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/*
* Copyright (c) 2024 Igalia S.L.
*
* 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
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#pragma once
#include "RenderElement.h"
#include <wtf/WeakHashSet.h>
#include <wtf/WeakPtr.h>
namespace WebCore {
class SVGVisitedRendererTracking {
public:
using VisitedSet = SingleThreadWeakHashSet<RenderElement>;
SVGVisitedRendererTracking(VisitedSet& visitedSet)
: m_visitedRenderers(visitedSet)
{
}
~SVGVisitedRendererTracking() = default;
bool isEmpty() const { return m_visitedRenderers.isEmptyIgnoringNullReferences(); }
bool isVisiting(const RenderElement& renderer) { return m_visitedRenderers.contains(renderer); }
class Scope {
public:
Scope(SVGVisitedRendererTracking& tracking, const RenderElement& renderer)
: m_tracking(tracking)
, m_renderer(renderer)
{
m_tracking.addUnique(renderer);
}
~Scope()
{
if (m_renderer)
m_tracking.removeUnique(*m_renderer);
}
private:
SVGVisitedRendererTracking& m_tracking;
SingleThreadWeakPtr<RenderElement> m_renderer;
};
private:
friend class Scope;
void addUnique(const RenderElement& renderer)
{
auto result = m_visitedRenderers.add(renderer);
ASSERT_UNUSED(result, result.isNewEntry);
}
void removeUnique(const RenderElement& renderer)
{
bool result = m_visitedRenderers.remove(renderer);
ASSERT_UNUSED(result, result);
}
VisitedSet& m_visitedRenderers;
};
}; // namespace WebCore
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