/* Swap two points p1 pointer to the first point p2 pointer to the second point  */
static void point_swap(lv_point_t *p1, lv_point_t *p2)
/* Swap two points p1 pointer to the first point p2 pointer to the second point  */
static void point_swap(lv_point_t *p1, lv_point_t *p2)
{
    lv_point_t tmp;
    tmp.x = p1->x;
    tmp.y = p1->y;
    p1->x = p2->x;
    p1->y = p2->y;
    p2->x = tmp.x;
    p2->y = tmp.y;
}