void
warp(const Client *c)
{
	int x, y;

	if (!c) {
		XWarpPointer(dpy, None, root, 0, 0, 0, 0, selmon->wx + selmon->ww/2, selmon->wy + selmon->wh/2);
		return;
	}

	if (!getrootptr(&x, &y) ||
	    (x > c->x - c->bw &&
	     y > c->y - c->bw &&
	     x < c->x + c->w + c->bw*2 &&
	     y < c->y + c->h + c->bw*2) ||
	    (y > c->mon->by && y < c->mon->by + bh) ||
	    (c->mon->topbar && !y))
		return;

	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w / 2, c->h / 2);
}