Preliminary paint property walk implementation for SPv2

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 56 matching lines @@
 #include "core/layout/LayoutScrollbarPart.h"
 #include "core/layout/LayoutTableCaption.h"
 #include "core/layout/LayoutTableCell.h"
 #include "core/layout/LayoutTableCol.h"
 #include "core/layout/LayoutTableRow.h"
 #include "core/layout/LayoutTheme.h"
 #include "core/layout/LayoutView.h"
 #include "core/layout/compositing/PaintLayerCompositor.h"
 #include "core/page/AutoscrollController.h"
 #include "core/page/Page.h"
+#include "core/paint/ObjectPaintProperties.h"
 #include "core/paint/ObjectPainter.h"
 #include "core/paint/PaintInfo.h"
 #include "core/paint/PaintLayer.h"
 #include "core/style/ContentData.h"
 #include "core/style/ShadowList.h"
 #include "platform/HostWindow.h"
 #include "platform/JSONValues.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/TraceEvent.h"
 #include "platform/TracedValue.h"
@@ skipping 54 matching lines @@
     LayoutPoint position; // Stores the previous position from the paint invalidation container.
 };
 
 static_assert(sizeof(LayoutObject) == sizeof(SameSizeAsLayoutObject), "LayoutObject should stay small");
 
 bool LayoutObject::s_affectsParentBlock = false;
 
 typedef HashMap<const LayoutObject*, LayoutRect> SelectionPaintInvalidationMap;
 static SelectionPaintInvalidationMap* selectionPaintInvalidationMap = nullptr;
 
+typedef HashMap<const LayoutObject*, OwnPtr<ObjectPaintProperties>> ObjectPaintPropertiesMap;

[pdr., 2015/10/15 23:50:50]

Please doc what this is for.

+static ObjectPaintPropertiesMap* objectPaintPropertiesMap = nullptr;
+
 void* LayoutObject::operator new(size_t sz)
 {
     ASSERT(isMainThread());
     return partitionAlloc(WTF::Partitions::layoutPartition(), sz);
 }
 
 void LayoutObject::operator delete(void* ptr)
 {
     ASSERT(isMainThread());
     partitionFree(ptr);
@@ skipping 2345 matching lines @@
         EventHandlerRegistry& registry = document().frameHost()->eventHandlerRegistry();
         if (registry.eventHandlerTargets(EventHandlerRegistry::TouchEvent)->contains(node()))
             registry.didRemoveEventHandler(*node(), EventHandlerRegistry::TouchEvent);
     }
 
     setAncestorLineBoxDirty(false);
 
     if (selectionPaintInvalidationMap)
         selectionPaintInvalidationMap->remove(this);
 
+    if (objectPaintPropertiesMap) {
+        ASSERT(RuntimeEnabledFeatures::slimmingPaintV2Enabled());
+        clearObjectPaintProperties();
+    }
+
     clearLayoutRootIfNeeded();
 
     if (m_style) {
         for (const FillLayer* bgLayer = &m_style->backgroundLayers(); bgLayer; bgLayer = bgLayer->next()) {
             if (StyleImage* backgroundImage = bgLayer->image())
                 backgroundImage->removeClient(this);
         }
 
         for (const FillLayer* maskLayer = &m_style->maskLayers(); maskLayer; maskLayer = maskLayer->next()) {
             if (StyleImage* maskImage = maskLayer->image())
@@ skipping 907 matching lines @@
     ASSERT(frameView());
     if (m_bitfields.isSlowRepaintObject() == isSlowRepaintObject)
         return;
     m_bitfields.setIsSlowRepaintObject(isSlowRepaintObject);
     if (isSlowRepaintObject)
         frameView()->addSlowRepaintObject();
     else
         frameView()->removeSlowRepaintObject();
 }
 
+ObjectPaintProperties* LayoutObject::objectPaintProperties() const
+{
+    ASSERT(RuntimeEnabledFeatures::slimmingPaintV2Enabled());
+
+    if (!objectPaintPropertiesMap)
+        return nullptr;
+
+    return objectPaintPropertiesMap->get(this);
+}
+
+ObjectPaintProperties& LayoutObject::ensureObjectPaintProperties()
+{
+    ASSERT(RuntimeEnabledFeatures::slimmingPaintV2Enabled());
+
+    if (ObjectPaintProperties* properties = objectPaintProperties())
+        return *properties;
+
+    if (!objectPaintPropertiesMap)
+        objectPaintPropertiesMap = new ObjectPaintPropertiesMap;
+
+    return *objectPaintPropertiesMap->set(this, ObjectPaintProperties::create()).storedValue->value.get();
+}
+
+void LayoutObject::clearObjectPaintProperties()
+{
+    ASSERT(RuntimeEnabledFeatures::slimmingPaintV2Enabled());
+
+    if (!objectPaintPropertiesMap)
+        return;
+    objectPaintPropertiesMap->remove(this);
+}
+
 } // namespace blink
 
 #ifndef NDEBUG
 
 void showTree(const blink::LayoutObject* object)
 {
     if (object)
         object->showTreeForThis();
     else
         fprintf(stderr, "Cannot showTree. Root is (nil)\n");
@@ skipping 18 matching lines @@
         const blink::LayoutObject* root = object1;
         while (root->parent())
             root = root->parent();
         root->showLayoutTreeAndMark(object1, "*", object2, "-", 0);
     } else {
         fprintf(stderr, "Cannot showLayoutTree. Root is (nil)\n");
     }
 }
 
 #endif