code: func (v *StyleContext) LookupColor(colorName string) (*gdk.RGBA, bool) {
  	cstr := (*C.gchar)(C.CString(colorName))
  	defer C.free(unsafe.Pointer(cstr))
  	gdkColor := gdk.NewRGBA()
  	ret := C.gtk_style_context_lookup_color(v.native(), cstr, (*C.GdkRGBA)(unsafe.Pointer(gdkColor.Native())))
  	return gdkColor, gobool(ret)
  }
docs: // LookupColor is a wrapper around gtk_style_context_lookup_color().