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/*
* Copyright (C) 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 PNGImageDecoder_h
#define PNGImageDecoder_h
#include "ImageDecoder.h"
#include <wtf/OwnPtr.h>
namespace WebCore {
class PNGImageReader;
// This class decodes the PNG image format.
class PNGImageDecoder : public ImageDecoder {
public:
PNGImageDecoder(ImageSource::AlphaOption, ImageSource::GammaAndColorProfileOption);
virtual ~PNGImageDecoder();
// ImageDecoder
virtual String filenameExtension() const { return "png"; }
virtual bool isSizeAvailable();
virtual bool setSize(unsigned width, unsigned height);
virtual ImageFrame* frameBufferAtIndex(size_t index);
// CAUTION: setFailed() deletes |m_reader|. Be careful to avoid
// accessing deleted memory, especially when calling this from inside
// PNGImageReader!
virtual bool setFailed();
// Callbacks from libpng
void headerAvailable();
void rowAvailable(unsigned char* rowBuffer, unsigned rowIndex, int interlacePass);
void pngComplete();
bool isComplete() const
{
return !m_frameBufferCache.isEmpty() && (m_frameBufferCache.first().status() == ImageFrame::FrameComplete);
}
private:
// Decodes the image. If |onlySize| is true, stops decoding after
// calculating the image size. If decoding fails but there is no more
// data coming, sets the "decode failure" flag.
void decode(bool onlySize);
OwnPtr<PNGImageReader> m_reader;
bool m_doNothingOnFailure;
};
} // namespace WebCore
#endif
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