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/*
* Copyright (c) 2008, 2009, Google 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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 THE COPYRIGHT
* OWNER 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.
*/
#pragma once
#include "BMPImageReader.h"
namespace WebCore {
// This class decodes the BMP image format.
class BMPImageDecoder final : public ScalableImageDecoder {
public:
static Ref<ScalableImageDecoder> create(AlphaOption alphaOption, GammaAndColorProfileOption gammaAndColorProfileOption)
{
return adoptRef(*new BMPImageDecoder(alphaOption, gammaAndColorProfileOption));
}
// ScalableImageDecoder
String filenameExtension() const final { return "bmp"_s; }
void setData(const FragmentedSharedBuffer&, bool allDataReceived) final;
ScalableImageDecoderFrame* frameBufferAtIndex(size_t index) final;
// CAUTION: setFailed() deletes |m_reader|. Be careful to avoid
// accessing deleted memory, especially when calling this from inside
// BMPImageReader!
bool setFailed() final;
private:
BMPImageDecoder(AlphaOption, GammaAndColorProfileOption);
void tryDecodeSize(bool allDataReceived) final { decode(true, allDataReceived); }
inline uint32_t readUint32(int offset) const
{
return BMPImageReader::readUint32(*m_data, m_decodedOffset + offset);
}
// 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, bool allDataReceived);
// Decodes the image. If |onlySize| is true, stops decoding after
// calculating the image size. Returns whether decoding succeeded.
bool decodeHelper(bool onlySize);
// Processes the file header at the beginning of the data. Sets
// |*imgDataOffset| based on the header contents. Returns true if the
// file header could be decoded.
bool processFileHeader(size_t* imgDataOffset);
// An index into |m_data| representing how much we've already decoded.
// Note that this only tracks data _this_ class decodes; once the
// BMPImageReader takes over this will not be updated further.
size_t m_decodedOffset;
// The reader used to do most of the BMP decoding.
std::unique_ptr<BMPImageReader> m_reader;
};
} // namespace WebCore
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