macros.h

H.263的压缩算法

/************************************************************************
 *
 *  macros.h, part of tmn (TMN encoder)
 *
 *  Copyright (C) 1997  University of BC, Canada
 *
 *  Contacts: 
 *  Michael Gallant                   <[e-mail]>
 *  Guy Cote                          <[e-mail]>
 *  Berna Erol                        <[e-mail]>
 *
 *  UBC Image Processing Laboratory   http://www.ee.ubc.ca/image
 *  2356 Main Mall                    tel.: [phone]
 *  Vancouver BC Canada V6T1Z4        fax.: [phone]
 *
 *  Copyright (C) 1995, 1996  Telenor R&D, Norway
 *  
 *  Contacts: 
 *  Robert Danielsen                  <[e-mail]>
 *
 *  Telenor Research and Development  http://www.nta.no/brukere/DVC/
 *  P.O.Box 83                        tel.:   [phone]
 *  N-2007 Kjeller, Norway            fax.:   [phone]
 *
 ************************************************************************/

/*
 * Disclaimer of Warranty
 *
 * These software programs are available to the user without any
 * license fee or royalty on an "as is" basis. The University of
 * British Columbia disclaims any and all warranties, whether
 * express, implied, or statuary, including any implied warranties
 * or merchantability or of fitness for a particular purpose.  In no
 * event shall the copyright-holder be liable for any incidental,
 * punitive, or consequential damages of any kind whatsoever arising
 * from the use of these programs.
 *
 * This disclaimer of warranty extends to the user of these programs
 * and user's customers, employees, agents, transferees, successors,
 * and assigns.
 *
 * The University of British Columbia does not represent or warrant
 * that the programs furnished hereunder are free of infringement of
 * any third-party patents.
 *
 * Commercial implementations of H.263, including shareware, are
 * subject to royalty fees to patent holders.  Many of these patents
 * are general enough such that they are unavoidable regardless of
 * implementation design.
 *
*/



#define sign(a)        ((a) < 0 ? -1 : 1)
#define Int(a)          ((a) < 0 ? (int)(a-0.5) : (int)(a))
#define mnint(a)	((a) < 0 ? (int)(a - 0.5) : (int)(a + 0.5))
#define mfloor(a)       ((a) < 0 ? (int)(a - 0.5) : (int)(a))
#define mmax(a, b)        ((a) > (b) ? (a) : (b))
#define mmin(a, b)        ((a) < (b) ? (a) : (b))
#define limit(x) \
{ \
    if (x > 255) x = 255; \
    if (x <   0)   x = 0; \
}