nodeAtPoint(): Perform the early-check EARLY.

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2010. 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
@@ skipping 1483 matching lines @@
 }
 
 Node* LayoutBlock::nodeForHitTest() const
 {
     // If we are in the margins of block elements that are part of a
     // continuation we're actually still inside the enclosing element
     // that was split. Use the appropriate inner node.
     return isAnonymousBlockContinuation() ? continuation()->node() : node();
 }
 
-bool LayoutBlock::nodeAtPoint(HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction hitTestAction)
+bool LayoutBlock::hitTestOverflowControl(HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& adjustedLocation)
 {
-    LayoutPoint adjustedLocation(accumulatedOffset + location());
-    LayoutSize localOffset = toLayoutSize(adjustedLocation);
-
-    if (isInSelfHitTestingPhase(hitTestAction)
-        && visibleToHitTestRequest(result.hitTestRequest())
+    if (visibleToHitTestRequest(result.hitTestRequest())
         && isPointInOverflowControl(result, locationInContainer.point(), adjustedLocation)) {
-        updateHitTestResult(result, locationInContainer.point() - localOffset);
+        updateHitTestResult(result, locationInContainer.point() - toLayoutSize(adjustedLocation));
         // FIXME: isPointInOverflowControl() doesn't handle rect-based tests yet.
         if (result.addNodeToListBasedTestResult(nodeForHitTest(), locationInContainer) == StopHitTesting)
             return true;
     }
-    return LayoutBox::nodeAtPoint(result, locationInContainer, accumulatedOffset, hitTestAction);
+    return false;
 }
 
 bool LayoutBlock::hitTestChildren(HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction hitTestAction)
 {
     ASSERT(!childrenInline());
     LayoutPoint scrolledOffset(hasOverflowClip() ? accumulatedOffset - scrolledContentOffset() : accumulatedOffset);
     HitTestAction childHitTest = hitTestAction;
     if (hitTestAction == HitTestChildBlockBackgrounds)
         childHitTest = HitTestChildBlockBackground;
     for (LayoutBox* child = lastChildBox(); child; child = child->previousSiblingBox()) {
@@ skipping 902 matching lines @@
         for (TrackedLayoutBoxListHashSet::const_iterator it = positionedDescendantSet->begin(); it != end; ++it) {
             LayoutBox* currBox = *it;
             ASSERT(!currBox->needsLayout());
         }
     }
 }
 
 #endif
 
 } // namespace blink