pp->spriteys = MAX (pp->ys + (pp->ys >> 1) - 1, 1);
pp->spritedx = (pp->xs - pp->spritexs) >> 1;
pp->spritedy = (pp->ys - pp->spriteys) >> 1;
pp->spriteys = MAX (pp->ys + (pp->ys >> 1) - 1, 1);
pp->spritedx = (pp->xs - pp->spritexs) >> 1;
pp->spritedy = (pp->ys - pp->spriteys) >> 1;