find.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_BORDER_FIND_HH
# define MLN_BORDER_FIND_HH

# include <mln/core/internal/image_morpher.hh>


namespace mln
{

  namespace border
  {

    template <typename I>
    unsigned find(const Image<I>& ima);


# ifndef MLN_INCLUDE_ONLY

    namespace impl
    {

      template <typename I, typename T, typename S, typename E>
      inline
      unsigned find__(const mln::internal::image_morpher<I, T, S, E>& ima)
      {
        return border::find(*ima.delegatee_());
      }

      template <typename T, typename S, typename E>
      inline
      unsigned find__(const mln::internal::image_base<T, S, E>&)
      {
        return 0;
      }

      template <typename I>
      inline
      unsigned find_(trait::image::speed::any, const I& ima)
      {
        return border::impl::find__(ima);
      }

      template <typename I>
      inline
      unsigned find_(trait::image::speed::fastest, const I& ima)
      {
        return ima.border();
      }

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


    // Facade.

    template <typename I>
    inline
    unsigned find(const Image<I>& ima)
    {
      trace::entering("border::find");

      mln_precondition(exact(ima).is_valid());
      unsigned res = border::impl::find_(mln_trait_image_speed(I)(), exact(ima));

      trace::exiting("border::find");
      return res;
    }

# endif // ! MLN_INCLUDE_ONLY

  } // end of namespace mln::border

} // end of namespace mln


#endif // ! MLN_BORDER_FIND_HH