2 * Copyright (c) 2001-2002, David Janssens
3 * Copyright (c) 2003, Yannick Verschueren
4 * Copyright (c) 2003, Communications and remote sensing Laboratory, Universite catholique de Louvain, Belgium
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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30 /// Get the minimum of two integers.
32 int int_min(int a, int b) {
37 /// Get the maximum of two integers.
39 int int_max(int a, int b) {
44 /// Clamp an integer inside an interval.
46 int int_clamp(int a, int min, int max) {
47 if (a<min) return min;
48 if (a>max) return max;
53 /// Get absolute value of integer.
60 /// Divide an integer and round upwards.
62 int int_ceildiv(int a, int b) {
67 /// Divide an integer by a power of 2 and round upwards.
69 int int_ceildivpow2(int a, int b) {
70 return (a+(1<<b)-1)>>b;
74 /// Divide an integer by a power of 2 and round downwards.
76 int int_floordivpow2(int a, int b) {
81 /// Get logarithm of an integer and round downwards.
83 int int_floorlog2(int a) {