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/*
* Copyright (C) 2004, 2005, 2006 Apple Computer, 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. 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 ImageSource_h
#define ImageSource_h
#include "platform/PlatformExport.h"
#include "platform/graphics/ImageOrientation.h"
#include "wtf/Forward.h"
#include "wtf/Noncopyable.h"
#include "wtf/OwnPtr.h"
namespace blink {
class DeferredImageDecoder;
class ImageOrientation;
class IntPoint;
class IntSize;
class NativeImageSkia;
class SharedBuffer;
// GIF and WebP support animation. The explanation below is in terms of GIF,
// but the same constants are used for WebP, too.
// GIFs have an optional 16-bit unsigned loop count that describes how an
// animated GIF should be cycled. If the loop count is absent, the animation
// cycles once; if it is 0, the animation cycles infinitely; otherwise the
// animation plays n + 1 cycles (where n is the specified loop count). If the
// GIF decoder defaults to cAnimationLoopOnce in the absence of any loop count
// and translates an explicit "0" loop count to cAnimationLoopInfinite, then we
// get a couple of nice side effects:
// * By making cAnimationLoopOnce be 0, we allow the animation cycling code in
// BitmapImage.cpp to avoid special-casing it, and simply treat all
// non-negative loop counts identically.
// * By making the other two constants negative, we avoid conflicts with any
// real loop count values.
const int cAnimationLoopOnce = 0;
const int cAnimationLoopInfinite = -1;
const int cAnimationNone = -2;
class PLATFORM_EXPORT ImageSource {
WTF_MAKE_NONCOPYABLE(ImageSource);
public:
enum AlphaOption {
AlphaPremultiplied,
AlphaNotPremultiplied
};
enum GammaAndColorProfileOption {
GammaAndColorProfileApplied,
GammaAndColorProfileIgnored
};
ImageSource(AlphaOption alphaOption = AlphaPremultiplied, GammaAndColorProfileOption gammaAndColorProfileOption = GammaAndColorProfileApplied);
~ImageSource();
// Tells the ImageSource that the Image no longer cares about decoded frame
// data except for the specified frame. Callers may pass WTF::kNotFound to
// clear all frames.
//
// In response, the ImageSource should delete cached decoded data for other
// frames where possible to keep memory use low. The expectation is that in
// the future, the caller may call createFrameAtIndex() with an index larger
// than the one passed to this function, and the implementation may then
// make use of the preserved frame data here in decoding that frame.
// By contrast, callers who call this function and then later ask for an
// earlier frame may require more work to be done, e.g. redecoding the image
// from the beginning.
//
// Implementations may elect to preserve more frames than the one requested
// here if doing so is likely to save CPU time in the future, but will pay
// an increased memory cost to do so.
//
// Returns the number of bytes of frame data actually cleared.
size_t clearCacheExceptFrame(size_t);
bool initialized() const;
void resetDecoder();
void setData(SharedBuffer& data, bool allDataReceived);
String filenameExtension() const;
bool isSizeAvailable();
bool hasColorProfile() const;
IntSize size(RespectImageOrientationEnum = DoNotRespectImageOrientation) const;
IntSize frameSizeAtIndex(size_t, RespectImageOrientationEnum = DoNotRespectImageOrientation) const;
bool getHotSpot(IntPoint&) const;
// Returns one of the cAnimationXXX constants at the top of the file, or
// a loop count. In the latter case, the actual number of times the animation
// cycles is one more than the loop count. See comment atop the file.
int repetitionCount();
size_t frameCount() const;
PassRefPtr<NativeImageSkia> createFrameAtIndex(size_t);
float frameDurationAtIndex(size_t) const;
bool frameHasAlphaAtIndex(size_t) const; // Whether or not the frame actually used any alpha.
bool frameIsCompleteAtIndex(size_t) const; // Whether or not the frame is fully received.
ImageOrientation orientationAtIndex(size_t) const; // EXIF image orientation
// Return the number of bytes in the decoded frame. If the frame is not yet
// decoded then return 0.
unsigned frameBytesAtIndex(size_t) const;
private:
OwnPtr<DeferredImageDecoder> m_decoder;
AlphaOption m_alphaOption;
GammaAndColorProfileOption m_gammaAndColorProfileOption;
};
} // namespace blink
#endif
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