-    virtual ~ImageObserver();
+class PLATFORM_EXPORT StaticBitmapImage : public Image {
 public:
-    virtual void decodedSizeChanged(const Image*, int delta) = 0;
-    virtual void didDraw(const Image*) = 0;
 
-    virtual bool shouldPauseAnimation(const Image*) = 0;
-    virtual void animationAdvanced(const Image*) = 0;
+    static PassRefPtr<Image> create(PassRefPtr<SkImage>);
+    virtual void destroyDecodedData(bool destroyAll) { }
+    virtual bool currentFrameKnownToBeOpaque() { return false; }
+    virtual IntSize size() const { return IntSize(m_image->height(), m_image->width()); }
+    virtual void draw(GraphicsContext*, const FloatRect& dstRect, const FloatRect& srcRect, CompositeOperator, blink::WebBlendMode);
+
+
+    PassRefPtr<SkImage> image() OVERRIDE { return m_image; }
+
+protected:
+    StaticBitmapImage(PassRefPtr<SkImage>);
 
-    virtual void changedInRect(const Image*, const IntRect&) = 0;
+    RefPtr<SkImage> m_image;
 };
 
 }