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diff --git a/src/platformsupport/fontdatabases/windows/qwindowsfontenginedirectwrite_p.h b/src/platformsupport/fontdatabases/windows/qwindowsfontenginedirectwrite_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtGui 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 QWINDOWSFONTENGINEDIRECTWRITE_H
+#define QWINDOWSFONTENGINEDIRECTWRITE_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.
+//
+
+#include <QtCore/qglobal.h>
+
+#ifndef QT_NO_DIRECTWRITE
+
+#include <QtGui/private/qfontengine_p.h>
+#include <QtCore/QSharedPointer>
+
+struct IDWriteFont;
+struct IDWriteFontFace;
+struct IDWriteFontFile;
+struct IDWriteFactory;
+struct IDWriteBitmapRenderTarget;
+struct IDWriteGdiInterop;
+struct IDWriteGlyphRunAnalysis;
+
+QT_BEGIN_NAMESPACE
+
+class QWindowsFontEngineData;
+
+class QWindowsFontEngineDirectWrite : public QFontEngine
+{
+public:
+    explicit QWindowsFontEngineDirectWrite(IDWriteFontFace *directWriteFontFace,
+                                    qreal pixelSize,
+                                    const QSharedPointer<QWindowsFontEngineData> &d);
+    ~QWindowsFontEngineDirectWrite();
+
+    void initFontInfo(const QFontDef &request, int dpi);
+
+    QFixed lineThickness() const Q_DECL_OVERRIDE;
+    QFixed underlinePosition() const Q_DECL_OVERRIDE;
+    bool getSfntTableData(uint tag, uchar *buffer, uint *length) const Q_DECL_OVERRIDE;
+    QFixed emSquareSize() const Q_DECL_OVERRIDE;
+
+    glyph_t glyphIndex(uint ucs4) const Q_DECL_OVERRIDE;
+    bool stringToCMap(const QChar *str, int len, QGlyphLayout *glyphs, int *nglyphs,
+                      ShaperFlags flags) const Q_DECL_OVERRIDE;
+    void recalcAdvances(QGlyphLayout *glyphs, ShaperFlags) const Q_DECL_OVERRIDE;
+
+    void addGlyphsToPath(glyph_t *glyphs, QFixedPoint *positions, int nglyphs,
+                         QPainterPath *path, QTextItem::RenderFlags flags) Q_DECL_OVERRIDE;
+
+    glyph_metrics_t boundingBox(const QGlyphLayout &glyphs) Q_DECL_OVERRIDE;
+    glyph_metrics_t boundingBox(glyph_t g) Q_DECL_OVERRIDE;
+    glyph_metrics_t alphaMapBoundingBox(glyph_t glyph, QFixed,
+                                        const QTransform &matrix, GlyphFormat) Q_DECL_OVERRIDE;
+
+    QFixed ascent() const Q_DECL_OVERRIDE;
+    QFixed capHeight() const Q_DECL_OVERRIDE;
+    QFixed descent() const Q_DECL_OVERRIDE;
+    QFixed leading() const Q_DECL_OVERRIDE;
+    QFixed xHeight() const Q_DECL_OVERRIDE;
+    qreal maxCharWidth() const Q_DECL_OVERRIDE;
+    FaceId faceId() const Q_DECL_OVERRIDE;
+
+    bool supportsSubPixelPositions() const Q_DECL_OVERRIDE;
+
+    QImage alphaMapForGlyph(glyph_t glyph, QFixed subPixelPosition) Q_DECL_OVERRIDE;
+    QImage alphaMapForGlyph(glyph_t glyph, QFixed subPixelPosition, const QTransform &t) Q_DECL_OVERRIDE;
+    QImage alphaRGBMapForGlyph(glyph_t t, QFixed subPixelPosition, const QTransform &xform) Q_DECL_OVERRIDE;
+    QImage bitmapForGlyph(glyph_t, QFixed subPixelPosition, const QTransform &t) Q_DECL_OVERRIDE;
+
+    QFontEngine *cloneWithSize(qreal pixelSize) const Q_DECL_OVERRIDE;
+    Qt::HANDLE handle() const Q_DECL_OVERRIDE;
+
+    const QSharedPointer<QWindowsFontEngineData> &fontEngineData() const { return m_fontEngineData; }
+
+    static QString fontNameSubstitute(const QString &familyName);
+
+    IDWriteFontFace *directWriteFontFace() const { return m_directWriteFontFace; }
+
+    void setUniqueFamilyName(const QString &newName) { m_uniqueFamilyName = newName; }
+
+private:
+    QImage imageForGlyph(glyph_t t, QFixed subPixelPosition, int margin, const QTransform &xform);
+    void collectMetrics();
+    void renderGlyphRun(QImage *destination, float r, float g, float b, float a, IDWriteGlyphRunAnalysis *glyphAnalysis, const QRect &boundingRect);
+    static QString filenameFromFontFile(IDWriteFontFile *fontFile);
+
+    const QSharedPointer<QWindowsFontEngineData> m_fontEngineData;
+
+    IDWriteFontFace *m_directWriteFontFace;
+    IDWriteBitmapRenderTarget *m_directWriteBitmapRenderTarget;
+
+    QFixed m_lineThickness;
+    QFixed m_underlinePosition;
+    int m_unitsPerEm;
+    QFixed m_ascent;
+    QFixed m_capHeight;
+    QFixed m_descent;
+    QFixed m_xHeight;
+    QFixed m_lineGap;
+    FaceId m_faceId;
+    QString m_uniqueFamilyName;
+};
+
+QT_END_NAMESPACE
+
+#endif // QT_NO_DIRECTWRITE
+
+#endif // QWINDOWSFONTENGINEDIRECTWRITE_H