1 files changed, 21 insertions, 0 deletions
diff --git a/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Culling/RectangularVertexClipper.cs b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Culling/RectangularVertexClipper.cs
new file mode 100644
index 0000000..6d12322
--- /dev/null
+++ b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Culling/RectangularVertexClipper.cs
@@ -0,0 +1,21 @@
+namespace UnityEngine.UI
+{
+    internal class RectangularVertexClipper
+    {
+        readonly Vector3[] m_WorldCorners = new Vector3[4];
+        readonly Vector3[] m_CanvasCorners = new Vector3[4];
+
+        public Rect GetCanvasRect(RectTransform t, Canvas c)
+        {
+            if (c == null)
+                return new Rect();
+
+            t.GetWorldCorners(m_WorldCorners);
+            var canvasTransform = c.GetComponent<Transform>();
+            for (int i = 0; i < 4; ++i)
+                m_CanvasCorners[i] = canvasTransform.InverseTransformPoint(m_WorldCorners[i]);
+
+            return new Rect(m_CanvasCorners[0].x, m_CanvasCorners[0].y, m_CanvasCorners[2].x - m_CanvasCorners[0].x, m_CanvasCorners[2].y - m_CanvasCorners[0].y);
+        }
+    }
+}