1 /* 2 * Copyright (C) 2006 Apple Computer, 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 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #ifndef PNGImageDecoder_h 27 #define PNGImageDecoder_h 28 29 #include "ImageDecoder.h" 30 #include <wtf/OwnPtr.h> 31 32 namespace WebCore { 33 34 class PNGImageReader; 35 36 // This class decodes the PNG image format. 37 class PNGImageDecoder : public ImageDecoder { 38 public: 39 PNGImageDecoder(ImageSource::AlphaOption, ImageSource::GammaAndColorProfileOption); 40 virtual ~PNGImageDecoder(); 41 42 // ImageDecoder filenameExtension()43 virtual String filenameExtension() const { return "png"; } 44 virtual bool isSizeAvailable(); 45 virtual bool setSize(unsigned width, unsigned height); 46 virtual ImageFrame* frameBufferAtIndex(size_t index); 47 // CAUTION: setFailed() deletes |m_reader|. Be careful to avoid 48 // accessing deleted memory, especially when calling this from inside 49 // PNGImageReader! 50 virtual bool setFailed(); 51 52 // Callbacks from libpng 53 void headerAvailable(); 54 void rowAvailable(unsigned char* rowBuffer, unsigned rowIndex, int interlacePass); 55 void pngComplete(); 56 isComplete()57 bool isComplete() const 58 { 59 return !m_frameBufferCache.isEmpty() && (m_frameBufferCache.first().status() == ImageFrame::FrameComplete); 60 } 61 62 private: 63 // Decodes the image. If |onlySize| is true, stops decoding after 64 // calculating the image size. If decoding fails but there is no more 65 // data coming, sets the "decode failure" flag. 66 void decode(bool onlySize); 67 68 OwnPtr<PNGImageReader> m_reader; 69 bool m_doNothingOnFailure; 70 }; 71 72 } // namespace WebCore 73 74 #endif 75