Add PixelQuanta::round taking floats.

2 files changed, 14 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;