Blink-side contiguous allocation of display items.

Source/core/paint/BoxClipper.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/BoxClipper.h"
 
 #include "core/layout/LayoutBox.h"
 #include "core/paint/DeprecatedPaintLayer.h"
 #include "core/paint/PaintInfo.h"
@@ skipping 41 matching lines @@
 
     if (RuntimeEnabledFeatures::slimmingPaintEnabled()) {
         ASSERT(m_paintInfo.context->displayItemList());
         if (!m_paintInfo.context->displayItemList()->displayItemConstructionIsDisabled()) {
             m_clipType = m_paintInfo.displayItemTypeForClipping();
             OwnPtr<Vector<FloatRoundedRect>> roundedRects;
             if (hasBorderRadius) {
                 roundedRects = adoptPtr(new Vector<FloatRoundedRect>());
                 roundedRects->append(clipRoundedRect);
             }
-            OwnPtr<ClipDisplayItem> clipDisplayItem = ClipDisplayItem::create(m_box, m_clipType, pixelSnappedIntRect(clipRect), roundedRects.release());
-            m_paintInfo.context->displayItemList()->add(clipDisplayItem.release());
+            m_paintInfo.context->displayItemList()->createAndAppend<ClipDisplayItem>(m_box, m_clipType, pixelSnappedIntRect(clipRect), roundedRects.release());
         }
     } else {
         m_clipType = m_paintInfo.displayItemTypeForClipping();
         OwnPtr<Vector<FloatRoundedRect>> roundedRects;
         if (hasBorderRadius) {
             roundedRects = adoptPtr(new Vector<FloatRoundedRect>());
             roundedRects->append(clipRoundedRect);
         }
-        OwnPtr<ClipDisplayItem> clipDisplayItem = ClipDisplayItem::create(m_box, m_clipType, pixelSnappedIntRect(clipRect), roundedRects.release());
-        clipDisplayItem->replay(*paintInfo.context);
+        ClipDisplayItem clipDisplayItem(m_box, m_clipType, pixelSnappedIntRect(clipRect), roundedRects.release());
+        clipDisplayItem.replay(*paintInfo.context);
     }
 }
 
 BoxClipper::~BoxClipper()
 {
     if (m_clipType == DisplayItem::UninitializedType)
         return;
 
     ASSERT(m_box.hasControlClip() || (m_box.hasOverflowClip() && !m_box.layer()->isSelfPaintingLayer()));
 
     if (RuntimeEnabledFeatures::slimmingPaintEnabled()) {
         ASSERT(m_paintInfo.context->displayItemList());
         if (!m_paintInfo.context->displayItemList()->displayItemConstructionIsDisabled()) {
             if (m_paintInfo.context->displayItemList()->lastDisplayItemIsNoopBegin())
                 m_paintInfo.context->displayItemList()->removeLastDisplayItem();
             else
-                m_paintInfo.context->displayItemList()->add(EndClipDisplayItem::create(m_box, DisplayItem::clipTypeToEndClipType(m_clipType)));
+                m_paintInfo.context->displayItemList()->createAndAppend<EndClipDisplayItem>(m_box, DisplayItem::clipTypeToEndClipType(m_clipType));
         }
     } else {
         EndClipDisplayItem endClipDisplayItem(m_box, DisplayItem::clipTypeToEndClipType(m_clipType));
         endClipDisplayItem.replay(*m_paintInfo.context);
     }
 }
 
 } // namespace blink