directional.hh

// Copyright (C) 2007, 2008, 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_CANVAS_BROWSING_DIRECTIONAL_HH
# define MLN_CANVAS_BROWSING_DIRECTIONAL_HH


# include <mln/core/concept/browsing.hh>
# include <mln/core/concept/image.hh>

namespace mln
{

  namespace canvas
  {

    namespace browsing
    {


      struct directional_t : public Browsing< directional_t >
      {
        template <typename F>
        void operator()(F& f) const;
      };

      extern const directional_t directional;

# ifndef MLN_INCLUDE_ONLY

#  ifndef MLN_WO_GLOBAL_VARS

      const directional_t directional;

# endif // ! MLN_WO_GLOBAL_VARS

      template <typename F>
      inline
      void
      directional_t::operator()(F& f) const
      {
        trace::entering("canvas::browsing::directional");
        mln_precondition(f.dir < f.dim);
        typedef typename F::I I;

        mln_psite(I)
          pmin = f.input.domain().pmin(),
          pmax = f.input.domain().pmax();

        f.p = pmin;

        f.init();

        do
        {

          // Browse the run
          f.init_run();
          while (f.p[f.dir] <= pmax[f.dir])
          {
            f.next();
            ++f.p[f.dir];
          }
          f.p[f.dir] = pmin[f.dir];


          // Select the next run start
          for (int c = F::dim - 1; c >= 0; --c)
          {
            if (c == int(f.dir))
              continue;
            if (f.p[c] != pmax[c])
            {
              ++f.p[c];
              break;
            }
            f.p[c] = pmin[c];
          }

        } while (f.p != pmin);

        f.final();
        trace::exiting("canvas::browsing::directional");
      }

# endif // ! MLN_INCLUDE_ONLY

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

  } // end of namespace mln::canvas

} // end of namespace mln

#endif // ! MLN_CANVAS_BROWSING_DIRECTIONAL_HH