seeds2tiling.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_GEOM_SEEDS2TILING_HH
# define MLN_GEOM_SEEDS2TILING_HH


# include <map>

# include <mln/core/concept/neighborhood.hh>
# include <mln/core/site_set/p_queue.hh>
# include <mln/core/routine/duplicate.hh>
# include <mln/accu/stat/mean.hh>
# include <mln/estim/min_max.hh>
# include <mln/algebra/vec.hh>


namespace mln
{

  namespace geom
  {

    //
    template <typename I, typename N>
    mln_concrete(I) seeds2tiling (const Image<I>& ima_,
                                  const Neighborhood<N>& nbh);


# ifndef MLN_INCLUDE_ONLY

    namespace impl
    {

      //
      template <typename I, typename N>
      inline
      mln_concrete(I)
      seeds2tiling (const Image<I>& ima_,
                    const Neighborhood<N>& nbh_)
      {
        trace::entering("geom::impl::seed2tiling");

        mln_precondition(exact(ima_).is_valid());
        mln_precondition(exact(nbh_).is_valid());

        const I& ima = exact(ima_);
        mln_concrete(I) out = duplicate(ima_);
        const N& nbh = exact(nbh_);
        p_queue<mln_psite(I)> q;

        // Init.
        {
          mln_piter(I) p(ima.domain());
          mln_niter(N) n(nbh, p);

          for_all(p) if (ima(p) == 0)
            for_all(n) if (ima(n) != 0)
              {
                q.push(p);
                break;
              }
        }

        // Body.
        {
          while (! q.is_empty())
            {
              mln_psite(I) p = q.front();
              q.pop();
              if (out(p) != 0) // p has already been processed so ignore
                continue;

              mln_niter(N) n(nbh, p);
              for_all(n) if (ima.has(n))
                {
                  if (out(n) != 0)
                    out(p) = out(n);
                  else
                    q.push(n); // n may already be in the queue,
                               // yet we then queue again this psite
                }
            }
        }

        trace::exiting("geom::impl::seed2tiling");
        return out;
      }

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



    // Facade

    template <typename I, typename N>
    inline
    mln_concrete(I) seeds2tiling(const Image<I>& ima_, const Neighborhood<N>& nbh)
    {
      trace::entering("geom::seed2tiling");

      mln_precondition(exact(ima_).is_valid());
      mln_precondition(exact(nbh).is_valid());

      mln_concrete(I) output = impl::seeds2tiling(ima_, nbh);

      trace::exiting("geom::seed2tiling");
      return output;
    }


# endif // ! MLN_INCLUDE_ONLY

  } // end of namespace mln::geom

} // end of namespace mln


#endif // ! MLN_GEOM_SEEDS2TILING_HH