lily/grace-music.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1999--2010 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5
   6   LilyPond is free software: you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation, either version 3 of the License, or
   9   (at your option) any later version.
  10
  11   LilyPond is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14   GNU General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "music.hh"
  21 #include "music-wrapper.hh"
  22
  23 class Grace_music
  24 {
  25 public:
  26   DECLARE_SCHEME_CALLBACK (start_callback, (SCM));
  27 };
  28
  29 MAKE_SCHEME_CALLBACK (Grace_music, start_callback, 1);
  30 SCM
  31 Grace_music::start_callback (SCM m)
  32 {
  33   Moment *l = unsmob_moment (Music_wrapper::length_callback (m));
  34   Moment gl;
  35   gl.grace_part_ = -(l->main_part_ + l->grace_part_);
  36   return gl.smobbed_copy ();
  37 }