GeometryMapper: Support computing visual rects in spaces that are not direct ancestors.

third_party/WebKit/Source/platform/graphics/paint/PropertyTreeStateTest.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/graphics/paint/PropertyTreeState.h"
+
+#include "platform/geometry/LayoutRect.h"
+#include "platform/graphics/paint/ClipPaintPropertyNode.h"
+#include "platform/graphics/paint/EffectPaintPropertyNode.h"
+#include "platform/graphics/paint/TransformPaintPropertyNode.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace blink {
+
+class PropertyTreeStateTest : public ::testing::Test {
+public:
+    RefPtr<TransformPaintPropertyNode> rootTransformNode;
+    RefPtr<ClipPaintPropertyNode> rootClipNode;
+    RefPtr<EffectPaintPropertyNode> rootEffectNode;
+
+    PropertyTreeState rootPropertyTreeState()
+    {
+        PropertyTreeState state(rootTransformNode.get(), rootClipNode.get(), rootEffectNode.get());
+        return state;
+    }
+
+private:
+    void SetUp() override
+    {
+        rootTransformNode = TransformPaintPropertyNode::create(TransformationMatrix(), FloatPoint3D(), nullptr);
+        rootClipNode = ClipPaintPropertyNode::create(rootTransformNode, FloatRoundedRect(LayoutRect::infiniteIntRect()), nullptr);
+        rootEffectNode = EffectPaintPropertyNode::create(1.0, nullptr);
+    }
+};
+
+TEST_F(PropertyTreeStateTest, LeastCommonAncestor)
+{
+    TransformationMatrix matrix;
+    RefPtr<TransformPaintPropertyNode> child1 = TransformPaintPropertyNode::create(matrix, FloatPoint3D(), rootPropertyTreeState().transform);
+    RefPtr<TransformPaintPropertyNode> child2 = TransformPaintPropertyNode::create(matrix, FloatPoint3D(), rootPropertyTreeState().transform);
+
+    RefPtr<TransformPaintPropertyNode> childOfChild1 = TransformPaintPropertyNode::create(matrix, FloatPoint3D(), child1);
+    RefPtr<TransformPaintPropertyNode> childOfChild2 = TransformPaintPropertyNode::create(matrix, FloatPoint3D(), child2);
+
+    EXPECT_EQ(rootPropertyTreeState().transform, propertyTreeNearestCommonAncestor<TransformPaintPropertyNode>(childOfChild1.get(), childOfChild2.get()));
+    EXPECT_EQ(rootPropertyTreeState().transform, propertyTreeNearestCommonAncestor<TransformPaintPropertyNode>(childOfChild1.get(), child2.get()));
+    EXPECT_EQ(rootPropertyTreeState().transform, propertyTreeNearestCommonAncestor<TransformPaintPropertyNode>(childOfChild1.get(), rootPropertyTreeState().transform.get()));
+    EXPECT_EQ(child1, propertyTreeNearestCommonAncestor<TransformPaintPropertyNode>(childOfChild1.get(), child1.get()));
+
+    EXPECT_EQ(rootPropertyTreeState().transform, propertyTreeNearestCommonAncestor<TransformPaintPropertyNode>(childOfChild2.get(), childOfChild1.get()));
+    EXPECT_EQ(rootPropertyTreeState().transform, propertyTreeNearestCommonAncestor<TransformPaintPropertyNode>(childOfChild2.get(), child1.get()));
+    EXPECT_EQ(rootPropertyTreeState().transform, propertyTreeNearestCommonAncestor<TransformPaintPropertyNode>(childOfChild2.get(), rootPropertyTreeState().transform.get()));
+    EXPECT_EQ(child2, propertyTreeNearestCommonAncestor<TransformPaintPropertyNode>(childOfChild2.get(), child2.get()));
+
+    EXPECT_EQ(rootPropertyTreeState().transform, propertyTreeNearestCommonAncestor<TransformPaintPropertyNode>(child1.get(), child2.get()));
+}
+
+} // namespace blink