ppm23.cc

// 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.

#include <mln/core/image/image2d.hh>
#include <mln/win/rectangle2d.hh>

#include <mln/value/rgb8.hh>

#include <mln/io/ppm/load.hh>
#include <mln/io/ppm/save.hh>

#include <mln/data/compare.hh>

#include "tests/data.hh"


using namespace mln;

typedef value::rgb<23> rgb23;

struct to23bits : mln::Function_v2v<to23bits>
{

  typedef rgb23 result;
  result operator()(value::rgb8 v) const
  {
    result ret(v.red().to_enc() * 256,
               v.green().to_enc() * 256,
               v.blue().to_enc() * 256);
    return ret;
  }
};

struct to8bits : mln::Function_v2v<to8bits>
{

  typedef value::rgb8 result;
  result operator()(rgb23 v) const
  {
    result ret(v.red().to_enc() / 256,
               v.green().to_enc() / 256,
               v.blue().to_enc() / 256);
    return ret;
  }
};

int main()
{
  using namespace mln;
  using value::rgb8;

  typedef image2d<rgb8> I;


  // load a 8-bit image A
  image2d<rgb8> a = io::ppm::load<rgb8>(MLN_IMG_DIR "/lena.ppm");
  image2d<rgb23> b(a.domain());

  image2d<rgb8>::fwd_piter  p(b.domain());

  // save it as a 23-bit ppm image B
  to23bits f;
  for_all(p)
    b(p) = f(a(p));
  io::ppm::save(b, "out23.ppm");

  // reload B into C
  image2d<rgb23>
    c = io::ppm::load<rgb23>("out23.ppm");
  image2d<rgb8> d(a.domain());


  // save C as a 8-bit ppm image D
  to8bits g;
  for_all(p)
    d(p) = g(c(p));
  io::ppm::save(d, "out8.ppm");

  // D should equals A
  mln_assertion(d == a);

}

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