Implement closed shadow adjustment for Element.offsetParent

third_party/WebKit/Source/core/dom/Node.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 618 matching lines @@
         return document();
     Node* root = const_cast<Node*>(this);
     while (Node* host = root->shadowHost())
         root = host;
     while (Node* ancestor = root->parentNode())
         root = ancestor;
     DCHECK(!root->shadowHost());
     return *root;
 }
 
+bool Node::isUnclosedNodeOf(const Node& other) const
+{
+    if (!isInShadowTree() || treeScope() == other.treeScope())
+        return true;
+
+    const TreeScope* scope = &treeScope();
+    for (; scope->parentTreeScope(); scope = scope->parentTreeScope()) {
+        const ContainerNode& root = scope->rootNode();
+        if (root.isShadowRoot() && !toShadowRoot(root).isOpenOrV0())
+            break;
+    }
+
+    for (TreeScope* otherScope = &other.treeScope(); otherScope; otherScope = otherScope->parentTreeScope()) {
+        if (otherScope == scope)
+            return true;
+    }
+    return false;
+}
+
 bool Node::needsDistributionRecalc() const
 {
     return shadowIncludingRoot().childNeedsDistributionRecalc();
 }
 
 void Node::updateDistribution()
 {
     // Extra early out to avoid spamming traces.
     if (inShadowIncludingDocument() && !document().childNeedsDistributionRecalc())
         return;
@@ skipping 1835 matching lines @@
 
 void showNodePath(const blink::Node* node)
 {
     if (node)
         node->showNodePathForThis();
     else
         fprintf(stderr, "Cannot showNodePath for (nil)\n");
 }
 
 #endif