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<div id="msg">
<dl class="meta">
<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/182107">182107</a></dd>
<dt>Author</dt> <dd>simon.fraser@apple.com</dd>
<dt>Date</dt> <dd>2015-03-27 22:45:20 -0700 (Fri, 27 Mar 2015)</dd>
</dl>

<h3>Log Message</h3>
<pre>nullptr cleanup in RenderLayer
https://bugs.webkit.org/show_bug.cgi?id=143174

Reviewed by Ryosuke Niwa.

Replace 0 with nullptr in RenderLayer.cpp.

* rendering/RenderLayer.cpp:
(WebCore::RenderLayer::filterRenderer):
(WebCore::RenderLayer::updateLayerPositionsAfterLayout):
(WebCore::RenderLayer::updateLayerPositionsAfterOverflowScroll):
(WebCore::RenderLayer::positionNewlyCreatedOverflowControls):
(WebCore::RenderLayer::enclosingOverflowClipLayer):
(WebCore::RenderLayer::enclosingCompositingLayer):
(WebCore::RenderLayer::enclosingCompositingLayerForRepaint):
(WebCore::RenderLayer::enclosingFilterLayer):
(WebCore::RenderLayer::enclosingFilterRepaintLayer):
(WebCore::RenderLayer::clippingRootForPainting):
(WebCore::RenderLayer::transparentPaintingAncestor):
(WebCore::transparencyClipBox):
(WebCore::RenderLayer::removeChild):
(WebCore::RenderLayer::removeOnlyThisLayer):
(WebCore::RenderLayer::insertOnlyThisLayer):
(WebCore::accumulateOffsetTowardsAncestor):
(WebCore::RenderLayer::enclosingScrollableArea):
(WebCore::RenderLayer::enclosingPaginationLayerInSubtree):
(WebCore::RenderLayer::enclosingElement):
(WebCore::RenderLayer::enclosingFlowThreadAncestor):
(WebCore::RenderLayer::hitTestFixedLayersInNamedFlows):
(WebCore::RenderLayer::hitTestLayer):
(WebCore::RenderLayer::hitTestTransformedLayerInFragments):
(WebCore::RenderLayer::hitTestLayerByApplyingTransform):
(WebCore::RenderLayer::hitTestList):
(WebCore::RenderLayer::updateClipRects):
(WebCore::RenderLayer::clipRects):
(WebCore::RenderLayer::calculateClipRects):</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkSourceWebCoreChangeLog">trunk/Source/WebCore/ChangeLog</a></li>
<li><a href="#trunkSourceWebCorerenderingRenderLayercpp">trunk/Source/WebCore/rendering/RenderLayer.cpp</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkSourceWebCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/ChangeLog (182106 => 182107)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/ChangeLog        2015-03-28 05:04:23 UTC (rev 182106)
+++ trunk/Source/WebCore/ChangeLog        2015-03-28 05:45:20 UTC (rev 182107)
</span><span class="lines">@@ -1,3 +1,42 @@
</span><ins>+2015-03-27  Simon Fraser  &lt;simon.fraser@apple.com&gt;
+
+        nullptr cleanup in RenderLayer
+        https://bugs.webkit.org/show_bug.cgi?id=143174
+
+        Reviewed by Ryosuke Niwa.
+
+        Replace 0 with nullptr in RenderLayer.cpp.
