cairo_surface_t	*generic_src, cairo_surface_t	*generic_mask,
cairo_pattern_t	*src, cairo_pattern_t	*mask,
_cairo_png_surface_composite (cairo_operator_t	operator,			      cairo_surface_t	*generic_src,			      cairo_surface_t	*generic_mask,			      void		*abstract_dst,			      int		src_x,			      int		src_y,			      int		mask_x,			      int		mask_y,			      int		dst_x,			      int		dst_y,			      unsigned int	width,			      unsigned int	height){    return CAIRO_INT_STATUS_UNSUPPORTED;}