[SPv2] Adds pre-computed paint property context to PaintLayer.

third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilderTest.cpp

 // Copyright 2015 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/LayoutTestHelper.h"
 #include "core/layout/LayoutTreeAsText.h"
 #include "core/layout/LayoutView.h"
 #include "core/paint/ObjectPaintProperties.h"
 #include "platform/graphics/paint/TransformPaintPropertyNode.h"
 #include "platform/testing/UnitTestHelpers.h"
@@ skipping 116 matching lines @@
     EXPECT_EQ(TransformationMatrix(), frameView->preTranslation()->matrix());
     EXPECT_EQ(nullptr, frameView->preTranslation()->parent());
     EXPECT_EQ(TransformationMatrix().translate(0, -100), frameView->scrollTranslation()->matrix());
     EXPECT_EQ(frameView->preTranslation(), frameView->scrollTranslation()->parent());
     EXPECT_EQ(frameView->preTranslation(), frameView->contentClip()->localTransformSpace());
     EXPECT_EQ(FloatRoundedRect(0, 0, 800, 600), frameView->contentClip()->clipRect());
     EXPECT_EQ(nullptr, frameView->contentClip()->parent());
 
     LayoutView* layoutView = document().layoutView();
     ObjectPaintProperties* layoutViewProperties = layoutView->objectPaintProperties();
-    EXPECT_EQ(nullptr, layoutViewProperties);
+    EXPECT_EQ(nullptr, layoutViewProperties->scrollTranslation());
 }
 
 // TODO(trchen): Settings::rootLayerScrolls cannot be switched after main frame being created.
 // Need to set it during test setup. Besides that, the test still won't work because
 // root layer scrolling mode is not compatible with SPv2 at this moment.
 // (Duplicate display item ID for FrameView and LayoutView.)
 TEST_F(PaintPropertyTreeBuilderTest, DISABLED_FrameScrollingRootLayerScrolls)
 {
     document().settings()->setRootLayerScrolls(true);
 
@@ skipping 121 matching lines @@
         "  </div>"
         "</div>");
 
     LayoutObject& nodeWithOpacity = *document().getElementById("nodeWithOpacity")->layoutObject();
     ObjectPaintProperties* nodeWithOpacityProperties = nodeWithOpacity.objectPaintProperties();
     EXPECT_EQ(0.6f, nodeWithOpacityProperties->effect()->opacity());
     EXPECT_EQ(nullptr, nodeWithOpacityProperties->effect()->parent());
     EXPECT_EQ(nullptr, nodeWithOpacityProperties->transform());
 
     LayoutObject& childWithStackingContext = *document().getElementById("childWithStackingContext")->layoutObject();
-    EXPECT_EQ(nullptr, childWithStackingContext.objectPaintProperties());
+    ObjectPaintProperties* childWithStackingContextProperties = childWithStackingContext.objectPaintProperties();
+    EXPECT_EQ(nullptr, childWithStackingContextProperties->effect());
+    EXPECT_EQ(nullptr, childWithStackingContextProperties->transform());
 
     LayoutObject& grandChildWithOpacity = *document().getElementById("grandChildWithOpacity")->layoutObject();
     ObjectPaintProperties* grandChildWithOpacityProperties = grandChildWithOpacity.objectPaintProperties();
     EXPECT_EQ(0.4f, grandChildWithOpacityProperties->effect()->opacity());
     EXPECT_EQ(nodeWithOpacityProperties->effect(), grandChildWithOpacityProperties->effect()->parent());
     EXPECT_EQ(nullptr, grandChildWithOpacityProperties->transform());
 }
 
 TEST_F(PaintPropertyTreeBuilderTest, EffectNodesInSVG)
 {
@@ skipping 277 matching lines @@
 
     LayoutObject& divWithTransform = *document().getElementById("divWithTransform")->layoutObject();
     ObjectPaintProperties* divWithTransformProperties = divWithTransform.objectPaintProperties();
     EXPECT_EQ(TransformationMatrix().translate3d(1, 2, 3), divWithTransformProperties->transform()->matrix());
 
     LayoutObject* innerDivWithTransform = frameDocument.getElementById("transform")->layoutObject();
     ObjectPaintProperties* innerDivWithTransformProperties = innerDivWithTransform->objectPaintProperties();
     EXPECT_EQ(TransformationMatrix().translate3d(4, 5, 6), innerDivWithTransformProperties->transform()->matrix());
 }
 
+TEST_F(PaintPropertyTreeBuilderTest, TreeContextClipByNonStackingContext)
+{
+    // This test verifies the tree builder correctly computes and records the property tree context
+    // for a (pseudo) stacking context that is scrolled by a containing block that is not one of
+    // the painting ancestors.
+    setBodyInnerHTML(
+        "<style>body { margin: 0; }</style>"
+        "<div id='scroller' style='overflow:scroll; width:400px; height:300px;'>"
+        "  <div id='child' style='position:relative;'></div>"
+        "  <div style='height:10000px;'></div>"
+        "</div>"
+    );
+
+    LayoutObject& scroller = *document().getElementById("scroller")->layoutObject();
+    ObjectPaintProperties* scrollerProperties = scroller.objectPaintProperties();
+    LayoutObject& child = *document().getElementById("child")->layoutObject();
+    ObjectPaintProperties* childProperties = child.objectPaintProperties();
+
+    EXPECT_EQ(scrollerProperties->overflowClip(), childProperties->localBorderBoxProperties()->properties.clip);
+    EXPECT_EQ(scrollerProperties->scrollTranslation(), childProperties->localBorderBoxProperties()->properties.transform);
+    EXPECT_EQ(nullptr, childProperties->localBorderBoxProperties()->properties.effect);
+}
+
+TEST_F(PaintPropertyTreeBuilderTest, TreeContextUnclipFromParentStackingContext)
+{
+    // This test verifies the tree builder correctly computes and records the property tree context
+    // for a (pseudo) stacking context that has a scrolling painting ancestor that is not its
+    // containing block (thus should not be scrolled by it).
+
+    setBodyInnerHTML(
+        "<style>body { margin: 0; }</style>"
+        "<div id='scroller' style='overflow:scroll; opacity:0.5;'>"
+        "  <div id='child' style='position:absolute; left:0; top:0;'></div>"
+        "  <div style='height:10000px;'></div>"
+        "</div>"
+    );
+
+    FrameView* frameView = document().view();
+    LayoutObject& scroller = *document().getElementById("scroller")->layoutObject();
+    ObjectPaintProperties* scrollerProperties = scroller.objectPaintProperties();
+    LayoutObject& child = *document().getElementById("child")->layoutObject();
+    ObjectPaintProperties* childProperties = child.objectPaintProperties();
+
+    EXPECT_EQ(frameView->contentClip(), childProperties->localBorderBoxProperties()->properties.clip);
+    EXPECT_EQ(frameView->scrollTranslation(), childProperties->localBorderBoxProperties()->properties.transform);
+    EXPECT_EQ(scrollerProperties->effect(), childProperties->localBorderBoxProperties()->properties.effect);
+}
+
 } // namespace blink