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[lilypond.git] / lily / completion-note-heads-engraver.cc

diff --git a/lily/completion-note-heads-engraver.cc b/lily/completion-note-heads-engraver.cc
index ab25e271c03771f6a9e26af72c39eb4bd9f55d77..e0b57b8248395b8e755f3357a95f63d8f0896d92 100644 (file)
--- a/lily/completion-note-heads-engraver.cc
+++ b/lily/completion-note-heads-engraver.cc
@@ -1,7 +1,7 @@
 /*
   This file is part of LilyPond, the GNU music typesetter.
 
-  Copyright (C) 1997--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
+  Copyright (C) 1997--2012 Han-Wen Nienhuys <hanwen@xs4all.nl>
 
   LilyPond is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -35,6 +35,7 @@ using namespace std;
 #include "tie.hh"
 #include "tie-column.hh"
 #include "warn.hh"
+#include "misc.hh"
 
 #include "translator.icc"
 
@@ -47,7 +48,7 @@ using namespace std;
   Every time process_music () is called and there are note events, we
   figure out how long the note to typeset should be. It should be no
   longer than what's specified, than what is left to do and it should
-  not cross barlines.
+  not cross barlines or sub-bar units.
 
   We copy the events into scratch note events, to make sure that we get
   all durations exactly right.
@@ -69,7 +70,7 @@ class Completion_heads_engraver : public Engraver
   Rational do_nothing_until_;
   Rational factor_;
 
-  Moment next_barline_moment ();
+  Moment next_moment (Rational const &);
   Item *make_note_head (Stream_event *);
 
 public:
@@ -105,10 +106,10 @@ Completion_heads_engraver::listen_note (Stream_event *ev)
 }
 
 /*
-  The duration _until_ the next bar line.
+  The duration _until_ the next bar line or completion unit
 */
 Moment
-Completion_heads_engraver::next_barline_moment ()
+Completion_heads_engraver::next_moment (Rational const &note_len)
 {
   Moment *e = unsmob_moment (get_property ("measurePosition"));
   Moment *l = unsmob_moment (get_property ("measureLength"));
@@ -117,7 +118,40 @@ Completion_heads_engraver::next_barline_moment ()
       return Moment (0, 0);
     }
 
-  return (*l - *e);
+  Moment result = *l - *e;
+  Moment const *unit = unsmob_moment (get_property ("completionUnit"));
+
+  if (unit)
+    {
+      Rational const now_unit = e->main_part_ / unit->main_part_;
+      if (now_unit.den () > 1)
+        {
+          /*
+            within a unit - go to the end of that
+          */
+          result = unit->main_part_
+                   * (Rational (1) - (now_unit - now_unit.trunc_rat ()));
+        }
+      else
+        {
+          /*
+            at the beginning of a unit:
+            take a power-of-two number of units, but not more than required,
+            since then the Duration constructor destroys the unit structure
+          */
+          if (note_len < result.main_part_)
+            result.main_part_ = note_len;
+          Rational const step_unit = result.main_part_ / unit->main_part_;
+          if (step_unit.den () < step_unit.num ())
+            {
+              int const log2
+                = intlog2 (int (step_unit.num () / step_unit.den ()));
+              result.main_part_ = unit->main_part_ * Rational (1 << log2);
+            }
+        }
+    }
+
+  return result;
 }
 
 Item *
@@ -168,10 +202,10 @@ Completion_heads_engraver::process_music ()
       factor_ = note_dur.factor ();
       left_to_do_ = orig->get_length ();
     }
-  Moment nb = next_barline_moment ();
+  Moment nb = next_moment (note_dur.get_length ());
   if (nb.main_part_ && nb < note_dur.get_length ())
     {
-      if (factor_.denominator () == 1 && factor_ > Rational (1, 1))
+      if (factor_.denominator () == 1 && factor_.numerator () > 1)
         note_dur = Duration (nb.main_part_, false);
       else
         note_dur = Duration (nb.main_part_ / factor_, false).compressed (factor_);