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31 #ifndef BMPImageDecoder_h
32 #define BMPImageDecoder_h
34 #include "platform/image-decoders/bmp/BMPImageReader.h"
35 #include "wtf/OwnPtr.h"
39 // This class decodes the BMP image format.
40 class PLATFORM_EXPORT BMPImageDecoder : public ImageDecoder {
42 BMPImageDecoder(ImageSource::AlphaOption, ImageSource::GammaAndColorProfileOption, size_t maxDecodedBytes);
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
52 virtual bool setFailed() OVERRIDE;
55 inline uint32_t readUint32(int offset) const
57 return BMPImageReader::readUint32(m_data.get(), m_decodedOffset + offset);
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);
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);
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);
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;
79 // The reader used to do most of the BMP decoding.
80 OwnPtr<BMPImageReader> m_reader;