/* Clears a calibration point from the given buffer.  */
static void clear_calibration_point(const rtouch_point_t *p_point)
/* Clears a calibration point from the given buffer.  */
static void clear_calibration_point(const rtouch_point_t *p_point)
{
	gfx_draw_filled_rect(p_point->x - POINTS_SIZE / 2,
			p_point->y - POINTS_SIZE / 2,
			POINTS_SIZE,
			POINTS_SIZE,
			BGCOLOR
	);
}