func (v *Pixbuf) GetOption(key string) (value string, ok bool) {
	cstr := C.CString(key)
	defer C.free(unsafe.Pointer(cstr))
	c := C.gdk_pixbuf_get_option(v.native(), (*C.gchar)(cstr))
	if c == nil {
		return "", false
	}
	return C.GoString((*C.char)(c)), true
}
func (v *Pixbuf) GetOption(key string) (value string, ok bool) {
	cstr := C.CString(key)
	defer C.free(unsafe.Pointer(cstr))
	c := C.gdk_pixbuf_get_option(v.native(), (*C.gchar)(cstr))
	if c == nil {
		return "", false
	}
	return C.GoString((*C.char)(c)), true
}
// GetOption is a wrapper around gdk_pixbuf_get_option().  ok is true if
// the key has an associated value.