/*
* Copyright (C) 2006 Apple Computer, Inc. All rights reserved.
* Copyright (C) 2008-2009 Torch Mobile, Inc.
*
* 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 JPEGImageDecoder_h
#define JPEGImageDecoder_h
#include "platform/image-decoders/ImageDecoder.h"
#include "wtf/Noncopyable.h"
#include "wtf/OwnPtr.h"
namespace WebCore {
class JPEGImageReader;
// This class decodes the JPEG image format.
class PLATFORM_EXPORT JPEGImageDecoder : public ImageDecoder {
WTF_MAKE_NONCOPYABLE(JPEGImageDecoder);
public:
JPEGImageDecoder(ImageSource::AlphaOption, ImageSource::GammaAndColorProfileOption, size_t maxDecodedBytes);
virtual ~JPEGImageDecoder();
// ImageDecoder
virtual String filenameExtension() const OVERRIDE { return "jpg"; }
virtual bool isSizeAvailable() OVERRIDE;
virtual IntSize decodedSize() const OVERRIDE { return m_decodedSize; }
virtual bool setSize(unsigned width, unsigned height) OVERRIDE;
virtual ImageFrame* frameBufferAtIndex(size_t) OVERRIDE;
// CAUTION: setFailed() deletes |m_reader|. Be careful to avoid
// accessing deleted memory, especially when calling this from inside
// JPEGImageReader!
virtual bool setFailed() OVERRIDE;
bool outputScanlines();
unsigned desiredScaleNumerator() const;
void jpegComplete();
void setOrientation(ImageOrientation orientation) { m_orientation = orientation; }
void setDecodedSize(unsigned width, unsigned height);
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<JPEGImageReader> m_reader;
IntSize m_decodedSize;
};
} // namespace WebCore
#endif