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diff --git a/src/compositor/extensions/qwaylandwlscaler_p.h b/src/compositor/extensions/qwaylandwlscaler_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the QtWaylandCompositor module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** 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 http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://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.LGPLv3 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.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 later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QWAYLANDWLSCALER_P_H
+#define QWAYLANDWLSCALER_P_H
+
+#include "qwaylandwlscaler.h"
+
+#include <QtWaylandCompositor/private/qwaylandcompositorextension_p.h>
+#include <QtWaylandCompositor/private/qwayland-server-scaler.h>
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt 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.
+//
+
+QT_BEGIN_NAMESPACE
+
+class QWaylandSurface;
+
+class Q_WAYLAND_COMPOSITOR_EXPORT QWaylandWlScalerPrivate
+        : public QWaylandCompositorExtensionPrivate
+        , public QtWaylandServer::wl_scaler
+{
+    Q_DECLARE_PUBLIC(QWaylandWlScaler)
+public:
+    explicit QWaylandWlScalerPrivate() = default;
+
+protected:
+    void scaler_destroy(Resource *resource) override;
+    void scaler_get_viewport(Resource *resource, uint32_t id, wl_resource *surface) override;
+
+private:
+    class Viewport : public QtWaylandServer::wl_viewport
+    {
+    public:
+        explicit Viewport(QWaylandSurface *surface, wl_client *client, int id, int version);
+        void checkCommittedState();
+
+    protected:
+        void viewport_destroy_resource(Resource *resource) override;
+        void viewport_destroy(Resource *resource) override;
+        void viewport_set(Resource *resource, wl_fixed_t src_x, wl_fixed_t src_y, wl_fixed_t src_width, wl_fixed_t src_height, int32_t dst_width, int32_t dst_height) override;
+        void viewport_set_source(Resource *resource, wl_fixed_t x, wl_fixed_t y, wl_fixed_t width, wl_fixed_t height) override;
+        void viewport_set_destination(Resource *resource, int32_t width, int32_t height) override;
+
+    private:
+        QPointer<QWaylandSurface> m_surface = nullptr;
+    };
+};
+
+QT_END_NAMESPACE
+
+#endif // QWAYLANDWLSCALER_P_H