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diff --git a/getdown/src/getdown/core/src/main/java/com/threerings/getdown/util/Rectangle.java b/getdown/src/getdown/core/src/main/java/com/threerings/getdown/util/Rectangle.java
new file mode 100644
index 0000000..3671d7d
--- /dev/null
+++ b/getdown/src/getdown/core/src/main/java/com/threerings/getdown/util/Rectangle.java
@@ -0,0 +1,40 @@
+//
+// Getdown - application installer, patcher and launcher
+// Copyright (C) 2004-2018 Getdown authors
+// https://github.com/threerings/getdown/blob/master/LICENSE
+
+package com.threerings.getdown.util;
+
+/**
+ * An immutable rectangle.
+ */
+public class Rectangle
+{
+    public final int x;
+    public final int y;
+    public final int width;
+    public final int height;
+
+    public Rectangle (int x, int y, int width, int height)
+    {
+        this.x = x;
+        this.y = y;
+        this.width = width;
+        this.height = height;
+    }
+
+    public Rectangle union (Rectangle other) {
+        int x1 = Math.min(x, other.x);
+        int x2 = Math.max(x + width, other.x + other.width);
+        int y1 = Math.min(y, other.y);
+        int y2 = Math.max(y + height, other.y + other.height);
+        return new Rectangle(x1, y1, x2 - x1, y2 - y1);
+    }
+
+    /** {@inheritDoc} */
+    public String toString ()
+    {
+        return getClass().getName() + "[x=" + x + ", y=" + y +
+            ", width=" + width + ", height=" + height + "]";
+    }
+}