Release: bump Welcome versions.

[lilypond.git] / lily / key-performer.cc

diff --git a/lily/key-performer.cc b/lily/key-performer.cc
index bca4c5c106e8fd59f48e914a7b17ce632a76b82a..5de378eda49832c11a8366d155044b23373912ac 100644 (file)
--- a/lily/key-performer.cc
+++ b/lily/key-performer.cc
@@ -1,58 +1,127 @@
 /*
-  key-performer.cc -- implement Key_performer
+  This file is part of LilyPond, the GNU music typesetter.
 
-  source file of the GNU LilyPond music typesetter
+  Copyright (C) 1997--2015 Jan Nieuwenhuizen <janneke@gnu.org>
 
-  (c) 1997 Jan Nieuwenhuizen <jan@digicash.com>
+  LilyPond is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  LilyPond is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-#include "key-performer.hh"
-#include "command-request.hh"
 #include "audio-item.hh"
+#include "music-sequence.hh"
+#include "performer.hh"
+#include "stream-event.hh"
+#include "warn.hh"
+#include "lily-imports.hh"
+
+#include "translator.icc"
+
+class Key_performer : public Performer
+{
+public:
+  TRANSLATOR_DECLARATIONS (Key_performer);
+  ~Key_performer ();
 
+protected:
+  void process_music ();
+  void stop_translation_timestep ();
 
+  void listen_key_change (Stream_event *);
+private:
+  Stream_event *key_ev_;
+  Audio_key *audio_;
+};
 
-IMPLEMENT_IS_TYPE_B1(Key_performer,Performer);
-ADD_THIS_TRANSLATOR(Key_performer);
+Key_performer::Key_performer (Context *c)
+  : Performer (c)
+{
+  key_ev_ = 0;
+  audio_ = 0;
+}
 
-Key_performer::Key_performer()
+Key_performer::~Key_performer ()
 {
-  key_req_l_ = 0;
 }
 
-Key_performer::~Key_performer()
+void
+Key_performer::process_music ()
 {
+  if (key_ev_)
+    {
+      SCM pitchlist = key_ev_->get_property ("pitch-alist");
+
+      SCM acc = Lily::alterations_in_key (pitchlist);
+
+      Pitch key_do (0,
+                    scm_to_int (scm_caar (pitchlist)),
+                    ly_scm2rational (scm_cdar (pitchlist)));
+
+      Pitch c_do;
+
+      SCM c_pitchlist
+        = ly_transpose_key_alist (pitchlist,
+                                  pitch_interval (key_do, c_do).smobbed_copy ());
+
+      /* MIDI keys are too limited for lilypond scales.
+         We check for minor scale and assume major otherwise.  */
+
+      SCM third = scm_assoc (scm_from_int (2),
+                             c_pitchlist);
+      bool minor = (scm_is_pair (third)
+                    && scm_is_number (scm_cdr (third))
+                    && ly_scm2rational (scm_cdr (third)) == FLAT_ALTERATION);
+
+      audio_ = new Audio_key (scm_to_int (acc),
+                              !minor);
+
+      Audio_element_info info (audio_, key_ev_);
+      announce_element (info);
+      key_ev_ = 0;
+    }
 }
 
-void 
-Key_performer::do_print() const
+void
+Key_performer::stop_translation_timestep ()
 {
-#ifndef NPRINT
-  if (key_req_l_)
-       key_req_l_->print();
-#endif
+  if (audio_)
+    {
+      audio_ = 0;
+    }
 }
 
 void
-Key_performer::do_process_requests()
+Key_performer::listen_key_change (Stream_event *ev)
 {
-  if (key_req_l_)
-       play (new Audio_key (key_req_l_));
-  key_req_l_ = 0;
+  if (!key_ev_)
+    key_ev_ = ev;
 }
 
-bool
-Key_performer::do_try_request (Request* req_l)
+void
+Key_performer::boot ()
 {
-  if (key_req_l_)
-       return false;
+  ADD_LISTENER (Key_performer, key_change);
+}
 
-  if (req_l->command())
-       key_req_l_ = req_l->command()->keychange ();
+ADD_TRANSLATOR (Key_performer,
+                /* doc */
+                "",
 
-  if (key_req_l_)
-       return true;
+                /* create */
+                "",
 
-  return false;
-}
+                /* read */
+                "",
 
+                /* write */
+                ""
+               );