2 grob-pq-engraver.cc -- implement Grob_pq_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 2001--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
10 #include "engraver.hh"
21 operator< (Grob_pq_entry const &a, Grob_pq_entry const &b)
23 return a.end_ < b.end_;
26 class Grob_pq_engraver : public Engraver
29 TRANSLATOR_DECLARATIONS (Grob_pq_engraver);
31 virtual void initialize ();
32 DECLARE_ACKNOWLEDGER (grob);
33 void start_translation_timestep ();
34 void stop_translation_timestep ();
36 vector<Grob_pq_entry> started_now_;
39 Grob_pq_engraver::Grob_pq_engraver ()
44 Grob_pq_engraver::initialize ()
46 context ()->set_property ("busyGrobs", SCM_EOL);
49 LY_DEFINE (ly_grob_pq_less_p, "ly:grob-pq-less?",
50 2, 0, 0, (SCM a, SCM b),
51 "Compare 2 grob priority queue entries. Internal")
53 if (Moment::compare (*unsmob_moment (scm_car (a)),
54 *unsmob_moment (scm_car (b))) < 0)
61 Grob_pq_engraver::acknowledge_grob (Grob_info gi)
63 Stream_event *ev = gi.event_cause ();
66 && !gi.grob ()->internal_has_interface (ly_symbol2scm ("multi-measure-interface")))
68 Moment n = now_mom ();
69 Moment l = get_event_length (ev);
76 l.grace_part_ = l.main_part_;
86 started_now_.push_back (e);
91 Grob_pq_engraver::stop_translation_timestep ()
93 Moment now = now_mom ();
94 SCM start_busy = get_property ("busyGrobs");
95 SCM busy = start_busy;
96 while (scm_is_pair (busy) && *unsmob_moment (scm_caar (busy)) == now)
97 busy = scm_cdr (busy);
99 vector_sort (started_now_, less<Grob_pq_entry> ());
102 for (vsize i = 0; i < started_now_.size (); i++)
104 *tail = scm_acons (started_now_[i].end_.smobbed_copy (),
105 started_now_[i].grob_->self_scm (),
107 tail = SCM_CDRLOC (*tail);
110 busy = scm_merge_x (lst, busy, ly_grob_pq_less_p_proc);
111 context ()->set_property ("busyGrobs", busy);
113 started_now_.clear ();
117 Grob_pq_engraver::start_translation_timestep ()
119 Moment now = now_mom ();
121 SCM start_busy = get_property ("busyGrobs");
122 SCM busy = start_busy;
123 while (scm_is_pair (busy) && *unsmob_moment (scm_caar (busy)) < now)
126 The grob-pq-engraver is not water tight, and stuff like
127 tupletSpannerDuration confuses it.
129 busy = scm_cdr (busy);
132 if (start_busy != busy)
133 context ()->set_property ("busyGrobs", busy);
136 #include "translator.icc"
137 ADD_ACKNOWLEDGER (Grob_pq_engraver, grob);
138 ADD_TRANSLATOR (Grob_pq_engraver,
140 /* doc */ "Administrate when certain grobs (eg. note heads) stop playing",
142 /* read */ "busyGrobs",
143 /* write */ "busyGrobs");