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  1. /*
  2.  * Copyright (c) 2001-2003, David Janssens
  3.  * Copyright (c) 2002-2003, Yannick Verschueren
  4.  * Copyright (c) 2003-2005, Francois Devaux and Antonin Descampe
  5.  * Copyright (c) 2005, Hervé Drolon, FreeImage Team
  6.  * Copyright (c) 2002-2005, Communications and remote sensing Laboratory, Universite catholique de Louvain, Belgium
  7.  * All rights reserved.
  8.  *
  9.  * Redistribution and use in source and binary forms, with or without
  10.  * modification, are permitted provided that the following conditions
  11.  * are met:
  12.  * 1. Redistributions of source code must retain the above copyright
  13.  *    notice, this list of conditions and the following disclaimer.
  14.  * 2. Redistributions in binary form must reproduce the above copyright
  15.  *    notice, this list of conditions and the following disclaimer in the
  16.  *    documentation and/or other materials provided with the distribution.
  17.  *
  18.  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
  19.  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20.  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21.  * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  22.  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  23.  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  24.  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  25.  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  26.  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  27.  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  28.  * POSSIBILITY OF SUCH DAMAGE.
  29.  */
  30. #ifndef __INT_H
  31. #define __INT_H
  32. /**
  33. @file int.h
  34. @brief Implementation of operations on integers (INT)
  35.  
  36. The functions in INT.H have for goal to realize operations on integers.
  37. */
  38.  
  39. /** @defgroup INT INT - Implementation of operations on integers */
  40. /*@{*/
  41.  
  42. /** @name Funciones generales (see also openjpeg3d.h) */
  43. /*@{*/
  44. /* ----------------------------------------------------------------------- */
  45. /**
  46. Get the minimum of two integers
  47. @return Returns a if a < b else b
  48. */
  49. static  int int_min(int a, int b) {
  50.         return a < b ? a : b;
  51. }
  52. /**
  53. Get the maximum of two integers
  54. @return Returns a if a > b else b
  55. */
  56. static  int int_max(int a, int b) {
  57.         return (a > b) ? a : b;
  58. }
  59. /**
  60. Clamp an integer inside an interval
  61. @return
  62. <ul>
  63. <li>Returns a if (min < a < max)
  64. <li>Returns max if (a > max)
  65. <li>Returns min if (a < min)
  66. </ul>
  67. */
  68. static int int_clamp(int a, int min, int max) {
  69.         if (a < min)
  70.                 return min;
  71.         if (a > max)
  72.                 return max;
  73.         return a;
  74. }
  75. /**
  76. @return Get absolute value of integer
  77. */
  78. static  int int_abs(int a) {
  79.         return a < 0 ? -a : a;
  80. }
  81.  
  82. static double dbl_abs(double a) {
  83.         return a < 0 ? -a : a;
  84. }
  85. /**
  86. Divide an integer and round upwards
  87. @return Returns a divided by b
  88. */
  89. static  int int_ceildiv(int a, int b) {
  90.         return (a + b - 1) / b;
  91. }
  92. /**
  93. Divide an integer by a power of 2 and round upwards
  94. @return Returns a divided by 2^b
  95. */
  96. static  int int_ceildivpow2(int a, int b) {
  97.         return (a + (1 << b) - 1) >> b;
  98. }
  99. /**
  100. Divide an integer by a power of 2 and round downwards
  101. @return Returns a divided by 2^b
  102. */
  103. static  int int_floordivpow2(int a, int b) {
  104.         return a >> b;
  105. }
  106. /**
  107. Get logarithm of an integer and round downwards
  108. @return Returns log2(a)
  109. */
  110. static  int int_floorlog2(int a) {
  111.         int l;
  112.         for (l = 0; a > 1; l++) {
  113.                 a >>= 1;
  114.         }
  115.         return l;
  116. }
  117. /* ----------------------------------------------------------------------- */
  118. /*@}*/
  119.  
  120. /*@}*/
  121.  
  122. #endif
  123.