#ifndef T_COLOR_FUNCTIONS_INCLUDED
#define T_COLOR_FUNCTIONS_INCLUDED

#include "tpixel.h"

#undef DVAPI
#undef DVVAR
#ifdef TCOLOR_EXPORTS
#define DVAPI DV_EXPORT_API
#define DVVAR DV_EXPORT_VAR
#else
#define DVAPI DV_IMPORT_API
#define DVVAR DV_IMPORT_VAR
#endif

//-----------------------------------------------------------------------------

class DVAPI TColorFunction
{
public:
	virtual TPixel32 operator()(const TPixel32 &color) const = 0; // {return color;};

	struct Parameters { // outX = tcrop(inX * m_mX + m_cX, 0, 1); 0<=inX<=1
		double m_mR, m_mG, m_mB, m_mM;
		double m_cR, m_cG, m_cB, m_cM;
		Parameters() : m_mR(1), m_mG(1), m_mB(1), m_mM(1), m_cR(0), m_cG(0), m_cB(0), m_cM(0) {}
	};

	virtual TColorFunction *clone() const = 0;
	virtual bool getParameters(Parameters &p) const = 0; //{ p = Parameters(); return true; }

	virtual ~TColorFunction() {}
};

//-----------------------------------------------------------------------------

class DVAPI TGenericColorFunction : public TColorFunction
{
	double m_m[4], m_c[4];

public:
	TGenericColorFunction(const double m[4], const double c[4]);

	TColorFunction *clone() const
	{
		return new TGenericColorFunction(m_m, m_c);
	}

	TPixel32 operator()(const TPixel32 &color) const;
	bool getParameters(Parameters &p) const;
};

//-----------------------------------------------------------------------------

class DVAPI TColorFader : public TColorFunction
{
	TPixel32 m_color;
	double m_fade;

public:
	TColorFader() : m_color(), m_fade(0.5) {}
	TColorFader(const TPixel32 &color, double fade)
		: m_color(color), m_fade(fade)
	{
	}

	TColorFunction *clone() const
	{
		return new TColorFader(m_color, m_fade);
	}

	TPixel32 operator()(const TPixel32 &color) const;
	bool getParameters(Parameters &p) const;
};

//-----------------------------------------------------------------------------

class DVAPI TOnionFader : public TColorFunction
{
	TPixel32 m_color;
	double m_fade;

public:
	TOnionFader() : m_color(), m_fade(0.5) {}
	TOnionFader(const TPixel32 &color, double fade)
		: m_color(color), m_fade(fade)
	{
	}

	TColorFunction *clone() const
	{
		return new TOnionFader(m_color, m_fade);
	}

	TPixel32 operator()(const TPixel32 &color) const;
	bool getParameters(Parameters &p) const;
};

class DVAPI TTranspFader : public TColorFunction
{
	double m_transp;

public:
	TTranspFader() : m_transp(0.5) {}
	TTranspFader(double transp)
		: m_transp(transp)
	{
	}

	TColorFunction *clone() const
	{
		return new TTranspFader(m_transp);
	}

	TPixel32 operator()(const TPixel32 &color) const;
	bool getParameters(Parameters &p) const;
};

#endif