/*
- * The copyright in this software is being made available under the 2-clauses
- * BSD License, included below. This software may be subject to other third
+ * The copyright in this software is being made available under the 2-clauses
+ * BSD License, included below. This software may be subject to other third
* party and contributor rights, including patent rights, and no such rights
* are granted under this license.
*
* Copyright (c) 2002-2014, Professor Benoit Macq
* Copyright (c) 2001-2003, David Janssens
* Copyright (c) 2002-2003, Yannick Verschueren
- * Copyright (c) 2003-2007, Francois-Olivier Devaux
+ * Copyright (c) 2003-2007, Francois-Olivier Devaux
* Copyright (c) 2003-2014, Antonin Descampe
* Copyright (c) 2005, Herve Drolon, FreeImage Team
* All rights reserved.
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
-#ifndef __INT_H
-#define __INT_H
+#ifndef OPJ_INTMATH_H
+#define OPJ_INTMATH_H
/**
@file opj_intmath.h
@brief Implementation of operations on integers (INT)
Get the minimum of two integers
@return Returns a if a < b else b
*/
-static INLINE OPJ_INT32 opj_int_min(OPJ_INT32 a, OPJ_INT32 b) {
- return a < b ? a : b;
+static INLINE OPJ_INT32 opj_int_min(OPJ_INT32 a, OPJ_INT32 b)
+{
+ return a < b ? a : b;
}
/**
Get the minimum of two integers
@return Returns a if a < b else b
*/
-static INLINE OPJ_UINT32 opj_uint_min(OPJ_UINT32 a, OPJ_UINT32 b) {
- return a < b ? a : b;
+static INLINE OPJ_UINT32 opj_uint_min(OPJ_UINT32 a, OPJ_UINT32 b)
+{
+ return a < b ? a : b;
}
/**
Get the maximum of two integers
@return Returns a if a > b else b
*/
-static INLINE OPJ_INT32 opj_int_max(OPJ_INT32 a, OPJ_INT32 b) {
- return (a > b) ? a : b;
+static INLINE OPJ_INT32 opj_int_max(OPJ_INT32 a, OPJ_INT32 b)
+{
+ return (a > b) ? a : b;
}
/**
Get the maximum of two integers
@return Returns a if a > b else b
*/
-static INLINE OPJ_UINT32 opj_uint_max(OPJ_UINT32 a, OPJ_UINT32 b) {
- return (a > b) ? a : b;
+static INLINE OPJ_UINT32 opj_uint_max(OPJ_UINT32 a, OPJ_UINT32 b)
+{
+ return (a > b) ? a : b;
}
/**
Get the saturated sum of two unsigned integers
@return Returns saturated sum of a+b
*/
-static INLINE OPJ_UINT32 opj_uint_adds(OPJ_UINT32 a, OPJ_UINT32 b) {
- OPJ_UINT64 sum = (OPJ_UINT64)a + (OPJ_UINT64)b;
- return (OPJ_UINT32)(-(OPJ_INT32)(sum >> 32)) | (OPJ_UINT32)sum;
+static INLINE OPJ_UINT32 opj_uint_adds(OPJ_UINT32 a, OPJ_UINT32 b)
+{
+ OPJ_UINT64 sum = (OPJ_UINT64)a + (OPJ_UINT64)b;
+ return (OPJ_UINT32)(-(OPJ_INT32)(sum >> 32)) | (OPJ_UINT32)sum;
+}
+
+/**
+ Get the saturated difference of two unsigned integers
+ @return Returns saturated sum of a-b
+ */
+static INLINE OPJ_UINT32 opj_uint_subs(OPJ_UINT32 a, OPJ_UINT32 b)
+{
+ return (a >= b) ? a - b : 0;
}
/**
<ul>
<li>Returns a if (min < a < max)
<li>Returns max if (a > max)
-<li>Returns min if (a < min)
+<li>Returns min if (a < min)
</ul>
*/
-static INLINE OPJ_INT32 opj_int_clamp(OPJ_INT32 a, OPJ_INT32 min, OPJ_INT32 max) {
- if (a < min)
- return min;
- if (a > max)
- return max;
- return a;
+static INLINE OPJ_INT32 opj_int_clamp(OPJ_INT32 a, OPJ_INT32 min,
