#pragma once

#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 override {

    return new TGenericColorFunction(m_m, m_c);

  }

  TPixel32 operator()(const TPixel32 &color) const override;

  bool getParameters(Parameters &p) const override;

};

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

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 override {

    return new TColorFader(m_color, m_fade);

  }

  TPixel32 operator()(const TPixel32 &color) const override;

  bool getParameters(Parameters &p) const override;

};

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

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 override {

    return new TOnionFader(m_color, m_fade);

  }

  TPixel32 operator()(const TPixel32 &color) const override;

  bool getParameters(Parameters &p) const override;

};

class DVAPI TTranspFader : public TColorFunction {

  double m_transp;

public:

  TTranspFader() : m_transp(0.5) {}

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

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

  TPixel32 operator()(const TPixel32 &color) const override;

  bool getParameters(Parameters &p) const override;

};

#endif