pub fn composite<Conn, A>(
conn: &Conn,
op: PictOp,
src: Picture,
mask: A,
dst: Picture,
src_x: i16,
src_y: i16,
mask_x: i16,
mask_y: i16,
dst_x: i16,
dst_y: i16,
width: u16,
height: u16
) -> Result<VoidCookie<'_, Conn>, ConnectionError>