cvd/rgb.h

/*                       
             This file is part of the CVD Library.

             Copyright (C) 2005 The Authors

             This library is free software; you can redistribute it and/or
             modify it under the terms of the GNU Lesser General Public
             License as published by the Free Software Foundation; either
             version 2.1 of the License, or (at your option) any later version.

             This library is distributed in the hope that it will be useful,
             but WITHOUT ANY WARRANTY; without even the implied warranty of
             MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
             Lesser General Public License for more details.

             You should have received a copy of the GNU Lesser General Public
             License along with this library; if not, write to the Free Software
             Foundation, Inc., 
             51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
*/
//                                                                      //
//  rgb.h                                                               //
//                                                                      //
//  Contains definitions of Rgb template class                          //
//                                                                      //
//  derived from IPRS_* developed by Tom Drummond                       //
//                                                                      //
#ifndef CVD_RGB_H
#define CVD_RGB_H

#include <iostream>

#include <cvd/byte.h>

#include <cvd/internal/is_pod.h>

namespace CVD {

template <class T>
class Rgb
{
public:
  explicit Rgb() : red(0), green(0), blue(0) {}

  explicit inline Rgb(T r, T g, T b) : red(r),green(g),blue(b) {}

  template <class S> inline explicit Rgb(const Rgb<S>& rgb) : red(static_cast<T>(rgb.red)), green(static_cast<T>(rgb.green)), blue(static_cast<T>(rgb.blue)) {}

  T red;   
  T green; 
  T blue;  
   
    inline Rgb<T>& operator=(const Rgb<T>& c)
    {red = c.red; green = c.green; blue = c.blue; return *this;}
        
  inline bool operator==(const Rgb<T>& c) const
  {return red == c.red && green == c.green && blue == c.blue;}
          
  inline bool operator!=(const Rgb<T>& c) const
  {return red != c.red || green != c.green || blue != c.blue;}

  template <class T2>
  inline Rgb<T>& operator=(const Rgb<T2>& c){
    red = static_cast<T>(c.red);
    green = static_cast<T>(c.green);
    blue = static_cast<T>(c.blue);
    return *this;
  }

  //   T to_grey() {return 0.3*red + 0.6*green + 0.1*blue;}
};
  
template <class T>
std::ostream& operator <<(std::ostream& os, const Rgb<T>& x)
{
  return os << "(" << x.red << "," << x.green << ","
        << x.blue << ")";
}

inline std::ostream& operator <<(std::ostream& os, const Rgb<char>& x)
{
  return os << "(" << (int)(unsigned char)x.red << ","
        << (int)(unsigned char)x.green << ","
        << (int)(unsigned char)x.blue << ")";
}

inline std::ostream& operator <<(std::ostream& os, const Rgb<byte>& x)
{
  return os << "(" << static_cast<int>(x.red) << ","
        << static_cast<int>(x.green) << ","
        << static_cast<int>(x.blue) << ")";
}

#ifndef DOXYGEN_IGNORE_INTERNAL
namespace Internal
{
  template<class C> struct is_POD<Rgb<C> >
  {
    enum { is_pod = is_POD<C>::is_pod };
  };
}
#endif


} // end namespace
#endif