public extern static void hb_font_funcs_set_glyph_contour_point_func(hb_font_funcs_t ffuncs, GlyphContourPointProxyDelegate func, IntPtr user_data, hb_destroy_func_t destroy);
public extern static void hb_font_funcs_set_glyph_contour_point_func(IntPtr ffuncs, GlyphContourPointProxyDelegate func, IntPtr user_data, ReleaseDelegateProxyDelegate destroy);