照片处理-阿宝色滤镜

 static int  f_Filter512(unsigned  char*  srcData,  int  width  ,int  height,  int  stride,  unsigned  char*Map)
{
    int  i,  j,  r,  g,  b,  offset,  pos,  nx,  ny,  k;
    unsigned  char*  pSrc  =  srcData;
    offset  =  stride  -  (width * 4);
    // 循环遍历原始图片像素
    for(j  =  0;  j  <  height;  j++)
    {
        for(i  =  0;  i  <  width;  i++)
        {
            b  =  pSrc[0];
            g  =  pSrc[1];
            r  =  pSrc[2];
            
            // 按照3D LUT规则，进行查表
            k  =  (b  >>  2);
            nx  =  (int)(r  >>  2)  +  ((k  -  ((k  >>  3)  <<  3))  <<  6);
            ny  =  (int)(((b  >>  5)  <<  6)  +  (g  >>  2));
            pos  =  (nx * 4)  +  (ny * 512 * 4);
            pSrc[0]  =  Map[pos];
            pSrc[1]  =  Map[pos  +  1];
            pSrc[2]  =  Map[pos  +  2]; 
            pSrc  +=  4;
        }
        pSrc  +=  offset;
    }
    return    0;
};