gffb_bitblt
gffb_bitblt(sc, x, y, x, y, wi, he, 0x33);
gffb_bitblt(sc, x, y, x, y, wi, he, 0x33);
static void gffb_bitblt(void *, int, int, int, int, int, int, int);
gffb_bitblt(sc, xs, y, xd, y, width, height, 0xcc);
gffb_bitblt(sc, x, ys, x, yd, width, height, 0xcc);
sc->sc_gc.gc_bitblt = gffb_bitblt;