add_pixels_clamped(data, dest, line_size);
mlib_VideoAddBlock_U8_S16(dest, (mlib_s16 *)data, line_size);
static void ff_idct_add_mlib(UINT8 *dest, int line_size, DCTELEM *data){    mlib_VideoIDCT8x8_S16_S16 (data, data);    add_pixels_clamped(data, dest, line_size);}