+
+        * rendering/RenderLayer.cpp:
+        (WebCore::RenderLayer::filterRenderer):
+        (WebCore::RenderLayer::updateLayerPositionsAfterLayout):
+        (WebCore::RenderLayer::updateLayerPositionsAfterOverflowScroll):
+        (WebCore::RenderLayer::positionNewlyCreatedOverflowControls):
+        (WebCore::RenderLayer::enclosingOverflowClipLayer):
+        (WebCore::RenderLayer::enclosingCompositingLayer):
+        (WebCore::RenderLayer::enclosingCompositingLayerForRepaint):
+        (WebCore::RenderLayer::enclosingFilterLayer):
+        (WebCore::RenderLayer::enclosingFilterRepaintLayer):
+        (WebCore::RenderLayer::clippingRootForPainting):
+        (WebCore::RenderLayer::transparentPaintingAncestor):
+        (WebCore::transparencyClipBox):
+        (WebCore::RenderLayer::removeChild):
+        (WebCore::RenderLayer::removeOnlyThisLayer):
+        (WebCore::RenderLayer::insertOnlyThisLayer):
+        (WebCore::accumulateOffsetTowardsAncestor):
+        (WebCore::RenderLayer::enclosingScrollableArea):
+        (WebCore::RenderLayer::enclosingPaginationLayerInSubtree):
+        (WebCore::RenderLayer::enclosingElement):
+        (WebCore::RenderLayer::enclosingFlowThreadAncestor):
+        (WebCore::RenderLayer::hitTestFixedLayersInNamedFlows):
+        (WebCore::RenderLayer::hitTestLayer):
+        (WebCore::RenderLayer::hitTestTransformedLayerInFragments):
+        (WebCore::RenderLayer::hitTestLayerByApplyingTransform):
+        (WebCore::RenderLayer::hitTestList):
+        (WebCore::RenderLayer::updateClipRects):
+        (WebCore::RenderLayer::clipRects):
+        (WebCore::RenderLayer::calculateClipRects):
+
</ins><span class="cx"> 2015-03-27  Gwang Yoon Hwang  &lt;yoon@igalia.com&gt;
</span><span class="cx"> 
</span><span class="cx">         [TexMap] Seperate BitmapTexture related classes implementations from TextureMapper
</span></span></pre></div>
<a id="trunkSourceWebCorerenderingRenderLayercpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/rendering/RenderLayer.cpp (182106 => 182107)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/rendering/RenderLayer.cpp        2015-03-28 05:04:23 UTC (rev 182106)
+++ trunk/Source/WebCore/rendering/RenderLayer.cpp        2015-03-28 05:45:20 UTC (rev 182107)
</span><span class="lines">@@ -451,14 +451,14 @@
</span><span class="cx"> FilterEffectRenderer* RenderLayer::filterRenderer() const
</span><span class="cx"> {
</span><span class="cx">     FilterInfo* filterInfo = FilterInfo::getIfExists(*this);
</span><del>-    return filterInfo ? filterInfo-&gt;renderer() : 0;
</del><ins>+    return filterInfo ? filterInfo-&gt;renderer() : nullptr;
</ins><span class="cx"> }
</span><span class="cx"> 
</span><span class="cx"> void RenderLayer::updateLayerPositionsAfterLayout(const RenderLayer* rootLayer, UpdateLayerPositionsFlags flags)
</span><span class="cx"> {
</span><span class="cx">     RenderGeometryMap geometryMap(UseTransforms);
</span><span class="cx">     if (this != rootLayer)
</span><del>-        geometryMap.pushMappingsToAncestor(parent(), 0);
</del><ins>+        geometryMap.pushMappingsToAncestor(parent(), nullptr);
</ins><span class="cx">     updateLayerPositions(&amp;geometryMap, flags);
</span><span class="cx"> }
</span><span class="cx"> 
</span><span class="lines">@@ -816,7 +816,7 @@
</span><span class="cx"> {
</span><span class="cx">     RenderGeometryMap geometryMap(UseTransforms);
</span><span class="cx">     if (this != renderer().view().layer())
</span><del>-        geometryMap.pushMappingsToAncestor(parent(), 0);
</del><ins>+        geometryMap.pushMappingsToAncestor(parent(), nullptr);
</ins><span class="cx"> 
</span><span class="cx">     // FIXME: why is it OK to not check the ancestors of this layer in order to
</span><span class="cx">     // initialize the HasSeenViewportConstrainedAncestor and HasSeenAncestorWithOverflowClip flags?
