utils.h

几种图像格式之间的转换

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#ifndef _UTILS_H_
#define _UTILS_H_

typedef unsigned char uchar;

struct PaletteEntry 
{
    unsigned char b, g, r, a;
};

#define WRITE_PIX( ptr, clr )     \
    (((uchar*)(ptr))[0] = (clr).b, \
     ((uchar*)(ptr))[1] = (clr).g, \
     ((uchar*)(ptr))[2] = (clr).r)

#define SWAP(a,b,t) ((t)=(a),(a)=(b),(b)=(t))

#define  descale(x,n)  (((x) + (1 << ((n)-1))) >> (n))
#define  saturate(x)   (uchar)(((x) & ~255) == 0 ? (x) : ~((x)>>31))

void  CvtBGRToGray( const uchar* bgr, uchar* gray, int len );
void  CvtRGBToGray( const uchar* rgb, uchar* gray, int len );
void  CvtRGBToBGR( const uchar* rgb, uchar* bgr, int len );
void  CvtBGRAToBGR( const uchar* bgra, uchar* bgr, int len );
void  CvtRGBAToBGR( const uchar* rgba, uchar* bgr, int len );
void  CvtBGRAToGray( const uchar* bgr, uchar* gray, int len );
void  CvtRGBAToGray( const uchar* bgr, uchar* gray, int len );

void  FillGrayPalette( PaletteEntry* palette, int bpp, bool negative = false );
bool  IsColorPalette( PaletteEntry* palette, int bpp );

void  CvtPaletteToGray( const PaletteEntry* palette, uchar* grayPalette, int entries );

uchar* FillUniColor( uchar* data, uchar*& line_end, int step, int width3,
                     int& y, int height, int count3, PaletteEntry clr );

uchar* FillUniGray( uchar* data, uchar*& line_end, int step, int width3,
                     int& y, int height, int count3, uchar clr );

uchar* FillColorRow8( uchar* data, uchar* indices, int len, PaletteEntry* palette );

uchar* FillGrayRow8( uchar* data, uchar* indices, int len, uchar* palette );

uchar* FillColorRow4( uchar* data, uchar* indices, int len, PaletteEntry* palette );

uchar* FillGrayRow4( uchar* data, uchar* indices, int len, uchar* palette );

uchar* FillColorRow1( uchar* data, uchar* indices, int len, PaletteEntry* palette );

uchar* FillGrayRow1( uchar* data, uchar* indices, int len, uchar* palette );

inline int myround( double x )
{
    static unsigned delta = 0x59c00000;
    x = (x + 1e-7) + (float&)delta;
    return (int&)x;
}

inline int myfloor( double x )
{
    static unsigned delta = 0x59c00000;
    x = (x - 0.4999999) + (float&)delta;
    return (int&)x;
}


inline int myceil( double x )
{
    static unsigned delta = 0x59c00000;
    x = (x + 0.4999999) + (float&)delta;
    return (int&)x;
}


#endif/*_UTILS_H_*/