gls_color.h

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/*! \file
  \brief  The Color class: Implements a 4 component RGBA color.

  \par Copyright Information

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*/
#ifndef _GLS_COLOR_H
#define _GLS_COLOR_H

#include <string.h>  // For memcmp
#include "disti_include.h"
#include "unhide_globals.h"
#include <iosfwd> // Forward references for the stream operators

namespace disti
{

/** \class glsColor
  The Color class: Implements a 4 component RGBA color.
*/
class glsColor
{
    unsigned char rgba[4];  /** Red, Green, Blue, Alpha 0-255 range */

public:

    /** default constructor. Intializes rgba data to zero */
    glsColor(void)
    {
        rgba[0] = rgba[1] = rgba[2] = rgba[3] = 0;
    }

    /** 4ub constructor.  Intializes using rgba values
      * \param r  Red value, range 0-255
      * \param g  Green value, range 0-255
      * \param b  Blue value, range 0-255
      * \param a  Alpha value, range 0-255
      */
    glsColor(unsigned char r,unsigned char g,unsigned char b,unsigned char a)
    { 
        rgba[0] = r; rgba[1] = g; rgba[2] = b; rgba[3] = a; 
    }

    /** 4ubv constructor.  Intializes using rgba value
      * \param newColor 4 character RGBA array, range 0-255
      */
    glsColor(const unsigned char newColor[])
    { 
        rgba[0] = newColor[0]; rgba[1] = newColor[1]; rgba[2] = newColor[2]; rgba[3] = newColor[3]; 
    }

    /** 4ul constructor.
      * \param rgbaVal  Unsigned long containing color in the form RRGGBBAA (8 bits per component 
      */
    glsColor(unsigned long rgbaVal)
    {
        rgba[0] = (unsigned char)((rgbaVal & 0xFF000000) >> 24);
        rgba[1] = (unsigned char)((rgbaVal & 0x00FF0000) >> 16);
        rgba[2] = (unsigned char)((rgbaVal & 0x0000FF00) >> 8);
        rgba[3] = (unsigned char)((rgbaVal & 0x000000FF));
    }

    /** copy constructor.  */
    glsColor(const glsColor& color)
    { 
        memcpy(rgba, color.rgba, sizeof(unsigned char) * 4);
    }

    /** Sets RGBA value using floats
      * \param r  Red value, range 0-1.0
      * \param g  Green value, range 0-1.0
      * \param b  Blue value, range 0-1.0
      * \param a  Alpha value, range 0-1.0
      */
    void SetRGBA4f(float r,float g,float b,float a)
    { 
        rgba[0] = (unsigned char)(r*255.0f); 
        rgba[1] = (unsigned char)(g*255.0f); 
        rgba[2] = (unsigned char)(b*255.0f); 
        rgba[3] = (unsigned char)(a*255.0f); 
    }

    /** Gets RGBA value using floats
      * \param r  Red value, range 0-1.0
      * \param g  Green value, range 0-1.0
      * \param b  Blue value, range 0-1.0
      * \param a  Alpha value, range 0-1.0
      */
    void GetRGBA4f(float &r,float &g,float &b,float &a) const
    {
        r = (float)rgba[0] / 255.0f;
        g = (float)rgba[1] / 255.0f;
        b = (float)rgba[2] / 255.0f;
        a = (float)rgba[3] / 255.0f;
    }

    /** Sets RGBA value using doubles
      * \param r  Red value, range 0-1.0
      * \param g  Green value, range 0-1.0
      * \param b  Blue value, range 0-1.0
      * \param a  Alpha value, range 0-1.0
      */
    void SetRGBA4d(double r,double g,double b,double a)
    { 
        rgba[0] = (unsigned char)(r*255.0); 
        rgba[1] = (unsigned char)(g*255.0); 
        rgba[2] = (unsigned char)(b*255.0); 
        rgba[3] = (unsigned char)(a*255.0); 
    }

