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

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