1 /* 2 * Copyright (c) 2008, 2009, Google Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #ifndef BMPImageDecoder_h 32 #define BMPImageDecoder_h 33 34 #include "platform/image-decoders/bmp/BMPImageReader.h" 35 #include "wtf/OwnPtr.h" 36 37 namespace blink { 38 39 // This class decodes the BMP image format. 40 class PLATFORM_EXPORT BMPImageDecoder : public ImageDecoder { 41 public: 42 BMPImageDecoder(ImageSource::AlphaOption, ImageSource::GammaAndColorProfileOption, size_t maxDecodedBytes); 43 44 // ImageDecoder 45 virtual String filenameExtension() const OVERRIDE { return "bmp"; } 46 virtual void setData(SharedBuffer*, bool allDataReceived) OVERRIDE; 47 virtual bool isSizeAvailable() OVERRIDE; 48 virtual ImageFrame* frameBufferAtIndex(size_t) OVERRIDE; 49 // CAUTION: setFailed() deletes |m_reader|. Be careful to avoid 50 // accessing deleted memory, especially when calling this from inside 51 // BMPImageReader! 52 virtual bool setFailed() OVERRIDE; 53 54 private: 55 inline uint32_t readUint32(int offset) const 56 { 57 return BMPImageReader::readUint32(m_data.get(), m_decodedOffset + offset); 58 } 59 60 // Decodes the image. If |onlySize| is true, stops decoding after 61 // calculating the image size. If decoding fails but there is no more 62 // data coming, sets the "decode failure" flag. 63 void decode(bool onlySize); 64 65 // Decodes the image. If |onlySize| is true, stops decoding after 66 // calculating the image size. Returns whether decoding succeeded. 67 bool decodeHelper(bool onlySize); 68 69 // Processes the file header at the beginning of the data. Sets 70 // |imgDataOffset| based on the header contents. Returns true if the 71 // file header could be decoded. 72 bool processFileHeader(size_t& imgDataOffset); 73 74 // An index into |m_data| representing how much we've already decoded. 75 // Note that this only tracks data _this_ class decodes; once the 76 // BMPImageReader takes over this will not be updated further. 77 size_t m_decodedOffset; 78 79 // The reader used to do most of the BMP decoding. 80 OwnPtr<BMPImageReader> m_reader; 81 }; 82 83 } // namespace blink 84 85 #endif 86
