[Slimming Paint] Blink-side contiguous allocation of display items.

Source/core/paint/RoundedInnerRectClipper.cpp

 // Copyright 2015 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/RoundedInnerRectClipper.h"
 
 #include "core/layout/LayoutBox.h"
 #include "core/paint/PaintInfo.h"
 #include "platform/graphics/paint/ClipDisplayItem.h"
 #include "platform/graphics/paint/DisplayItemList.h"
 
 namespace blink {
 
 RoundedInnerRectClipper::RoundedInnerRectClipper(LayoutObject& layoutObject, const PaintInfo& paintInfo, const LayoutRect& rect, const FloatRoundedRect& clipRect, RoundedInnerRectClipperBehavior behavior)
     : m_layoutObject(layoutObject)
     , m_paintInfo(paintInfo)
     , m_useDisplayItemList(RuntimeEnabledFeatures::slimmingPaintEnabled() && behavior == ApplyToDisplayListIfEnabled)
     , m_clipType(m_useDisplayItemList ? m_paintInfo.displayItemTypeForClipping() : DisplayItem::ClipBoxPaintPhaseFirst)
 {
-    OwnPtr<ClipDisplayItem> clipDisplayItem = ClipDisplayItem::create(layoutObject, m_clipType, LayoutRect::infiniteIntRect());
+    ClipDisplayItem clipDisplayItem(layoutObject, m_clipType, LayoutRect::infiniteIntRect());
 
     if (clipRect.isRenderable()) {
-        clipDisplayItem->roundedRectClips().append(clipRect);
+        clipDisplayItem.roundedRectClips().append(clipRect);
     } else {
         // We create a rounded rect for each of the corners and clip it, while making sure we clip opposing corners together.
         if (!clipRect.radii().topLeft().isEmpty() || !clipRect.radii().bottomRight().isEmpty()) {
             FloatRect topCorner(clipRect.rect().x(), clipRect.rect().y(), rect.maxX() - clipRect.rect().x(), rect.maxY() - clipRect.rect().y());
             FloatRoundedRect::Radii topCornerRadii;
             topCornerRadii.setTopLeft(clipRect.radii().topLeft());
-            clipDisplayItem->roundedRectClips().append(FloatRoundedRect(topCorner, topCornerRadii));
+            clipDisplayItem.roundedRectClips().append(FloatRoundedRect(topCorner, topCornerRadii));
 
             FloatRect bottomCorner(rect.x().toFloat(), rect.y().toFloat(), clipRect.rect().maxX() - rect.x().toFloat(), clipRect.rect().maxY() - rect.y().toFloat());
             FloatRoundedRect::Radii bottomCornerRadii;
             bottomCornerRadii.setBottomRight(clipRect.radii().bottomRight());
-            clipDisplayItem->roundedRectClips().append(FloatRoundedRect(bottomCorner, bottomCornerRadii));
+            clipDisplayItem.roundedRectClips().append(FloatRoundedRect(bottomCorner, bottomCornerRadii));
         }
 
         if (!clipRect.radii().topRight().isEmpty() || !clipRect.radii().bottomLeft().isEmpty()) {
             FloatRect topCorner(rect.x().toFloat(), clipRect.rect().y(), clipRect.rect().maxX() - rect.x().toFloat(), rect.maxY() - clipRect.rect().y());
             FloatRoundedRect::Radii topCornerRadii;
             topCornerRadii.setTopRight(clipRect.radii().topRight());
-            clipDisplayItem->roundedRectClips().append(FloatRoundedRect(topCorner, topCornerRadii));
+            clipDisplayItem.roundedRectClips().append(FloatRoundedRect(topCorner, topCornerRadii));
 
             FloatRect bottomCorner(clipRect.rect().x(), rect.y().toFloat(), rect.maxX() - clipRect.rect().x(), clipRect.rect().maxY() - rect.y().toFloat());
             FloatRoundedRect::Radii bottomCornerRadii;
             bottomCornerRadii.setBottomLeft(clipRect.radii().bottomLeft());
-            clipDisplayItem->roundedRectClips().append(FloatRoundedRect(bottomCorner, bottomCornerRadii));
+            clipDisplayItem.roundedRectClips().append(FloatRoundedRect(bottomCorner, bottomCornerRadii));
         }
     }
 
     if (m_useDisplayItemList) {
         ASSERT(m_paintInfo.context->displayItemList());
         if (m_paintInfo.context->displayItemList()->displayItemConstructionIsDisabled())
             return;
-        m_paintInfo.context->displayItemList()->add(clipDisplayItem.release());
+        m_paintInfo.context->displayItemList()->add(clipDisplayItem);
     } else {
-        clipDisplayItem->replay(*paintInfo.context);
+        clipDisplayItem.replay(*paintInfo.context);
     }
 }
 
 RoundedInnerRectClipper::~RoundedInnerRectClipper()
 {
     DisplayItem::Type endType = DisplayItem::clipTypeToEndClipType(m_clipType);
+    EndClipDisplayItem endClipDisplayItem(m_layoutObject, endType);
     if (m_useDisplayItemList) {
         ASSERT(m_paintInfo.context->displayItemList());
         if (m_paintInfo.context->displayItemList()->displayItemConstructionIsDisabled())
             return;
-        OwnPtr<EndClipDisplayItem> endClipDisplayItem = EndClipDisplayItem::create(m_layoutObject, endType);
-        m_paintInfo.context->displayItemList()->add(endClipDisplayItem.release());
+        m_paintInfo.context->displayItemList()->add(endClipDisplayItem);
     } else {
-        EndClipDisplayItem endClipDisplayItem(m_layoutObject, endType);
         endClipDisplayItem.replay(*m_paintInfo.context);
     }
 }
 
 } // namespace blink