code: func CairoShowGlyphItem(cr *cairo.Context, text string, glyph_item *GlyphItem) {
  	cstr := C.CString(text)
  	defer C.free(unsafe.Pointer(cstr))
  	C.pango_cairo_show_glyph_item(cairo_context(cr), (*C.char)(cstr), glyph_item.native())
  }
docs: //void pango_cairo_show_glyph_item   (cairo_t          *cr,
  //				    const char       *text,
  //				    PangoGlyphItem   *glyph_item);