Gets vertical skylines from grob stencils

lily/text-interface.cc

 /*
   This file is part of LilyPond, the GNU music typesetter.
 
   Copyright (C) 1998--2012 Han-Wen Nienhuys <hanwen@xs4all.nl>
   Jan Nieuwenhuizen <janneke@gnu.org>
 
   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 "text-interface.hh"
-
+#include "skyline-pair.hh"
+
+#include "lookup.hh"
 #include "config.hh"
 #include "font-interface.hh"
 #include "grob.hh"
 #include "main.hh"
 #include "misc.hh"
 #include "modified-font-metric.hh"
 #include "output-def.hh"
 #include "pango-font.hh"
 #include "program-option.hh"
 #include "international.hh"
@@ skipping 166 matching lines @@
                " @code{ly:text-interface::interpret-markup}.",
 
                /* properties */
                "baseline-skip "
                "replacement-alist "
                "text "
                "word-space "
                "text-direction "
               );