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diff --git a/src/api/studio3d/q3dssurfaceviewer_p.h b/src/api/studio3d/q3dssurfaceviewer_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt 3D Studio.
+**
+** $QT_BEGIN_LICENSE:GPL$
+** 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 General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 or (at your option) 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.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-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef Q3DSSURFACEVIEWER_P_H
+#define Q3DSSURFACEVIEWER_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the QtStudio3D API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "q3dssurfaceviewer.h"
+#include "Qt3DSViewerApp.h"
+
+#include <QtCore/qtimer.h>
+
+QT_BEGIN_NAMESPACE
+
+class QSurface;
+class QOpenGLContext;
+class Q3DSViewerSettings;
+class Q3DSPresentation;
+class QQmlEngine;
+
+class Q_STUDIO3D_EXPORT Q3DSSurfaceViewerPrivate : public QObject
+{
+    Q_OBJECT
+    Q_DECLARE_PUBLIC(Q3DSSurfaceViewer)
+public:
+    explicit Q3DSSurfaceViewerPrivate(Q3DSSurfaceViewer *parent = nullptr);
+    ~Q3DSSurfaceViewerPrivate();
+
+    void setSize(const QSize &size);
+    void setUpdateInterval(int interval);
+    bool initialize(QSurface *surface, QOpenGLContext *context, GLuint fboId, bool idValid);
+    void update();
+
+    QImage grab(const QRect &rect);
+
+private Q_SLOTS:
+    void destroy();
+
+protected:
+    bool eventFilter(QObject *obj, QEvent *e) override;
+
+private:
+    void reset();
+    void setError(const QString &error);
+    bool initializeRuntime();
+    void releaseRuntime();
+    void resetUpdateTimer();
+    QObject *surfaceObject();
+
+    Q3DSSurfaceViewer *q_ptr;
+
+    Q3DSViewer::Q3DSViewerApp *m_viewerApp;
+    QSize m_size;
+    QTimer *m_timer;
+    int m_updateInterval;
+    qreal m_pixelRatio;
+    GLuint m_fboId;
+    QSurface *m_surface; // Not owned
+    QOpenGLContext *m_context; // Not owned
+    bool m_autoSize;
+    Q3DSViewerSettings *m_settings;
+    Q3DSPresentation *m_presentation;
+    QString m_id;
+    QElapsedTimer m_startupTimer;
+    QQmlEngine *qmlEngine = nullptr;
+    QString m_error;
+};
+
+QT_END_NAMESPACE
+
+#endif // Q3DSSURFACEVIEWER_P_H