Made tupletSpannerDuration work again.

[lilypond.git] / lily / time-scaled-music-iterator.cc

diff --git a/lily/time-scaled-music-iterator.cc b/lily/time-scaled-music-iterator.cc
index 7406d884697f6508e9e09a231dbfea7b50917e35..d07c979e3b3c2628ed7f5001b5b1a1da90d93317 100644 (file)
--- a/lily/time-scaled-music-iterator.cc
+++ b/lily/time-scaled-music-iterator.cc
@@ -7,40 +7,131 @@
                  Erik Sandberg <mandolaerik@gmail.com>
 */
 
-#include "time-scaled-music-iterator.hh"
-
 #include "context.hh"
 #include "input.hh"
 #include "international.hh"
 #include "music.hh"
+#include "sequential-iterator.hh"
+
+/*
+  Iterates \times, by sending TupletEvents at the start/end of each
+  tuplet bracket. Extra stop/start events are sent at regular
+  intervals if tupletSpannerDuration is set.
+*/
+class Time_scaled_music_iterator : public Sequential_iterator
+{
+public:
+  DECLARE_SCHEME_CALLBACK (constructor, ());
+  /* construction */
+  DECLARE_CLASSNAME(Time_scaled_music_iterator);
+  Time_scaled_music_iterator ();
+protected:
+  virtual SCM get_music_list () const;
+  virtual void process (Moment m);
+  virtual void construct_children ();
+  virtual void derived_mark () const;
+  virtual Moment pending_moment () const;
+private:
+  /* tupletSpannerDuration */
+  Moment spanner_duration_;
+  /* next time to add a stop/start pair */
+  Moment next_split_mom_;
+  /* Recycle start/stop events if tupletSpannerDuration is set. */
+  Music *start_;
+  Music *stop_;
+};
 
 Time_scaled_music_iterator::Time_scaled_music_iterator ()
 {
+  spanner_duration_ = next_split_mom_ = 0;
 }
 
-SCM
-Time_scaled_music_iterator::get_music_list () const
+
+Moment
+Time_scaled_music_iterator::pending_moment () const
+{
+  Moment next_mom = Sequential_iterator::pending_moment ();
+
+  if (spanner_duration_.to_bool () &&
+      next_mom.main_part_ > next_split_mom_)
+    {
+      next_mom = next_split_mom_;
+    }
+
+  return next_mom;
+}
+
+
+void
+Time_scaled_music_iterator::process (Moment m)
+{
+  if (spanner_duration_.to_bool () &&
+      m.main_part_ == next_split_mom_)
+    {
+      report_event (stop_);
+      report_event (start_);
+      next_split_mom_ += spanner_duration_;
+      /* avoid sending events twice at the end */
+      if (next_split_mom_ == get_music ()->get_length ().main_part_)
+       next_split_mom_.set_infinite (1);
+    }
+  Sequential_iterator::process(m);
+}
+
+void
+Time_scaled_music_iterator::construct_children ()
 {
+  /*
+    Inheritance trickery:
+    Time_scaled_music_iterator::construct_children initialises start_
+    and stop_, and calls Sequential_music::construct_children, which
+    in turn calls Time_scaled_music_iterator::get_music which reads
+    start_ and stop_.
+   */
+
   Music *mus = get_music ();
   Input *origin = mus->origin ();
-  Music *child = unsmob_music (mus->get_property ("element"));
 
-  /* Create tuplet start/stop span events before/after the music */
   SCM tuplet_symbol = ly_symbol2scm ("TupletEvent");
-  SCM start_event = scm_call_2 (ly_lily_module_constant ("make-span-event"), tuplet_symbol, scm_from_int (START));
-  Music *start = unsmob_music (start_event);
-  start->set_spot (*origin);
-  start->set_property ("numerator", mus->get_property ("numerator"));
-  start->set_property ("denominator", mus->get_property ("denominator"));
-  start_event = scm_call_1 (ly_lily_module_constant ("make-event-chord"), scm_list_1 (start_event));
-  unsmob_music (start_event)->set_spot (*origin);
-
-  SCM stop_event = scm_call_2 (ly_lily_module_constant ("make-span-event"), tuplet_symbol, scm_from_int (STOP));
-  unsmob_music (stop_event)->set_spot (*origin);
-  stop_event = scm_call_1 (ly_lily_module_constant ("make-event-chord"), scm_list_1 (stop_event));
-  unsmob_music (stop_event)->set_spot (*origin);
-
-  return scm_list_3 (start_event, child->self_scm (), stop_event);
+  SCM start_scm = scm_call_2 (ly_lily_module_constant ("make-span-event"), tuplet_symbol, scm_from_int (START));
+  start_ = unsmob_music (start_scm);
+  start_->set_spot (*origin);
+  start_->set_property ("numerator", mus->get_property ("numerator"));
+  start_->set_property ("denominator", mus->get_property ("denominator"));
+
+  SCM stop_scm = scm_call_2 (ly_lily_module_constant ("make-span-event"), tuplet_symbol, scm_from_int (STOP));
+  stop_ = unsmob_music (stop_scm);
+  stop_->set_spot (*origin);
+
+  Moment *mp = unsmob_moment (get_outlet ()->get_property ("tupletSpannerDuration"));
+
+  if (mp)
+    {
+      spanner_duration_ = mp->main_part_;
+      next_split_mom_ = spanner_duration_;
+    }
+
+  Sequential_iterator::construct_children ();
+}
+
+SCM
+Time_scaled_music_iterator::get_music_list () const
+{
+  Music *mus = get_music ();
+  SCM child = mus->get_property ("element");
+
+  return scm_list_3 (start_->self_scm (), child, stop_->self_scm ());
+}
+
+void
+Time_scaled_music_iterator::derived_mark () const
+{
+  if (start_)
+    scm_gc_mark (start_->self_scm ());
+  if (stop_)
+    scm_gc_mark (stop_->self_scm ());
+
+  Sequential_iterator::derived_mark ();
 }
 
 IMPLEMENT_CTOR_CALLBACK (Time_scaled_music_iterator);