openjpeg/src/lib/openjp2/opj_intmath.h

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/*
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* Copyright (c) 2002-2007, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium
* Copyright (c) 2002-2007, Professor Benoit Macq
* Copyright (c) 2001-2003, David Janssens
* Copyright (c) 2002-2003, Yannick Verschueren
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* Copyright (c) 2003-2007, Francois-Olivier Devaux and Antonin Descampe
* Copyright (c) 2005, Herve Drolon, FreeImage Team
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* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* 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
/**
@file opj_intmath.h
@brief Implementation of operations on integers (INT)
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The functions in OPJ_INTMATH.H have for goal to realize operations on integers.
*/
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/** @defgroup OPJ_INTMATH OPJ_INTMATH - Implementation of operations on integers */
/*@{*/
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/** @name Exported functions (see also openjpeg.h) */
/*@{*/
/* ----------------------------------------------------------------------- */
/**
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;
}
/**
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;
}
/**
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;
}
/**
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;
}
/**
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_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;
}
/**
@return Get absolute value of integer
*/
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) {
return (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) {
return (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 (a + (1 << b) - 1) >> 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;
}
/**
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;
}
/**
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;
}
/**
Multiply two fixed-precision rational numbers.
@param a
@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 += temp & 4096;
return (OPJ_INT32) (temp >> 13) ;
}
/* ----------------------------------------------------------------------- */
/*@}*/
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/*@}*/
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#endif