superpose.hh

// Copyright (C) 2009, 2010 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_SUPERPOSE_HH
# define MLN_LABELING_SUPERPOSE_HH



# include <mln/core/concept/image.hh>
# include <mln/util/array.hh>
# include <mln/labeling/relabel.hh>
# include <mln/data/paste.hh>
# include <mln/pw/all.hh>

# include <mln/value/next.hh>
# include <mln/value/equiv.hh>

namespace mln
{

  namespace labeling
  {


    template <typename I, typename J>
    mln_concrete(I)
    superpose(const Image<I>& lhs, const mln_value(I)& lhs_nlabels,
              const Image<J>& rhs, const mln_value(J)& rhs_nlabels,
              mln_value(I)& new_nlabels);




# ifndef MLN_INCLUDE_ONLY

    template <typename I, typename J>
    mln_concrete(I)
    superpose(const Image<I>& lhs_, const mln_value(I)& lhs_nlabels,
              const Image<J>& rhs_, const mln_value(J)& rhs_nlabels,
              mln_value(I)& new_nlabels)
    {
      trace::entering("mln::labeling::superpose");

      const I& lhs = exact(lhs_);
      const J& rhs = exact(rhs_);

      mlc_converts_to(mln_value(I), mln_value(J))::check();
      mln_precondition(lhs.is_valid());
      mln_precondition(rhs.is_valid());
      mln_precondition(lhs.domain() == rhs.domain());

      mln_concrete(I) output = duplicate(lhs);

      util::array<mln_value(J)>
        rebase_lbl(value::next(rhs_nlabels));

      rebase_lbl(0) = 0;
      for (unsigned i = 1; i <= rhs_nlabels; ++i)
        rebase_lbl(i) = i + value::equiv(lhs_nlabels);

      data::paste(labeling::relabel(rhs, rhs_nlabels, rebase_lbl)
                  | (pw::value(rhs) != pw::cst(literal::zero)),
                  output);

      new_nlabels = value::equiv(lhs_nlabels)
                    + value::equiv(rhs_nlabels) + 1;

      trace::exiting("mln::labeling::superpose");
      return output;
    }


# endif // ! MLN_INCLUDE_ONLY

  } // end of namespace mln::labeling

} // end of namespace mln


#endif // ! MLN_LABELING_SUPERPOSE_HH