scale.h

symbian 下的helix player源代码

/* ***** BEGIN LICENSE BLOCK *****
 * Source last modified: $Id: scale.h,v 1.1.1.1.50.1 2004/07/09 02:00:18 hubbe Exp $
 * 
 * Portions Copyright (c) 1995-2004 RealNetworks, Inc. All Rights Reserved.
 * 
 * The contents of this file, and the files included with this file,
 * are subject to the current version of the RealNetworks Public
 * Source License (the "RPSL") available at
 * http://www.helixcommunity.org/content/rpsl unless you have licensed
 * the file under the current version of the RealNetworks Community
 * Source License (the "RCSL") available at
 * http://www.helixcommunity.org/content/rcsl, in which case the RCSL
 * will apply. You may also obtain the license terms directly from
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 * to this file, the RCSL.  Please see the applicable RPSL or RCSL for
 * the rights, obligations and limitations governing use of the
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 * 
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU General Public License Version 2 or later (the
 * "GPL") in which case the provisions of the GPL are applicable
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 * 
 * This file is part of the Helix DNA Technology. RealNetworks is the
 * developer of the Original Code and owns the copyrights in the
 * portions it created.
 * 
 * This file, and the files included with this file, is distributed
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 * 
 * Technology Compatibility Kit Test Suite(s) Location:
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 * Contributor(s):
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 * ***** END LICENSE BLOCK ***** */

#ifndef __SCALE_H__
#define __SCALE_H__   1

/*
 * Internal types of scale algorithms:
 *
 *  SHRINK          dest < src
 *  COPY            dest == src
 *  STRETCH         src < dest < 2 * src
 *  STRETCH2X       dest == 2 * src
 *  STRETCH2XPLUS   dest > 2 * src
 */
#define SHRINK_ID           0
#define COPY_ID             1
#define STRETCH_ID          2
#define STRETCH2X_ID        3
#define STRETCH2XPLUS_ID    4

#define SCALE_FUNCS         5

/*
 * Get type of scale algorithm
 */
#define GET_SCALE_TYPE(dest,src,scale)                      \
    {                                                       \
        scale = 1; /* COPY_ID */                            \
        if (dest != src) {                                  \
            if (dest < src)                                 \
                scale --; /* SHRINK_ID */                   \
            else {                                          \
                scale ++; /* STRETCH_ID */                  \
                if (dest >= 2 * src) {                      \
                    scale ++; /* STRETCH2X_ID */            \
                    if (dest > 2 * src)                     \
                        scale ++; /* STRETCH2XPLUS_ID */    \
                }                                           \
            }                                               \
        }                                                   \
    }

#endif /* __SCALE_H__ */