retina_clear
retina_clear (ip, top, 0, bottom - top, ip->cols);
retina_clear (ip, top, 0, bottom - top, ip->cols);
retina_clear(ip, ip->bottom_margin + 1 - count, 0, count,
retina_clear(ip, sy, 0, count, ip->cols);
retina_clear(ip, sy, sx, 1, count);
retina_clear(ip, sy, ip->cols - count, 1, count);
void retina_clear(struct ite_softc *, int, int, int, int);
gp->g_iteclear = retina_clear;