code: func CairoGlyphStringPath(cr *cairo.Context, font *Font, glyphs *GlyphString) {
  	C.pango_cairo_glyph_string_path(cairo_context(cr), font.native(), glyphs.native())
  }
docs: //void pango_cairo_show_error_underline (cairo_t       *cr,
  //				       double         x,
  //				       double         y,
  //				       double         width,
  //				       double         height);
  /*
   * Rendering to a path
   */
  //void pango_cairo_glyph_string_path (cairo_t          *cr,
  //				    PangoFont        *font,
  //				    PangoGlyphString *glyphs);