docs: def new(cls, pic_id, filename, rId, cx, cy):
          """
          Return a new ``<pic:pic>`` element populated with the minimal
          contents required to define a viable picture element, based on the
          values passed as parameters.
          """
          pic = parse_xml(cls._pic_xml())
          pic.nvPicPr.cNvPr.id = pic_id
          pic.nvPicPr.cNvPr.name = filename
          pic.blipFill.blip.embed = rId
          pic.spPr.cx = cx
          pic.spPr.cy = cy
          return pic