</span><span class="lines">@@ -886,7 +886,7 @@
</span><span class="cx"> 
</span><span class="cx">     RenderGeometryMap geometryMap(UseTransforms);
</span><span class="cx">     if (this != renderer().view().layer() &amp;&amp; parent())
</span><del>-        geometryMap.pushMappingsToAncestor(parent(), 0);
</del><ins>+        geometryMap.pushMappingsToAncestor(parent(), nullptr);
</ins><span class="cx"> 
</span><span class="cx">     LayoutPoint offsetFromRoot = LayoutPoint(geometryMap.absolutePoint(FloatPoint()));
</span><span class="cx">     positionOverflowControls(toIntSize(roundedIntPoint(offsetFromRoot)));
</span><span class="lines">@@ -1016,7 +1016,7 @@
</span><span class="cx"> 
</span><span class="cx">         layer = layer-&gt;parent();
</span><span class="cx">     }
</span><del>-    return 0;
</del><ins>+    return nullptr;
</ins><span class="cx"> }
</span><span class="cx"> 
</span><span class="cx"> // FIXME: This is terrible. Bring back a cached bit for this someday. This crawl is going to slow down all
</span><span class="lines">@@ -1541,7 +1541,7 @@
</span><span class="cx">             return const_cast&lt;RenderLayer*&gt;(curr);
</span><span class="cx">     }
</span><span class="cx">          
</span><del>-    return 0;
</del><ins>+    return nullptr;
</ins><span class="cx"> }
</span><span class="cx"> 
</span><span class="cx"> RenderLayer* RenderLayer::enclosingCompositingLayerForRepaint(IncludeSelfOrNot includeSelf) const
</span><span class="lines">@@ -1554,7 +1554,7 @@
</span><span class="cx">             return const_cast&lt;RenderLayer*&gt;(curr);
</span><span class="cx">     }
</span><span class="cx">          
</span><del>-    return 0;
</del><ins>+    return nullptr;
</ins><span class="cx"> }
</span><span class="cx"> 
</span><span class="cx"> RenderLayer* RenderLayer::enclosingFilterLayer(IncludeSelfOrNot includeSelf) const
</span><span class="lines">@@ -1565,7 +1565,7 @@
</span><span class="cx">             return const_cast&lt;RenderLayer*&gt;(curr);
</span><span class="cx">     }
</span><span class="cx">     
</span><del>-    return 0;
</del><ins>+    return nullptr;
</ins><span class="cx"> }
</span><span class="cx"> 
</span><span class="cx"> RenderLayer* RenderLayer::enclosingFilterRepaintLayer() const
</span><span class="lines">@@ -1574,7 +1574,7 @@
</span><span class="cx">         if ((curr != this &amp;&amp; curr-&gt;requiresFullLayerImageForFilters()) || compositedWithOwnBackingStore(curr) || curr-&gt;isRootLayer())
</span><span class="cx">             return const_cast&lt;RenderLayer*&gt;(curr);
</span><span class="cx">     }
</span><del>-    return 0;
</del><ins>+    return nullptr;
</ins><span class="cx"> }
</span><span class="cx"> 
</span><span class="cx"> void RenderLayer::setFilterBackendNeedsRepaintingInRect(const LayoutRect&amp; rect)
</span><span class="lines">@@ -1642,7 +1642,7 @@
</span><span class="cx">     }
</span><span class="cx"> 
</span><span class="cx">     ASSERT_NOT_REACHED();
</span><del>-    return 0;
</del><ins>+    return nullptr;
</ins><span class="cx"> }
</span><span class="cx"> 
</span><span class="cx"> LayoutPoint RenderLayer::absoluteToContents(const LayoutPoint&amp; absolutePoint) const
</span><span class="lines">@@ -1663,15 +1663,15 @@
</span><span class="cx"> RenderLayer* RenderLayer::transparentPaintingAncestor()
</span><span class="cx"> {
</span><span class="cx">     if (isComposited())
</span><del>-        return 0;
</del><ins>+        return nullptr;
</ins><span class="cx"> 
</span><span class="cx">     for (RenderLayer* curr = parent(); curr; curr = curr-&gt;parent()) {
</span><span class="cx">         if (curr-&gt;isComposited())
</span><del>-            return 0;
</del><ins>+            return nullptr;
</ins><span class="cx">         if (curr-&gt;isTransparent())
</span><span class="cx">             return curr;
</span><span class="cx">     }
</span><del>-    return 0;
</del><ins>+    return nullptr;
</ins><span class="cx"> }
</span><span class="cx"> 
</span><span class="cx"> enum TransparencyClipBoxBehavior {
</span><span class="lines">@@ -1744,7 +1744,7 @@
</span><span class="cx">         // The best we can do here is to use enclosed bounding boxes to establish a &quot;fuzzy&quot; enough clip to encompass
</span><span class="cx">         // the transformed layer and all of its children.
