Approximates cross-staff slurs in VerticalAxisGroup vertical-skylines.

lily/include/slur.hh

 /*
   This file is part of LilyPond, the GNU music typesetter.
 
   Copyright (C) 2004--2012 Han-Wen Nienhuys <hanwen@xs4all.nl>
 
   LilyPond 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, either version 3 of the License, or
   (at your option) any later version.
 
   LilyPond 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 LilyPond.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #ifndef SLUR_HH
 #define SLUR_HH
 
 #include "lily-proto.hh"
 #include "std-vector.hh"
 #include "grob-interface.hh"
 
+struct Slur_info
+{
+  Slur_info (Grob *slur);
+  Grob *slur_;
+  vector<Grob *> stubs_;
+};
+
 class Slur
 {
 public:
   static void add_column (Grob *me, Grob *col);
   static void add_extra_encompass (Grob *me, Grob *col);
   static void main_to_stub (Grob *main, Grob *stub);
   static void replace_breakable_encompass_objects (Grob *me);
-  static void auxiliary_acknowledge_extra_object (Grob_info const &, vector<Grob *> &, vector<Grob *> &);
+  static void auxiliary_acknowledge_extra_object (Grob_info const &, vector<Slur_info> &, vector<Slur_info> &);
   DECLARE_SCHEME_CALLBACK (print, (SCM));
   DECLARE_SCHEME_CALLBACK (calc_control_points, (SCM));
   DECLARE_SCHEME_CALLBACK (calc_direction, (SCM));
-  DECLARE_SCHEME_CALLBACK (direction_from_shadowed_slur, (SCM));
   DECLARE_SCHEME_CALLBACK (pure_height, (SCM, SCM, SCM));
   DECLARE_SCHEME_CALLBACK (height, (SCM));
+  DECLARE_SCHEME_CALLBACK (extremal_stub_vertical_skylines, (SCM));
   DECLARE_SCHEME_CALLBACK (vertical_skylines, (SCM));
   DECLARE_SCHEME_CALLBACK (outside_slur_callback, (SCM, SCM));
   DECLARE_SCHEME_CALLBACK (pure_outside_slur_callback, (SCM, SCM, SCM, SCM));
   DECLARE_SCHEME_CALLBACK (outside_slur_cross_staff, (SCM, SCM));
   DECLARE_SCHEME_CALLBACK (calc_cross_staff, (SCM));
   DECLARE_GROB_INTERFACE ();
   static Bezier get_curve (Grob *me);
 };
 
 #endif /* SLUR_HH */