pub async fn create_pixmap<Conn>(
    conn: &Conn,
    pid: Pixmap,
    drawable: Drawable,
    width: u16,
    height: u16,
    depth: u8,
    shmseg: Seg,
    offset: u32
) -> Result<VoidCookie<'_, Conn>, ConnectionError>where
    Conn: RequestConnection + ?Sized,