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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 __INT_H
  32. #define __INT_H
  33. /**
  34. @file int.h
  35. @brief Implementation of operations on integers (INT)
  36.  
  37. The functions in INT.H have for goal to realize operations on integers.
  38. */
  39.  
  40. /** @defgroup INT INT - Implementation of operations on integers */
  41. /*@{*/
  42.  
  43. /** @name Exported functions (see also openjpeg.h) */
  44. /*@{*/
  45. /* ----------------------------------------------------------------------- */
  46. /**
  47. Get the minimum of two integers
  48. @return Returns a if a < b else b
  49. */
  50. static INLINE int int_min(int a, int b) {
  51.         return a < b ? a : b;
  52. }
  53. /**
  54. Get the maximum of two integers
  55. @return Returns a if a > b else b
  56. */
  57. static INLINE int int_max(int a, int b) {
  58.         return (a > b) ? a : b;
  59. }
  60. /**
  61. Clamp an integer inside an interval
  62. @return
  63. <ul>
  64. <li>Returns a if (min < a < max)
  65. <li>Returns max if (a > max)
  66. <li>Returns min if (a < min)
  67. </ul>
  68. */
  69. static INLINE int int_clamp(int a, int min, int max) {
  70.         if (a < min)
  71.                 return min;
  72.         if (a > max)
  73.                 return max;
  74.         return a;
  75. }
  76. /**
  77. @return Get absolute value of integer
  78. */
  79. static INLINE int int_abs(int a) {
  80.         return a < 0 ? -a : a;
  81. }
  82. /**
  83. Divide an integer and round upwards
  84. @return Returns a divided by b
  85. */
  86. static INLINE int int_ceildiv(int a, int b) {
  87.         return (a + b - 1) / b;
  88. }
  89. /**
  90. Divide an integer by a power of 2 and round upwards
  91. @return Returns a divided by 2^b
  92. */
  93. static INLINE int int_ceildivpow2(int a, int b) {
  94.         return (a + (1 << b) - 1) >> b;
  95. }
  96. /**
  97. Divide an integer by a power of 2 and round downwards
  98. @return Returns a divided by 2^b
  99. */
  100. static INLINE int int_floordivpow2(int a, int b) {
  101.         return a >> b;
  102. }
  103. /**
  104. Get logarithm of an integer and round downwards
  105. @return Returns log2(a)
  106. */
  107. static INLINE int int_floorlog2(int a) {
  108.         int l;
  109.         for (l = 0; a > 1; l++) {
  110.                 a >>= 1;
  111.         }
  112.         return l;
  113. }
  114. /* ----------------------------------------------------------------------- */
  115. /*@}*/
  116.  
  117. /*@}*/
  118.  
  119. #endif
  120.