Use newImageSnapshot() to get an image from a 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/ImageOrientation.h"
 #include "platform/graphics/skia/NativeImageSkia.h"
+#include "third_party/skia/include/core/SkImage.h"

[Justin Novosad, 2014/07/29 14:56:52]

forward declare instead.

[Rémi Piotaix, 2014/07/29 17:18:22]

Done.

 #include "third_party/skia/include/core/SkXfermode.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"
 
 namespace blink {
 
@@ skipping 16 matching lines @@
 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 currentFrameKnownToBeOpaque() = 0;
 
+    virtual PassRefPtr<SkImage> image() { return nullptr; }

[Justin Novosad, 2014/07/29 14:56:52]

move to .cpp if SkImage is forward declared.

[Rémi Piotaix, 2014/07/29 17:18:22]

Done.

+
     // 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(); }
 
     virtual void setContainerSize(const IntSize&) { }
     virtual bool usesContainerSize() const { return false; }
     virtual bool hasRelativeWidth() const { return false; }
@@ skipping 61 matching lines @@
     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())
 
 }
 
 #endif