</span><span class="cx">         RenderLayer::PaginationInclusionMode mode = transparencyBehavior == HitTestingTransparencyClipBox ? RenderLayer::IncludeCompositedPaginatedLayers : RenderLayer::ExcludeCompositedPaginatedLayers;
</span><del>-        const RenderLayer* paginationLayer = transparencyMode == DescendantsOfTransparencyClipBox ? layer.enclosingPaginationLayer(mode) : 0;
</del><ins>+        const RenderLayer* paginationLayer = transparencyMode == DescendantsOfTransparencyClipBox ? layer.enclosingPaginationLayer(mode) : nullptr;
</ins><span class="cx">         const RenderLayer* rootLayerForTransform = paginationLayer ? paginationLayer : rootLayer;
</span><span class="cx">         LayoutSize delta = layer.offsetFromAncestor(rootLayerForTransform);
</span><span class="cx"> 
</span><span class="lines">@@ -1901,9 +1901,9 @@
</span><span class="cx">     if (oldChild-&gt;renderer().isOutOfFlowPositioned() || oldChild-&gt;hasOutOfFlowPositionedDescendant())
</span><span class="cx">         dirtyAncestorChainHasOutOfFlowPositionedDescendantStatus();
</span><span class="cx"> 
</span><del>-    oldChild-&gt;setPreviousSibling(0);
-    oldChild-&gt;setNextSibling(0);
-    oldChild-&gt;setParent(0);
</del><ins>+    oldChild-&gt;setPreviousSibling(nullptr);
+    oldChild-&gt;setNextSibling(nullptr);
+    oldChild-&gt;setParent(nullptr);
</ins><span class="cx">     
</span><span class="cx">     oldChild-&gt;updateDescendantDependentFlags();
</span><span class="cx">     if (oldChild-&gt;m_hasVisibleContent || oldChild-&gt;m_hasVisibleDescendant)
</span><span class="lines">@@ -1950,7 +1950,7 @@
</span><span class="cx">         current-&gt;setRepaintStatus(NeedsFullRepaint);
</span><span class="cx">         // updateLayerPositions depends on hasLayer() already being false for proper layout.
</span><span class="cx">         ASSERT(!renderer().hasLayer());
</span><del>-        current-&gt;updateLayerPositions(0); // FIXME: use geometry map.
</del><ins>+        current-&gt;updateLayerPositions(); // FIXME: use geometry map.
</ins><span class="cx">         current = next;
</span><span class="cx">     }
</span><span class="cx"> 
</span><span class="lines">@@ -1966,7 +1966,7 @@
</span><span class="cx">         // Find our enclosingLayer and add ourselves.
</span><span class="cx">         RenderLayer* parentLayer = renderer().parent()-&gt;enclosingLayer();
</span><span class="cx">         ASSERT(parentLayer);
</span><del>-        RenderLayer* beforeChild = parentLayer-&gt;reflectionLayer() != this ? renderer().parent()-&gt;findNextLayer(parentLayer, &amp;renderer()) : 0;
</del><ins>+        RenderLayer* beforeChild = parentLayer-&gt;reflectionLayer() != this ? renderer().parent()-&gt;findNextLayer(parentLayer, &amp;renderer()) : nullptr;
</ins><span class="cx">         parentLayer-&gt;addChild(this, beforeChild);
</span><span class="cx">     }
</span><span class="cx"> 
</span><span class="lines">@@ -1993,7 +1993,7 @@
</span><span class="cx">     EPosition position = renderer.style().position();
</span><span class="cx"> 
</span><span class="cx">     // FIXME: Special casing RenderFlowThread so much for fixed positioning here is not great.
