mach64_bitblt
mach64_bitblt(sc, x, y, x, y, wi, he, MIX_NOT_SRC);
mach64_bitblt(sc, x, y, x, y, wi, he, MIX_NOT_SRC);
mach64_bitblt(sc, xs, y, xd, y, width, height, MIX_SRC);
mach64_bitblt(sc, x, ys, x, yd, width, height, MIX_SRC);
static void mach64_bitblt(void *, int, int, int, int, int, int, int);
sc->sc_gc.gc_bitblt = mach64_bitblt;