forked from KolibriOS/kolibrios
65 lines
2.3 KiB
C
65 lines
2.3 KiB
C
|
/*
|
||
|
|
* Copyright (c) 2002-2007, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium
|
||
|
|
* Copyright (c) 2002-2007, Professor Benoit Macq
|
||
|
|
* Copyright (c) 2001-2003, David Janssens
|
||
|
|
* Copyright (c) 2002-2003, Yannick Verschueren
|
||
|
|
* Copyright (c) 2003-2007, Francois-Olivier Devaux and Antonin Descampe
|
||
|
|
* Copyright (c) 2005, Herve Drolon, FreeImage Team
|
||
|
|
* All rights reserved.
|
||
|
|
*
|
||
|
|
* Redistribution and use in source and binary forms, with or without
|
||
|
|
* modification, are permitted provided that the following conditions
|
||
|
|
* are met:
|
||
|
|
* 1. Redistributions of source code must retain the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer.
|
||
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer in the
|
||
|
|
* documentation and/or other materials provided with the distribution.
|
||
|
|
*
|
||
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
|
||
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
||
|
|
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
||
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
||
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
||
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
||
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
||
|
|
*/
|
||
|
|
#ifndef __FIX_H
|
||
|
|
#define __FIX_H
|
||
|
|
|
||
|
|
#if defined(_MSC_VER) || defined(__BORLANDC__)
|
||
|
|
#define int64 __int64
|
||
|
|
#else
|
||
|
|
#define int64 long long
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/**
|
||
|
|
@file fix.h
|
||
|
|
@brief Implementation of operations of specific multiplication (FIX)
|
||
|
|
|
||
|
|
The functions in FIX.H have for goal to realize specific multiplication.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/** @defgroup FIX FIX - Implementation of operations of specific multiplication */
|
||
|
|
/*@{*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
Multiply two fixed-precision rational numbers.
|
||
|
|
@param a
|
||
|
|
@param b
|
||
|
|
@return Returns a * b
|
||
|
|
*/
|
||
|
|
static INLINE int fix_mul(int a, int b) {
|
||
|
|
int64 temp = (int64) a * (int64) b ;
|
||
|
|
temp += temp & 4096;
|
||
|
|
return (int) (temp >> 13) ;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*@}*/
|
||
|
|
|
||
|
|
#endif /* __FIX_H */
|