C语言颜色转换宏

#define COLOR_BPP16_RGB555

/* Win RGB */

#define COLOR_RGB(r,g,b) ((COLORREF)(((BYTE)(r)|((WORD)((BYTE)(g))<<8))|(((DWORD)(BYTE)(b))<<16)))

#define COLOR_RGBA(r,g,b,a) ((COLORREF)((((DWORD)(BYTE)(a))<<24)|COLOR_RGB(r,g,b)))

/* Win PALETTERGB */

#define COLOR_PALRGB(r,g,b) (0x02000000 | COLOR_RGB(r,g,b))

/* Win PALETTEINDEX */

#define COLOR_PALINDEX(i) ((COLORREF)(0x01000000 | (DWORD)(WORD)(i)))

/* Win GetRValue */

#define COLOR_GET_RED(rgb) ((BYTE)(((DWORD)(rgb)) & 0xff))

/* Win GetGValue */

#define COLOR_GET_GREEN(rgb) ((BYTE)(((DWORD)(((WORD)(rgb)) >> 8)) & 0xff))

/* Win GetBValue */

#define COLOR_GET_BLUE(rgb) ((BYTE)(((DWORD)((rgb)>>16)) & 0xff))

#define COLOR_GET_ALPHA(rgba) ((BYTE)(((DWORD)((rgba)>>24)) & 0xff))

/*

* 24 bits color <=> 16 bits color

*/

#define RGB888toRGB565(r,g,b) ((WORD)((((WORD)(r)<<8)&0xF800)|((((WORD)(g))<<3)&0x7E0)|(((WORD)(b))>>3)))

#define RGBtoRGB565(rgb) ((WORD)(((((WORD)((rgb)>>3))&(0x1F))<<11)|((((WORD)((rgb)>>10))&(0x3F))<<5)|(((WORD)((rgb)>>19))&(0x1F))))

#define RGB888toRGB555(r,g,b) ((WORD)(((((WORD)(r))<<7)&0x7C00)|((((WORD)(g))<<2)&0x3E0)|(((WORD)(b))>>3)))

#define RGBtoRGB555(rgb) ((WORD)(((((WORD)((rgb)>>3))&(0x1F))<<10)|((((WORD)((rgb)>>11))&(0x1F))<<5)|(((WORD)((rgb)>>19))&(0x1F))))

#define RGB555toRGB(rgb555) ((DWORD)(((BYTE)(((rgb555)>>7)&0xF8)|((WORD)((BYTE)(((rgb555)>>2)&0xF8))<<8))|(((DWORD)(BYTE)(((rgb555)<<3)&0xF8))<<16)))

#define RGB565toRGB(rgb565) ((DWORD)(((BYTE)((((rgb565)&0xF800)>>11)<<3)|((WORD)((BYTE)((((rgb565)&0x07E0)>>5)<<2))<<8))|(((DWORD)(BYTE)(((rgb565)&0x001F)<<3))<<16)))

#ifdef COLOR_BPP16_RGB555

#define BPP24toBPP16 RGB888toRGB555

#define BPP16toBPP24 RGB555toRGB

#else

#define BPP24toBPP16 RGB888toRGB565

#define BPP16toBPP24 RGB565toRGB

#endif

原文：http://blog.csdn.net/ubuntu64fan/article/details/41985805