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ContentfulPaintChecker.cpp
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53 lines (43 loc) · 1.85 KB
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/*
* Copyright (C) 2020 WikiMedia Inc. 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
* 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.
*
*/
#include "config.h"
#include "ContentfulPaintChecker.h"
#include "GraphicsContext.h"
#include "LocalFrameView.h"
#include "NullGraphicsContext.h"
#include "RenderView.h"
namespace WebCore {
bool ContentfulPaintChecker::qualifiesForContentfulPaint(LocalFrameView& frameView)
{
ASSERT(!frameView.needsLayout());
ASSERT(frameView.renderView());
auto oldPaintBehavior = frameView.paintBehavior();
auto oldEntireContents = frameView.paintsEntireContents();
frameView.setPaintBehavior(PaintBehavior::FlattenCompositingLayers);
frameView.setPaintsEntireContents(true);
NullGraphicsContext checkerContext(NullGraphicsContext::PaintInvalidationReasons::DetectingContentfulPaint);
IntRect documentRect = frameView.renderView()->documentRect();
documentRect.moveBy(frameView.locationOfContents());
frameView.paint(checkerContext, documentRect);
frameView.setPaintsEntireContents(oldEntireContents);
frameView.setPaintBehavior(oldPaintBehavior);
return checkerContext.contentfulPaintDetected();
}
}