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29 #include "platform/PlatformExport.h"
30 #include "platform/graphics/ImageOrientation.h"
31 #include "wtf/Forward.h"
32 #include "wtf/Noncopyable.h"
33 #include "wtf/OwnPtr.h"
34 #include "wtf/Vector.h"
38 class DeferredImageDecoder;
39 class ImageOrientation;
42 class NativeImageSkia;
45 // Right now GIFs are the only recognized image format that supports animation.
46 // The animation system and the constants below are designed with this in mind.
47 // GIFs have an optional 16-bit unsigned loop count that describes how an
48 // animated GIF should be cycled. If the loop count is absent, the animation
49 // cycles once; if it is 0, the animation cycles infinitely; otherwise the
50 // animation plays n + 1 cycles (where n is the specified loop count). If the
51 // GIF decoder defaults to cAnimationLoopOnce in the absence of any loop count
52 // and translates an explicit "0" loop count to cAnimationLoopInfinite, then we
53 // get a couple of nice side effects:
54 // * By making cAnimationLoopOnce be 0, we allow the animation cycling code in
55 // BitmapImage.cpp to avoid special-casing it, and simply treat all
56 // non-negative loop counts identically.
57 // * By making the other two constants negative, we avoid conflicts with any
58 // real loop count values.
59 const int cAnimationLoopOnce = 0;
60 const int cAnimationLoopInfinite = -1;
61 const int cAnimationNone = -2;
63 class PLATFORM_EXPORT ImageSource {
64 WTF_MAKE_NONCOPYABLE(ImageSource);
71 enum GammaAndColorProfileOption {
72 GammaAndColorProfileApplied,
73 GammaAndColorProfileIgnored
76 ImageSource(AlphaOption alphaOption = AlphaPremultiplied, GammaAndColorProfileOption gammaAndColorProfileOption = GammaAndColorProfileApplied);
79 // Tells the ImageSource that the Image no longer cares about decoded frame
80 // data except for the specified frame. Callers may pass WTF::kNotFound to
83 // In response, the ImageSource should delete cached decoded data for other
84 // frames where possible to keep memory use low. The expectation is that in
85 // the future, the caller may call createFrameAtIndex() with an index larger
86 // than the one passed to this function, and the implementation may then
87 // make use of the preserved frame data here in decoding that frame.
88 // By contrast, callers who call this function and then later ask for an
89 // earlier frame may require more work to be done, e.g. redecoding the image
90 // from the beginning.
92 // Implementations may elect to preserve more frames than the one requested
93 // here if doing so is likely to save CPU time in the future, but will pay
94 // an increased memory cost to do so.
96 // Returns the number of bytes of frame data actually cleared.
97 size_t clearCacheExceptFrame(size_t);
99 bool initialized() const;
101 void setData(SharedBuffer* data, bool allDataReceived);
102 String filenameExtension() const;
104 bool isSizeAvailable();
105 IntSize size(RespectImageOrientationEnum = DoNotRespectImageOrientation) const;
106 IntSize frameSizeAtIndex(size_t, RespectImageOrientationEnum = DoNotRespectImageOrientation) const;
108 bool getHotSpot(IntPoint&) const;
110 int repetitionCount();
112 size_t frameCount() const;
114 PassRefPtr<NativeImageSkia> createFrameAtIndex(size_t);
116 float frameDurationAtIndex(size_t) const;
117 bool frameHasAlphaAtIndex(size_t) const; // Whether or not the frame actually used any alpha.
118 bool frameIsCompleteAtIndex(size_t) const; // Whether or not the frame is fully received.
119 ImageOrientation orientationAtIndex(size_t) const; // EXIF image orientation
121 // Return the number of bytes in the decoded frame. If the frame is not yet
122 // decoded then return 0.
123 unsigned frameBytesAtIndex(size_t) const;
126 OwnPtr<DeferredImageDecoder> m_decoder;
128 AlphaOption m_alphaOption;
129 GammaAndColorProfileOption m_gammaAndColorProfileOption;