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diff --git a/src/extras/text/qdistancefieldglyphcache_p.h b/src/extras/text/qdistancefieldglyphcache_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2016 Klaralvdalens Datakonsult AB (KDAB).
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the Qt3D 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.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QT3DEXTRAS_QDISTANCEFIELDGLYPHCACHE_P_H
+#define QT3DEXTRAS_QDISTANCEFIELDGLYPHCACHE_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of other Qt classes.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QtCore/QRectF>
+#include <Qt3DCore/qnode.h>
+#include <Qt3DExtras/qt3dextras_global.h>
+
+QT_BEGIN_NAMESPACE
+
+class QRawFont;
+class QGlyphRun;
+
+namespace Qt3DCore {
+class QNode;
+}
+
+namespace Qt3DRender {
+class QAbstractTexture;
+}
+
+namespace Qt3DExtras {
+
+class DistanceFieldFont;
+class QDistanceFieldGlyphCachePrivate;
+
+class QDistanceFieldGlyphCache
+{
+public:
+    QDistanceFieldGlyphCache();
+    ~QDistanceFieldGlyphCache();
+
+    void setRootNode(Qt3DCore::QNode *rootNode);
+    Qt3DCore::QNode *rootNode() const;
+
+    struct Glyph {
+        Qt3DRender::QAbstractTexture *texture = nullptr;
+        QRectF glyphPathBoundingRect;   // bounding rect of the QPainterPath used to draw the glyph
+        QRectF texCoords;               // texture coordinates within texture
+    };
+
+    bool doubleGlyphResolution(const QRawFont &font);
+
+    QVector<Glyph> refGlyphs(const QGlyphRun &run);
+    Glyph refGlyph(const QRawFont &font, quint32 glyph);
+
+    void derefGlyphs(const QGlyphRun &run);
+    void derefGlyph(const QRawFont &font, quint32 glyph);
+
+private:
+    DistanceFieldFont* getOrCreateDistanceFieldFont(const QRawFont &font);
+    static QString fontKey(const QRawFont &font);
+
+    QHash<QString, DistanceFieldFont*> m_fonts;
+    Qt3DCore::QNode *m_rootNode;
+};
+
+} // namespace Qt3DExtras
+
+QT_END_NAMESPACE
+
+#endif // QT3DEXTRAS_QDISTANCEFIELDGLYPHCACHE_P_H