refractoring ImageBitmap class

third_party/WebKit/Source/core/frame/ImageBitmap.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ImageBitmap_h
 #define ImageBitmap_h
 
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/CoreExport.h"
 #include "core/html/HTMLImageElement.h"
 #include "core/html/canvas/CanvasImageSource.h"
 #include "platform/geometry/IntRect.h"
 #include "platform/graphics/Image.h"
+#include "platform/graphics/ImageBuffer.h"
 #include "platform/heap/Handle.h"
+#include "third_party/skia/include/core/SkImage.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 
 namespace blink {
 
 class HTMLCanvasElement;
 class HTMLVideoElement;
 class ImageData;
 
 class CORE_EXPORT ImageBitmap final : public RefCountedWillBeGarbageCollectedFinalized<ImageBitmap>, public ScriptWrappable, public ImageLoaderClient, public CanvasImageSource {
     DEFINE_WRAPPERTYPEINFO();
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(ImageBitmap);
 public:
     static PassRefPtrWillBeRawPtr<ImageBitmap> create(HTMLImageElement*, const IntRect&);
     static PassRefPtrWillBeRawPtr<ImageBitmap> create(HTMLVideoElement*, const IntRect&);
     static PassRefPtrWillBeRawPtr<ImageBitmap> create(HTMLCanvasElement*, const IntRect&);
     static PassRefPtrWillBeRawPtr<ImageBitmap> create(ImageData*, const IntRect&);
     static PassRefPtrWillBeRawPtr<ImageBitmap> create(ImageBitmap*, const IntRect&);
     static PassRefPtrWillBeRawPtr<ImageBitmap> create(Image*, const IntRect&);
 
-    PassRefPtr<Image> bitmapImage() const;
-    PassRefPtrWillBeRawPtr<HTMLImageElement> imageElement() const { return m_imageElement; }
-
-    IntRect bitmapRect() const { return m_bitmapRect; }
-
-    int width() const { return m_cropRect.width(); }
-    int height() const { return m_cropRect.height(); }
-    IntSize size() const { return m_cropRect.size(); }
+    SkImage* skImage() const { return (m_image) ? m_image.get() : nullptr; }
+    int width() const { return (m_image) ? m_image->width(): 0; }
+    int height() const { return (m_image) ? m_image->height(): 0; }
+    IntSize size() const { return (m_image) ? IntSize(m_image->width(), m_image->height()) : IntSize(); }
 
     ~ImageBitmap() override;
 
     // CanvasImageSource implementation
     PassRefPtr<Image> getSourceImageForCanvas(SourceImageStatus*, AccelerationHint) const override;
     bool wouldTaintOrigin(SecurityOrigin*) const override { return false; }
     void adjustDrawRects(FloatRect* srcRect, FloatRect* dstRect) const override;
     FloatSize elementSize() const override;
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     ImageBitmap(HTMLImageElement*, const IntRect&);
     ImageBitmap(HTMLVideoElement*, const IntRect&);
     ImageBitmap(HTMLCanvasElement*, const IntRect&);
     ImageBitmap(ImageData*, const IntRect&);
     ImageBitmap(ImageBitmap*, const IntRect&);
     ImageBitmap(Image*, const IntRect&);
 
+    PassRefPtr<SkImage> cropImage(PassRefPtr<SkImage>, const IntRect&);
+
     // ImageLoaderClient
     void notifyImageSourceChanged() override;
     bool requestsHighLiveResourceCachePriority() override { return true; }
 
-    // ImageBitmaps constructed from HTMLImageElements hold a reference to the HTMLImageElement until
-    // the image source changes.
-    RefPtrWillBeMember<HTMLImageElement> m_imageElement;
-    RefPtr<Image> m_bitmap;
-
-    IntRect m_bitmapRect; // The rect where the underlying Image should be placed in reference to the ImageBitmap.
-    IntRect m_cropRect;
-
-    // The offset by which the desired Image is stored internally.
-    // ImageBitmaps constructed from HTMLImageElements reference the entire ImageResource and may have a non-zero bitmap offset.
-    // ImageBitmaps not constructed from HTMLImageElements always pre-crop and store the image at (0, 0).
-    IntPoint m_bitmapOffset;
-
+    RefPtr<SkImage> m_image;
 };
 
 } // namespace blink
 
 #endif // ImageBitmap_h