90 lines
2.6 KiB
C
90 lines
2.6 KiB
C
/*
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* Copyright (c) 2001-2002, David Janssens
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* Copyright (c) 2003, Yannick Verschueren
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* Copyright (c) 2003, Communications and remote sensing Laboratory, Universite catholique de Louvain, Belgium
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/// <summary>
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/// Get the minimum of two integers.
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/// </summary>
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int int_min(int a, int b) {
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return a<b?a:b;
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}
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/// <summary>
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/// Get the maximum of two integers.
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/// </summary>
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int int_max(int a, int b) {
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return a>b?a:b;
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}
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/// <summary>
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/// Clamp an integer inside an interval.
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/// </summary>
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int int_clamp(int a, int min, int max) {
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if (a<min) return min;
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if (a>max) return max;
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return a;
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}
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/// <summary>
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/// Get absolute value of integer.
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/// </summary>
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int int_abs(int a) {
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return a<0?-a:a;
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}
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/// <summary>
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/// Divide an integer and round upwards.
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/// </summary>
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int int_ceildiv(int a, int b) {
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return (a+b-1)/b;
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}
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/// <summary>
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/// Divide an integer by a power of 2 and round upwards.
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/// </summary>
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int int_ceildivpow2(int a, int b) {
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return (a+(1<<b)-1)>>b;
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}
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/// <summary>
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/// Divide an integer by a power of 2 and round downwards.
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/// </summary>
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int int_floordivpow2(int a, int b) {
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return a>>b;
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}
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/// <summary>
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/// Get logarithm of an integer and round downwards.
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/// </summary>
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int int_floorlog2(int a) {
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int l;
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for (l=0; a>1; l++) {
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a>>=1;
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}
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return l;
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}
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