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3 * Copyright (c) 2002-2003, Yannick Verschueren
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5 * Copyright (c) 2005, Herv� Drolon, FreeImage Team
6 * Copyright (c) 2002-2005, Communications and remote sensing Laboratory, Universite catholique de Louvain, Belgium
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34 @brief Implementation of operations on integers (INT)
36 The functions in INT.H have for goal to realize operations on integers.
39 /** @defgroup INT INT - Implementation of operations on integers */
42 /** @name Funciones generales (see also openjpeg.h) */
44 /* ----------------------------------------------------------------------- */
46 Get the minimum of two integers
47 @return Returns a if a < b else b
49 static int int_min(int a, int b) {
53 Get the maximum of two integers
54 @return Returns a if a > b else b
56 static int int_max(int a, int b) {
57 return (a > b) ? a : b;
60 Clamp an integer inside an interval
63 <li>Returns a if (min < a < max)
64 <li>Returns max if (a > max)
65 <li>Returns min if (a < min)
68 static int int_clamp(int a, int min, int max) {
76 @return Get absolute value of integer
78 static int int_abs(int a) {
79 return a < 0 ? -a : a;
82 static double dbl_abs(double a) {
83 return a < 0 ? -a : a;
86 Divide an integer and round upwards
87 @return Returns a divided by b
89 static int int_ceildiv(int a, int b) {
90 return (a + b - 1) / b;
93 Divide an integer by a power of 2 and round upwards
94 @return Returns a divided by 2^b
96 static int int_ceildivpow2(int a, int b) {
97 return (a + (1 << b) - 1) >> b;
100 Divide an integer by a power of 2 and round downwards
101 @return Returns a divided by 2^b
103 static int int_floordivpow2(int a, int b) {
107 Get logarithm of an integer and round downwards
108 @return Returns log2(a)
110 static int int_floorlog2(int a) {
112 for (l = 0; a > 1; l++) {
117 /* ----------------------------------------------------------------------- */