2 This file is part of LilyPond, the GNU music typesetter.
4 Copyright (C) 1997--2014 Han-Wen Nienhuys <hanwen@xs4all.nl>
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.
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.
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/>.
20 #include "engraver-group.hh"
23 #include "international.hh"
25 #include "time-signature.hh"
29 generate time_signatures.
31 class Time_signature_engraver : public Engraver
33 Item *time_signature_;
34 SCM last_time_fraction_;
37 virtual void derived_mark () const;
38 void stop_translation_timestep ();
39 void process_music ();
41 TRANSLATOR_DECLARATIONS (Time_signature_engraver);
45 Time_signature_engraver::derived_mark () const
47 scm_gc_mark (last_time_fraction_);
50 Time_signature_engraver::Time_signature_engraver ()
53 last_time_fraction_ = SCM_BOOL_F;
57 Time_signature_engraver::process_music ()
60 not rigorously safe, since the value might get GC'd and
61 reallocated in the same spot */
62 SCM fr = get_property ("timeSignatureFraction");
64 && last_time_fraction_ != fr
67 int den = scm_to_int (scm_cdr (fr));
68 if (den != (1 << intlog2 (den)))
71 Todo: should make typecheck?
73 OTOH, Tristan Keuris writes 8/20 in his Intermezzi.
75 warning (_f ("strange time signature found: %d/%d",
76 int (scm_to_int (scm_car (fr))),
80 time_signature_ = make_item ("TimeSignature", SCM_EOL);
81 time_signature_->set_property ("fraction", fr);
83 if (last_time_fraction_ == SCM_BOOL_F)
84 time_signature_->set_property ("break-visibility",
85 get_property ("implicitTimeSignatureVisibility"));
87 last_time_fraction_ = fr;
92 Time_signature_engraver::stop_translation_timestep ()
97 #include "translator.icc"
99 ADD_TRANSLATOR (Time_signature_engraver,
101 "Create a @ref{TimeSignature} whenever"
102 " @code{timeSignatureFraction} changes.",
108 "implicitTimeSignatureVisibility "
109 "timeSignatureFraction ",