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diff --git a/src/platformsupport/fontdatabases/windows/qwindowsfontdatabase_p.h b/src/platformsupport/fontdatabases/windows/qwindowsfontdatabase_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 plugins 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 QWINDOWSFONTDATABASE_H
+#define QWINDOWSFONTDATABASE_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 <qpa/qplatformfontdatabase.h>
+#include <QtCore/QSharedPointer>
+#include <QtCore/QLoggingCategory>
+#include <QtCore/qt_windows.h>
+
+#if !defined(QT_NO_DIRECTWRITE)
+    struct IDWriteFactory;
+    struct IDWriteGdiInterop;
+#endif
+
+QT_BEGIN_NAMESPACE
+
+Q_DECLARE_LOGGING_CATEGORY(lcQpaFonts)
+
+class QWindowsFontEngineData
+{
+    Q_DISABLE_COPY(QWindowsFontEngineData)
+public:
+    QWindowsFontEngineData();
+    ~QWindowsFontEngineData();
+
+    uint pow_gamma[256];
+
+    bool clearTypeEnabled;
+    qreal fontSmoothingGamma;
+    HDC hdc;
+#if !defined(QT_NO_DIRECTWRITE)
+    IDWriteFactory *directWriteFactory;
+    IDWriteGdiInterop *directWriteGdiInterop;
+#endif
+};
+
+class QWindowsFontDatabase : public QPlatformFontDatabase
+{
+public:
+    enum FontOptions {
+        // Relevant bits from QWindowsIntegration::Options
+        DontUseDirectWriteFonts = 0x40,
+        DontUseColorFonts = 0x80
+    };
+
+    QWindowsFontDatabase();
+    ~QWindowsFontDatabase();
+
+    void populateFontDatabase() Q_DECL_OVERRIDE;
+    void populateFamily(const QString &familyName) Q_DECL_OVERRIDE;
+    QFontEngineMulti *fontEngineMulti(QFontEngine *fontEngine, QChar::Script script) Q_DECL_OVERRIDE;
+    QFontEngine *fontEngine(const QFontDef &fontDef, void *handle) Q_DECL_OVERRIDE;
+    QFontEngine *fontEngine(const QByteArray &fontData, qreal pixelSize, QFont::HintingPreference hintingPreference) Q_DECL_OVERRIDE;
+    QStringList fallbacksForFamily(const QString &family, QFont::Style style, QFont::StyleHint styleHint, QChar::Script script) const Q_DECL_OVERRIDE;
+    QStringList addApplicationFont(const QByteArray &fontData, const QString &fileName) Q_DECL_OVERRIDE;
+    void releaseHandle(void *handle) Q_DECL_OVERRIDE;
+    QString fontDir() const Q_DECL_OVERRIDE;
+
+    QFont defaultFont() const  Q_DECL_OVERRIDE { return systemDefaultFont(); }
+    bool fontsAlwaysScalable() const Q_DECL_OVERRIDE;
+    void derefUniqueFont(const QString &uniqueFont);
+    void refUniqueFont(const QString &uniqueFont);
+
+    static QFont systemDefaultFont();
+
+    static QFontEngine *createEngine(const QFontDef &request,
+                                     int dpi,
+                                     const QSharedPointer<QWindowsFontEngineData> &data);
+
+    static HFONT systemFont();
+    static QFont LOGFONT_to_QFont(const LOGFONT& lf, int verticalDPI = 0);
+
+    static qreal fontSmoothingGamma();
+    static LOGFONT fontDefToLOGFONT(const QFontDef &fontDef);
+
+    static QStringList extraTryFontsForFamily(const QString &family);
+    static QString familyForStyleHint(QFont::StyleHint styleHint);
+
+    static int defaultVerticalDPI();
+
+    static void setFontOptions(unsigned options);
+    static unsigned fontOptions();
+
+    static QString readRegistryString(HKEY parentHandle, const wchar_t *keyPath, const wchar_t *keyName);
+
+private:
+    void populateFamily(const QString &familyName, bool registerAlias);
+    void removeApplicationFonts();
+
+    struct WinApplicationFont {
+        HANDLE handle;
+        QString fileName;
+    };
+
+    QList<WinApplicationFont> m_applicationFonts;
+
+    struct UniqueFontData {
+        HANDLE handle;
+        QAtomicInt refCount;
+    };
+
+    QMap<QString, UniqueFontData> m_uniqueFontData;
+
+    static unsigned m_fontOptions;
+};
+
+#ifndef QT_NO_DEBUG_STREAM
+QDebug operator<<(QDebug, const QFontDef &def);
+#endif
+
+QT_END_NAMESPACE
+
+#endif // QWINDOWSFONTDATABASE_H