et_clear
gp->g_iteclear = et_clear;
void et_clear(struct ite_softc *ip, int sy, int sx, int h, int w);
sc->g_iteclear = et_clear;
et_clear(ip, 0, 0, ip->rows, ip->cols);
void et_clear(struct ite_softc *ip, int sy, int sx, int h, int w);