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+/****************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtWebEngine module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "compositor.h"
+
+#include "delegated_frame_node.h"
+
+#include <components/viz/common/resources/returned_resource.h>
+#include <content/public/browser/browser_thread.h>
+#include <services/viz/public/interfaces/compositing/compositor_frame_sink.mojom.h>
+
+namespace QtWebEngineCore {
+
+Compositor::Compositor()
+ : m_chromiumCompositorData(new ChromiumCompositorData)
+{
+ DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+
+ base::SingleThreadTaskRunner *taskRunner =
+ content::BrowserThread::GetTaskRunnerForThread(content::BrowserThread::UI).get();
+ m_beginFrameSource =
+ std::make_unique<viz::DelayBasedBeginFrameSource>(
+ std::make_unique<viz::DelayBasedTimeSource>(taskRunner),
+ viz::BeginFrameSource::kNotRestartableId);
+}
+
+Compositor::~Compositor()
+{
+ DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+}
+
+void Compositor::setViewDelegate(RenderWidgetHostViewQtDelegate *viewDelegate)
+{
+ DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+
+ m_viewDelegate = viewDelegate;
+}
+
+void Compositor::setFrameSinkClient(viz::mojom::CompositorFrameSinkClient *frameSinkClient)
+{
+ DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+
+ if (m_frameSinkClient == frameSinkClient)
+ return;
+
+ // Accumulated resources belong to the old RendererCompositorFrameSink and
+ // should not be returned.
+ //
+ // TODO(juvaldma): Can there be a pending frame from the old client?
+ m_resourcesToRelease.clear();
+ m_frameSinkClient = frameSinkClient;
+}
+
+void Compositor::setNeedsBeginFrames(bool needsBeginFrames)
+{
+ DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+
+ if (m_needsBeginFrames == needsBeginFrames)
+ return;
+
+ if (needsBeginFrames)
+ m_beginFrameSource->AddObserver(this);
+ else
+ m_beginFrameSource->RemoveObserver(this);
+
+ m_needsBeginFrames = needsBeginFrames;
+}
+
+void Compositor::submitFrame(viz::CompositorFrame frame)
+{
+ DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+ DCHECK(!m_havePendingFrame);
+
+ m_chromiumCompositorData->frameDevicePixelRatio = frame.metadata.device_scale_factor;
+ m_chromiumCompositorData->previousFrameData = std::move(m_chromiumCompositorData->frameData);
+ m_chromiumCompositorData->frameData = std::move(frame);
+ m_havePendingFrame = true;
+
+ // Tell viewDelegate to call updatePaintNode() soon.
+ m_viewDelegate->update();
+}
+
+QSGNode *Compositor::updatePaintNode(QSGNode *oldNode)
+{
+ // DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+ //
+ // This might be called from a Qt Quick render thread, but the UI thread
+ // will still be blocked for the duration of this call.
+
+ DelegatedFrameNode *frameNode = static_cast<DelegatedFrameNode *>(oldNode);
+ if (!frameNode)
+ frameNode = new DelegatedFrameNode;
+
+ frameNode->commit(m_chromiumCompositorData.data(), &m_resourcesToRelease, m_viewDelegate);
+
+ if (m_havePendingFrame) {
+ m_havePendingFrame = false;
+ content::BrowserThread::PostTask(
+ content::BrowserThread::UI, FROM_HERE,
+ base::BindOnce(&Compositor::notifyFrameCommitted, m_weakPtrFactory.GetWeakPtr()));
+ }
+
+ return frameNode;
+}
+
+void Compositor::notifyFrameCommitted()
+{
+ DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+
+ m_beginFrameSource->DidFinishFrame(this);
+ if (m_frameSinkClient)
+ m_frameSinkClient->DidReceiveCompositorFrameAck(m_resourcesToRelease);
+ m_resourcesToRelease.clear();
+}
+
+bool Compositor::OnBeginFrameDerivedImpl(const viz::BeginFrameArgs &args)
+{
+ DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+
+ m_beginFrameSource->OnUpdateVSyncParameters(args.frame_time, args.interval);
+ if (m_frameSinkClient)
+ m_frameSinkClient->OnBeginFrame(args);
+
+ return true;
+}
+
+void Compositor::OnBeginFrameSourcePausedChanged(bool)
+{
+ // Ignored for now. If the begin frame source is paused, the renderer
+ // doesn't need to be informed about it and will just not receive more
+ // begin frames.
+}
+
+} // namespace QtWebEngineCore