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 "disti_include.h"
#include "unhide_globals.h"
#include <iosfwd>   // Forward references for the stream operators
#include <string.h> // For memcmp
 
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()
    {
        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 = 255 )
    {
        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.
    /// \param color The color to copy from.
    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 = 1 )
    {
        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 = 1 )
    {
        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 = 255 )
    {
        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 A pointer to array of 4 unsigned chars containing rgba (0-255 range).
    unsigned char* RGBA() { return rgba; }
 
    /// Gets RGBA value
    /// \return A const pointer to array of 4 unsigned chars containing rgba (0-255 range).
    const unsigned char* RGBA() const { return rgba; }
 
    /** \return  RGBA value packed into a 32 bit unsigned int in host byte order */
    unsigned long RGBA_ULong() const
    {
        return ( rgba[ 0 ] << 24 ) | ( rgba[ 1 ] << 16 ) | ( rgba[ 2 ] << 8 ) | rgba[ 3 ];
    }
 
    /** \return  The Red component of this color */
    unsigned char R() const { return rgba[ 0 ]; }
 
    /** \return  The Green component of this color */
    unsigned char G() const { return rgba[ 1 ]; }
 
    /** \return  The Blue component of this color */
    unsigned char B() const { return rgba[ 2 ]; }
 
    /** \return  The Alpha component of this color */
    unsigned char A() 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 );
    }
 
    /// Assignment operator
    /// \param color The color to copy.
    /// \return The resulting color (this).
    GlsColor& operator=( const GlsColor& color )
    {
        if( &color != this )
        {
            memcpy( rgba, color.rgba, sizeof( unsigned char ) * 4 );
        }
        return *this;
    }
};
 
/// Stream out operator
/// \param outstr The stream to write to.
/// \param color The color to write to the stream.
/// \return The stream in its current state.
DISTI_EXPORT std::ostream& operator<<( std::ostream& outstr, const GlsColor& color );
 
/// Stream in operator
/// \param instr The stream to read from.
/// \param color The returned color to read from the stream.
/// \return The stream in its current state.
DISTI_EXPORT std::istream& operator>>( std::istream& instr, GlsColor& color );
 
/// Alias for backwards compatibility
typedef GlsColor glsColor;
 
} // namespace disti
 
#endif