/*
This file is part of LilyPond, the GNU music typesetter.
- Copyright (C) 1999--2012 Han-Wen Nienhuys <hanwen@xs4all.nl>
+ Copyright (C) 1999--2015 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
#include "context.hh"
#include "beaming-pattern.hh"
+#include "misc.hh"
/*
Represents a stem belonging to a beam. Sometimes (for example, if the stem
tuplet_start_ = false;
}
-Beam_rhythmic_element::Beam_rhythmic_element (Moment m, int i, bool inv,
- Rational factor, bool tuplet_start)
+Beam_rhythmic_element::Beam_rhythmic_element (Moment m, int i, bool inv,
+ Rational factor, bool tuplet_start)
{
start_moment_ = m;
rhythmic_importance_ = 0;
for (int i = 0; i < 2; i++)
for (vsize i = 1; i < infos_.size () - 1; i++)
{
- Direction non_flag_dir = other_dir (flag_directions[i]);
+ Direction non_flag_dir = -flag_directions[i];
if (non_flag_dir)
{
- int importance = infos_[i + 1].rhythmic_importance_;
- int count = (importance < 0 && options.subdivide_beams_)
- ? 1 : min (min (infos_[i].count (non_flag_dir),
- infos_[i + non_flag_dir].count (-non_flag_dir)),
- infos_[i - non_flag_dir].count (non_flag_dir));
+ int count =
+ (infos_[i + 1].rhythmic_importance_ < 0 &&
+ options.subdivide_beams_)
+ // we're left of a subdivision
+ ? (i != infos_.size () - 2)
+ // respect the beam count for shortened beams ...
+ ? max (beam_count_for_rhythmic_position (i + 1),
+ beam_count_for_length (remaining_length (i + 1)))
+ // ... except if there's only one trailing stem
+ : beam_count_for_rhythmic_position (i + 1)
+
+ // we're at any other stem
+ : min (min (infos_[i].count (non_flag_dir),
+ infos_[i + non_flag_dir].count (-non_flag_dir)),
+ infos_[i - non_flag_dir].count (non_flag_dir));
+
+ // Ensure at least one beam is left, even for groups longer than 1/8
+ count = max (count, 1);
infos_[i].beam_count_drul_[non_flag_dir] = count;
}
*tuplet_start_moment = Moment (-1, 1);
}
-
/*
Get the group start position, the next group starting position, and the
next beat starting position, given start_moment, base_moment,
while (*next_group_pos < *next_beat_pos)
{
- int group_count = 1; //default -- 1 base moments in a beam
+ I64 group_count = 1; //default -- 1 base moments in a beam
if (scm_is_pair (grouping))
{
group_count = scm_to_int (scm_car (grouping));
// If we have a tuplet, the count should be determined from
// the maximum tuplet size for beamed tuplets.
- int tuplet_number = factor.den ();
- if (tuplet_number > 1)
+ U64 tuplet_number = factor.den ();
+ if (tuplet_number > 1U)
{
// We use 1/8 as the base moment for the tuplet because it's
// the largest beamed value. If the tuplet is shorter, it's
// OK, the code still works
- int test_count = ( Moment (Rational (1, 8) / factor ) / base_moment).num ();
+ I64 test_count = ( Moment (Rational (1, 8) / factor) / base_moment).num ();
if (test_count > group_count) group_count = test_count;
}
*group_pos = *next_group_pos;
- *next_group_pos = *group_pos + group_count * base_moment;
+ *next_group_pos = *group_pos + Rational(group_count) * base_moment;
}
}
Moment next_group_pos (0);
Moment next_beat_pos (options.base_moment_);
Moment tuplet_start_moment (-1, 1);
- int tuplet_number = 1;
+ I64 tuplet_number = 1;
SCM grouping = options.grouping_;
vsize i = 0;
Moment tuplet_moment (tuplet);
Moment tuplet_dt = infos_[i].start_moment_ - tuplet_start_moment;
tuplet_number = tuplet.den ();
- // set the beat end (if not in a tuplet) and increment the next beat
+ // set the beat end and increment the next beat
if (infos_[i].start_moment_ == next_beat_pos)
{
- if (tuplet_number == 1)
- {
- infos_[i].rhythmic_importance_ = -1;
- next_beat_pos += options.base_moment_;
- }
- if (infos_[i].tuplet_start_)
- infos_[i].rhythmic_importance_ = -1;
+ infos_[i].rhythmic_importance_ = -1;
+ next_beat_pos += options.base_moment_;
}
// The rhythmic importance of a stem between beats depends on its fraction
// of a beat: those stems with a lower denominator are deemed more
// the fraction of the tuplet, instead of the fraction of
// a beat.
Moment ratio = (tuplet_number == 1)
- ? dt / options.base_moment_
- : tuplet_dt / Moment (1, 8) / tuplet_moment;
+ ? dt / options.base_moment_
+ : tuplet_dt / Moment (1, 8) / tuplet_moment;
if (infos_[i].rhythmic_importance_ >= 0)
infos_[i].rhythmic_importance_ = (int) ratio.den ();
Moment
Beaming_pattern::end_moment (int i) const
{
- Duration *dur = new Duration (2 + max (beamlet_count (i, LEFT),
- beamlet_count (i, RIGHT)),
- 0);
+ Duration dur (2 + max (beamlet_count (i, LEFT),
+ beamlet_count (i, RIGHT)),
+ 0);
+
+ return infos_.at (i).start_moment_
+ + infos_.at (i).factor_ * dur.get_length ();
+}
+
+Moment
+Beaming_pattern::remaining_length (int i) const
+{
+ return end_moment (infos_.size () - 1) - infos_[i].start_moment_;
+}
- return infos_.at (i).start_moment_ + dur->get_length ();
+int
+Beaming_pattern::beam_count_for_rhythmic_position (int idx) const
+{
+ // Calculate number of beams representing the rhythmic position of given stem
+ return intlog2(infos_[idx].start_moment_.main_part_.den()) - 2;
+}
+
+int
+Beaming_pattern::beam_count_for_length (Moment len) const
+{
+ return intlog2(len.main_part_.den()) - 2 - intlog2(len.main_part_.num());
}
bool
projects / lilypond.git / blobdiff