value.hh

// Copyright (C) 2007, 2008, 2009 EPITA Research and Development
// Laboratory (LRDE)
//
// This file is part of Olena.
//
// Olena is free software: you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation, version 2 of the License.
//
// Olena 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
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Olena.  If not, see <http://www.gnu.org/licenses/>.
//
// As a special exception, you may use this file as part of a free
// software project without restriction.  Specifically, if other files
// instantiate templates or use macros or inline functions from this
// file, or you compile this file and link it with other files to produce
// an executable, this file does not by itself cause the resulting
// executable to be covered by the GNU General Public License.  This
// exception does not however invalidate any other reasons why the
// executable file might be covered by the GNU General Public License.

#ifndef MLN_LABELING_VALUE_HH
# define MLN_LABELING_VALUE_HH


# include <mln/core/concept/image.hh>
# include <mln/core/concept/neighborhood.hh>
# include <mln/canvas/labeling/video.hh>
# include <mln/data/fill.hh>



namespace mln
{

  namespace labeling
  {

    //
    template <typename I, typename N, typename L>
    mln_ch_value(I, L)
    value(const Image<I>& input, const mln_value(I)& val,
          const Neighborhood<N>& nbh, L& nlabels);


# ifndef MLN_INCLUDE_ONLY


    // Tests.

    namespace internal
    {

      template <typename I, typename N, typename L>
      void
      value_tests(const Image<I>& input, const mln_value(I)& val, const Neighborhood<N>& nbh,
                  L& nlabels)
      {
        mln_precondition(exact(input).is_valid());
        // mln_precondition(exact(nbh).is_valid());

        (void) input;
        (void) val;
        (void) nbh;
        (void) nlabels;
      }

    } // end of namespace mln::labeling::internal



    namespace impl
    {

      // Generic functor.

      template <typename I>
      struct value_functor
      {
        typedef mln_psite(I) P;

        const I& input;
        const mln_value(I)& val;

        // Requirements from mln::canvas::labeling.

        typedef mln_domain(I) S;

        // Generic implementation

        void init()                               {}
        bool handles(const P& p) const            { return input(p) == val; }
        bool equiv(const P& n, const P&) const    { return input(n) == val; }
        bool labels(const P&) const               { return true; }
        void do_no_union(const P&, const P&)  {}
        void init_attr(const P&)                  {}
        void merge_attr(const P&, const P&)       {}

        // Fastest implementation

        void init_()                              {}
        bool handles_(unsigned p) const           { return input.element(p) == val; }
        bool equiv_(unsigned n, unsigned) const   { return input.element(n) == val; }
        bool labels_(unsigned) const              { return true; }
        void do_no_union_(unsigned, unsigned)     {}
        void init_attr_(unsigned)                 {}
        void merge_attr_(unsigned, unsigned)      {}

        // end of Requirements.

        value_functor(const Image<I>& input_, const mln_value(I)& val)
          : input(exact(input_)),
            val(val)
        {
        }
      };

    } // end of namespace mln::labeling::impl




    // Facade.

    template <typename I, typename N, typename L>
    mln_ch_value(I, L)
    value(const Image<I>& input, const mln_value(I)& val,
          const Neighborhood<N>& nbh, L& nlabels)
    {
      trace::entering("labeling::value");

      internal::value_tests(input, val, nbh, nlabels);

      mln_ch_value(I, L) output;
      impl::value_functor<I> f(input, val);
      output = canvas::labeling::video(input, nbh, nlabels, f);

      trace::exiting("labeling::value");
      return output;
    }

# endif // ! MLN_INCLUDE_ONLY

  } // end of namespace mln::labeling

} // end of namespace mln


#endif // ! MLN_LABELING_VALUE_HH

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