1,4,8,16,24,32位颜色之间的转换

//  灰度 .299R + .587G + .114B 
 #define  PIXEL_GREY(r,g,b) (u8)(((u16)r*77 + (u16)g*150 + (u16)b*29) >> 8) 
 
 //  获得 R5G6B5 红色分量 
 INLINE u8 R565( u16 clr )
 {
       return  (clr  &   0xF800 )  >>   8 ;
 } 
 
 //  获得 R5G6B5 绿色分量 
 INLINE u8 G565( u16 clr )
 {
        return  (clr  &   0x07E0 )  >>   3 ;
 } 
 
 //  获得 R5G6B5 蓝色分量 
 INLINE u8 B565( u16 clr )
 {
        return  (clr  &   0x001F )  <<   3 ;
 } 
 
 //  获得 A1R5G5B5 红色分量 
 INLINE u8 R1555( u16 clr )
 {
        return  (clr  &   0x7C00 )  >>   7 ;
 } 
 
 //  获得 A1R5G5B5 绿色分量 
 INLINE u8 G1555( u16 clr )
 {
        return  (clr  &   0x03E0 )  >>   2 ;
 } 
 
 //  获得 A1R5G5B5 蓝色分量 
 INLINE u8 B1555( u16 clr )
 {
        return  (clr  &   0x001F )  <<   3 ;
 } 
 
 //  获得 A1R5G5B5 Alpha值 
 INLINE u8 A1555( u16 clr )
 {
        return  clr  &   0x8000   ?   255  :  0 ;
 } 
 
 //  获得 A4R4G4B4 红色分量 
 INLINE u8 R4444( u16 clr )
 {
        return  (clr  &   0x0F00 )  >>   8 ;
 } 
 
 //  获得 A4R4G4B4 绿色分量 
 INLINE u8 G4444( u16 clr )
 {
        return  (clr  &   0x00F0 );
 } 
 
 //  获得 A4R4G4B4 蓝色分量 
 INLINE u8 B4444( u16 clr )
 {
        return  (clr  &   0xF000 )  <<   4 ;
 } 
 
 //  获得 A4R4G4B4 Alpha值 
 INLINE u8 A4444( u16 clr )
 {
        return  (clr  &   0xF000 )  >>   12 ;
 } 
 
 //  由rgb组合成一个32位的RGB 
 INLINE u32 RGB32( u8 r, u8 g, u8 b )
 {
        return  u32(r)  <<   16   |  u32(g)  <<   8   |  u32(b)  |   0xFF000000 ;
 } 
 
 //  由argb组合成一个32位的ARGB 
 INLINE u32 ARGB32( u8 a, u8 r, u8 g, u8 b )
 {
        return  u32(a)  <<   24   |  u32(r)  <<   16   |  u32(g)  <<   8   |  u32(b);
 } 
 
 // ------------------------------------------------------------------------------------
 //   1位转换到4, 8, 16, 24, 32
 // ------------------------------------------------------------------------------------ 
 INLINE u16 _1_to_565(  const  PALETTE  * pal, u16 index )
 {
        return  ( (pal[index].Blue >> 3 )  |  ((pal[index].Green >> 2 ) << 5 )  |  ((pal[index].Red >> 3 ) << 11 ) ); 
 } 
 
 INLINE u16 _1_to_1555(  const  PALETTE  * pal, u16 index )
 {
        return  ( (pal[index].Blue >> 3 )  |  ((pal[index].Green >> 3 ) << 5 )  |  ((pal[index].Red >> 3 ) << 10 )  |   0x8000  ); 
 } 
 
 INLINE u16 _1_to_4444(  const  PALETTE  * pal, u16 index )
 {
        return  ( (pal[index].Blue >> 4 )  |  ((pal[index].Green >> 4 ) << 4 )  |  ((pal[index].Red >> 4 ) << 8 )  |   0xF000  ); 
 } 
 
 INLINE  void  _1_to_24(  const  PALETTE  * pal, u16 index, u8  & r, u8  & g, u8  & b )
 {
       b  =  pal[index].Blue;
       g  =  pal[index].Green;
       r  =  pal[index].Red;
 } 
 
 INLINE u32 _1_to_32(  const  PALETTE  * pal, u16 index )
 {
        return  ( pal[index].Blue  |  (pal[index].Green  <<   8 )  |  (pal[index].Red  <<   16 ) );
 } 
 
 // ------------------------------------------------------------------------------------
 //   4位转换到1, 8, 16, 24, 32
 // ------------------------------------------------------------------------------------ 
 INLINE u16 _4_to_565(  const  PALETTE  * pal, u16 index )
 {
        return  ( (pal[index].Blue >> 3 )  |  ((pal[index].Green >> 2 ) << 5 )  |  ((pal[index].Red >> 3 ) << 11 ) ); 
 } 
 
 INLINE u16 _4_to_1555(  const  PALETTE  * pal, u16 index )
 {
        return  ( (pal[index].Blue >> 3 )  |  ((pal[index].Green >> 3 ) << 5 )  |  ((pal[index].Red >> 3 ) << 10 )  |   0x8000  ); 
 } 
 