</span><del>-    RenderFlowThread* fixedFlowThreadContainer = position == FixedPosition ? renderer.flowThreadContainingBlock() : 0;
</del><ins>+    RenderFlowThread* fixedFlowThreadContainer = position == FixedPosition ? renderer.flowThreadContainingBlock() : nullptr;
</ins><span class="cx">     if (fixedFlowThreadContainer &amp;&amp; !fixedFlowThreadContainer-&gt;isOutOfFlowPositioned())
</span><span class="cx">         fixedFlowThreadContainer = nullptr;
</span><span class="cx"> 
</span><span class="lines">@@ -2096,7 +2096,7 @@
</span><span class="cx">         parentLayer = layer-&gt;parent();
</span><span class="cx">     
</span><span class="cx">     if (!parentLayer)
</span><del>-        return 0;
</del><ins>+        return nullptr;
</ins><span class="cx"> 
</span><span class="cx">     location += toLayoutSize(layer-&gt;location());
</span><span class="cx"> 
</span><span class="lines">@@ -3163,7 +3163,7 @@
</span><span class="cx"> 
</span><span class="cx">     // FIXME: We should return the frame view here (or possibly an ancestor frame view,
</span><span class="cx">     // if the frame view isn't scrollable.
</span><del>-    return 0;
</del><ins>+    return nullptr;
</ins><span class="cx"> }
</span><span class="cx"> 
</span><span class="cx"> bool RenderLayer::isScrollableOrRubberbandable()
</span><span class="lines">@@ -4417,11 +4417,11 @@
</span><span class="cx">         return paginationLayer;
</span><span class="cx">     
</span><span class="cx">     // Walk up the layer tree and see which layer we hit first. If it's the root, then the enclosing pagination
</span><del>-    // layer isn't in our subtree and we return 0. If we hit the enclosing pagination layer first, then
</del><ins>+    // layer isn't in our subtree and we return nullptr. If we hit the enclosing pagination layer first, then
</ins><span class="cx">     // we can return it.
</span><span class="cx">     for (const RenderLayer* layer = this; layer; layer = layer-&gt;parent()) {
</span><span class="cx">         if (layer == rootLayer)
</span><del>-            return 0;
</del><ins>+            return nullptr;
</ins><span class="cx">         if (layer == paginationLayer)
</span><span class="cx">             return paginationLayer;
</span><span class="cx">     }
</span><span class="lines">@@ -4429,7 +4429,7 @@
</span><span class="cx">     // This should never be reached, since an enclosing layer should always either be the rootLayer or be
</span><span class="cx">     // our enclosing pagination layer.
</span><span class="cx">     ASSERT_NOT_REACHED();
</span><del>-    return 0;
</del><ins>+    return nullptr;
</ins><span class="cx"> }
</span><span class="cx"> 
</span><span class="cx"> void RenderLayer::collectFragments(LayerFragments&amp; fragments, const RenderLayer* rootLayer, const LayoutRect&amp; dirtyRect, PaginationInclusionMode inclusionMode,
</span><span class="lines">@@ -4825,7 +4825,7 @@
</span><span class="cx">         if (Element* e = r-&gt;element())
</span><span class="cx">             return e;
</span><span class="cx">     }
</span><del>-    return 0;
</del><ins>+    return nullptr;
</ins><span class="cx"> }
</span><span class="cx"> 
</span><span class="cx"> RenderLayer* RenderLayer::enclosingFlowThreadAncestor() const
</span><span class="lines">@@ -4834,7 +4834,7 @@
</span><span class="cx">     for (; curr &amp;&amp; !curr-&gt;isRenderFlowThread(); curr = curr-&gt;parent()) {
</span><span class="cx">         if (curr-&gt;isStackingContainer() &amp;&amp; curr-&gt;isComposited()) {
</span><span class="cx">             // We only adjust the position of the first level of layers.