+ OPJ_INT32 max)
+{
+ if (a < min) {
+ return min;
+ }
+ if (a > max) {
+ return max;
+ }
+ return a;
}
+
+/**
+Clamp an integer inside an interval
+@return
+<ul>
+<li>Returns a if (min < a < max)
+<li>Returns max if (a > max)
+<li>Returns min if (a < min)
+</ul>
+*/
+static INLINE OPJ_INT64 opj_int64_clamp(OPJ_INT64 a, OPJ_INT64 min,
+ OPJ_INT64 max)
+{
+ if (a < min) {
+ return min;
+ }
+ if (a > max) {
+ return max;
+ }
+ return a;
+}
+
/**
@return Get absolute value of integer
*/
-static INLINE OPJ_INT32 opj_int_abs(OPJ_INT32 a) {
- return a < 0 ? -a : a;
+static INLINE OPJ_INT32 opj_int_abs(OPJ_INT32 a)
+{
+ return a < 0 ? -a : a;
}
/**
Divide an integer and round upwards
@return Returns a divided by b
*/
-static INLINE OPJ_INT32 opj_int_ceildiv(OPJ_INT32 a, OPJ_INT32 b) {
- assert(b);
- return (a + b - 1) / b;
+static INLINE OPJ_INT32 opj_int_ceildiv(OPJ_INT32 a, OPJ_INT32 b)
+{
+ assert(b);
+ return (OPJ_INT32)(((OPJ_INT64)a + b - 1) / b);
}
/**
Divide an integer and round upwards
@return Returns a divided by b
*/
-static INLINE OPJ_UINT32 opj_uint_ceildiv(OPJ_UINT32 a, OPJ_UINT32 b) {
- assert(b);
- return (a + b - 1) / b;
+static INLINE OPJ_UINT32 opj_uint_ceildiv(OPJ_UINT32 a, OPJ_UINT32 b)
+{
+ assert(b);
+ return (OPJ_UINT32)(((OPJ_UINT64)a + b - 1) / b);
}
/**
Divide an integer by a power of 2 and round upwards
@return Returns a divided by 2^b
*/
-static INLINE OPJ_INT32 opj_int_ceildivpow2(OPJ_INT32 a, OPJ_INT32 b) {
- return (OPJ_INT32)((a + (OPJ_INT64)(1 << b) - 1) >> b);
+static INLINE OPJ_INT32 opj_int_ceildivpow2(OPJ_INT32 a, OPJ_INT32 b)
+{
+ return (OPJ_INT32)((a + ((OPJ_INT64)1 << b) - 1) >> b);
+}
+
+/**
+ Divide a 64bits integer by a power of 2 and round upwards
+ @return Returns a divided by 2^b
+ */
+static INLINE OPJ_INT32 opj_int64_ceildivpow2(OPJ_INT64 a, OPJ_INT32 b)
+{
+ return (OPJ_INT32)((a + ((OPJ_INT64)1 << b) - 1) >> b);
}
/**
Divide an integer by a power of 2 and round upwards
@return Returns a divided by 2^b
*/
-static INLINE OPJ_UINT32 opj_uint_ceildivpow2(OPJ_UINT32 a, OPJ_UINT32 b) {
- return (OPJ_UINT32)((a + (OPJ_UINT64)(1U << b) - 1U) >> b);
+static INLINE OPJ_UINT32 opj_uint_ceildivpow2(OPJ_UINT32 a, OPJ_UINT32 b)
+{
+ return (OPJ_UINT32)((a + ((OPJ_UINT64)1U << b) - 1U) >> b);
+}
+
+/**
+Divide an integer by a power of 2 and round downwards
+@return Returns a divided by 2^b
+*/
+static INLINE OPJ_INT32 opj_int_floordivpow2(OPJ_INT32 a, OPJ_INT32 b)
+{
+ return a >> b;
}
/**
Divide an integer by a power of 2 and round downwards
@return Returns a divided by 2^b
*/
-static INLINE OPJ_INT32 opj_int_floordivpow2(OPJ_INT32 a, OPJ_INT32 b) {
- return a >> b;
+static INLINE OPJ_UINT32 opj_uint_floordivpow2(OPJ_UINT32 a, OPJ_UINT32 b)
+{
+ return a >> b;
}
+
/**
Get logarithm of an integer and round downwards
@return Returns log2(a)
*/
-static INLINE OPJ_INT32 opj_int_floorlog2(OPJ_INT32 a) {
- OPJ_INT32 l;
- for (l = 0; a > 1; l++) {
- a >>= 1;
- }
- return l;
+static INLINE OPJ_INT32 opj_int_floorlog2(OPJ_INT32 a)
+{
+ OPJ_INT32 l;
+ for (l = 0; a > 1; l++) {
+ a >>= 1;
+ }
+ return l;
}
/**