 INLINE u16 _4_to_4444(  const  PALETTE  * pal, u16 index )
 {
        return  ( (pal[index].Blue >> 4 )  |  ((pal[index].Green >> 4 ) << 4 )  |  ((pal[index].Red >> 4 ) << 8 )  |   0xF000  ); 
 } 
 
 INLINE  void  _4_to_24(  const  PALETTE  * pal, u16 index, u8  & r, u8  & g, u8  & b )
 {
       b  =  pal[index].Blue;
       g  =  pal[index].Green;
       r  =  pal[index].Red;
 } 
 
 INLINE u32 _4_to_32(  const  PALETTE  * pal, u16 index )
 {
        return  ( pal[index].Blue  |  (pal[index].Green  <<   8 )  |  (pal[index].Red  <<   16 ) );
 } 
 
 // ------------------------------------------------------------------------------------
 //   8位转换到16，24，32
 // ------------------------------------------------------------------------------------ 
 INLINE u16 _8_to_565(  const  PALETTE  * pal, u16 index )
 {
        return  ( (pal[index].Blue >> 3 )  |  ((pal[index].Green >> 2 ) << 5 )  |  ((pal[index].Red >> 3 ) << 11 ) ); 
 } 
 
 INLINE u16 _8_to_1555(  const  PALETTE  * pal, u16 index )
 {
        return  ( (pal[index].Blue) >> 3   |  ((pal[index].Green >> 3 ) << 5 )  |  ((pal[index].Red >> 3 ) << 10 )  |   0x8000  );
 } 
 
 INLINE u16 _8_to_4444(  const  PALETTE  * pal, u16 index )
 {
        return  ( (pal[index].Blue >> 4 )  |  ((pal[index].Green >> 4 ) << 4 )  |  ((pal[index].Red >> 4 ) << 8 )  |   0xF000  );
 } 
 
 INLINE  void  _8_to_24(  const  PALETTE  * pal, u16 index, u8  & r, u8  & g, u8  & b )
 {
       b  =  pal[index].Blue;
       g  =  pal[index].Green;
       r  =  pal[index].Red;
 } 
 
 INLINE u32 _8_to_32(  const  PALETTE  * pal, u16 index )
 {
        return  ( pal[index].Blue  |  (pal[index].Green  <<   8 )  |  (pal[index].Red  <<   16 )  |   0xFF000000  );
 } 
 
 // ------------------------------------------------------------------------------------
 //   16位转换到8，24，32
 // ------------------------------------------------------------------------------------ 
 INLINE u8 _565_to_8( u16 clr )
 {
        return  PIXEL_GREY( (((clr  &   0xF800 )  >>   11 )  *   0xFF )  /   0x1F ,
            (((clr  &   0x7E0 )  >>   5 )  *   0xFF )  /   0x3F ,
            ((clr  &   0x1F )  *   0xFF )  /   0x1F  ); 
 } 
 
 INLINE u16 _565_to_1555( u16 clr )
 {
        return  ( (clr  &   0xF800 )  >>   1   |  (clr  >>   1 )  &   0x03E0   |  (clr  &   0x001F )  |   0x8000  );
 } 
 
 INLINE u16 _565_to_4444( u16 clr )
 {
        return  ( ((clr  &   0xF800 )  >>   4 )  |  ((clr  &   0x07E0 )  >>   3 )  |  ((clr  &   0x001F )  >>   1 )  |   0xF000  );
 } 
 
 INLINE  void  _565_to_24( u16 clr, u8  & r, u8  & g, u8  & b )
 {
       r  =  (u8)((clr  &   0xF800 )  >>   11 );
       g  =  (u8)((clr  &   0x07E0 )  >>   5 );
       b  =  (u8)((clr  &   0x001F )  <<   3 );
 } 
 
 INLINE u32 _565_to_32( u16 clr )
 {
        return ( ((clr  &   0x001F )  <<   3 )  |  ((clr  &   0x07E0 )  <<   5 )  |  ((clr  &   0xF800 )  <<   8 )  |   0xFF000000  );
 } 
 
 INLINE u8 _1555_to_8( u16 clr )
 {
        return  PIXEL_GREY( (((clr  &   0x7C00 )  >>   10 )  *   0xFF )  /   0x1F ,
            (((clr  &   0x3E0 )  >>   5 )  *   0xFF )  /   0x1F ,
            ((clr  &   0x1F )  *   0xFF )  /   0x1F  );
 } 
 
 INLINE u16 _1555_to_565( u16 clr )
 {
        return  (u16)( ((clr  &   0x7C00 ) << 1 )  |  ((clr  &   0x03E0 ) << 1 )  |  (clr  &   0x001F ) );
 } 
 
