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#ifndef BMPImageDecoder_h
#define BMPImageDecoder_h
#include "platform/image-decoders/bmp/BMPImageReader.h"
#include "wtf/OwnPtr.h"
namespace WebCore {
// This class decodes the BMP image format.
class PLATFORM_EXPORT BMPImageDecoder : public ImageDecoder {
public:
BMPImageDecoder(ImageSource::AlphaOption, ImageSource::GammaAndColorProfileOption, size_t maxDecodedBytes);
// ImageDecoder
virtual String filenameExtension() const OVERRIDE { return "bmp"; }
virtual void setData(SharedBuffer*, bool allDataReceived) OVERRIDE;
virtual bool isSizeAvailable() OVERRIDE;
virtual ImageFrame* frameBufferAtIndex(size_t) OVERRIDE;
// CAUTION: setFailed() deletes |m_reader|. Be careful to avoid
// accessing deleted memory, especially when calling this from inside
// BMPImageReader!
virtual bool setFailed() OVERRIDE;
private:
inline uint32_t readUint32(int offset) const
{
return BMPImageReader::readUint32(m_data.get(), m_decodedOffset + offset);
}
// Decodes the image. If |onlySize| is true, stops decoding after
// calculating the image size. If decoding fails but there is no more
// data coming, sets the "decode failure" flag.
void decode(bool onlySize);
// Decodes the image. If |onlySize| is true, stops decoding after
// calculating the image size. Returns whether decoding succeeded.
bool decodeHelper(bool onlySize);
// Processes the file header at the beginning of the data. Sets
// |*imgDataOffset| based on the header contents. Returns true if the
// file header could be decoded.
bool processFileHeader(size_t* imgDataOffset);
// An index into |m_data| representing how much we've already decoded.
// Note that this only tracks data _this_ class decodes; once the
// BMPImageReader takes over this will not be updated further.
size_t m_decodedOffset;
// The reader used to do most of the BMP decoding.
OwnPtr<BMPImageReader> m_reader;
};
} // namespace WebCore
#endif