Blink-side contiguous allocation of display items.

Source/core/paint/LayerClipRecorder.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/paint/LayerClipRecorder.h"
 
 #include "core/layout/ClipRect.h"
 #include "core/layout/LayoutView.h"
 #include "core/paint/DeprecatedPaintLayer.h"
@@ skipping 12 matching lines @@
     , m_layoutObject(layoutObject)
     , m_clipType(clipType)
 {
     IntRect snappedClipRect = pixelSnappedIntRect(clipRect.rect());
     OwnPtr<Vector<FloatRoundedRect>> roundedRects;
     if (localPaintingInfo && clipRect.hasRadius()) {
         roundedRects = adoptPtr(new Vector<FloatRoundedRect>());
         collectRoundedRectClips(*layoutObject.layer(), *localPaintingInfo, graphicsContext, fragmentOffset, paintFlags, rule, *roundedRects);
     }
 
-    OwnPtr<ClipDisplayItem> clipDisplayItem = ClipDisplayItem::create(layoutObject, clipType, snappedClipRect, roundedRects.release());
-    if (!RuntimeEnabledFeatures::slimmingPaintEnabled()) {
-        clipDisplayItem->replay(graphicsContext);
-    } else {
-        ASSERT(m_graphicsContext.displayItemList());
+    if (RuntimeEnabledFeatures::slimmingPaintEnabled()) {
         if (m_graphicsContext.displayItemList()->displayItemConstructionIsDisabled())
             return;
-        m_graphicsContext.displayItemList()->add(clipDisplayItem.release());
+        m_graphicsContext.displayItemList()->createAndAppend<ClipDisplayItem>(layoutObject, m_clipType, snappedClipRect, roundedRects.release());
+    } else {
+        ClipDisplayItem clipDisplayItem(layoutObject, m_clipType, snappedClipRect, roundedRects.release());
+        clipDisplayItem.replay(graphicsContext);
     }
 }
 
 static bool inContainingBlockChain(DeprecatedPaintLayer* startLayer, DeprecatedPaintLayer* endLayer)
 {
     if (startLayer == endLayer)
         return true;
 
     LayoutView* view = startLayer->layoutObject()->view();
     for (LayoutBlock* currentBlock = startLayer->layoutObject()->containingBlock(); currentBlock && currentBlock != view; currentBlock = currentBlock->containingBlock()) {
@@ skipping 30 matching lines @@
 }
 
 LayerClipRecorder::~LayerClipRecorder()
 {
     if (RuntimeEnabledFeatures::slimmingPaintEnabled()) {
         ASSERT(m_graphicsContext.displayItemList());
         if (!m_graphicsContext.displayItemList()->displayItemConstructionIsDisabled()) {
             if (m_graphicsContext.displayItemList()->lastDisplayItemIsNoopBegin())
                 m_graphicsContext.displayItemList()->removeLastDisplayItem();
             else
-                m_graphicsContext.displayItemList()->add(EndClipDisplayItem::create(m_layoutObject, DisplayItem::clipTypeToEndClipType(m_clipType)));
+                m_graphicsContext.displayItemList()->createAndAppend<EndClipDisplayItem>(m_layoutObject, DisplayItem::clipTypeToEndClipType(m_clipType));
         }
     } else {
         m_graphicsContext.restore();
     }
 }
 
 } // namespace blink