image.py 文件源码

def _init_polygon_mask(self, polygon_mask):
        """Sets the polygon mask taking into account parent and passed mask"""
        parent_pmask = self._parent_polygon_mask(do_translate=True)

        if polygon_mask is not None and parent_pmask is not None:
            self._polygon_mask = polygon_mask.intersection(parent_pmask)
        elif polygon_mask is not None:
            self._polygon_mask = polygon_mask
        elif parent_pmask is not None:
            self._polygon_mask = box(0, 0, self.width, self.height).intersection(parent_pmask)
        else:
            self._polygon_mask = None