resize.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_RESIZE_HH
# define MLN_BORDER_RESIZE_HH


# include <mln/core/concept/image.hh>
# include <mln/core/routine/duplicate.hh>
# include <mln/core/routine/primary.hh>
# include <mln/border/get.hh>
# include <mln/data/fill.hh>


namespace mln
{

  namespace border
  {

    template <typename I>
    void resize(const Image<I>& ima, unsigned thickness);



# ifndef MLN_INCLUDE_ONLY

    namespace impl
    {

      template <typename I>
      inline
      void resize(I& ima, unsigned thickness)
      {
        if (border::get(ima) == thickness)
          return; // No-op.

        mln_concrete(I) memo = mln::duplicate(ima);
        ima.resize_(thickness);
        data::fill(ima, memo);

        mln_postcondition(border::get(ima) == thickness);
      }

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


    namespace internal
    {

      template <typename I>
      inline
      void resize_dispatch(trait::image::ext_domain::any,
                           const Image<I>& ima, unsigned thickness)
      {
        // No-op.
        (void) ima;
        (void) thickness;
      }

      template <typename I>
      inline
      void resize_dispatch(trait::image::ext_domain::extendable,
                           const Image<I>& ima, unsigned thickness)
      {
        // Effective resizing.
        impl::resize(const_cast<I&>(exact(ima)), thickness);
      }

      template <typename I>
      inline
      void resize_dispatch(const Image<I>& ima, unsigned thickness)
      {
        resize_dispatch(mln_trait_image_ext_domain(I)(),
                        ima, thickness);
      }

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



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

      mln_precondition(exact(ima).is_valid());

      // Try to resize the primary image behind ima.
      internal::resize_dispatch(primary(ima), thickness);

      trace::exiting("border::resize");
    }

# endif // ! MLN_INCLUDE_ONLY

  } // end of namespace mln::border

} // end of namespace mln


#endif // ! MLN_BORDER_RESIZE_HH