pub fn alloc_color_planes<Conn>(
    conn: &Conn,
    contiguous: bool,
    cmap: Colormap,
    colors: u16,
    reds: u16,
    greens: u16,
    blues: u16
) -> Result<Cookie<'_, Conn, AllocColorPlanesReply>, ConnectionError>
where Conn: RequestConnection + ?Sized,