Caches the interior skylines of vertical axis groups and systems.

lily/directional-element-interface.cc

 /*
   This file is part of LilyPond, the GNU music typesetter.
 
   Copyright (C) 1999--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/>.
 */
 
 #include "directional-element-interface.hh"
 #include "warn.hh"
 #include "grob.hh"
 
 Direction
+recursive_get_grob_direction (Grob *me)
+{
+  Direction d = get_grob_direction (me);
+  if (d == CENTER)
+    {
+      Grob *yp = me->get_parent (Y_AXIS);
+      if (yp)
+        return recursive_get_grob_direction (yp);
+    }
+
+  return d;
+}
+
+Direction
 get_grob_direction (Grob *me)
 {
   SCM d = me->get_property ("direction");
   if (d == ly_symbol2scm ("calculation-in-progress"))
     {
       programming_error ("Grob direction requested while calculation in"
                          " progress.");
       return UP;
     }
   if (!is_direction (d))
     return CENTER;
 
   return to_dir (d);
 }
 
 void
 set_grob_direction (Grob *me, Direction d)
 {
   SCM sd = scm_from_int (d);
   me->set_property ("direction", sd);
 }