123 lines
3.4 KiB
C
Executable File
123 lines
3.4 KiB
C
Executable File
/*
|
|
* Copyright (c) 2001-2003, David Janssens
|
|
* Copyright (c) 2002-2003, Yannick Verschueren
|
|
* Copyright (c) 2003-2005, Francois Devaux and Antonin Descampe
|
|
* Copyright (c) 2005, Hervé Drolon, FreeImage Team
|
|
* Copyright (c) 2002-2005, Communications and remote sensing Laboratory, Universite catholique de Louvain, Belgium
|
|
* 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 int.h
|
|
@brief Implementation of operations on integers (INT)
|
|
|
|
The functions in INT.H have for goal to realize operations on integers.
|
|
*/
|
|
|
|
/** @defgroup INT INT - Implementation of operations on integers */
|
|
/*@{*/
|
|
|
|
/** @name Funciones generales (see also openjpeg.h) */
|
|
/*@{*/
|
|
/* ----------------------------------------------------------------------- */
|
|
/**
|
|
Get the minimum of two integers
|
|
@return Returns a if a < b else b
|
|
*/
|
|
static int int_min(int a, int b) {
|
|
return a < b ? a : b;
|
|
}
|
|
/**
|
|
Get the maximum of two integers
|
|
@return Returns a if a > b else b
|
|
*/
|
|
static int int_max(int a, int 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 int int_clamp(int a, int min, int max) {
|
|
if (a < min)
|
|
return min;
|
|
if (a > max)
|
|
return max;
|
|
return a;
|
|
}
|
|
/**
|
|
@return Get absolute value of integer
|
|
*/
|
|
static int int_abs(int a) {
|
|
return a < 0 ? -a : a;
|
|
}
|
|
|
|
static double dbl_abs(double a) {
|
|
return a < 0 ? -a : a;
|
|
}
|
|
/**
|
|
Divide an integer and round upwards
|
|
@return Returns a divided by b
|
|
*/
|
|
static int int_ceildiv(int a, int 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 int int_ceildivpow2(int a, int 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 int int_floordivpow2(int a, int b) {
|
|
return a >> b;
|
|
}
|
|
/**
|
|
Get logarithm of an integer and round downwards
|
|
@return Returns log2(a)
|
|
*/
|
|
static int int_floorlog2(int a) {
|
|
int l;
|
|
for (l = 0; a > 1; l++) {
|
|
a >>= 1;
|
|
}
|
|
return l;
|
|
}
|
|
/* ----------------------------------------------------------------------- */
|
|
/*@}*/
|
|
|
|
/*@}*/
|
|
|
|
#endif
|