Support edge-inclusive intersections in mapToVisibleRectInAncestorSpace

third_party/WebKit/Source/platform/geometry/LayoutRectTest.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "platform/geometry/LayoutRect.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 #ifndef NDEBUG
 TEST(LayoutRectTest, ToString)
 {
     LayoutRect emptyRect = LayoutRect();
     EXPECT_EQ(String("0.000000,0.000000 0.000000x0.000000"), emptyRect.toString());
 
     LayoutRect rect(1, 2, 3, 4);
     EXPECT_EQ(String("1.000000,2.000000 3.000000x4.000000"), rect.toString());
 
     LayoutRect granularRect(LayoutUnit(1.6f), LayoutUnit(2.7f), LayoutUnit(3.8f), LayoutUnit(4.9f));
     EXPECT_EQ(String("1.593750,2.687500 3.796875x4.890625"), granularRect.toString());
 }
+
+TEST(LayoutRectTest, InclusiveIntersect)
+{
+    LayoutRect rect(11, 12, 0, 0);
+    EXPECT_TRUE(rect.inclusiveIntersect(LayoutRect(11, 12, 13, 14)));
+    EXPECT_EQ(rect, LayoutRect(11, 12, 0, 0));
+
+    rect = LayoutRect(11, 12, 13, 14);
+    EXPECT_TRUE(rect.inclusiveIntersect(LayoutRect(24, 8, 0, 7)));
+    EXPECT_EQ(rect, LayoutRect(24, 12, 0, 3));
+
+    rect = LayoutRect(11, 12, 13, 14);
+    EXPECT_TRUE(rect.inclusiveIntersect(LayoutRect(9, 15, 4, 0)));
+    EXPECT_EQ(rect, LayoutRect(11, 15, 2, 0));
+
+    rect = LayoutRect(11, 12, 0, 14);
+    EXPECT_FALSE(rect.inclusiveIntersect(LayoutRect(12, 13, 15, 16)));
+    EXPECT_EQ(rect, LayoutRect());
+}
 #endif
 
 } // namespace blink