zzfb_rectfill
static void zzfb_rectfill(struct zzfb_softc *sc, uint16_t x, uint16_t y,
zzfb_rectfill(sc, 0, 0, sc->sc_width, sc->sc_height, palette);
zzfb_rectfill(sc, x, y, w, h, ri->ri_devcmap[bg]);
zzfb_rectfill(sc, x, y, w, h, ri->ri_devcmap[bg & 0xf]);