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Urvang Joshia22aca52020-03-04 12:12:56 -08001/*
2Copyright (C) 2006 Pedro Felzenszwalb
3
4This program is free software; you can redistribute it and/or modify
5it under the terms of the GNU General Public License as published by
6the Free Software Foundation; either version 2 of the License, or
7(at your option) any later version.
8
9This program is distributed in the hope that it will be useful,
10but WITHOUT ANY WARRANTY; without even the implied warranty of
11MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12GNU General Public License for more details.
13
14You should have received a copy of the GNU General Public License
15along with this program; if not, write to the Free Software
16Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17*/
18
19/* random stuff */
20
21#ifndef MISC_H
22#define MISC_H
23
24#include <cmath>
25
26#ifndef M_PI
27#define M_PI 3.141592653589793
28#endif
29
30typedef unsigned char uchar;
31
32typedef struct {
33 uchar r, g, b;
34} rgb;
35
36inline bool operator==(const rgb &a, const rgb &b) {
37 return ((a.r == b.r) && (a.g == b.g) && (a.b == b.b));
38}
39
40template <class T>
41inline T abs(const T &x) {
42 return (x > 0 ? x : -x);
43}
44
45template <class T>
46inline int sign(const T &x) {
47 return (x >= 0 ? 1 : -1);
48}
49
50template <class T>
51inline T square(const T &x) {
52 return x * x;
53}
54
55template <class T>
56inline T bound(const T &x, const T &min, const T &max) {
57 return (x < min ? min : (x > max ? max : x));
58}
59
60template <class T>
61inline bool check_bound(const T &x, const T &min, const T &max) {
62 return ((x < min) || (x > max));
63}
64
65inline int vlib_round(float x) { return (int)(x + 0.5F); }
66
67inline int vlib_round(double x) { return (int)(x + 0.5); }
68
69inline double gaussian(double val, double sigma) {
70 return exp(-square(val / sigma) / 2) / (sqrt(2 * M_PI) * sigma);
71}
72
73#endif