    /** Gets RGBA value using doubles
      * \param r  Red value, range 0-1.0
      * \param g  Green value, range 0-1.0
      * \param b  Blue value, range 0-1.0
      * \param a  Alpha value, range 0-1.0
      */
    void GetRGBA4d(double &r,double &g,double &b,double &a) const
    {
        r = (double)rgba[0] / 255.0;
        g = (double)rgba[1] / 255.0;
        b = (double)rgba[2] / 255.0;
        a = (double)rgba[3] / 255.0;
    }

    /** Sets RGBA value
      * \param r  Red value, range 0-255
      * \param g  Green value, range 0-255
      * \param b  Blue value, range 0-255
      * \param a  Alpha value, range 0-255
      */
    void RGBA(unsigned char r,unsigned char g,unsigned char b,unsigned char a)
    { 
        rgba[0] = r; rgba[1] = g; rgba[2] = b; rgba[3] = a; 
    }

    /** Sets RGBA value
      * \param newColor 4 character RGBA array, range 0-255
      */
    void RGBA(const unsigned char newColor[])
    { 
        memcpy(rgba, newColor, sizeof(unsigned char) * 4);
    }

    /** Sets RGBA value
      * \param rgbaVal  Unsigned long containing color in the form RRGGBBAA (8 bits per component 
      */
    void RGBA(unsigned long rgbaVal)
    {
        rgba[0] = (unsigned char)((rgbaVal & 0xFF000000) >> 24);
        rgba[1] = (unsigned char)((rgbaVal & 0x00FF0000) >> 16);
        rgba[2] = (unsigned char)((rgbaVal & 0x0000FF00) >> 8);
        rgba[3] = (unsigned char)((rgbaVal & 0x000000FF));
    }

    /** Gets RGBA value
      * \return Pointer to array of 4 unsigned chars containing rgba (0-255 range)
      */
    unsigned char *RGBA(void) { return rgba; }
    const unsigned char *RGBA(void) const { return rgba; }

    /** \return  RGBA value packed into a 32 bit unsigned int in host byte order */
    unsigned long RGBA_ULong(void) const 
    { 
         return (rgba[0] << 24) | (rgba[1] << 16) | (rgba[2] << 8) | rgba[3];
    }

    /** \return  The Red component of this color */
    unsigned char R(void) const { return rgba[0]; }

    /** \return  The Green component of this color */
    unsigned char G(void) const { return rgba[1]; }

    /** \return  The Blue component of this color */
    unsigned char B(void) const { return rgba[2]; }

    /** \return  The Alpha component of this color */
    unsigned char A(void) const { return rgba[3]; }

    /** Set the Red component of this color
      * \param val  The new value for the component
      */
    void R(const unsigned char val) { rgba[0] = val; }

    /** Set the Green component of this color
      * \param val  The new value for the component
      */
    void G(const unsigned char val) { rgba[1] = val; }

    /** Set the Blue component of this color
      * \param val  The new value for the component
      */
    void B(const unsigned char val) { rgba[2] = val; }

    /** Set the Alpha component of this color
      * \param val  The new value for the component
      */
    void A(const unsigned char val) { rgba[3] = val; }

    /** Determines if the color is identical to the supplied color
      \param arg color to compare to
      \return TRUE if equal, else FALSE
      */
    bool operator == (const glsColor &arg) const
        { return 0 == memcmp(rgba, arg.rgba, sizeof(unsigned char) * 4); }

    /** Determines if the color is NOT identical to the supplied color
      \param arg color to compare to
      \return TRUE if NOT equal, else FALSE
      */
    bool operator != (const glsColor &arg) const
        { return 0 != memcmp(rgba, arg.rgba, sizeof(unsigned char) * 4); }

    /** Copy another color into this one */
    glsColor& operator = (const glsColor& color)
    {
        if (&color != this)
        {
            memcpy(rgba, color.rgba, sizeof(unsigned char) * 4);
        }
        return *this;
    }

};

DISTI_EXPORT std::ostream & operator<<(std::ostream & outstr, const glsColor & color);
DISTI_EXPORT std::istream & operator>>(std::istream & instr, glsColor & color);

} // namespace disti

#endif