otherlibs/highgui/grfmt_jpeg.h

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#ifndef _GRFMT_JPEG_H_
#define _GRFMT_JPEG_H_

#include "grfmt_base.h"
#include "bitstrm.h"

#ifdef HAVE_JPEG

/* IJG-based version */

class GrFmtJpegReader : public GrFmtReader
{
public:
    
    GrFmtJpegReader( const char* filename );
    ~GrFmtJpegReader();

    bool  ReadData( uchar* data, int step, int color );
    bool  ReadHeader();
    void  Close();

protected:

    void* m_cinfo; // pointer to IJG JPEG codec structure
    void* m_jerr; // pointer to error processing manager state
    FILE* m_f;
};


class GrFmtJpegWriter : public GrFmtWriter
{
public:
    
    GrFmtJpegWriter( const char* filename );
    ~GrFmtJpegWriter();

    bool  WriteImage( const uchar* data, int step,
                      int width, int height, int depth, int channels );
};

#else

/* hand-crafted implementation */

class RJpegBitStream : public RMBitStream
{
public:
    RMByteStream  m_low_strm;
    
    RJpegBitStream();
    ~RJpegBitStream();

    virtual bool  Open( const char* filename );
    virtual void  Close();

    void  Flush(); // flushes high-level bit stream
    void  AlignOnByte();
    int   FindMarker();

protected:
    virtual void  ReadBlock();
};


//////////////////// JPEG reader /////////////////////

class GrFmtJpegReader : public GrFmtReader
{
public:
    
    GrFmtJpegReader( const char* filename );
    ~GrFmtJpegReader();

    bool  ReadData( uchar* data, int step, int color );
    bool  ReadHeader();
    void  Close();

protected:

    int   m_offset; // offset of first scan
    int   m_version; // JFIF version
    int   m_planes; // 3 (YCrCb) or 1 (Gray)
    int   m_precision; // 8 or 12-bit per sample
    int   m_type; // SOF type
    int   m_MCUs; // MCUs in restart interval
    int   m_ss, m_se, m_ah, m_al; // progressive JPEG parameters
    
    // information about each component
    struct cmp_info
    {
        char h;  // horizontal sampling factor
        char v;  // vertical   sampling factor
        char tq; // quantization table index
        char td, ta; // DC & AC huffman tables
        int  dc_pred; // DC predictor
    };
    
    cmp_info m_ci[3];

    int     m_tq[4][64];
    bool    m_is_tq[4];
    
    short*  m_td[4];
    bool    m_is_td[4];
    
    short*  m_ta[4];
    bool    m_is_ta[4];
    
    RJpegBitStream  m_strm;

protected:

    bool  LoadQuantTables( int length );
    bool  LoadHuffmanTables( int length );
    void  ProcessScan( int* idx, int ns, uchar* data, int step, int color );
    void  ResetDecoder();
    void  GetBlock( int* block, int c );
};


//////////////////// JPEG-specific output bitstream ///////////////////////

class WJpegBitStream : public WMBitStream
{
public:
    WMByteStream  m_low_strm;
    
    WJpegBitStream();
    ~WJpegBitStream();

    virtual void  Flush();
    virtual bool  Open( const char* filename );
    virtual void  Close();

protected:
    virtual void  WriteBlock();
};


//////////////////// JPEG reader /////////////////////

class GrFmtJpegWriter : public GrFmtWriter
{
public:
    
    GrFmtJpegWriter( const char* filename );
    ~GrFmtJpegWriter();

    bool  WriteImage( const uchar* data, int step,
                      int width, int height, int depth, int channels );

protected:

    WJpegBitStream  m_strm;
};

#endif /* HAVE_JPEG */


// JPEG filter factory
class GrFmtJpeg : public GrFmtFilterFactory
{
public:
    
    GrFmtJpeg();
    ~GrFmtJpeg();

    GrFmtReader* NewReader( const char* filename );
    GrFmtWriter* NewWriter( const char* filename );
};


#endif/*_GRFMT_JPEG_H_*/