lily/relative-octave-check.cc

   1 /*
   2   relative-octave-check.cc -- implement Relative_octave_check
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2005--2008 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #include "input.hh"
  10 #include "international.hh"
  11 #include "music.hh"
  12
  13 class Relative_octave_check
  14 {
  15 public:
  16   DECLARE_SCHEME_CALLBACK (relative_callback, (SCM, SCM));
  17 };
  18
  19 MAKE_SCHEME_CALLBACK (Relative_octave_check, relative_callback, 2)
  20   SCM
  21 Relative_octave_check::relative_callback (SCM music, SCM last_pitch)
  22 {
  23   Pitch p = *unsmob_pitch (last_pitch);
  24   Music *m = unsmob_music (music);
  25   Pitch *check_p = unsmob_pitch (m->get_property ("pitch"));
  26
  27   int delta_oct = 0;
  28   if (check_p)
  29     {
  30       Pitch no_octave (-1,
  31                        check_p->get_notename (),
  32                        check_p->get_alteration ());
  33
  34       Pitch result = no_octave.to_relative_octave (p);
  35
  36       if (result != *check_p)
  37         {
  38           string s = _ ("Failed octave check, got: ");
  39           s += result.to_string ();
  40
  41           m->origin ()->warning (s);
  42
  43           delta_oct = check_p->get_octave () - result.get_octave ();
  44         }
  45     }
  46
  47   return Pitch (p.get_octave () + delta_oct,
  48                 p.get_notename (),
  49                 p.get_alteration ()).smobbed_copy ();
  50 }