// -*- C++ -*-
#ifndef RICOLORRGB_H
#define RICOLORRGB_H
/* Copyright 1998 
 * Tue Jul 28 20:15:58 1998  Brian Edward Smits  (bes@phoenix.cs.utah.edu)
 * 
 * RiColorRGB.H
 * 
 *	
 * 
 * $Id: RiColorRGB.H,v 1.1 1998/08/12 20:23:07 bes Exp $ 
 * 
 */
#ifndef RICOMMON_H
#include <RiCommon.H>
#endif

#ifndef RISPECTRUM_H
#include <RiSpectrum.H>
#endif

#ifndef RICOLORXYZV_H
#include <RiColorXYZV.H>
#endif


/***************************************************************
CLASS
    RiColorRGB
     Screen space RGB 

DESCRIPTION
     Basically this just holds data and provides some type checking.  The conversion operators
     are abstracted in the RiRGBConverter class.

****************************************************************/

class RiColorRGB {
  public:
				// GROUP: Constructors and assignment
				//// Default Constructor
    RiColorRGB();
				//// Construct from RiReal's
    RiColorRGB(RiReal r, RiReal g, RiReal b);
				// GROUP: Accessors
				////
    RiReal R() const;
				////
    RiReal G() const;
				////
    RiReal B() const;
				////
    operator RiReal *();
				////
    operator const RiReal *() const;
  private:
				////
    RiReal d[3];
};


/***************************************************************
CLASS
    RiRGBConverter
    Abstract class for conversion to and from RiColorRGB

DESCRIPTION
     Currently does not convert to or from RiSpectrum

****************************************************************/

class RiRGBConverter {
  public:
    // GROUP: Constructors and assignment
    //// Destructor
    virtual ~RiRGBConverter();
    // GROUP: Members
				////
    virtual RiColorRGB 	FromXYZV(const RiColorXYZV &c) const = 0;
				////
    virtual RiColorXYZV ToXYZV(const RiColorRGB &c) const = 0;
};


/***************************************************************
CLASS
    RiRGBConvertLinear
     Linear (matrix) conversion plus gamma

DESCRIPTION
     Based on monitor chromaticities and gamma.

****************************************************************/

class RiRGBConvertLinear {
  public:
				// GROUP: Constructors and assignment
				//// Default Constructor
    RiRGBConvertLinear();
				// GROUP: Members
				//// set gamma (default is 2.5)
    void SetGamma(RiReal gamma);
				//// set the monitor chromaticites for conversions.
    void SetChromaticities(RiReal _rx, RiReal _ry, RiReal _gx, RiReal _gy, RiReal _bx, RiReal _by,
			   RiReal _wx, RiReal _wy, RiReal _wY);
				//// turn on clipping
    void SetClipping(bool on = true);
				////
    void ClipRGB(RiReal *rgb) const;
				////  Converts to screen range [0.0, 1.0]
    virtual RiColorRGB 	FromXYZV(const RiColorXYZV &c) const;
				////
    virtual RiColorXYZV ToXYZV(const RiColorRGB &c) const;
  private:
    RiReal gamma, iGamma;
    RiReal rx, ry, gx, gy, bx, by, wx, wy, wY;
    bool   clippingOn;
    RiReal toXYZ[3][3], fromXYZ[3][3];
};




#endif /* RICOLORRGB_H */