From 1d2d23191b03e61911eb3033fad64abe7a6ca8a5 Mon Sep 17 00:00:00 2001
From: Xidorn Quan <quanxunzhen@gmail.com>
Date: Fri, 24 Apr 2015 10:15:32 +1200
Subject: [PATCH] Bug 1117227 part 1 - Add IntersectRect method to LogicalRect.
 r=jfkthame

--HG--
extra : source : 3c42cbab1f5087c5411984c69b2f06939b735e93
---
 layout/generic/WritingModes.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/layout/generic/WritingModes.h b/layout/generic/WritingModes.h
index adafba9f675e..c4d817693d68 100644
--- a/layout/generic/WritingModes.h
+++ b/layout/generic/WritingModes.h
@@ -1731,6 +1731,17 @@ public:
                           aContainerWidth);
   }
 
+  /**
+   * Set *this to be the rectangle containing the intersection of aRect1
+   * and aRect2, return whether the intersection is non-empty.
+   */
+  bool IntersectRect(const LogicalRect& aRect1, const LogicalRect& aRect2)
+  {
+    CHECK_WRITING_MODE(aRect1.mWritingMode);
+    CHECK_WRITING_MODE(aRect2.mWritingMode);
+    return mRect.IntersectRect(aRect1.mRect, aRect2.mRect);
+  }
+
 private:
   LogicalRect() = delete;