void		set_pixel_color(SDL_Surface *s, int x, int y, unsigned int c)
{
  int		bpp;
  int		byte;
  unsigned char	*data;

  bpp = s->format->BytesPerPixel;
  data = (unsigned char *)(s->pixels) + y * s->pitch + x * bpp;
  byte = 0;
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
  while (byte < bpp)
  {
    data[byte] = c >> ((bpp - 1 - byte) * 8);
    byte++;
  }
#else
  while (byte < bpp)
  {
    data[byte] = c >> (byte * 8);
    byte++;
  }
#endif
  return ;
}