elementary.hh

// Copyright (C) 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_MORPHO_INTERNAL_ELEMENTARY_HH
# define MLN_MORPHO_INTERNAL_ELEMENTARY_HH


# include <mln/core/concept/image.hh>
# include <mln/core/concept/neighborhood.hh>
# include <mln/core/concept/accumulator.hh>
# include <mln/core/concept/meta_accumulator.hh>


namespace mln
{

  namespace morpho
  {

    namespace internal
    {

      template <typename A, typename I, typename N, typename O>
      mln_concrete(I)
        elementary(const I& input, const N& nbh, O oper);


# ifndef MLN_INCLUDE_ONLY

      namespace impl
      {

        // Different cases.

        template <typename I, typename N, typename A, typename O>
        mln_concrete(I)
          elementary_(mln::trait::image::speed::any,
                      const I& input, const N& nbh, A accu, O oper)
        {
          mln_concrete(I) output;
          initialize(output, input);

          mln_piter(I) p(input.domain());
          mln_niter(N) n(nbh, p);
          for_all(p)
            {
              accu.take_as_init(input(p));
              for_all(n) if (input.has(n))
                accu.take(input(n));
              output(p) = oper(accu, input(p));
            }

          return output;
        }

        // Selector.

        template <typename A, typename I, typename N, typename O>
        mln_concrete(I)
        elementary_selector_(const I& input, const N& nbh, O oper)
        {
          mln_accu_with(A, mln_value(I)) accu;
          return elementary_(mln_trait_image_speed(I)(),
                             input, nbh,
                             accu, oper);
        }

      } // end of namespace mln::morpho::internal::impl


      // Facade.

      template <typename A, typename I, typename N, typename O>
      mln_concrete(I)
        elementary(const I& input, const N& nbh, O oper)
      {
        return impl::elementary_selector_<A>(exact(input), exact(nbh), oper);
      }

# endif // ! MLN_INCLUDE_ONLY

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

  } // end of namespace mln::morpho

} // end of namespace mln


#endif // ! MLN_MORPHO_INTERNAL_ELEMENTARY_HH