lily/grace-music.cc

   1 /*
   2   grace-music.cc -- implement Grace_music
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1999--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #include "music.hh"
  10 #include "music-wrapper.hh"
  11
  12 class Grace_music
  13 {
  14 public:
  15   DECLARE_SCHEME_CALLBACK (start_callback, (SCM));
  16 };
  17
  18 MAKE_SCHEME_CALLBACK (Grace_music, start_callback, 1);
  19 SCM
  20 Grace_music::start_callback (SCM m)
  21 {
  22   Moment *l = unsmob_moment (Music_wrapper::length_callback (m));
  23   Moment gl;
  24   gl.grace_part_ = -(l->main_part_ + l->grace_part_);
  25   return gl.smobbed_copy ();
  26 }