lily/grob-pq-engraver.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2001--2011  Han-Wen Nienhuys <hanwen@xs4all.nl>
   5
   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.
  10
  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.
  15
  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/>.
  18 */
  19
  20 #include "context.hh"
  21 #include "engraver.hh"
  22 #include "grob.hh"
  23 #include "warn.hh"
  24
  25 struct Grob_pq_entry
  26 {
  27   Grob *grob_;
  28   Moment end_;
  29 };
  30
  31 bool
  32 operator< (Grob_pq_entry const &a, Grob_pq_entry const &b)
  33 {
  34   return a.end_ < b.end_;
  35 }
  36
  37 class Grob_pq_engraver : public Engraver
  38 {
  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 ();
  47
  48   vector<Grob_pq_entry> started_now_;
  49 };
  50
  51 Grob_pq_engraver::Grob_pq_engraver ()
  52 {
  53 }
  54
  55 void
  56 Grob_pq_engraver::initialize ()
  57 {
  58   context ()->set_property ("busyGrobs", SCM_EOL);
  59 }
  60
  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.")
  65 {
  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;
  71 }
  72
  73 void
  74 Grob_pq_engraver::acknowledge_grob (Grob_info gi)
  75 {
  76   Stream_event *ev = gi.event_cause ();
  77
  78   if (ev
  79       && !gi.grob ()->internal_has_interface (ly_symbol2scm ("multi-measure-interface")))
  80     {
  81       Moment n = now_mom ();
  82       Moment l = get_event_length (ev, n);
  83
  84       if (!l.to_bool ())
  85         return;
  86
  87       Moment end = n + l;
  88
  89       Grob_pq_entry e;
  90       e.grob_ = gi.grob ();
  91       e.end_ = end;
  92
  93       started_now_.push_back (e);
  94     }
  95 }
  96
  97 void
  98 Grob_pq_engraver::process_acknowledged ()
  99 {
 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++)
 104     {
 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);
 109     }
 110
 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);
 114
 115   started_now_.clear ();
 116 }
 117
 118 void
 119 Grob_pq_engraver::stop_translation_timestep ()
 120 {
 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);
 126
 127 }
 128
 129 void
 130 Grob_pq_engraver::start_translation_timestep ()
 131 {
 132   Moment now = now_mom ();
 133
 134   SCM start_busy = get_property ("busyGrobs");
 135   SCM busy = start_busy;
 136   while (scm_is_pair (busy) && *unsmob_moment (scm_caar (busy)) < now)
 137     {
 138       /*
 139         The grob-pq-engraver is not water tight, and stuff like
 140         tupletSpannerDuration confuses it.
 141       */
 142       busy = scm_cdr (busy);
 143     }
 144
 145   if (start_busy != busy)
 146     context ()->set_property ("busyGrobs", busy);
 147 }
 148
 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.",
 155
 156                 /* create */
 157                 "",
 158
 159                 /* read */
 160                 "busyGrobs ",
 161
 162                 /* write */
 163                 "busyGrobs "
 164                 );