Fixes for silence in projects, various cleanups.

[dcpomatic.git] / src / lib / dcpomatic_time_coalesce.h

diff --git a/src/lib/dcpomatic_time_coalesce.h b/src/lib/dcpomatic_time_coalesce.h
new file mode 100644 (file)
index 0000000..e103e80
--- /dev/null
+++ b/src/lib/dcpomatic_time_coalesce.h
@@ -0,0 +1,48 @@
+/*
+    Copyright (C) 2017 Carl Hetherington <cth@carlh.net>
+
+    This file is part of DCP-o-matic.
+
+    DCP-o-matic 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 2 of the License, or
+    (at your option) any later version.
+
+    DCP-o-matic 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 DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+#include "dcpomatic_time.h"
+#include <iostream>
+
+/** @param periods Set of periods in ascending order of from time */
+template <class T>
+std::list<TimePeriod<T> > coalesce (std::list<TimePeriod<T> > periods)
+{
+       bool did_something;
+       std::list<TimePeriod<T> > coalesced;
+       do {
+               coalesced.clear ();
+               did_something = false;
+               for (typename std::list<TimePeriod<T> >::const_iterator i = periods.begin(); i != periods.end(); ++i) {
+                       typename std::list<TimePeriod<T> >::const_iterator j = i;
+                       ++j;
+                       if (j != periods.end() && (i->overlap(*j) || i->to == j->from)) {
+                               coalesced.push_back (TimePeriod<T> (i->from, j->to));
+                               did_something = true;
+                               ++i;
+                       } else {
+                               coalesced.push_back (*i);
+                       }
+               }
+               periods = coalesced;
+       } while (did_something);
+
+       return periods;
+}