2 * Copyright (C) 2006 Apple Computer, Inc. All rights reserved.
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26 #ifndef PNGImageDecoder_h
27 #define PNGImageDecoder_h
29 #include "ImageDecoder.h"
30 #include <wtf/OwnPtr.h>
36 // This class decodes the PNG image format.
37 class PNGImageDecoder : public ImageDecoder {
39 PNGImageDecoder(ImageSource::AlphaOption, ImageSource::GammaAndColorProfileOption);
40 virtual ~PNGImageDecoder();
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
50 virtual bool setFailed();
52 // Callbacks from libpng
53 void headerAvailable();
54 void rowAvailable(unsigned char* rowBuffer, unsigned rowIndex, int interlacePass);
57 bool isComplete() const
59 return !m_frameBufferCache.isEmpty() && (m_frameBufferCache.first().status() == ImageFrame::FrameComplete);
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);
68 OwnPtr<PNGImageReader> m_reader;
69 bool m_doNothingOnFailure;
72 } // namespace WebCore