misc.h

#ifndef MISC_H
#define MISC_H

#include <cmath>

#ifndef M_PI
#define M_PI 3.141592653589793
#endif

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);
}

#endif