Support for mapping from outer/visual to flowthread coord space in nested multicol.

third_party/WebKit/Source/core/layout/MapCoordinatesTest.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 "core/layout/LayoutInline.h"
 #include "core/layout/LayoutTestHelper.h"
 #include "core/layout/LayoutView.h"
 #include "platform/geometry/TransformState.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 557 matching lines @@
     LayoutBox* target = toLayoutBox(getLayoutObjectByElementId("target"));
     LayoutBox* outerMulticol = toLayoutBox(getLayoutObjectByElementId("outerMulticol"));
     LayoutBox* innerMulticol = toLayoutBox(getLayoutObjectByElementId("innerMulticol"));
     LayoutBox* innerFlowThread = target->parentBox();
     ASSERT_TRUE(innerFlowThread->isLayoutFlowThread());
     LayoutBox* outerFlowThread = innerMulticol->parentBox();
     ASSERT_TRUE(outerFlowThread->isLayoutFlowThread());
 
     FloatPoint mappedPoint = mapLocalToAncestor(target, outerMulticol, FloatPoint());
     EXPECT_EQ(FloatPoint(435, 115), mappedPoint);
-
-    // TODO(mstensho): Add mapAncestorToLocal() tests when it starts working in nested multicol.
+    mappedPoint = mapAncestorToLocal(target, outerMulticol, mappedPoint);
+    EXPECT_EQ(FloatPoint(), mappedPoint);
 
     // Walk each ancestor in the chain separately, to verify each step on the way.
     mappedPoint = mapLocalToAncestor(target, innerFlowThread, FloatPoint());
     EXPECT_EQ(FloatPoint(0, 630), mappedPoint);
+    mappedPoint = mapAncestorToLocal(target, innerFlowThread, mappedPoint);
+    EXPECT_EQ(FloatPoint(), mappedPoint);
 
-    mappedPoint = mapLocalToAncestor(innerFlowThread, innerMulticol, mappedPoint);
+    mappedPoint = mapLocalToAncestor(innerFlowThread, innerMulticol, FloatPoint(0, 630));
+    EXPECT_EQ(FloatPoint(140, 305), mappedPoint);
+    mappedPoint = mapAncestorToLocal(innerFlowThread, innerMulticol, mappedPoint);
+    EXPECT_EQ(FloatPoint(0, 630), mappedPoint);
+
+    mappedPoint = mapLocalToAncestor(innerMulticol, outerFlowThread, FloatPoint(140, 305));
+    EXPECT_EQ(FloatPoint(140, 315), mappedPoint);
+    mappedPoint = mapAncestorToLocal(innerMulticol, outerFlowThread, mappedPoint);
     EXPECT_EQ(FloatPoint(140, 305), mappedPoint);
 
-    mappedPoint = mapLocalToAncestor(innerMulticol, outerFlowThread, mappedPoint);
+    mappedPoint = mapLocalToAncestor(outerFlowThread, outerMulticol, FloatPoint(140, 315));
+    EXPECT_EQ(FloatPoint(435, 115), mappedPoint);
+    mappedPoint = mapAncestorToLocal(outerFlowThread, outerMulticol, mappedPoint);
     EXPECT_EQ(FloatPoint(140, 315), mappedPoint);
-
-    mappedPoint = mapLocalToAncestor(outerFlowThread, outerMulticol, mappedPoint);
-    EXPECT_EQ(FloatPoint(435, 115), mappedPoint);
 }
 
 TEST_F(MapCoordinatesTest, MulticolWithAbsPosInRelPos)
 {
     setBodyInnerHTML(
         "<div id='multicol' style='-webkit-columns:3; -webkit-column-gap:0; column-fill:auto; width:300px; height:100px; border:8px solid; padding:7px;'>"
         "    <div style='height:110px;'></div>"
         "    <div id='relpos' style='position:relative; left:4px; top:4px;'>"
         "        <div id='target' style='position:absolute; left:15px; top:15px; margin:10px; border:13px; padding:13px;'></div>"
         "    </div>"
@@ skipping 557 matching lines @@
 
     // With child2, each rotation gets flattened and the end result is approximately a 90-degree rotation.
     matrix = child2->localToAbsoluteTransform();
     EXPECT_NEAR(50.0, matrix.projectPoint(FloatPoint(100.0, 50.0)).x(), LayoutUnit::epsilon());
     EXPECT_NEAR(50.0, matrix.projectPoint(FloatPoint(100.0, 50.0)).y(), LayoutUnit::epsilon());
     EXPECT_NEAR(25.0, matrix.projectPoint(FloatPoint(50.0, 100.0)).x(), LayoutUnit::epsilon());
     EXPECT_NEAR(100.0, matrix.projectPoint(FloatPoint(50.0, 100.0)).y(), LayoutUnit::epsilon());
 }
 
 } // namespace blink