URL: https://svn.lrde.epita.fr/svn/oln/trunk/milena ChangeLog: 2009-03-04 Etienne FOLIO &lt;folio(a)lrde.epita.fr&gt; New fast front propagation. * sandbox/folio/distance_front_new.hh: New fast front propagation (not tested). --- distance_front_new.hh | 415 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 415 insertions(+) Index: trunk/milena/sandbox/folio/distance_front_new.hh =================================================================== --- trunk/milena/sandbox/folio/distance_front_new.hh (revision 0) +++ trunk/milena/sandbox/folio/distance_front_new.hh (revision 3475) @@ -0,0 +1,415 @@ +// Copyright (C) 2008 EPITA Research and Development Laboratory (LRDE) +// +// This file is part of the Olena Library. This library is free +// software; you can redistribute it and/or modify it under the terms +// of the GNU General Public License version 2 as published by the +// Free Software Foundation. +// +// This library 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 this library; see the file COPYING. If not, write to +// the Free Software Foundation, 51 Franklin Street, Fifth Floor, +// Boston, MA 02111-1307, USA. +// +// As a special exception, you may use this file as part of a free +// software library 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_CANVAS_DISTANCE_FRONT_HH +# define MLN_CANVAS_DISTANCE_FRONT_HH + +/// \file mln/canvas/distance_front.hh +/// +/// Discrete distance canvas by front propagation. + +# include <vector> +# include <mln/core/concept/image.hh> +# include <mln/core/concept/neighborhood.hh> +# include <mln/core/concept/weighted_window.hh> +# include <mln/data/fill.hh> +# include <mln/accu/max.hh> + +//# include <mln/core/routine/duplicate.hh> +//# include <mln/core/site_set/p_queue_fast.hh> +//# include <queue> +//# include <mln/extension/adjust_fill.hh> + + +namespace mln +{ + + namespace canvas + { + + /// Discrete front distance canvas. + template <typename I, + typename N, typename W, typename D, + typename F> + mln_ch_value(I, D) + distance_front(const Image<I>& input, + const Neighborhood<N>& nbh, const Weighted_Window<W>& w_win, D max, + F& functor); + + + +# ifndef MLN_INCLUDE_ONLY + + + // Tests. + + namespace internal + { + + template <typename I, + typename N, typename W, typename D, + typename F> + void + distance_front_tests(const Image<I>& input_, + const Neighborhood<N>& nbh, const Weighted_Window<W>& w_win, D max, + F& functor) + { + const I& input = exact(input_); + const N& nbh = exact(nbh_); + + mln_precondition(input.is_valid()); + mln_precondition(nbh.is_valid()); + + (void) input; + (void) nbh; + (void) max; + (void) functor; + } + + + } // of namespace mln::canvas::internal + + + + // Implementations. + + namespace impl + { + + namespace generic + { + + template <typename I, + typename N, typename W, typename D, + typename F> + mln_ch_value(I, D) + distance_front(const Image<I>& input_, + const Neighborhood<N>& nbh, const Weighted_Window<W>& w_win, D max, + F& functor) + { + trace::entering("canvas::impl::generic::distance_front"); + + const I& input = exact(input_); + const N& nbh = exact(nbh_); + const W& w_win = exact(w_win_); + + mln_precondition(input.is_valid()); + mln_precondition(w_win.is_valid()); + + typedef mln_site(I) P; + typedef std::vector<P> bucket_t; + + // Distance map. + mln_ch_value(I, D) dmap; + initialize(dmap, input); + data::fill(dmap, max); + + // Mod determination. + unsigned mod; + { + accu::max<unsigned> m; + for (unsigned i = 0; i < w_win.size(); ++i) + m.take(w_win.w(i)); + mod = unsigned(m) + 1; + } + + // Aux data. + std::vector<bucket_t> bucket(mod); + unsigned bucket_size = 0; + + // Initialization. + { + functor.init(input); // <-- init + mln_piter(I) p(input.domain()); + mln_niter(N) n(nbh, p); + for_all(p) + if (functor.inqueue_p_wrt_input_p(input(p))) // <-- inqueue_p_wrt_input_p + { + dmap(p) = 0; + for_all(n) + if (input.domain().has(n) && + functor.inqueue_p_wrt_input_n(input(n))) // <-- inqueue_p_wrt_input_n + { + bucket[0].push_back(p); + ++bucket_size; + break; + } + } + } + + // Propagation. + { + P p; + mln_qiter(W) q(w_win, p); + for (unsigned d = 0; bucket_size != 0; ++d) + { + bucket_t& bucket_d = bucket[d % mod]; + for (unsigned i = 0; i < bucket_d.size(); ++i) + { + p = bucket_d[i]; + + if (dmap(p) == max) + { + // Saturation so stop. + bucket_size = bucket_d.size(); // So at end bucket_size == 0. + break; + } + + if (dmap(p) < d) + // p has already been processed, having a distance less than d. + continue; + + for_all(q) + if (dmap.domain().has(q) && dmap(q) > d) + { + unsigned d_ = d + q.w(); + if (d_ < dmap(q)) + { + dmap(q) = d_; + functor.process(p, q); // <- process + bucket[d_ % mod].push_back(q); + ++bucket_size; + } + } + } + bucket_size -= bucket_d.size(); + bucket_d.clear(); + } + + trace::exiting("canvas::impl::generic::distance_front"); + return dmap; + } + } + + } // of namespace mln::canvas::impl::generic + + + + // Fastest version. + + template <typename I, + typename N, typename W, typename D, + typename F> + mln_ch_value(I, D) + distance_front_fastest(const Image<I>& input_, + const Neighborhood<N>& nbh, const Weighted_Window<W>& w_win, + D max, F& functor) + { + trace::entering("canvas::impl::distance_front_fastest"); + + const I& input = exact(input_); + const N& nbh = exact(nbh_); + const W& w_win = exact(w_win_); + +// mln_precondition(input.is_valid()); // ?x +// mln_precondition(w_win.is_valid()); // ?x + extension::adjust(input, w_win); // ? + +// typedef mln_site(I) P; + typedef std::vector<unsigned> bucket_t; + + // Distance map. + mln_ch_value(I, D) dmap; + initialize(dmap, input); + data::fill(dmap, max); + + // Mod determination. + unsigned mod; + { + accu::max<unsigned> m; + for (unsigned i = 0; i < w_win.size(); ++i) + m.take(w_win.w(i)); + mod = unsigned(m) + 1; + } + + // Aux data. + std::vector<bucket_t> bucket(mod); + unsigned bucket_size = 0; + + // Initialization. + { + functor.init_(input); // <-- init + + // For the extension to be ignored: // ? + extension::fill(input, true); // ? + extension::fill(dmap, D(0)); // ? + + mln_pixter(const I) p(input); + mln_nixter(const I, N) n(p, nbh); + for_all(p) + if (functor.inqueue_p_wrt_input_p_(input(p))) // <-- inqueue_p_wrt_input_p + { + dmap.element(p.offset()) = 0; + for_all(n) + if (functor.inqueue_p_wrt_input_n_(n.val())) // <-- inqueue_p_wrt_input_n + { + bucket[0].push_back(p.offset()); + ++bucket_size; + break; + } + } + } + + // Propagation. + { + unsigned p; + + mln_qiter(W) q(w_win, p); // ?x- + + for (unsigned d = 0; bucket_size != 0; ++d) + { + bucket_t& bucket_d = bucket[d % mod]; + for (unsigned i = 0; i < bucket_d.size(); ++i) + { + p = bucket_d[i]; + + if (dmap.element(p) == max) + { + // Saturation so stop. + bucket_size = bucket_d.size(); // So at end bucket_size == 0. + break; + } + + if (dmap.element(p) < d) + // p has already been processed, having a distance less than d. + continue; + + for_all(q) + { + if (dmap.domain().has(q) && dmap(q) > d) + { + unsigned d_ = d + q.w(); + if (d_ < dmap(q)) + { + dmap(q) = d_; + functor.process_(dmap.element(p), q); // <- process + bucket[d_ % mod].push_back(q); + ++bucket_size; + } + } + } + bucket_size -= bucket_d.size(); + bucket_d.clear(); + } + + trace::exiting("canvas::impl::distance_front_fastest"); + return dmap; + } + } + + + } // of namespace mln::canvas::impl + + + + // Dispatch. + + namespace internal + { + + template <typename I, + typename N, typename W, typename D, + typename F> + inline + mln_ch_value(I, D) + distance_front_dispatch(metal::false_, + const Image<I>& input, + const Neighborhood<N>& nbh, const Weighted_Window<W>& w_win, + D max, F& functor) + { + return impl::generic::distance_front(input, nbh, max, w_win, functor); + } + + template <typename I, + typename N, typename W, typename D, + typename F> + inline + mln_ch_value(I, D) + distance_front_dispatch(metal::true_, + const Image<I>& input, + const Neighborhood<N>& nbh, const Weighted_Window<W>& w_win, + D max, F& functor) + { + return impl::distance_front_fastest(input, nbh, w_win, max, functor); +// return impl::generic::distance_front(input, nbh, w_win, max, functor); + } + + template <typename I, + typename N, typename W, typename D, + typename F> + inline + mln_ch_value(I, D) + distance_front_dispatch(const Image<I>& input, + const Neighborhood<N>& nbh, const Weighted_Window<W>& w_win, + D max, F& functor) + { + enum { + test = mlc_equal(mln_trait_image_speed(I), + trait::image::speed::fastest)::value + && + mln_is_simple_neighborhood(N)::value + }; + return distance_front_dispatch(metal::bool_<test>(), + input, nbh, w_win, max, functor); + } + + + } // of namespace mln::canvas::internal + + + + // Facade. + + template <typename I, + typename N, typename W, typename D, + typename F> + inline + mln_ch_value(I, D) + distance_front(const Image<I>& input, + const Neighborhood<N>& nbh, const Weighted_Window<W>& w_win, + D max, F& functor) + { + trace::entering("canvas::distance_front"); + + internal::distance_front_tests(input, nbh, w_win, max, functor); + + mln_ch_value(I,D) output; + output = internal::distance_front_dispatch(input, nbh, w_win, max, functor); + + trace::exiting("canvas::distance_front"); + return output; + } + + +# endif // ! MLN_INCLUDE_ONLY + + } // end of namespace mln::canvas + +} // end of namespace mln + + +#endif // ! MLN_CANVAS_DISTANCE_FRONT_HH