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/*
* Copyright (C) 2020, 2021, 2022 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 "RenderElementInlines.h"
#include "RenderLayerModelObject.h"
#include <wtf/WeakPtr.h>
namespace WebCore {
class SVGLayerTransformUpdater {
WTF_MAKE_NONCOPYABLE(SVGLayerTransformUpdater);
public:
SVGLayerTransformUpdater(RenderLayerModelObject& renderer)
: m_renderer(renderer)
{
if (!m_renderer->hasLayer())
return;
m_transformReferenceBox = m_renderer->transformReferenceBoxRect();
m_layerTransform = m_renderer->layerTransform();
m_renderer->updateLayerTransform();
}
~SVGLayerTransformUpdater()
{
if (!m_renderer->hasLayer())
return;
if (m_renderer->transformReferenceBoxRect() == m_transformReferenceBox)
return;
m_renderer->updateLayerTransform();
}
bool layerTransformChanged() const
{
auto* layerTransform = m_renderer->layerTransform();
bool hasTransform = !!layerTransform;
bool hadTransform = !!m_layerTransform;
if (hasTransform != hadTransform)
return true;
return hasTransform && (*layerTransform != *m_layerTransform);
}
private:
SingleThreadWeakRef<RenderLayerModelObject> m_renderer;
FloatRect m_transformReferenceBox;
TransformationMatrix* m_layerTransform { nullptr };
};
} // namespace WebCore
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