nodeAtPoint(): Perform the early-check EARLY.

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  *           (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Adobe Systems Incorporated. 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
@@ skipping 1183 matching lines @@
     if (!isLayoutView()) {
         // Check if we need to do anything at all.
         // If we have clipping, then we can't have any spillout.
         LayoutRect overflowBox = hasOverflowClip() ? borderBoxRect() : visualOverflowRect();
         flipForWritingMode(overflowBox);
         overflowBox.moveBy(adjustedLocation);
         if (!locationInContainer.intersects(overflowBox))
             return false;
     }
 
+    bool shouldHitTestSelf = isInSelfHitTestingPhase(action);
+
+    if (shouldHitTestSelf && hasOverflowClip()
+        && hitTestOverflowControl(result, locationInContainer, adjustedLocation))
+        return true;
+
     // TODO(pdr): We should also check for css clip in the !isSelfPaintingLayer
     //            case, similar to overflow clip below.
     bool skipChildren = false;
     if (hasOverflowClip() && !hasSelfPaintingLayer()) {
         if (!locationInContainer.intersects(overflowClipRect(adjustedLocation, ExcludeOverlayScrollbarSizeForHitTesting))) {
             skipChildren = true;
         } else if (style()->hasBorderRadius()) {
             LayoutRect boundsRect(adjustedLocation, size());
             skipChildren = !locationInContainer.intersects(style()->getRoundedInnerBorderFor(boundsRect));
         }
     }
 
     // A control clip can also clip out child hit testing.
     if (!skipChildren && hasControlClip() && !locationInContainer.intersects(controlClipRect(adjustedLocation)))
         skipChildren = true;
 
     // TODO(pdr): We should also include checks for hit testing border radius at
     //            the layer level (see: crbug.com/568904).
 
     if (!skipChildren && hitTestChildren(result, locationInContainer, adjustedLocation, action))
         return true;
 
     if (hitTestClippedOutByRoundedBorder(locationInContainer, adjustedLocation))
         return false;
 
     // Now hit test ourselves.
-    if (isInSelfHitTestingPhase(action) && visibleToHitTestRequest(result.hitTestRequest())) {
+    if (shouldHitTestSelf && visibleToHitTestRequest(result.hitTestRequest())) {
         LayoutRect boundsRect(adjustedLocation, size());
         if (locationInContainer.intersects(boundsRect)) {
             updateHitTestResult(result, flipForWritingMode(locationInContainer.point() - toLayoutSize(adjustedLocation)));
             if (result.addNodeToListBasedTestResult(nodeForHitTest(), locationInContainer, boundsRect) == StopHitTesting)
                 return true;
         }
     }
 
     return false;
 }
@@ skipping 3557 matching lines @@
 
 void LayoutBox::clearPercentHeightDescendants()
 {
     for (LayoutObject* curr = slowFirstChild(); curr; curr = curr->nextInPreOrder(this)) {
         if (curr->isBox())
             toLayoutBox(curr)->removeFromPercentHeightContainer();
     }
 }
 
 } // namespace blink