</span><del>-            return 0;
</del><ins>+            return nullptr;
</ins><span class="cx">         }
</span><span class="cx">     }
</span><span class="cx">     return curr;
</span><span class="lines">@@ -4932,11 +4932,11 @@
</span><span class="cx">     bool depthSortDescendants)
</span><span class="cx"> {
</span><span class="cx">     if (!isRootLayer())
</span><del>-        return 0;
</del><ins>+        return nullptr;
</ins><span class="cx"> 
</span><span class="cx">     // Get the named flows for the view
</span><span class="cx">     if (!renderer().view().hasRenderNamedFlowThreads())
</span><del>-        return 0;
</del><ins>+        return nullptr;
</ins><span class="cx"> 
</span><span class="cx">     Vector&lt;RenderLayer*&gt; fixedLayers;
</span><span class="cx">     renderer().view().flowThreadController().collectFixedPositionedLayers(fixedLayers);
</span><span class="lines">@@ -4980,13 +4980,13 @@
</span><span class="cx">                                        const HitTestingTransformState* transformState, double* zOffset)
</span><span class="cx"> {
</span><span class="cx">     if (!isSelfPaintingLayer() &amp;&amp; !hasSelfPaintingLayerDescendant())
</span><del>-        return 0;
</del><ins>+        return nullptr;
</ins><span class="cx"> 
</span><span class="cx">     RenderNamedFlowFragment* namedFlowFragment = currentRenderNamedFlowFragment();
</span><span class="cx"> 
</span><span class="cx">     // Prevent hitting the fixed layers inside the flow thread when hitting through regions.
</span><span class="cx">     if (renderer().fixedPositionedWithNamedFlowContainingBlock() &amp;&amp; namedFlowFragment)
</span><del>-        return 0;
</del><ins>+        return nullptr;
</ins><span class="cx"> 
</span><span class="cx">     // Don't hit-test the layer if the renderer doesn't belong to this region.
</span><span class="cx">     // This is true as long as we clamp the range of a box to its containing block range.
</span><span class="lines">@@ -4995,7 +4995,7 @@
</span><span class="cx">         ASSERT(namedFlowFragment-&gt;isValid());
</span><span class="cx">         RenderFlowThread* flowThread = namedFlowFragment-&gt;flowThread();
</span><span class="cx">         if (!flowThread-&gt;objectShouldFragmentInFlowRegion(&amp;renderer(), namedFlowFragment))
</span><del>-            return 0;
</del><ins>+            return nullptr;
</ins><span class="cx">     }
</span><span class="cx"> 
</span><span class="cx">     // The natural thing would be to keep HitTestingTransformState on the stack, but it's big, so we heap-allocate.
</span><span class="lines">@@ -5011,7 +5011,7 @@
</span><span class="cx">             ClipRect clipRect = backgroundClipRect(clipRectsContext);
</span><span class="cx">             // Go ahead and test the enclosing clip now.
</span><span class="cx">             if (!clipRect.intersects(hitTestLocation))
</span><del>-                return 0;
</del><ins>+                return nullptr;
</ins><span class="cx">         }
</span><span class="cx"> 
</span><span class="cx">         return hitTestLayerByApplyingTransform(rootLayer, containerLayer, request, result, hitTestRect, hitTestLocation, transformState, zOffset);
</span><span class="lines">@@ -5036,7 +5036,7 @@
</span><span class="cx">         TransformationMatrix invertedMatrix = localTransformState-&gt;m_accumulatedTransform.inverse();
</span><span class="cx">         // If the z-vector of the matrix is negative, the back is facing towards the viewer.
</span><span class="cx">         if (invertedMatrix.m33() &lt; 0)
</span><del>-            return 0;
</del><ins>+            return nullptr;
</ins><span class="cx">     }
</span><span class="cx"> 
</span><span class="cx">     RefPtr&lt;HitTestingTransformState&gt; unflattenedTransformState = localTransformState;
</span><span class="lines">@@ -5161,7 +5161,7 @@
</span><span class="cx">             result.append(tempResult);
</span><span class="cx">     }
</span><span class="cx"> 
</span><del>-    return 0;
</del><ins>+    return nullptr;
</ins><span class="cx"> }
</span><span class="cx"> 
</span><span class="cx"> bool RenderLayer::hitTestContentsForFragments(const LayerFragments&amp; layerFragments, const HitTestRequest&amp; request, HitTestResult&amp; result,
</span><span class="lines">@@ -5233,7 +5233,7 @@
</span><span class="cx">             return hitLayer;
</span><span class="cx">     }
</span><span class="cx">     
</span><del>-    return 0;
</del><ins>+    return nullptr;
</ins><span class="cx"> }
</span><span class="cx"> 
</span><span class="cx"> RenderLayer* RenderLayer::hitTestLayerByApplyingTransform(RenderLayer* rootLayer, RenderLayer* containerLayer, const HitTestRequest&amp; request, HitTestResult&amp; result,
</span><span class="lines">@@ -5245,7 +5245,7 @@
</span><span class="cx"> 
</span><span class="cx">     // If the transform can't be inverted, then don't hit test this layer at all.
