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3 * Copyright (c) 2002-2007, Professor Benoit Macq
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36 @brief Implementation of operations on integers (INT)
38 The functions in INT.H have for goal to realize operations on integers.
41 #include "opj_includes.h"
42 /** @defgroup INT INT - Implementation of operations on integers */
45 /** @name Exported functions (see also openjpeg.h) */
47 /* ----------------------------------------------------------------------- */
49 Get the minimum of two integers
50 @return Returns a if a < b else b
52 static INLINE OPJ_INT32 int_min(OPJ_INT32 a, OPJ_INT32 b) {
57 Get the minimum of two integers
58 @return Returns a if a < b else b
60 static INLINE OPJ_UINT32 uint_min(OPJ_UINT32 a, OPJ_UINT32 b) {
65 Get the maximum of two integers
66 @return Returns a if a > b else b
68 static INLINE OPJ_INT32 int_max(OPJ_INT32 a, OPJ_INT32 b) {
69 return (a > b) ? a : b;
73 Get the maximum of two integers
74 @return Returns a if a > b else b
76 static INLINE OPJ_UINT32 uint_max(OPJ_UINT32 a, OPJ_UINT32 b) {
77 return (a > b) ? a : b;
80 Clamp an integer inside an interval
83 <li>Returns a if (min < a < max)
84 <li>Returns max if (a > max)
85 <li>Returns min if (a < min)
88 static INLINE OPJ_INT32 int_clamp(OPJ_INT32 a, OPJ_INT32 min, OPJ_INT32 max) {
96 @return Get absolute value of integer
98 static INLINE OPJ_INT32 int_abs(OPJ_INT32 a) {
99 return a < 0 ? -a : a;
102 Divide an integer and round upwards
103 @return Returns a divided by b
105 static INLINE OPJ_INT32 int_ceildiv(OPJ_INT32 a, OPJ_INT32 b) {
106 return (a + b - 1) / b;
110 Divide an integer and round upwards
111 @return Returns a divided by b
113 static INLINE OPJ_UINT32 uint_ceildiv(OPJ_UINT32 a, OPJ_UINT32 b) {
114 return (a + b - 1) / b;
117 Divide an integer by a power of 2 and round upwards
118 @return Returns a divided by 2^b
120 static INLINE OPJ_INT32 int_ceildivpow2(OPJ_INT32 a, OPJ_INT32 b) {
121 return (a + (1 << b) - 1) >> b;
124 Divide an integer by a power of 2 and round downwards
125 @return Returns a divided by 2^b
127 static INLINE OPJ_INT32 int_floordivpow2(OPJ_INT32 a, OPJ_INT32 b) {
131 Get logarithm of an integer and round downwards
132 @return Returns log2(a)
134 static INLINE OPJ_INT32 int_floorlog2(OPJ_INT32 a) {
136 for (l = 0; a > 1; l++) {
143 Get logarithm of an integer and round downwards
144 @return Returns log2(a)
146 static INLINE OPJ_UINT32 uint_floorlog2(OPJ_UINT32 a) {
148 for (l = 0; a > 1; ++l)
154 /* ----------------------------------------------------------------------- */