gftfb_bitblt
gftfb_bitblt(sc, xs, y, xd, y, width, height, RopSrc);
gftfb_bitblt(sc, x, ys, x, yd, width, height, RopSrc);
static void gftfb_bitblt(void *, int, int, int, int, int,
sc->sc_gc.gc_bitblt = gftfb_bitblt;
gftfb_bitblt(sc, x, y, x, y, wi, he, RopInv);
gftfb_bitblt(sc, x, y, x, y, wi, he, RopInv);