Release: update news.
[lilypond/patrick.git] / lily / grob-pq-engraver.cc
blob57ba04f9c946c8a9cd0760cb794889b8aba11273
1 /*
2 This file is part of LilyPond, the GNU music typesetter.
4 Copyright (C) 2001--2011 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 "context.hh"
21 #include "engraver.hh"
22 #include "grob.hh"
23 #include "warn.hh"
25 struct Grob_pq_entry
27 Grob *grob_;
28 Moment end_;
31 bool
32 operator< (Grob_pq_entry const &a, Grob_pq_entry const &b)
34 return a.end_ < b.end_;
37 class Grob_pq_engraver : public Engraver
39 public:
40 TRANSLATOR_DECLARATIONS (Grob_pq_engraver);
41 protected:
42 virtual void initialize ();
43 DECLARE_ACKNOWLEDGER (grob);
44 void start_translation_timestep ();
45 void stop_translation_timestep ();
46 void process_acknowledged ();
48 vector<Grob_pq_entry> started_now_;
51 Grob_pq_engraver::Grob_pq_engraver ()
55 void
56 Grob_pq_engraver::initialize ()
58 context ()->set_property ("busyGrobs", SCM_EOL);
61 LY_DEFINE (ly_grob_pq_less_p, "ly:grob-pq<?",
62 2, 0, 0, (SCM a, SCM b),
63 "Compare two grob priority queue entries."
64 " This is an internal function.")
66 if (Moment::compare (*unsmob_moment (scm_car (a)),
67 *unsmob_moment (scm_car (b))) < 0)
68 return SCM_BOOL_T;
69 else
70 return SCM_BOOL_F;
73 void
74 Grob_pq_engraver::acknowledge_grob (Grob_info gi)
76 Stream_event *ev = gi.event_cause ();
78 if (ev
79 && !gi.grob ()->internal_has_interface (ly_symbol2scm ("multi-measure-interface")))
81 Moment n = now_mom ();
82 Moment l = get_event_length (ev, n);
84 if (!l.to_bool ())
85 return;
87 Moment end = n + l;
89 Grob_pq_entry e;
90 e.grob_ = gi.grob ();
91 e.end_ = end;
93 started_now_.push_back (e);
97 void
98 Grob_pq_engraver::process_acknowledged ()
100 vector_sort (started_now_, less<Grob_pq_entry> ());
101 SCM lst = SCM_EOL;
102 SCM *tail = &lst;
103 for (vsize i = 0; i < started_now_.size (); i++)
105 *tail = scm_acons (started_now_[i].end_.smobbed_copy (),
106 started_now_[i].grob_->self_scm (),
107 SCM_EOL);
108 tail = SCM_CDRLOC (*tail);
111 SCM busy = get_property ("busyGrobs");
112 busy = scm_merge_x (lst, busy, ly_grob_pq_less_p_proc);
113 context ()->set_property ("busyGrobs", busy);
115 started_now_.clear ();
118 void
119 Grob_pq_engraver::stop_translation_timestep ()
121 Moment now = now_mom ();
122 SCM start_busy = get_property ("busyGrobs");
123 SCM busy = start_busy;
124 while (scm_is_pair (busy) && *unsmob_moment (scm_caar (busy)) == now)
125 busy = scm_cdr (busy);
129 void
130 Grob_pq_engraver::start_translation_timestep ()
132 Moment now = now_mom ();
134 SCM start_busy = get_property ("busyGrobs");
135 SCM busy = start_busy;
136 while (scm_is_pair (busy) && *unsmob_moment (scm_caar (busy)) < now)
139 The grob-pq-engraver is not water tight, and stuff like
140 tupletSpannerDuration confuses it.
142 busy = scm_cdr (busy);
145 if (start_busy != busy)
146 context ()->set_property ("busyGrobs", busy);
149 #include "translator.icc"
150 ADD_ACKNOWLEDGER (Grob_pq_engraver, grob);
151 ADD_TRANSLATOR (Grob_pq_engraver,
152 /* doc */
153 "Administrate when certain grobs (e.g., note heads) stop"
154 " playing.",
156 /* create */
159 /* read */
160 "busyGrobs ",
162 /* write */
163 "busyGrobs "