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diff --git a/src/plugins/platforms/wasm/qwasmbackingstore.h b/src/plugins/platforms/wasm/qwasmbackingstore.h
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+++ b/src/plugins/platforms/wasm/qwasmbackingstore.h
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+/****************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:GPL$
+** 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 QWASMBACKINGSTORE_H
+#define QWASMBACKINGSTORE_H
+
+#include <qpa/qplatformbackingstore.h>
+#include <QtGui/qimage.h>
+
+QT_BEGIN_NAMESPACE
+
+class QOpenGLTexture;
+class QRegion;
+class QWasmCompositor;
+
+class QWasmBackingStore : public QPlatformBackingStore
+{
+public:
+    QWasmBackingStore(QWasmCompositor *compositor, QWindow *window);
+    ~QWasmBackingStore();
+
+    QPaintDevice *paintDevice() override;
+
+    void beginPaint(const QRegion &) override;
+    void flush(QWindow *window, const QRegion &region, const QPoint &offset) override;
+    void resize(const QSize &size, const QRegion &staticContents) override;
+    QImage toImage() const override;
+    const QImage &getImageRef() const;
+
+    const QOpenGLTexture *getUpdatedTexture();
+
+protected:
+    void updateTexture();
+
+private:
+    QWasmCompositor *m_compositor;
+    QImage m_image;
+    QScopedPointer<QOpenGLTexture> m_texture;
+    QRegion m_dirty;
+};
+
+QT_END_NAMESPACE
+
+#endif // QWASMBACKINGSTORE_H