Preliminary paint property walk implementation for SPv2

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

Index: third_party/WebKit/Source/core/layout/LayoutObject.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutObject.cpp b/third_party/WebKit/Source/core/layout/LayoutObject.cpp
index dd976b77bff4aa2411b104588939d6ac91b35734..734f1e7682549ceafcfaf68a4514890a55b8b926 100644
--- a/third_party/WebKit/Source/core/layout/LayoutObject.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutObject.cpp
@@ -74,6 +74,7 @@
 #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"
@@ -148,6 +149,9 @@ 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());
@@ -2513,6 +2517,11 @@ void LayoutObject::willBeDestroyed()
     if (selectionPaintInvalidationMap)
         selectionPaintInvalidationMap->remove(this);
 
+    if (objectPaintPropertiesMap) {
+        ASSERT(RuntimeEnabledFeatures::slimmingPaintV2Enabled());
+        clearObjectPaintProperties();
+    }
+
     clearLayoutRootIfNeeded();
 
     if (m_style) {
@@ -3440,6 +3449,38 @@ void LayoutObject::setIsSlowRepaintObject(bool isSlowRepaintObject)
         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