code: func (v *Image) SetFromIconName(iconName string, size IconSize) {
  	cstr := C.CString(iconName)
  	defer C.free(unsafe.Pointer(cstr))
  	C.gtk_image_set_from_icon_name(v.native(), (*C.gchar)(cstr),
  		C.GtkIconSize(size))
  }
docs: // TODO(jrick) GtkIconSet
  /*
  func (v *Image) SetFromIconSet() {
  }
  */
  // TODO(jrick) GdkPixbufAnimation
  /*
  func (v *Image) SetFromAnimation() {
  }
  */
  // SetFromIconName() is a wrapper around gtk_image_set_from_icon_name().