blobs.hh

// Copyright (C) 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_CANVAS_LABELING_BLOBS_HH
# define MLN_CANVAS_LABELING_BLOBS_HH


# include <mln/core/concept/image.hh>
# include <mln/core/concept/neighborhood.hh>
# include <mln/data/fill.hh>
# include <mln/core/site_set/p_queue_fast.hh>

# include <mln/util/pix.hh>

namespace mln
{

  namespace canvas
  {

    namespace labeling
    {

      template <typename I, typename N, typename L, typename F>
      mln_ch_value(I, L)
      blobs(const Image<I>& input_, const Neighborhood<N>& nbh_,
            L& nlabels, F& functor);



# ifndef MLN_INCLUDE_ONLY


      // Implementations.

      namespace impl
      {

        // Generic implementation.

        namespace generic
        {

          template <typename I, typename N, typename L, typename F>
          mln_ch_value(I, L)
          blobs(const I& input, const N& nbh, L& nlabels, F& functor)
          {
            typedef mln_psite(I) P;

            P cur;
            mln_niter(N) n(nbh, cur);
            p_queue_fast<P> qu;
            const L zero = literal::zero;

            // Initialization.
            nlabels = literal::zero;
            typedef mln_ch_value(I, L) out_t;
            out_t output;
            initialize(output, input);
            data::fill(output, zero);
            functor.init(); // <-- functor.init()

            // Loop.
            mln_piter(I) p(input.domain());
            for_all(p)
              if (input(p) && output(p) == zero) // Object point, not labeled yet.
              {
                // Label this point component.
                if (nlabels == mln_max(L))
                {
                  trace::warning("labeling aborted! Too many labels \
for this label type: nlabels > max(label_type).");

                  return output;
                }
                ++nlabels;
                functor.new_label(nlabels); // <-- functor.new_label()
                mln_invariant(qu.is_empty());
                qu.push(p);
                output(p) = nlabels;
                functor.process_p(util::pix<out_t>(output, p)); // <-- functor.process_p()
                do
                {
                  cur = qu.front();
                  qu.pop();
                  for_all(n) if (input.has(n))
                    if (input(n) && output(n) == zero)
                    {
                      mln_invariant(! qu.compute_has(n));
                      qu.push(n);
                      output(n) = nlabels;
                      functor.process_n(util::pix<out_t>(output, n)); // <-- functor.process_n()
                    }
                }
                while (! qu.is_empty());
              }

            functor.finalize(); // <-- functor.finalize()
            return output;
          }

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

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



      // Facade.

      template <typename I, typename N, typename L, typename F>
      inline
      mln_ch_value(I, L)
      blobs(const Image<I>& input_, const Neighborhood<N>& nbh_,
            L& nlabels, F& functor)
      {
        trace::entering("labeling::blobs");
        mlc_equal(mln_trait_image_kind(I),
                  mln::trait::image::kind::binary)::check();
        const I& input = exact(input_);
        const N& nbh = exact(nbh_);
        mln_precondition(input.is_valid());

        // The only implementation is the generic one.
        mln_ch_value(I, L)
          output = impl::generic::blobs(input, nbh, nlabels, functor);

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


# endif // ! MLN_INCLUDE_ONLY

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

  } // end of namespace mln::canvas

} // end of namespace mln


#endif // ! MLN_CANVAS_LABELING_BLOBS_HH

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