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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 <wtf/Noncopyable.h>
#include <wtf/Vector.h>
#if PLATFORM(WX)
class wxBitmap;
class wxGraphicsBitmap;
#elif PLATFORM(CG)
typedef struct CGImageSource* CGImageSourceRef;
typedef struct CGImage* CGImageRef;
typedef const struct __CFData* CFDataRef;
#elif PLATFORM(QT)
#include <qglobal.h>
QT_BEGIN_NAMESPACE
class QPixmap;
QT_END_NAMESPACE
#elif PLATFORM(CAIRO)
struct _cairo_surface;
typedef struct _cairo_surface cairo_surface_t;
#elif PLATFORM(SKIA)
class NativeImageSkia;
#endif
namespace WebCore {
class IntSize;
class SharedBuffer;
class String;
#if PLATFORM(WX)
class ImageDecoder;
typedef ImageDecoder* NativeImageSourcePtr;
typedef const Vector<char>* NativeBytePtr;
#if USE(WXGC)
typedef wxGraphicsBitmap* NativeImagePtr;
#else
typedef wxBitmap* NativeImagePtr;
#endif
#elif PLATFORM(CG)
typedef CGImageSourceRef NativeImageSourcePtr;
typedef CGImageRef NativeImagePtr;
#elif PLATFORM(QT)
class ImageDecoderQt;
typedef ImageDecoderQt* NativeImageSourcePtr;
typedef QPixmap* NativeImagePtr;
#elif PLATFORM(CAIRO)
class ImageDecoder;
typedef ImageDecoder* NativeImageSourcePtr;
typedef cairo_surface_t* NativeImagePtr;
#elif PLATFORM(SKIA)
class ImageDecoder;
typedef ImageDecoder* NativeImageSourcePtr;
typedef NativeImageSkia* NativeImagePtr;
#endif
const int cAnimationLoopOnce = -1;
const int cAnimationNone = -2;
class ImageSource : Noncopyable {
public:
ImageSource();
~ImageSource();
// Tells the ImageSource that the Image no longer cares about decoded frame
// data -- at all (if |destroyAll| is true), or before frame
// |clearBeforeFrame| (if |destroyAll| is false). The ImageSource should
// delete cached decoded data for these frames where possible to keep memory
// usage low. When |destroyAll| is true, the ImageSource should also reset
// any local state so that decoding can begin again.
//
// Implementations that delete less than what's specified above waste
// memory. Implementations that delete more may burn CPU re-decoding frames
// that could otherwise have been cached, or encounter errors if they're
// asked to decode frames they can't decode due to the loss of previous
// decoded frames.
//
// Callers should not call clear(false, n) and subsequently call
// createFrameAtIndex(m) with m < n, unless they first call clear(true).
// This ensures that stateful ImageSources/decoders will work properly.
//
// The |data| and |allDataReceived| parameters should be supplied by callers
// who set |destroyAll| to true if they wish to be able to continue using
// the ImageSource. This way implementations which choose to destroy their
// decoders in some cases can reconstruct them correctly.
void clear(bool destroyAll,
size_t clearBeforeFrame = 0,
SharedBuffer* data = NULL,
bool allDataReceived = false);
bool initialized() const;
void setData(SharedBuffer* data, bool allDataReceived);
String filenameExtension() const;
bool isSizeAvailable();
IntSize size() const;
IntSize frameSizeAtIndex(size_t) const;
int repetitionCount();
size_t frameCount() const;
// Callers should not call this after calling clear() with a higher index;
// see comments on clear() above.
NativeImagePtr createFrameAtIndex(size_t);
float frameDurationAtIndex(size_t);
bool frameHasAlphaAtIndex(size_t); // Whether or not the frame actually used any alpha.
bool frameIsCompleteAtIndex(size_t); // Whether or not the frame is completely decoded.
// FIXME: This is protected only to allow ImageSourceSkia to set ICO decoder
// with a preferred size. See ImageSourceSkia.h for discussion.
protected:
NativeImageSourcePtr m_decoder;
};
}
#endif
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