Get the RECT structure.

def _get_struct_rect(self):
        """Get the RECT structure."""
        bc = BitConsumer(self._src)
        nbits = bc.u_get(5)
        if self._read_twips:
            return tuple(bc.s_get(nbits) for _ in range(4))
        else:
            return tuple(bc.s_get(nbits) / 20.0 for _ in range(4))