Refactoring ImageBuffer to decouple it from Canvas2DLayerBridge

Source/platform/graphics/ImageBufferSurface.h

 /*
  * Copyright (c) 2013, Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 10 matching lines @@
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef GaneshUtils_h
-#define GaneshUtils_h
+#ifndef ImageBufferSurface_h
+#define ImageBufferSurface_h
 
 #include "platform/PlatformExport.h"
 #include "platform/geometry/IntSize.h"
-#include "third_party/skia/include/core/SkBitmap.h"
-#include "third_party/skia/include/gpu/GrContext.h"
+#include "platform/graphics/GraphicsTypes3D.h"
+#include "wtf/FastAllocBase.h"
+#include "wtf/Noncopyable.h"
+
+class SkCanvas;
+class SkBitmap;
+
+namespace blink { class WebLayer; }
 
 namespace WebCore {
 
-bool PLATFORM_EXPORT ensureTextureBackedSkBitmap(GrContext*, SkBitmap&, const IntSize&, GrSurfaceOrigin, GrPixelConfig);
+enum OpacityMode {
+    NonOpaque,
+    Opaque,
+};
+
+class PLATFORM_EXPORT ImageBufferSurface {
+    WTF_MAKE_NONCOPYABLE(ImageBufferSurface); WTF_MAKE_FAST_ALLOCATED;
+public:
+    virtual ~ImageBufferSurface() { }
+
+    virtual SkCanvas* canvas() const = 0;
+    virtual const SkBitmap& bitmap() const;
+    virtual void willUse() { } // Called by ImageBuffer before reading or writing to the surface.
+    virtual bool isValid() const = 0;
+    virtual blink::WebLayer* layer() const { return 0; };
+    virtual bool isAccelerated() const { return false; }
+    virtual Platform3DObject getBackingTexture() const { return 0; }
+
+    OpacityMode opacityMode() const { return m_opacityMode; }
+    const IntSize& size() const { return m_size; }
+
+protected:
+    void clear();
+
+    ImageBufferSurface(const IntSize& size, OpacityMode opacityMode)
+        : m_opacityMode(opacityMode)
+        , m_size(size)
+    { }
+
+private:
+    OpacityMode m_opacityMode;
+    IntSize m_size;
+};
 
 } // namespace WebCore
 
-#endif // GaneshUtils_h
+#endif