 INLINE u16 _1555_to_4444( u16 clr )
 {
        return  ( ((clr  &   0x7C00 )  >>   3 )  |  ((clr  &   0x03E0 )  >>   2 )  |  ((clr  &   0x001F )  >>   1 )  |   0xF000  );
 } 
 
 INLINE  void  _1555_to_24( u16 clr, u8  & r, u8  & g, u8  & b )
 {
       r  =  (u8)((clr  &   0x7C00 )  >>   10 );
       g  =  (u8)((clr  &   0x03E0 )  >>   5 );
       b  =  (u8)((clr  &   0x001F )  <<   3 );
 } 
 
 INLINE u32 _1555_to_32( u16 clr )
 {
        return ( ((clr  &   0x001F )  <<   3 )  |  ((clr  &   0x03E0 )  <<   6 )  |  ((clr  &   0x7C00 )  <<   9 )  |   0xFF000000  );
 } 
 
 INLINE u16 _4444_to_565( u16 clr )
 {
        return  ( ((clr  &   0x000F )  <<   1 )  |  ((clr  &   0x00F0 )  <<   3 )  |  ((clr  &   0x0F00 )  <<   4 ) );
 } 
 
 INLINE u16 _4444_to_1555( u16 clr )
 {
        return  ( ((clr  &   0x000F )  <<   1 )  |  ((clr  &   0x00F0 )  <<   2 )  |  ((clr  &   0x0F00 )  <<   3 )  |   0x8000  );
 } 
 
 INLINE  void  _4444_to_24( u16 clr, u8  & r, u8  & g, u8  & b )
 {
       r  =  (u8)((clr  &   0x0F00 )  >>   8 );
       g  =  (u8)((clr  &   0x00F0 )  >>   4 );
       b  =  (u8)((clr  &   0x000F )  <<   4 );
 } 
 
 INLINE u32 _4444_to_32( u16 clr )
 {
        return  ( ((clr  &   0x000F )  <<   4 )  |  ((clr  &   0x00F0 )  <<   8 )  |  ((clr  &   0x0F00 )  <<   12 )  |  ((clr  &   0xF000 )  <<   16 ) );
 } 
 
 // ------------------------------------------------------------------------------------
 //   24位转换到8，16，32
 // ------------------------------------------------------------------------------------ 
 INLINE u8 _24_to_8( u8 r, u8 g, u8 b )
 {
        return  PIXEL_GREY( b, g, r );
 } 
 
 INLINE u16 _24_to_565( u8 r, u8 g, u8 b )
 {
        return  ( ((u16)(r >> 3 ) << 11 )  |  ((u16)(g >> 2 ) << 5 )  |  ((u16)b >> 3 ) );
 } 
 
 INLINE u16 _24_to_1555( u8 r, u8 g, u8 b )
 {
        return  (  0x8000   |  ((u16)(r >> 3 ) << 10 )  |  ((u16)(g >> 3 ) << 5 )  |  ((u16)b >> 3 ) ); 
 } 
 
 INLINE u16 _24_to_4444( u8 r, u8 g, u8 b )
 {
        return  (  0xF000   |  ((u16)(r >> 4 ) << 8 )  |  ((u16)(g >> 4 ) << 4 )  |  ((u16)b >> 4 ) ); 
 } 
 
 INLINE u32 _24_to_32( u8 r, u8 g, u8 b )
 {
        return  (  0xFF000000   |  ((u16)r  <<   16 )  |  ((u16)g  <<   8 )  |  (u16)b );
 } 
 
 // ------------------------------------------------------------------------------------
 //   32位转换到8，16，24
 // ------------------------------------------------------------------------------------ 
 INLINE u8 _32_to_8( u32 clr )
 {
        return  PIXEL_GREY( (clr  &   0xFF ), ((clr  &   0xFF00 )  >>   8 ), ((clr  &   0xFF0000 )  >>   16 ) );
 } 
 
 INLINE u16 _32_to_565( u32 clr )
 {
        return  (u16)( ((clr  &   0xF8 )  >>   3 )  |  ((clr  &   0xFC00 )  >>   5 )  |  ((clr  &   0xF80000 )  >>   8 ) );
 } 
 
 INLINE u16 _32_to_1555( u32 clr )
 {
        return  (u16)( ((clr  &   0xF8 )  >>   3 )  |  ((clr  &   0xF800 )  >>   6 )  |  ((clr  &   0xF80000 )  >>   9 )  |   0x8000  );
 } 
 
 INLINE u16 _32_to_4444( u32 clr )
 {
        return  (u16)( ((clr  &   0xF0 )  >>   4 )  |  ((clr  &   0xF000 )  >>   8 )  |  ((clr  &   0xF00000 )  >>   12 )  |  ((clr  &   0xF0000000 )  >>   16 ) );
 } 
 
 INLINE  void   _32_to_24( u32 clr, u8  & r, u8  & g, u8  & b )
 {
       b  =  (u8)(clr  &   0xFF );
       g  =  (u8)((clr  &   0xFF00 )  >>   8 );
       r  =  (u8)((clr  &   0xFF0000 )  >>   16 );
 }