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