split.hh

// Copyright (C) 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_DATA_SPLIT_HH
# define MLN_DATA_SPLIT_HH

# include <mln/core/concept/image.hh>
# include <mln/value/rgb8.hh>


namespace mln
{

  namespace data
  {

      template <typename I, typename J>
      void
      split(const Image<I>& input_, Image<J>& r_, Image<J>& g_, Image<J>& b_);


# ifndef MLN_INCLUDE_ONLY


      template <typename I, typename J>
      void
      split(const Image<I>& input_, Image<J>& r_, Image<J>& g_, Image<J>& b_)
      {
        trace::entering("mln::data::split");

        const I& input = exact(input_);
        J& r = exact(r_);
        J& g = exact(g_);
        J& b = exact(b_);

        mln_assertion(input.is_valid());
        mlc_is(mln_value(I), value::rgb8)::check();
        // FIXME: add more checks.
        mlc_is(mln_trait_image_value_storage(I),
               trait::image::value_storage::one_block)::check();

        initialize(r, input);
        initialize(g, input);
        initialize(b, input);

        typedef const mln_value(I)* in_ptr_t;
        typedef mln_value(J)* out_ptr_t;

        in_ptr_t in_ptr = input.buffer();
        out_ptr_t
          r_ptr = r.buffer(),
          g_ptr = g.buffer(),
          b_ptr = b.buffer();

        for (unsigned n = 0; n < input.nelements(); ++n, ++in_ptr)
        {
          *r_ptr++ = in_ptr->red();
          *g_ptr++ = in_ptr->green();
          *b_ptr++ = in_ptr->blue();
        }

        trace::exiting("mln::data::split");
      }


# endif // ! MLN_INCLUDE_ONLY

  } // end of namespace mln::data

} // end of namespace mln

#endif // ! MLN_DATA_SPLIT_HH