GBLENDER_VARS(blender,color);  int                   h        = blit->height;  const unsigned char*  src_line = blit->src_line;  unsigned char*        dst_line = blit->dst_line;  /* make compiler happy */  (r)=(r);  (g)=(g);  (b)=(b);  do  {    const unsigned char*  src = src_line + (blit->src_x);    unsigned char*        dst = dst_line + blit->dst_x*GDST_INCR;    int                   w   = blit->width;    do    {      int  a = GBLENDER_SHADE_INDEX(src[0]);      if ( a == 0 )      {        /* nothing */      }      else if ( a == GBLENDER_SHADE_COUNT )      {        GDST_COPY(dst);      }      else      {        GBlenderPixel  back;        GDST_READ(dst,back);        GBLENDER_LOOKUP( blender, back );#ifdef GBLENDER_STORE_BYTES        GDST_STOREB(dst,_gcells,a);#else        GDST_STOREP(dst,_gcells,a);#endif      }      src += 1;      dst += GDST_INCR;    }    while (--w > 0);    src_line += blit->src_pitch;    dst_line += blit->dst_pitch;  }  while (--h > 0);  GBLENDER_CLOSE(blender);