snippet_normalize (cr, width, height)

cr.arc (0.5, 0.5, 0.3, 0, 2 * M_PI)
cr.clip ()

cr.rectangle (0, 0, 1, 1)
cr.fill ()
cr.set_source_rgb (0, 1, 0)
cr.move_to (0, 0)
cr.line_to (1, 1)
cr.move_to (1, 0)
cr.line_to (0, 1)
cr.stroke ()