</span><span class="cx">     if (!newTransformState-&gt;m_accumulatedTransform.isInvertible())
</span><del>-        return 0;
</del><ins>+        return nullptr;
</ins><span class="cx"> 
</span><span class="cx">     // Compute the point and the hit test rect in the coords of this layer by using the values
</span><span class="cx">     // from the transformState, which store the point and quad in the coords of the last flattened
</span><span class="lines">@@ -5308,10 +5308,10 @@
</span><span class="cx">                                       bool depthSortDescendants)
</span><span class="cx"> {
</span><span class="cx">     if (!list)
</span><del>-        return 0;
</del><ins>+        return nullptr;
</ins><span class="cx"> 
</span><span class="cx">     if (!hasSelfPaintingLayerDescendant())
</span><del>-        return 0;
</del><ins>+        return nullptr;
</ins><span class="cx"> 
</span><span class="cx">     RenderLayer* resultLayer = nullptr;
</span><span class="cx">     for (int i = list-&gt;size() - 1; i &gt;= 0; --i) {
</span><span class="lines">@@ -5360,7 +5360,7 @@
</span><span class="cx">     
</span><span class="cx">     // For transformed layers, the root layer was shifted to be us, so there is no need to
</span><span class="cx">     // examine the parent.  We want to cache clip rects with us as the root.
</span><del>-    RenderLayer* parentLayer = clipRectsContext.rootLayer != this ? parent() : 0;
</del><ins>+    RenderLayer* parentLayer = clipRectsContext.rootLayer != this ? parent() : nullptr;
</ins><span class="cx">     if (parentLayer)
</span><span class="cx">         parentLayer-&gt;updateClipRects(clipRectsContext);
</span><span class="cx"> 
</span><span class="lines">@@ -5416,7 +5416,7 @@
</span><span class="cx"> ClipRects* RenderLayer::clipRects(const ClipRectsContext&amp; context) const
</span><span class="cx"> {
</span><span class="cx">     ASSERT(context.clipRectsType &lt; NumCachedClipRectsTypes);
</span><del>-    return m_clipRectsCache ? m_clipRectsCache-&gt;getClipRects(context.clipRectsType, context.respectOverflowClip).get() : 0;
</del><ins>+    return m_clipRectsCache ? m_clipRectsCache-&gt;getClipRects(context.clipRectsType, context.respectOverflowClip).get() : nullptr;
</ins><span class="cx"> }
</span><span class="cx"> 
</span><span class="cx"> void RenderLayer::calculateClipRects(const ClipRectsContext&amp; clipRectsContext, ClipRects&amp; clipRects) const
</span><span class="lines">@@ -5435,7 +5435,7 @@
</span><span class="cx"> 
</span><span class="cx">     // For transformed layers, the root layer was shifted to be us, so there is no need to
</span><span class="cx">     // examine the parent. We want to cache clip rects with us as the root.
</span><del>-    RenderLayer* parentLayer = clipRectsContext.rootLayer != this ? parent() : 0;
</del><ins>+    RenderLayer* parentLayer = clipRectsContext.rootLayer != this ? parent() : nullptr;
</ins><span class="cx">     
</span><span class="cx">     // Ensure that our parent's clip has been calculated so that we can examine the values.
