66     $clip = $this->_clipping[0];
67     imagecopy($clip['image'],
69               $clip['box']->ll->x,
70               $clip['box']->ll->y,
71               $clip['box']->ll->x,
72               $clip['box']->ll->y,
73               $clip['box']->getWidth(),
74               $clip['box']->getHeight());
80     $this->_image = $clip['image'];
99     $clip = array('image' => $this->_image,
101     array_unshift($this->_clipping, $clip);
106     $width  = imagesx($clip['image']);
107     $height = imagesy($clip['image']);
111               $clip['image'],
250   function clip() {  function in OutputDriverPNG