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  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.  
  44. The 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. /**
  51. Multiply two fixed-precision rational numbers.
  52. @param a
  53. @param b
  54. @return Returns a * b
  55. */
  56. static 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 */
  65.