Subtree caching implementation in blink-core

Source/core/layout/LayoutBlock.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 350 matching lines @@
         startOfContinuations = inlineElementContinuation->node()->layoutObject();
     } else if (LayoutObject* firstChild = block.firstChild()) {
         // This block is the anonymous containing block of an inline element continuation.
         if (firstChild->isElementContinuation())
             startOfContinuations = firstChild->node()->layoutObject();
     }
     if (startOfContinuations && startOfContinuations->styleRef().outlineStyleIsAuto())
         startOfContinuations->invalidateDisplayItemClient(*startOfContinuations);
 }
 
-void LayoutBlock::invalidateDisplayItemClients(const LayoutBoxModelObject& paintInvalidationContainer) const
+void LayoutBlock::invalidateDisplayItemClients(const LayoutBoxModelObject& paintInvalidationContainer)
 {
     LayoutBox::invalidateDisplayItemClients(paintInvalidationContainer);
     ASSERT(RuntimeEnabledFeatures::slimmingPaintEnabled());
     invalidateDisplayItemClientForStartOfContinuationsIfNeeded(*this);
 }
 
+bool LayoutBlock::clearRepaintFlagsOfSubtrees()
+{
+    bool result = LayoutBox::clearRepaintFlagsOfSubtrees();
+    if (TrackedLayoutBoxListHashSet* positionedObjects = this->positionedObjects()) {
+        for (auto o : *positionedObjects)
+            result &= o->clearRepaintFlagsRecursively();
+    }
+    return result;
+}
+
 void LayoutBlock::addChildIgnoringContinuation(LayoutObject* newChild, LayoutObject* beforeChild)
 {
     if (beforeChild && beforeChild->parent() != this) {
         LayoutObject* beforeChildContainer = beforeChild->parent();
         while (beforeChildContainer->parent() != this)
             beforeChildContainer = beforeChildContainer->parent();
         ASSERT(beforeChildContainer);
 
         if (beforeChildContainer->isAnonymous()) {
             // If the requested beforeChild is not one of our children, then this is because
@@ skipping 2530 matching lines @@
 void LayoutBlock::showLineTreeAndMark(const InlineBox* markedBox1, const char* markedLabel1, const InlineBox* markedBox2, const char* markedLabel2, const LayoutObject* obj) const
 {
     showLayoutObject();
     for (const RootInlineBox* root = firstRootBox(); root; root = root->nextRootBox())
         root->showLineTreeAndMark(markedBox1, markedLabel1, markedBox2, markedLabel2, obj, 1);
 }
 
 #endif
 
 } // namespace blink