</span><span class="cx">     if (parentLayer) {
</span><span class="lines">@@ -6046,22 +6046,22 @@
</span><span class="cx"> 
</span><span class="cx"> GraphicsLayer* RenderLayer::layerForScrolling() const
</span><span class="cx"> {
</span><del>-    return m_backing ? m_backing-&gt;scrollingContentsLayer() : 0;
</del><ins>+    return m_backing ? m_backing-&gt;scrollingContentsLayer() : nullptr;
</ins><span class="cx"> }
</span><span class="cx"> 
</span><span class="cx"> GraphicsLayer* RenderLayer::layerForHorizontalScrollbar() const
</span><span class="cx"> {
</span><del>-    return m_backing ? m_backing-&gt;layerForHorizontalScrollbar() : 0;
</del><ins>+    return m_backing ? m_backing-&gt;layerForHorizontalScrollbar() : nullptr;
</ins><span class="cx"> }
</span><span class="cx"> 
</span><span class="cx"> GraphicsLayer* RenderLayer::layerForVerticalScrollbar() const
</span><span class="cx"> {
</span><del>-    return m_backing ? m_backing-&gt;layerForVerticalScrollbar() : 0;
</del><ins>+    return m_backing ? m_backing-&gt;layerForVerticalScrollbar() : nullptr;
</ins><span class="cx"> }
</span><span class="cx"> 
</span><span class="cx"> GraphicsLayer* RenderLayer::layerForScrollCorner() const
</span><span class="cx"> {
</span><del>-    return m_backing ? m_backing-&gt;layerForScrollCorner() : 0;
</del><ins>+    return m_backing ? m_backing-&gt;layerForScrollCorner() : nullptr;
</ins><span class="cx"> }
</span><span class="cx"> 
</span><span class="cx"> bool RenderLayer::paintsWithTransform(PaintBehavior paintBehavior) const
</span><span class="lines">@@ -6759,7 +6759,7 @@
</span><span class="cx"> void RenderLayer::updateScrollCornerStyle()
</span><span class="cx"> {
</span><span class="cx">     RenderElement* actualRenderer = rendererForScrollbar(renderer());
</span><del>-    RefPtr&lt;RenderStyle&gt; corner = renderer().hasOverflowClip() ? actualRenderer-&gt;getUncachedPseudoStyle(PseudoStyleRequest(SCROLLBAR_CORNER), &amp;actualRenderer-&gt;style()) : PassRefPtr&lt;RenderStyle&gt;(0);
</del><ins>+    RefPtr&lt;RenderStyle&gt; corner = renderer().hasOverflowClip() ? actualRenderer-&gt;getUncachedPseudoStyle(PseudoStyleRequest(SCROLLBAR_CORNER), &amp;actualRenderer-&gt;style()) : nullptr;
</ins><span class="cx"> 
</span><span class="cx">     if (!corner) {
</span><span class="cx">         m_scrollCorner = nullptr;
</span><span class="lines">@@ -6777,7 +6777,7 @@
</span><span class="cx"> void RenderLayer::updateResizerStyle()
</span><span class="cx"> {
</span><span class="cx">     RenderElement* actualRenderer = rendererForScrollbar(renderer());
</span><del>-    RefPtr&lt;RenderStyle&gt; resizer = renderer().hasOverflowClip() ? actualRenderer-&gt;getUncachedPseudoStyle(PseudoStyleRequest(RESIZER), &amp;actualRenderer-&gt;style()) : PassRefPtr&lt;RenderStyle&gt;(0);
</del><ins>+    RefPtr&lt;RenderStyle&gt; resizer = renderer().hasOverflowClip() ? actualRenderer-&gt;getUncachedPseudoStyle(PseudoStyleRequest(RESIZER), &amp;actualRenderer-&gt;style()) : nullptr;
</ins><span class="cx"> 
</span><span class="cx">     if (!resizer) {
</span><span class="cx">         m_resizer = nullptr;
</span><span class="lines">@@ -6794,7 +6794,7 @@
</span><span class="cx"> 
</span><span class="cx"> RenderLayer* RenderLayer::reflectionLayer() const
</span><span class="cx"> {
</span><del>-    return m_reflection ? m_reflection-&gt;layer() : 0;
</del><ins>+    return m_reflection ? m_reflection-&gt;layer() : nullptr;
</ins><span class="cx"> }
</span><span class="cx"> 
</span><span class="cx"> void RenderLayer::createReflection()
</span><span class="lines">@@ -6810,7 +6810,7 @@
</span><span class="cx">     if (!m_reflection-&gt;documentBeingDestroyed())
</span><span class="cx">         m_reflection-&gt;removeLayers(this);
</span><span class="cx"> 
</span><del>-    m_reflection-&gt;setParent(0);
</del><ins>+    m_reflection-&gt;setParent(nullptr);
</ins><span class="cx">     m_reflection = nullptr;
</span><span class="cx"> }
</span><span class="cx"> 
</span></span></pre>
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