2 * Copyright (c) 2002-2007, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium
3 * Copyright (c) 2002-2007, Professor Benoit Macq
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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
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35 @brief Implementation of operations on integers (INT)
37 The functions in OPJ_INTMATH.H have for goal to realize operations on integers.
40 /** @defgroup OPJ_INTMATH OPJ_INTMATH - Implementation of operations on integers */
43 /** @name Exported functions (see also openjpeg.h) */
45 /* ----------------------------------------------------------------------- */
47 Get the minimum of two integers
48 @return Returns a if a < b else b
50 static INLINE OPJ_INT32 opj_int_min(OPJ_INT32 a, OPJ_INT32 b) {
55 Get the minimum of two integers
56 @return Returns a if a < b else b
58 static INLINE OPJ_UINT32 opj_uint_min(OPJ_UINT32 a, OPJ_UINT32 b) {
63 Get the maximum of two integers
64 @return Returns a if a > b else b
66 static INLINE OPJ_INT32 opj_int_max(OPJ_INT32 a, OPJ_INT32 b) {
67 return (a > b) ? a : b;
71 Get the maximum of two integers
72 @return Returns a if a > b else b
74 static INLINE OPJ_UINT32 opj_uint_max(OPJ_UINT32 a, OPJ_UINT32 b) {
75 return (a > b) ? a : b;
79 Clamp an integer inside an interval
82 <li>Returns a if (min < a < max)
83 <li>Returns max if (a > max)
84 <li>Returns min if (a < min)
87 static INLINE OPJ_INT32 opj_int_clamp(OPJ_INT32 a, OPJ_INT32 min, OPJ_INT32 max) {
95 @return Get absolute value of integer
97 static INLINE OPJ_INT32 opj_int_abs(OPJ_INT32 a) {
98 return a < 0 ? -a : a;
101 Divide an integer and round upwards
102 @return Returns a divided by b
104 static INLINE OPJ_INT32 opj_int_ceildiv(OPJ_INT32 a, OPJ_INT32 b) {
105 return (a + b - 1) / b;
109 Divide an integer and round upwards
110 @return Returns a divided by b
112 static INLINE OPJ_UINT32 opj_uint_ceildiv(OPJ_UINT32 a, OPJ_UINT32 b) {
113 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 opj_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 opj_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 opj_int_floorlog2(OPJ_INT32 a) {
136 for (l = 0; a > 1; l++) {
142 Get logarithm of an integer and round downwards
143 @return Returns log2(a)
145 static INLINE OPJ_UINT32 opj_uint_floorlog2(OPJ_UINT32 a) {
147 for (l = 0; a > 1; ++l)
155 Multiply two fixed-precision rational numbers.
158 @return Returns a * b
160 static INLINE OPJ_INT32 opj_int_fix_mul(OPJ_INT32 a, OPJ_INT32 b) {
161 OPJ_INT64 temp = (OPJ_INT64) a * (OPJ_INT64) b ;
163 return (OPJ_INT32) (temp >> 13) ;
166 /* ----------------------------------------------------------------------- */