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

/*
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 * modification, are permitted provided that the following conditions are
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 * this software without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#include "core/layout/SubtreeLayoutScope.h"

#include "core/frame/FrameView.h"
#include "core/layout/LayoutObject.h"

namespace blink {

SubtreeLayoutScope::SubtreeLayoutScope(LayoutObject& root) : m_root(root) {
  RELEASE_ASSERT(m_root.document().view()->isInPerformLayout());
}

SubtreeLayoutScope::~SubtreeLayoutScope() {
  RELEASE_ASSERT(!m_root.needsLayout());

#if DCHECK_IS_ON()
  for (auto* layoutObject : m_layoutObjectsToLayout)
    layoutObject->assertLaidOut();
#endif
}

void SubtreeLayoutScope::setNeedsLayout(
    LayoutObject* descendant,
    LayoutInvalidationReasonForTracing reason) {
  ASSERT(descendant->isDescendantOf(&m_root));
  descendant->setNeedsLayout(reason, MarkContainerChain, this);
}

void SubtreeLayoutScope::setChildNeedsLayout(LayoutObject* descendant) {
  ASSERT(descendant->isDescendantOf(&m_root));
  descendant->setChildNeedsLayout(MarkContainerChain, this);
}

void SubtreeLayoutScope::recordObjectMarkedForLayout(
    LayoutObject* layoutObject) {
#if DCHECK_IS_ON()
  m_layoutObjectsToLayout.insert(layoutObject);
#endif
}

}  // namespace blink