Add PixelQuanta::round taking floats.

4 files changed, 49 insertions, 0 deletions

diff --git a/src/lib/pixel_quanta.cc b/src/lib/pixel_quanta.cc
index 7c1d285cf..30894ddb7 100644
--- a/src/lib/pixel_quanta.cc
+++ b/src/lib/pixel_quanta.cc
@@ -60,6 +60,19 @@ PixelQuanta::round (dcp::Size size) const
 }
 
 
+dcp::Size
+PixelQuanta::round(float x_, float y_) const
+{
+	auto round_one = [](float v, int q) {
+		return q == 1
+			? static_cast<int>(std::lround(v))
+			: (static_cast<int>(v) + static_cast<int>(v) % q);
+	};
+
+	return { round_one(x_, x), round_one(y_, y) };
+}
+
+
 PixelQuanta
 max (PixelQuanta const& a, PixelQuanta const& b)
 {
diff --git a/src/lib/pixel_quanta.h b/src/lib/pixel_quanta.h
index 37d2321f4..bef23b2b1 100644
--- a/src/lib/pixel_quanta.h
+++ b/src/lib/pixel_quanta.h
@@ -55,6 +55,7 @@ public:
 	int round_x (int x_) const;
 	int round_y (int y_) const;
 	dcp::Size round (dcp::Size size) const;
+	dcp::Size round(float x, float y) const;
 
 	int x;
 	int y;
diff --git a/test/pixel_quanta_test.cc b/test/pixel_quanta_test.cc
new file mode 100644
index 000000000..b07981577
--- /dev/null
+++ b/test/pixel_quanta_test.cc
@@ -0,0 +1,34 @@
+/*
+    Copyright (C) 2023 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 "lib/pixel_quanta.h"
+#include <boost/test/unit_test.hpp>
+
+
+BOOST_AUTO_TEST_CASE(pixel_quanta_test)
+{
+	BOOST_CHECK(PixelQuanta(1, 1).round(9.3, 5.9) == dcp::Size(9, 6));
+	BOOST_CHECK(PixelQuanta(1, 1).round(11.7, 5.1) == dcp::Size(12, 5));
+	BOOST_CHECK(PixelQuanta(2, 2).round(9.3, 5.9) == dcp::Size(10, 6));
+	BOOST_CHECK(PixelQuanta(2, 2).round(8.9, 11.9) == dcp::Size(8, 12));
+
+}
+
diff --git a/test/wscript b/test/wscript
index f40568e3c..f992cfb63 100644
--- a/test/wscript
+++ b/test/wscript
@@ -123,6 +123,7 @@ def build(bld):
                  optimise_stills_test.cc
                  overlap_video_test.cc
                  pixel_formats_test.cc
+                 pixel_quanta_test.cc
                  player_test.cc
                  playlist_test.cc
                  pulldown_detect_test.cc