Intersection Observer support for OOPIF

third_party/WebKit/Source/core/layout/LayoutView.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc.
  *               All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 440 matching lines @@
 
 bool LayoutView::mapToVisualRectInAncestorSpace(
     const LayoutBoxModelObject* ancestor,
     LayoutRect& rect,
     MapCoordinatesFlags mode,
     VisualRectFlags visualRectFlags) const {
   if (mode & IsFixed)
     rect.move(offsetForFixedPosition(true));
 
   // Apply our transform if we have one (because of full page zooming).
-  if (!ancestor && layer() && layer()->transform())
+  if (layer() && layer()->transform())
     rect = layer()->transform()->mapRect(rect);
 
-  ASSERT(ancestor);
   if (ancestor == this)
     return true;
 
   Element* owner = document().localOwner();
-  if (!owner)
+  if (!owner) {
+    // This is the case of a Frame with a remote parent.
+    if (!document().frame()->isMainFrame()) {
+      DCHECK(!ancestor);
+      LayoutRect viewportIntersectionRect(
+          frameView()->remoteViewportIntersection());
+      rect.intersect(viewportIntersectionRect);
+      if (rect.isEmpty())
+        return false;
+    }
     return true;
+  }
 
   if (LayoutBox* obj = owner->layoutBox()) {
     if (!(mode & InputIsInFrameCoordinates)) {
       // Intersect the viewport with the visual rect.
       LayoutRect viewRectangle = viewRect();
       if (visualRectFlags & EdgeInclusive) {
         if (!rect.inclusiveIntersect(viewRectangle))
           return false;
       } else {
         rect.intersect(viewRectangle);
@@ skipping 557 matching lines @@
   if (block)
     block->adjustChildDebugRect(rect);
 
   rect.setWidth(LayoutUnit(viewWidth(IncludeScrollbars)));
   rect.setHeight(LayoutUnit(viewHeight(IncludeScrollbars)));
 
   return rect;
 }
 
 }  // namespace blink