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41 @brief Implementation of operations on integers (INT)
43 The functions in OPJ_INTMATH.H have for goal to realize operations on integers.
46 /** @defgroup OPJ_INTMATH OPJ_INTMATH - Implementation of operations on integers */
49 /** @name Exported functions (see also openjpeg.h) */
51 /* ----------------------------------------------------------------------- */
53 Get the minimum of two integers
54 @return Returns a if a < b else b
56 static INLINE OPJ_INT32 opj_int_min(OPJ_INT32 a, OPJ_INT32 b) {
61 Get the minimum of two integers
62 @return Returns a if a < b else b
64 static INLINE OPJ_UINT32 opj_uint_min(OPJ_UINT32 a, OPJ_UINT32 b) {
69 Get the maximum of two integers
70 @return Returns a if a > b else b
72 static INLINE OPJ_INT32 opj_int_max(OPJ_INT32 a, OPJ_INT32 b) {
73 return (a > b) ? a : b;
77 Get the maximum of two integers
78 @return Returns a if a > b else b
80 static INLINE OPJ_UINT32 opj_uint_max(OPJ_UINT32 a, OPJ_UINT32 b) {
81 return (a > b) ? a : b;
85 Get the saturated sum of two unsigned integers
86 @return Returns saturated sum of a+b
88 static INLINE OPJ_UINT32 opj_uint_adds(OPJ_UINT32 a, OPJ_UINT32 b) {
89 OPJ_UINT64 sum = (OPJ_UINT64)a + (OPJ_UINT64)b;
90 return (OPJ_UINT32)(-(OPJ_INT32)(sum >> 32)) | (OPJ_UINT32)sum;
94 Clamp an integer inside an interval
97 <li>Returns a if (min < a < max)
98 <li>Returns max if (a > max)
99 <li>Returns min if (a < min)
102 static INLINE OPJ_INT32 opj_int_clamp(OPJ_INT32 a, OPJ_INT32 min, OPJ_INT32 max) {
110 @return Get absolute value of integer
112 static INLINE OPJ_INT32 opj_int_abs(OPJ_INT32 a) {
113 return a < 0 ? -a : a;
116 Divide an integer and round upwards
117 @return Returns a divided by b
119 static INLINE OPJ_INT32 opj_int_ceildiv(OPJ_INT32 a, OPJ_INT32 b) {
121 return (a + b - 1) / b;
125 Divide an integer and round upwards
126 @return Returns a divided by b
128 static INLINE OPJ_UINT32 opj_uint_ceildiv(OPJ_UINT32 a, OPJ_UINT32 b) {
130 return (a + b - 1) / b;
134 Divide an integer by a power of 2 and round upwards
135 @return Returns a divided by 2^b
137 static INLINE OPJ_INT32 opj_int_ceildivpow2(OPJ_INT32 a, OPJ_INT32 b) {
138 return (OPJ_INT32)((a + ((OPJ_INT64)1 << b) - 1) >> b);
142 Divide a 64bits integer by a power of 2 and round upwards
143 @return Returns a divided by 2^b
145 static INLINE OPJ_INT32 opj_int64_ceildivpow2(OPJ_INT64 a, OPJ_INT32 b) {
146 return (OPJ_INT32)((a + ((OPJ_INT64)1 << b) - 1) >> b);
150 Divide an integer by a power of 2 and round upwards
151 @return Returns a divided by 2^b
153 static INLINE OPJ_UINT32 opj_uint_ceildivpow2(OPJ_UINT32 a, OPJ_UINT32 b) {
154 return (OPJ_UINT32)((a + ((OPJ_UINT64)1U << b) - 1U) >> b);
158 Divide an integer by a power of 2 and round downwards
159 @return Returns a divided by 2^b
161 static INLINE OPJ_INT32 opj_int_floordivpow2(OPJ_INT32 a, OPJ_INT32 b) {
165 Get logarithm of an integer and round downwards
166 @return Returns log2(a)
168 static INLINE OPJ_INT32 opj_int_floorlog2(OPJ_INT32 a) {
170 for (l = 0; a > 1; l++) {
176 Get logarithm of an integer and round downwards
177 @return Returns log2(a)
179 static INLINE OPJ_UINT32 opj_uint_floorlog2(OPJ_UINT32 a) {
181 for (l = 0; a > 1; ++l)
189 Multiply two fixed-precision rational numbers.
192 @return Returns a * b
194 static INLINE OPJ_INT32 opj_int_fix_mul(OPJ_INT32 a, OPJ_INT32 b) {
195 #if defined(_MSC_VER) && (_MSC_VER >= 1400) && !defined(__INTEL_COMPILER) && defined(_M_IX86)
196 OPJ_INT64 temp = __emul(a, b);
198 OPJ_INT64 temp = (OPJ_INT64) a * (OPJ_INT64) b ;
201 assert((temp >> 13) <= (OPJ_INT64)0x7FFFFFFF);
202 assert((temp >> 13) >= (-(OPJ_INT64)0x7FFFFFFF - (OPJ_INT64)1));
203 return (OPJ_INT32) (temp >> 13);
206 static INLINE OPJ_INT32 opj_int_fix_mul_t1(OPJ_INT32 a, OPJ_INT32 b) {
207 #if defined(_MSC_VER) && (_MSC_VER >= 1400) && !defined(__INTEL_COMPILER) && defined(_M_IX86)
208 OPJ_INT64 temp = __emul(a, b);
210 OPJ_INT64 temp = (OPJ_INT64) a * (OPJ_INT64) b ;
213 assert((temp >> (13 + 11 - T1_NMSEDEC_FRACBITS)) <= (OPJ_INT64)0x7FFFFFFF);
214 assert((temp >> (13 + 11 - T1_NMSEDEC_FRACBITS)) >= (-(OPJ_INT64)0x7FFFFFFF - (OPJ_INT64)1));
215 return (OPJ_INT32) (temp >> (13 + 11 - T1_NMSEDEC_FRACBITS)) ;
218 /* ----------------------------------------------------------------------- */