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/src/FreeImage/Source/LibOpenJPEG/fix.h

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C++ Header | 64 lines | 13 code | 6 blank | 45 comment | 1 complexity | 1ed0d0553a647a83d105482a6a669230 MD5 | raw file
 1/*
 2 * Copyright (c) 2002-2007, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium
 3 * Copyright (c) 2002-2007, Professor Benoit Macq
 4 * Copyright (c) 2001-2003, David Janssens
 5 * Copyright (c) 2002-2003, Yannick Verschueren
 6 * Copyright (c) 2003-2007, Francois-Olivier Devaux and Antonin Descampe
 7 * Copyright (c) 2005, Herve Drolon, FreeImage Team
 8 * All rights reserved.
 9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
20 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
23 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31#ifndef __FIX_H
32#define __FIX_H
33
34#if defined(_MSC_VER) || defined(__BORLANDC__)
35#define int64 __int64
36#else
37#define int64 long long
38#endif
39
40/**
41@file fix.h
42@brief Implementation of operations of specific multiplication (FIX)
43
44The functions in FIX.H have for goal to realize specific multiplication.
45*/
46
47/** @defgroup FIX FIX - Implementation of operations of specific multiplication */
48/*@{*/
49
50/**
51Multiply two fixed-precision rational numbers.
52@param a
53@param b
54@return Returns a * b
55*/
56static INLINE int fix_mul(int a, int b) {
57    int64 temp = (int64) a * (int64) b ;
58    temp += temp & 4096;
59    return (int) (temp >> 13) ;
60}
61
62/*@}*/
63
64#endif /* __FIX_H */