SFBPIXELBYTES
p = ri->ri_bits + y * scanspan + x * SFBPIXELBYTES;
align /= SFBPIXELBYTES;
p = ri->ri_bits + y * scanspan + startx * SFBPIXELBYTES;
align /= SFBPIXELBYTES;
align /= SFBPIXELBYTES;
align /= SFBPIXELBYTES;
w = ri->ri_emuwidth * SFBPIXELBYTES;