like_ero_fun.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_ELEMENTARY_LIKE_ERO_FUN_HH
# define MLN_MORPHO_ELEMENTARY_LIKE_ERO_FUN_HH



# include <mln/morpho/includes.hh>


namespace mln
{

  namespace morpho
  {

    namespace elementary
    {

      template <typename A, typename F,
                typename I, typename N>
      mln_concrete(I)
      like_ero_fun(const Meta_Accumulator<A>& a, const F& f,
                   const Image<I>& input, const Neighborhood<N>& nbh);



# ifndef MLN_INCLUDE_ONLY

      namespace internal
      {

        struct f_accu
        {
          template <typename V, typename A>
          V operator()(const V& /*input_p*/, const A& a) const
          {
            return a.to_result();
          }
        };

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


      namespace impl
      {

        namespace generic
        {

          template <typename A, typename F,
                    typename I, typename N>
          mln_concrete(I)
          like_ero_fun(const Meta_Accumulator<A>& a_, const F& f,
                       const Image<I>& input_, const Neighborhood<N>& nbh_)
          {
            trace::entering("morpho::elementary::impl::generic::like_ero_fun");

            const I& input = exact(input_);
            const N& nbh   = exact(nbh_);

            mln_accu_with(A, mln_value(I)) a = accu::unmeta(exact(a_), mln_value(I)());
            extension::adjust_fill(input, nbh, a);

            mln_concrete(I) output;
            initialize(output, input);

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

            trace::exiting("morpho::elementary::impl::generic::like_ero_fun");
            return output;
          }

        } // end of namespace mln::morpho::elementary::impl::generic


        template <typename A, typename F,
                  typename I, typename N>
        mln_concrete(I)
        like_ero_fun_fastest(const Meta_Accumulator<A>& a_, const F& f,
                             const Image<I>& input_, const Neighborhood<N>& nbh_)
        {
          trace::entering("morpho::elementary::impl::like_ero_fun_fastest");

          const I& input = exact(input_);
          const N& nbh   = exact(nbh_);

          mln_accu_with(A, mln_value(I)) a = accu::unmeta(exact(a_), mln_value(I)());
          extension::adjust_fill(input, nbh, a);

          mln_concrete(I) output;
          initialize(output, input);

          mln_pixter(const I) p_in(input);
          mln_pixter(I) p_out(output);
          mln_nixter(const I, N) n(p_in, nbh);
          for_all_2(p_in, p_out)
            {
              a.take_as_init(p_in.val());
              for_all(n)
                a.take(n.val());
              p_out.val() = f(p_in.val(), a);
            }

          trace::exiting("morpho::elementary::impl::like_ero_fun_fastest");
          return output;
        }

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


      namespace internal
      {

        template <typename A, typename F,
                  typename I, typename N>
        mln_concrete(I)
        like_ero_fun_dispatch(metal::false_,
                              const A& a, const F& f,
                              const I& input, const N& nbh)
        {
          return impl::generic::like_ero_fun(a, f, input, nbh);
        }

        template <typename A, typename F,
                  typename I, typename N>
        mln_concrete(I)
        like_ero_fun_dispatch(metal::true_,
                              const A& a, const F& f,
                              const I& input, const N& nbh)
        {
          return impl::like_ero_fun_fastest(a, f, input, nbh);
        }

        template <typename A, typename F,
                  typename I, typename N>
        mln_concrete(I)
        like_ero_fun_dispatch(const A& a, const F& f,
                              const I& input, const N& nbh)
        {
          typedef mlc_equal(mln_trait_image_speed(I),
                            trait::image::speed::fastest) I_fastest;
          typedef mln_window(N) W;
          typedef mln_is_simple_window(W) N_simple;

          return like_ero_fun_dispatch(mlc_and(I_fastest, N_simple)(),
                                       a, f, input, nbh);
        }

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


      // Facade.

      template <typename A, typename F,
                typename I, typename N>
      mln_concrete(I)
      like_ero_fun(const Meta_Accumulator<A>& a, const F& f,
                   const Image<I>& input, const Neighborhood<N>& nbh)
      {
        return internal::like_ero_fun_dispatch(a, f,
                                               exact(input), exact(nbh));
      }

# endif // ! MLN_INCLUDE_ONLY

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

  } // end of namespace mln::morpho

} // end of namespace mln


#endif // ! MLN_MORPHO_ELEMENTARY_LIKE_ERO_FUN_HH