udl_fb_line_write
int udl_fb_line_write(struct udl_softc *, uint16_t, uint32_t,
r = udl_fb_line_write(sc, rgb16, x, y + i, width);
sc->udl_fb_line_write = udl_fb_line_write;
sc->udl_fb_line_write = udl_fb_line_write_comp;
int (*udl_fb_line_write)