* certain cases by optimized functions.
*****************************************************************************
* Copyright (C) 1999, 2000, 2001 VideoLAN
+ * $Id: transforms_yuv.c,v 1.4 2001/03/21 13:42:34 sam Exp $
*
* Authors: Vincent Seguin <ptyx@via.ecp.fr>
* Samuel Hocevar <sam@zoy.org>