window2d.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_CORE_ALIAS_WINDOW2D_HH
# define MLN_CORE_ALIAS_WINDOW2D_HH


# include <mln/core/window.hh>
# include <mln/core/alias/dpoint2d.hh>
# include <mln/metal/math/sqrt.hh>
# include <mln/convert/from_to.hxx>


namespace mln
{

  //
  typedef window<mln::dpoint2d> window2d;


  const window2d& win_c4p();


  const window2d& win_c8p();


  namespace convert
  {

    namespace over_load
    {

      template <unsigned S>
      void from_to_(const bool (&values)[S], window2d& win);

      template <unsigned R, unsigned C>
      void from_to_(const bool (&values)[R][C], window2d& win);

    } // end of namespace mln::convert::over_load

  } // end of namespace mln::convert



# ifndef MLN_INCLUDE_ONLY

  inline const window2d&
  win_c4p()
  {
    static window2d it;
    if (it.size() == 0)
      {
        it
          .insert( 0, -1)
          .insert(-1,  0)
          .insert( 0,  0)
          .insert(+1,  0)
          .insert( 0, +1);
      }
    return it;
  }

  inline const window2d&
  win_c8p()
  {
    static window2d it;
    if (it.size() == 0)
      {
        it
          .insert(-1, -1)
          .insert( 0, -1)
          .insert(+1, -1)
          .insert(-1,  0)
          .insert( 0,  0)
          .insert(+1,  0)
          .insert(-1, +1)
          .insert( 0, +1)
          .insert(+1, +1);
      }
    return it;
  }


  namespace convert
  {

    namespace over_load
    {

      template <unsigned S>
      void
      from_to_(const bool (&values)[S], window2d& win)
      {
        enum { H = mlc_sqrt_int(S) / 2 };
        mlc_bool((2 * H + 1) * (2 * H + 1) == S)::check();
        win.clear();
        unsigned i = 0;
        const def::coord
          h  = static_cast<def::coord>(H),
          _h = static_cast<def::coord>(-h);
        for (def::coord row = _h; row <= h; ++row)
          for (def::coord col = _h; col <= h; ++col)
            if (values[i++])
              win.insert(row, col);
      }

      template <unsigned R, unsigned C>
      void
      from_to_(const bool (&values)[R][C], window2d& win)
      {
        mlc_bool(R % 2 == 1)::check();
        mlc_bool(C % 2 == 1)::check();
        win.clear();
        const def::coord
          drow  = static_cast<def::coord>(R / 2),
          _drow = static_cast<def::coord>(- drow),
          dcol  = static_cast<def::coord>(C / 2),
          _dcol = static_cast<def::coord>(- dcol);
        for (def::coord row = _drow; row <= drow; ++row)
          for (def::coord col = _dcol; col <= dcol; ++col)
            if (values[row + drow][col + dcol])
              win.insert(row, col);
      }

    } // end of namespace mln::convert::over_load

  } // end of namespace mln::convert

# endif // ! MLN_INCLUDE_ONLY

} // end of namespace mln


#endif // ! MLN_CORE_ALIAS_WINDOW2D_HH