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 "platform/image-decoders/ImageDecoder.h" 30#include "wtf/Noncopyable.h" 31#include "wtf/OwnPtr.h" 32 33namespace blink { 34 35class PNGImageReader; 36 37// This class decodes the PNG image format. 38class PLATFORM_EXPORT PNGImageDecoder : public ImageDecoder { 39 WTF_MAKE_NONCOPYABLE(PNGImageDecoder); 40public: 41 PNGImageDecoder(ImageSource::AlphaOption, ImageSource::GammaAndColorProfileOption, size_t maxDecodedBytes); 42 virtual ~PNGImageDecoder(); 43 44 // ImageDecoder 45 virtual String filenameExtension() const OVERRIDE { return "png"; } 46 virtual bool isSizeAvailable() OVERRIDE; 47 virtual bool hasColorProfile() const OVERRIDE { return m_hasColorProfile; } 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 // PNGImageReader! 52 virtual bool setFailed() OVERRIDE; 53 54 // Callbacks from libpng 55 void headerAvailable(); 56 void rowAvailable(unsigned char* rowBuffer, unsigned rowIndex, int interlacePass); 57 void pngComplete(); 58 59 bool isComplete() const 60 { 61 return !m_frameBufferCache.isEmpty() && (m_frameBufferCache.first().status() == ImageFrame::FrameComplete); 62 } 63 64private: 65 // Decodes the image. If |onlySize| is true, stops decoding after 66 // calculating the image size. If decoding fails but there is no more 67 // data coming, sets the "decode failure" flag. 68 void decode(bool onlySize); 69 70 OwnPtr<PNGImageReader> m_reader; 71 bool m_doNothingOnFailure; 72 bool m_hasColorProfile; 73}; 74 75} // namespace blink 76 77#endif 78