Commit a04c2ef9 authored by Guillaume Lazzara's avatar Guillaume Lazzara
Browse files

Add merge::components routine.

parent 187ea036
// 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.
/// \file
///
///
#ifndef SCRIBO_PRIMITIVE_MERGE_COMPONENTS_HH
# define SCRIBO_PRIMITIVE_MERGE_COMPONENTS_HH
# include <mln/core/image/vmorph/fun_image.hh>
namespace scribo
{
namespace primitive
{
namespace merge
{
using namespace mln;
# ifndef MLN_INCLUDE_ONLY
namespace internal
{
template <typename V>
struct rebase_label : mln::Function_v2v<rebase_label<V> >
{
typedef V result;
rebase_label()
: base_label_(0)
{}
rebase_label(const V& base_label)
: base_label_(base_label)
{}
V operator()(const V& v) const
{
if (v)
return unsigned(base_label_) + unsigned(v);
return literal::zero;
}
V base_label_;
};
} // end of namespace scribo::primitive::merge
template <typename L>
component_set<L>
components(const component_set<L>& lhs, const component_set<L>& rhs)
{
trace::entering("scribo::primitive::merge::components");
const L& lhs_lbl = lhs.labeled_image();
const L& rhs_lbl = rhs.labeled_image();
typedef mln_value(L) V;
V nlabels = unsigned(lhs.nelements()) + unsigned(rhs.nelements());
// Merge labeled images.
//
// Rebase labeling in the second image, according to the
// number of labels in the first one.
//
L lbl_merge = duplicate(lhs_lbl);
internal::rebase_label<V> f(lhs.nelements());
fun_image<internal::rebase_label<V>, L> fima(f, rhs_lbl);
data::fill((lbl_merge | (pw::value(lbl_merge) == pw::cst(0))).rw(), fima);
component_set<L> output(lbl_merge, nlabels);
trace::exiting("scribo::primitive::merge::components");
return output;
}
# endif // ! MLN_INCLUDE_ONLY
} // end of namespace scribo::primitive::merge
} // end of namespace scribo::primitive
} // end of namespace scribo
#endif // ! SCRIBO_PRIMITIVE_MERGE_COMPONENTS_HH
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