| /* |
| * 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 |
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| * (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 BMPImageDecoder_h |
| #define BMPImageDecoder_h |
| |
| #include "core/platform/image-decoders/bmp/BMPImageReader.h" |
| #include "wtf/OwnPtr.h" |
| |
| namespace WebCore { |
| |
| // This class decodes the BMP image format. |
| class BMPImageDecoder : public ImageDecoder { |
| public: |
| BMPImageDecoder(ImageSource::AlphaOption, ImageSource::GammaAndColorProfileOption, size_t maxDecodedBytes); |
| |
| // ImageDecoder |
| virtual String filenameExtension() const { return "bmp"; } |
| virtual void setData(SharedBuffer*, bool allDataReceived); |
| virtual bool isSizeAvailable(); |
| virtual ImageFrame* frameBufferAtIndex(size_t); |
| // CAUTION: setFailed() deletes |m_reader|. Be careful to avoid |
| // accessing deleted memory, especially when calling this from inside |
| // BMPImageReader! |
| virtual bool setFailed(); |
| |
| private: |
| inline uint32_t readUint32(int offset) const |
| { |
| return BMPImageReader::readUint32(m_data.get(), 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); |
| |
| // 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. |
| OwnPtr<BMPImageReader> m_reader; |
| }; |
| |
| } // namespace WebCore |
| |
| #endif |