| /* | |
| Copyright (C) 2006 Pedro Felzenszwalb | |
| This program is free software; you can redistribute it and/or modify | |
| it under the terms of the GNU General Public License as published by | |
| the Free Software Foundation; either version 2 of the License, or | |
| (at your option) any later version. | |
| This program is distributed in the hope that it will be useful, | |
| but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| GNU General Public License for more details. | |
| You should have received a copy of the GNU General Public License | |
| along with this program; if not, write to the Free Software | |
| Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| */ | |
| /* random stuff */ | |
| typedef unsigned char uchar; | |
| typedef struct { uchar r, g, b; } rgb; | |
| inline bool operator==(const rgb &a, const rgb &b) { | |
| return ((a.r == b.r) && (a.g == b.g) && (a.b == b.b)); | |
| } | |
| template <class T> | |
| inline T abs(const T &x) { return (x > 0 ? x : -x); }; | |
| template <class T> | |
| inline int sign(const T &x) { return (x >= 0 ? 1 : -1); }; | |
| template <class T> | |
| inline T square(const T &x) { return x*x; }; | |
| template <class T> | |
| inline T bound(const T &x, const T &min, const T &max) { | |
| return (x < min ? min : (x > max ? max : x)); | |
| } | |
| template <class T> | |
| inline bool check_bound(const T &x, const T&min, const T &max) { | |
| return ((x < min) || (x > max)); | |
| } | |
| inline int vlib_round(float x) { return (int)(x + 0.5F); } | |
| inline int vlib_round(double x) { return (int)(x + 0.5); } | |
| inline double gaussian(double val, double sigma) { | |
| return exp(-square(val/sigma)/2)/(sqrt(2*M_PI)*sigma); | |
| } | |