From: Carl Hetherington <cth@carlh.net>
Date: Mon, 16 May 2022 19:37:53 +0000 (+0200)
Subject: Add overlap() for lists of time periods.
X-Git-Url: https://git.carlh.net/gitweb/?p=dcpomatic.git;a=commitdiff_plain;h=eaee1cd5601a93037bc2fb0956b99b12fe1f90e6

Add overlap() for lists of time periods.
---

diff --git a/src/lib/dcpomatic_time_overlap.h b/src/lib/dcpomatic_time_overlap.h
new file mode 100644
index 000000000..dabeb98f3
--- /dev/null
+++ b/src/lib/dcpomatic_time_overlap.h
@@ -0,0 +1,47 @@
+/*
+    Copyright (C) 2022 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 "dcpomatic_time_coalesce.h"
+
+
+namespace dcpomatic {
+
+
+template <class T>
+std::list<TimePeriod<T>> overlap (std::list<TimePeriod<T>> const & A, std::list<TimePeriod<T>> const& B)
+{
+	std::list<TimePeriod<T>> result;
+
+	for (auto i: A) {
+		for (auto j: B) {
+			if (auto ov = i.overlap(j)) {
+				result.push_back(*ov);
+			}
+		}
+	}
+
+	return coalesce (result);
+}
+
+
+}
+
diff --git a/test/dcpomatic_time_test.cc b/test/dcpomatic_time_test.cc
index 21739d185..80e0a9893 100644
--- a/test/dcpomatic_time_test.cc
+++ b/test/dcpomatic_time_test.cc
@@ -27,6 +27,7 @@
 
 #include "lib/dcpomatic_time.h"
 #include "lib/dcpomatic_time_coalesce.h"
+#include "lib/dcpomatic_time_overlap.h"
 #include <boost/test/unit_test.hpp>
 #include <iostream>
 #include <list>
@@ -427,3 +428,109 @@ BOOST_AUTO_TEST_CASE (dcpomatic_time_floor_test)
 	/* Check that rounding down to non-integer frame rates works */
 	BOOST_CHECK_EQUAL (DCPTime(45312).floor(29.976).get(), 44836);
 }
+
+
+BOOST_AUTO_TEST_CASE (dcpomatic_time_overlap_test1)
+{
+	list<DCPTimePeriod> A = {
+		{ DCPTime(0), DCPTime(5) }
+	};
+
+	BOOST_CHECK (overlap(A, std::list<DCPTimePeriod>()).empty());
+	BOOST_CHECK (overlap(std::list<DCPTimePeriod>(), A).empty());
+}
+
+
+BOOST_AUTO_TEST_CASE (dcpomatic_time_overlap_test2)
+{
+	list<DCPTimePeriod> A = {
+		{ DCPTime(0), DCPTime(5) }
+	};
+
+	list<DCPTimePeriod> B = {
+		{ DCPTime(6), DCPTime(10) }
+	};
+
+	BOOST_CHECK (overlap(A, B).empty());
+	BOOST_CHECK (overlap(B, A).empty());
+}
+
+
+BOOST_AUTO_TEST_CASE (dcpomatic_time_overlap_test3)
+{
+	list<DCPTimePeriod> A = {
+		{ DCPTime(0), DCPTime(5) }
+	};
+
+	list<DCPTimePeriod> B = {
+		{ DCPTime(2), DCPTime(3) }
+	};
+
+	std::list<DCPTimePeriod> correct = {
+		{ DCPTime(2), DCPTime(3) }
+	};
+
+	BOOST_CHECK (overlap(A, B) == correct);
+	BOOST_CHECK (overlap(B, A) == correct);
+}
+
+
+BOOST_AUTO_TEST_CASE (dcpomatic_time_overlap_test4)
+{
+	list<DCPTimePeriod> A = {
+		{ DCPTime(0), DCPTime(5) }
+	};
+
+	list<DCPTimePeriod> B = {
+		{ DCPTime(0), DCPTime(5) }
+	};
+
+	std::list<DCPTimePeriod> correct = {
+		{ DCPTime(0), DCPTime(5) }
+	};
+
+	BOOST_CHECK (overlap(A, B) == correct);
+	BOOST_CHECK (overlap(B, A) == correct);
+}
+
+
+BOOST_AUTO_TEST_CASE (dcpomatic_time_overlap_test5)
+{
+	list<DCPTimePeriod> A = {
+		{ DCPTime(0), DCPTime(5) },
+		{ DCPTime(7), DCPTime(12) }
+	};
+
+	list<DCPTimePeriod> B = {
+		{ DCPTime(0), DCPTime(15) }
+	};
+
+	std::list<DCPTimePeriod> correct = {
+		{ DCPTime(0), DCPTime(5) },
+		{ DCPTime(7), DCPTime(12) }
+	};
+
+	BOOST_CHECK (overlap(A, B) == correct);
+	BOOST_CHECK (overlap(B, A) == correct);
+}
+
+
+BOOST_AUTO_TEST_CASE (dcpomatic_time_overlap_test6)
+{
+	list<DCPTimePeriod> A = {
+		{ DCPTime(0), DCPTime(5) },
+		{ DCPTime(7), DCPTime(12) }
+	};
+
+	list<DCPTimePeriod> B = {
+		{ DCPTime(3), DCPTime(10) }
+	};
+
+	std::list<DCPTimePeriod> correct = {
+		{ DCPTime(3), DCPTime(5) },
+		{ DCPTime(7), DCPTime(10) }
+	};
+
+	BOOST_CHECK (overlap(A, B) == correct);
+	BOOST_CHECK (overlap(B, A) == correct);
+}