1// Copyright 2013 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef ImageBitmap_h
6#define ImageBitmap_h
7
8#include "bindings/core/v8/ScriptWrappable.h"
9#include "core/html/HTMLImageElement.h"
10#include "core/html/canvas/CanvasImageSource.h"
11#include "platform/geometry/IntRect.h"
12#include "platform/graphics/Image.h"
13#include "platform/heap/Handle.h"
14#include "wtf/PassRefPtr.h"
15#include "wtf/RefCounted.h"
16
17namespace blink {
18
19class HTMLCanvasElement;
20class HTMLVideoElement;
21class ImageData;
22
23class ImageBitmap FINAL : public RefCountedWillBeGarbageCollectedFinalized<ImageBitmap>, public ScriptWrappable, public ImageLoaderClient, public CanvasImageSource {
24    DEFINE_WRAPPERTYPEINFO();
25    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(ImageBitmap);
26public:
27    static PassRefPtrWillBeRawPtr<ImageBitmap> create(HTMLImageElement*, const IntRect&);
28    static PassRefPtrWillBeRawPtr<ImageBitmap> create(HTMLVideoElement*, const IntRect&);
29    static PassRefPtrWillBeRawPtr<ImageBitmap> create(HTMLCanvasElement*, const IntRect&);
30    static PassRefPtrWillBeRawPtr<ImageBitmap> create(ImageData*, const IntRect&);
31    static PassRefPtrWillBeRawPtr<ImageBitmap> create(ImageBitmap*, const IntRect&);
32    static PassRefPtrWillBeRawPtr<ImageBitmap> create(Image*, const IntRect&);
33
34    PassRefPtr<Image> bitmapImage() const;
35    PassRefPtrWillBeRawPtr<HTMLImageElement> imageElement() const { return m_imageElement; }
36
37    IntRect bitmapRect() const { return m_bitmapRect; }
38
39    int width() const { return m_cropRect.width(); }
40    int height() const { return m_cropRect.height(); }
41    IntSize size() const { return m_cropRect.size(); }
42
43    virtual ~ImageBitmap();
44
45    // CanvasImageSource implementation
46    virtual PassRefPtr<Image> getSourceImageForCanvas(SourceImageMode, SourceImageStatus*) const OVERRIDE;
47    virtual bool wouldTaintOrigin(SecurityOrigin*) const OVERRIDE { return false; };
48    virtual void adjustDrawRects(FloatRect* srcRect, FloatRect* dstRect) const OVERRIDE;
49    virtual FloatSize sourceSize() const OVERRIDE;
50
51    virtual void trace(Visitor*);
52
53private:
54    ImageBitmap(HTMLImageElement*, const IntRect&);
55    ImageBitmap(HTMLVideoElement*, const IntRect&);
56    ImageBitmap(HTMLCanvasElement*, const IntRect&);
57    ImageBitmap(ImageData*, const IntRect&);
58    ImageBitmap(ImageBitmap*, const IntRect&);
59    ImageBitmap(Image*, const IntRect&);
60
61    // ImageLoaderClient
62    virtual void notifyImageSourceChanged() OVERRIDE;
63    virtual bool requestsHighLiveResourceCachePriority() OVERRIDE { return true; }
64
65    // ImageBitmaps constructed from HTMLImageElements hold a reference to the HTMLImageElement until
66    // the image source changes.
67    RefPtrWillBeMember<HTMLImageElement> m_imageElement;
68    RefPtr<Image> m_bitmap;
69
70    IntRect m_bitmapRect; // The rect where the underlying Image should be placed in reference to the ImageBitmap.
71    IntRect m_cropRect;
72
73    // The offset by which the desired Image is stored internally.
74    // ImageBitmaps constructed from HTMLImageElements reference the entire ImageResource and may have a non-zero bitmap offset.
75    // ImageBitmaps not constructed from HTMLImageElements always pre-crop and store the image at (0, 0).
76    IntPoint m_bitmapOffset;
77
78};
79
80} // namespace blink
81
82#endif // ImageBitmap_h
83