wcfb_rop_jfb
static void wcfb_rop_jfb(struct wcfb_softc *, int, int, int, int, int, int,
wcfb_rop_jfb(sc, 0, 0, 0, 0, 600, 600, WC_ROP_SET, 0xffffffff);
wcfb_rop_jfb(sc, sx, sy, dx, dy, w, h, rop, 0x0f);
wcfb_rop_jfb(sc, x, y, x, y, w, h, WC_ROP_CLEAR, 0xffffffff);
wcfb_rop_jfb(sc, x, y, x, y, w, h, WC_ROP_SET, mask);