Get logarithm of an integer and round downwards
@return Returns log2(a)
*/
-static INLINE OPJ_UINT32 opj_uint_floorlog2(OPJ_UINT32 a) {
- OPJ_UINT32 l;
- for (l = 0; a > 1; ++l)
- {
- a >>= 1;
- }
- return l;
+static INLINE OPJ_UINT32 opj_uint_floorlog2(OPJ_UINT32 a)
+{
+ OPJ_UINT32 l;
+ for (l = 0; a > 1; ++l) {
+ a >>= 1;
+ }
+ return l;
}
/**
@param b
@return Returns a * b
*/
-static INLINE OPJ_INT32 opj_int_fix_mul(OPJ_INT32 a, OPJ_INT32 b) {
- OPJ_INT64 temp = (OPJ_INT64) a * (OPJ_INT64) b ;
- temp += 4096;
- assert((temp >> 13) <= (OPJ_INT64)0x7FFFFFFF);
- assert((temp >> 13) >= (-(OPJ_INT64)0x7FFFFFFF - (OPJ_INT64)1));
- return (OPJ_INT32) (temp >> 13);
+static INLINE OPJ_INT32 opj_int_fix_mul(OPJ_INT32 a, OPJ_INT32 b)
+{
+#if defined(_MSC_VER) && (_MSC_VER >= 1400) && !defined(__INTEL_COMPILER) && defined(_M_IX86)
+ OPJ_INT64 temp = __emul(a, b);
+#else
+ OPJ_INT64 temp = (OPJ_INT64) a * (OPJ_INT64) b ;
+#endif
+ temp += 4096;
+ assert((temp >> 13) <= (OPJ_INT64)0x7FFFFFFF);
+ assert((temp >> 13) >= (-(OPJ_INT64)0x7FFFFFFF - (OPJ_INT64)1));
+ return (OPJ_INT32)(temp >> 13);
}
-static INLINE OPJ_INT32 opj_int_fix_mul_t1(OPJ_INT32 a, OPJ_INT32 b) {
- OPJ_INT64 temp = (OPJ_INT64) a * (OPJ_INT64) b ;
- temp += 4096;
- assert((temp >> (13 + 11 - T1_NMSEDEC_FRACBITS)) <= (OPJ_INT64)0x7FFFFFFF);
- assert((temp >> (13 + 11 - T1_NMSEDEC_FRACBITS)) >= (-(OPJ_INT64)0x7FFFFFFF - (OPJ_INT64)1));
- return (OPJ_INT32) (temp >> (13 + 11 - T1_NMSEDEC_FRACBITS)) ;
+static INLINE OPJ_INT32 opj_int_fix_mul_t1(OPJ_INT32 a, OPJ_INT32 b)
+{
+#if defined(_MSC_VER) && (_MSC_VER >= 1400) && !defined(__INTEL_COMPILER) && defined(_M_IX86)
+ OPJ_INT64 temp = __emul(a, b);
+#else
+ OPJ_INT64 temp = (OPJ_INT64) a * (OPJ_INT64) b ;
+#endif
+ temp += 4096;
+ assert((temp >> (13 + 11 - T1_NMSEDEC_FRACBITS)) <= (OPJ_INT64)0x7FFFFFFF);
+ assert((temp >> (13 + 11 - T1_NMSEDEC_FRACBITS)) >= (-(OPJ_INT64)0x7FFFFFFF -
+ (OPJ_INT64)1));
+ return (OPJ_INT32)(temp >> (13 + 11 - T1_NMSEDEC_FRACBITS)) ;
+}
+
+/**
+Addition two signed integers with a wrap-around behaviour.
+Assumes complement-to-two signed integers.
+@param a
+@param b
+@return Returns a + b
+*/
+static INLINE OPJ_INT32 opj_int_add_no_overflow(OPJ_INT32 a, OPJ_INT32 b)
+{
+ void* pa = &a;
+ void* pb = &b;
+ OPJ_UINT32* upa = (OPJ_UINT32*)pa;
+ OPJ_UINT32* upb = (OPJ_UINT32*)pb;
+ OPJ_UINT32 ures = *upa + *upb;
+ void* pures = &ures;
+ OPJ_INT32* ipres = (OPJ_INT32*)pures;
+ return *ipres;
+}
+
+/**
+Subtract two signed integers with a wrap-around behaviour.
+Assumes complement-to-two signed integers.
+@param a
+@param b
+@return Returns a - b
+*/
+static INLINE OPJ_INT32 opj_int_sub_no_overflow(OPJ_INT32 a, OPJ_INT32 b)
+{
+ void* pa = &a;
+ void* pb = &b;
+ OPJ_UINT32* upa = (OPJ_UINT32*)pa;
+ OPJ_UINT32* upb = (OPJ_UINT32*)pb;
+ OPJ_UINT32 ures = *upa - *upb;
+ void* pures = &ures;
+ OPJ_INT32* ipres = (OPJ_INT32*)pures;
+ return *ipres;
}
/* ----------------------------------------------------------------------- */
/*@}*/
-#endif
+#endif /* OPJ_INTMATH_H */
projects / openjpeg.git / blobdiff