#ifndef COMMON_H

#define COMMON_H

#include <cmath>

#include <cstdlib>

#include <algorithm>

#include <glibmm/refptr.h>

typedef float ColorReal;

typedef double Real;

typedef int Int;

typedef unsigned int UInt;

typedef long long int LongInt;

typedef unsigned long long int ULongInt;

using Glib::RefPtr;

const Real real_precision = 1e-10;

const Real real_precision_sqr = real_precision * real_precision;

class Shared {

private:

	int ref_count;

public:

	Shared(): ref_count(1) { }

	Shared(const Shared&): ref_count(1) { }

	virtual ~Shared() { };

	inline Shared& operator=(const Shared&) { return *this; }

	inline void reference() {

		++ref_count;

	}

	inline void unreference() {

		if (--ref_count <= 0)

			delete this;

	}

};

class Color {

public:

	typedef ColorReal Channel;

	union {

		struct { Channel channels[4]; };

		struct { Channel r, g, b, a; };

	};

	inline explicit Color(Channel r = 0.0, Channel g = 0.0, Channel b = 0.0, Channel a = 0.0):

		r(r), g(g), b(b), a(a) { }

	inline Color operator+ (const Color &other) const

		{ return Color(r + other.r, g + other.g, b + other.b, a + other.a); }

	inline Color operator- (const Color &other) const

		{ return Color(r - other.r, g - other.g, b - other.b, a - other.a); }

	inline Color operator* (Channel k) const

		{ return Color(r*k, g*k, b*k, a*k); }

	inline Color& operator+= (const Color &other)

		{ r += other.r, g += other.g, b += other.b, a += other.a; return *this; }

	inline Color& operator-= (const Color &other)

		{ r -= other.r, g -= other.g, b -= other.b, a -= other.a; return *this; }

	inline Color& operator*= (Channel k)

		{ r *= k, g *= k, b *= k, a *= k; return *this; }

	inline Color get_mult_alpha() const

		{ return Color(r*a, g*a, b*a, a); }

	inline Color get_demult_alpha() const  {

		if (fabs(a) < real_precision) return *this;

		Channel k = 1/a;

		return Color(r*k, g*k, b*k, a);

	}

	inline void mult_alpha()

		{ r*=a, g*=a, b*=a; }

	inline void demult_alpha() {

		if (fabs(a) < real_precision) return;

		Real k = 1/a;

		r*=k, g*=k, b*=k;

	}

};

inline bool real_less(const Real &a, const Real &b)

	{ return a < b - real_precision; }

inline bool real_greater(const Real &a, const Real &b)

	{ return real_less(b, a); }

inline bool real_less_or_equal(const Real &a, const Real &b)

	{ return !real_less(b, a); }

inline bool real_greater_or_equal(const Real &a, const Real &b)

	{ return !real_less(a, b); }

inline bool real_equal(const Real &a, const Real &b)

	{ return !real_less(a, b) && !real_less(b, a); }

inline bool real_not_equal(const Real &a, const Real &b)

	{ return real_less(a, b) || real_less(b, a); }

inline int clz(const Int &x)

	{ return x ? __builtin_clz(x) : 32; }

inline int clz(const UInt &x)

	{ return x ? __builtin_clz(x) : 32; }

inline int clz(const LongInt &x)

	{ return x ? __builtin_clzll(x) : 64; }

inline int clz(const ULongInt &x)

	{ return x ? __builtin_clzll(x) : 64; }

inline Real clamp(Real x, Real min, Real max)

	{ return std::max(min, std::min(max, x)); }

inline int iclamp(int x, int min, int max)

	{ return std::max(min, std::min(max, x)); }

inline Real flip_clamp(Real x) {

	x -= floor(0.5*x)*2.0;

	return 1.0 - fabs(1.0 - x);

};

#endif