builtin_components.h

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/*                       
             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
*/
#ifndef CVD_BUILTIN_TRAITS_H_
#define CVD_BUILTIN_TRAITS_H_

#include <limits>
#include <cstddef>

#include "TooN.h"

namespace CVD
{
  namespace Pixel
  {

    //The "Component" class gives us information about the pixel components, 
    //ie how many components there are and whay the type is.
        
    //We use a 2 layer thing here so that Component is only properly defined
    //for builtin types, unless explicitly overridden.

    template<class P, int spp> struct component_base {
      template<bool x> struct component_base_only_for_basic_types;
      static const int fail = sizeof(component_base_only_for_basic_types<false>);
    };
      
    template<class P> struct component_base<P, 1>
    {
    };

    //template <class P, int primitive = std::numeric_limits<P>::is_specialized> struct Component;

    template<class P> struct Component
    {
      typedef P type;
      static const size_t count = 1;
          
      static const P& get(const P& pixel, size_t)
      {
    return pixel;
      }

      static P& get(P& pixel, size_t)
      {
    return pixel;
      }
            
    };

    template<class P, int I> struct Component<P[I]>
    {
      typedef P type;
      static const size_t count=I;
      
      static const P& get(const P pixel[I], size_t i)
      {
    return pixel[i];
      }

      static inline P& get(P pixel[I], size_t i)
      {
    return pixel[i];
      }
    };

    template<int N> struct Component<TooN::Vector<N> >
    {
      typedef double type;
      static const size_t count=N;
      
      static const type& get(const TooN::Vector<N>& pixel, size_t i)
      {
    return pixel[i];
      }

      static inline type& get(TooN::Vector<N>& pixel, size_t i)
      {
    return pixel[i];
      }
    };

    template<int N, int M> struct Component<TooN::Matrix<N,M> >
    {
      typedef double type;
      static const size_t count=N*M;
      
      static const type& get(const TooN::Matrix<N,M>& pixel, size_t i)
      {
    return pixel[i/M][i%M];
      }

      static inline type& get(TooN::Matrix<N,M>& pixel, size_t i)
      {
    return pixel[i/M][i%M];
      }
    };
        
  }
}

#endif