`draw_path_collection`, with the exception of *path_ids*, which is a
        list of arbitrary objects that the backend will use to reference one of
        the paths created in the `_iter_collection_raw_paths` stage.

        Each yielded result is of the form::

           xo, yo, path_id, gc, rgbFace

        where *xo*, *yo* is an offset; *path_id* is one of the elements of
        *path_ids*; *gc* is a graphics context and *rgbFace* is a color to
        use for filling the path.
        r