load.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_IO_PFM_LOAD_HH
# define MLN_IO_PFM_LOAD_HH


# include <iostream>
# include <fstream>

# include <mln/core/image/image2d.hh>
# include <mln/value/int_u8.hh>


namespace mln
{

  namespace io
  {

    namespace pfm
    {

      void load(image2d<float>& ima,
                const std::string& filename);

      image2d<float> load(const std::string& filename);

# ifndef MLN_INCLUDE_ONLY

      namespace internal
      {

        inline
        void abort()
        {
          std::cerr << " aborting." << std::endl;
          exit(0);
        }

        inline
        bool read_pfm_header(std::istream& file,
                             int& nrows, int& ncols,
                             bool test = false)
        {
          std::string tag;

          // get size
          file >> nrows;
          file >> ncols;

          if (file.get() != '\n')
            goto err;

          // check tag == float
          file >> tag;
          if (tag != "float")
            goto err;

          if (file.get() != '\n')
            goto err;

          return true;

        err:
          if (! test)
            {
              std::cerr << "error: badly formed header!"
                        << std::endl;
              abort();
            }
          return false;
        }


        template <typename I>
        inline
        void load_raw_2d(std::ifstream& file, I& ima)
        {
          point2d p = point2d(0, 0);

          const mln_deduce(I, site, coord)
            min_row = geom::min_row(ima),
            max_row = geom::max_row(ima);

          unsigned int
            ncols = geom::ncols(ima);

          for (p.row() = min_row; p.row() <= max_row; ++p.row())
            file.read((char*)(&(ima(p))),
                      sizeof(float) * ncols);

        }


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

      inline
      image2d<float> load(const std::string& filename)
      {
        trace::entering("mln::io::pfm::load");

        std::ifstream file(filename.c_str());
        if (! file)
          {
            std::cerr << "error: file '" << filename
                      << "' not found!";
            abort();
          }
        int nrows, ncols;
        internal::read_pfm_header(file, nrows, ncols);

        image2d<float> ima(nrows, ncols);
        internal::load_raw_2d(file, ima);

        trace::exiting("mln::io::pfm::load");

        return ima;
      }


      inline
      void load(image2d<float>& ima,
                const std::string& filename)
      {
        ima = load(filename);
      }

# endif // ! MLN_INCLUDE_ONLY

    } // end of namespace mln::io::pfm

  } // end of namespace mln::io

} // end of namespace mln


#endif // ! MLN_IO_PFM_LOAD_HH