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3 * Copyright (c) 2002-2003, Yannick Verschueren
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5 * Copyright (c) 2005, Hervé 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 Exported functions (see also openjpeg.h) */
44 /* ----------------------------------------------------------------------- */
46 Get the minimum of two integers
47 @return Returns a if a < b else b
49 static INLINE 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 INLINE 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 INLINE int int_clamp(int a, int min, int max) {
76 @return Get absolute value of integer
78 static INLINE int int_abs(int a) {
79 return a < 0 ? -a : a;
82 Divide an integer and round upwards
83 @return Returns a divided by b
85 static INLINE int int_ceildiv(int a, int b) {
86 return (a + b - 1) / b;
89 Divide an integer by a power of 2 and round upwards
90 @return Returns a divided by 2^b
92 static INLINE int int_ceildivpow2(int a, int b) {
93 return (a + (1 << b) - 1) >> b;
96 Divide an integer by a power of 2 and round downwards
97 @return Returns a divided by 2^b
99 static INLINE int int_floordivpow2(int a, int b) {
103 Get logarithm of an integer and round downwards
104 @return Returns log2(a)
106 static INLINE int int_floorlog2(int a) {
108 for (l = 0; a > 1; l++) {
113 /* ----------------------------------------------------------------------- */