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diff --git a/src/gui/text/windows/qwindowsfontdatabase_p.h b/src/gui/text/windows/qwindowsfontdatabase_p.h
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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#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 "qwindowsfontdatabasebase_p.h"
+
+#include <qpa/qplatformfontdatabase.h>
+#include <QtCore/QSharedPointer>
+#include <QtCore/QLoggingCategory>
+#include <QtCore/qhashfunctions.h>
+#include <QtCore/qmutex.h>
+#include <QtCore/qt_windows.h>
+
+QT_BEGIN_NAMESPACE
+
+class QDebug;
+
+class Q_GUI_EXPORT QWindowsFontDatabase : public QWindowsFontDatabaseBase
+{
+ Q_DISABLE_COPY_MOVE(QWindowsFontDatabase)
+public:
+ enum FontOptions {
+ // Relevant bits from QWindowsIntegration::Options
+ DontUseDirectWriteFonts = 0x40,
+ DontUseColorFonts = 0x80
+ };
+
+ QWindowsFontDatabase();
+ ~QWindowsFontDatabase() override;
+
+ void ensureFamilyPopulated(const QString &familyName);
+
+ void populateFontDatabase() override;
+ void invalidate() override;
+ void removeApplicationFonts();
+
+ void populateFamily(const QString &familyName) override;
+ bool populateFamilyAliases(const QString &missingFamily) override;
+ QFontEngine *fontEngine(const QFontDef &fontDef, void *handle) override;
+ QFontEngine *fontEngine(const QByteArray &fontData, qreal pixelSize, QFont::HintingPreference hintingPreference) override;
+ QStringList fallbacksForFamily(const QString &family, QFont::Style style, QFont::StyleHint styleHint, QChar::Script script) const override;
+ QStringList addApplicationFont(const QByteArray &fontData, const QString &fileName, QFontDatabasePrivate::ApplicationFont *applicationFont = nullptr) override;
+ void releaseHandle(void *handle) override;
+ QString fontDir() const override;
+
+ QFont defaultFont() const override { return systemDefaultFont(); }
+ bool fontsAlwaysScalable() const override;
+ void derefUniqueFont(const QString &uniqueFont);
+ void refUniqueFont(const QString &uniqueFont);
+ bool isPrivateFontFamily(const QString &family) const override;
+
+ static QFontEngine *createEngine(const QFontDef &request, const QString &faceName,
+ int dpi,
+ const QSharedPointer<QWindowsFontEngineData> &data);
+
+ static qreal fontSmoothingGamma();
+
+ static void setFontOptions(unsigned options);
+ static unsigned fontOptions();
+
+#ifndef QT_NO_DEBUG_STREAM
+ static void debugFormat(QDebug &d, const LOGFONT &lf);
+#endif // !QT_NO_DEBUG_STREAM
+
+ struct FontHandle {
+ FontHandle(const QString &name) : faceName(name) {}
+ FontHandle(IDWriteFontFace *face, const QString &name);
+ ~FontHandle();
+
+ IDWriteFontFace *fontFace = nullptr;
+ QString faceName;
+ };
+
+private:
+ void addDefaultEUDCFont();
+
+ struct WinApplicationFont {
+ HANDLE handle;
+ QString fileName;
+ };
+
+ QList<WinApplicationFont> m_applicationFonts;
+
+ struct UniqueFontData {
+ HANDLE handle;
+ int refCount;
+ };
+
+ QMutex m_uniqueFontDataMutex; // protects m_uniqueFontData
+ QMap<QString, UniqueFontData> m_uniqueFontData;
+
+ static unsigned m_fontOptions;
+ QStringList m_eudcFonts;
+ bool m_hasPopulatedAliases = false;
+};
+
+#ifndef QT_NO_DEBUG_STREAM
+QDebug operator<<(QDebug, const QFontDef &def);
+#endif
+
+inline quint16 qt_getUShort(const unsigned char *p)
+{
+ quint16 val;
+ val = *p++ << 8;
+ val |= *p;
+
+ return val;
+}
+
+struct QFontNames
+{
+ QString name; // e.g. "DejaVu Sans Condensed"
+ QString style; // e.g. "Italic"
+ QString preferredName; // e.g. "DejaVu Sans"
+ QString preferredStyle; // e.g. "Condensed Italic"
+};
+
+struct QFontValues
+{
+ quint16 weight = 0;
+ bool isItalic = false;
+ bool isOverstruck = false;
+ bool isUnderlined = false;
+};
+
+bool qt_localizedName(const QString &name);
+QString qt_getEnglishName(const QString &familyName, bool includeStyle = false);
+QFontNames qt_getCanonicalFontNames(const LOGFONT &lf);
+
+struct FontAndStyle {
+ QString font;
+ QString style;
+
+ friend inline bool operator==(const FontAndStyle &lhs, const FontAndStyle &rhs) noexcept
+ { return lhs.font == rhs.font && lhs.style == rhs.style; }
+ friend inline bool operator!=(const FontAndStyle &lhs, const FontAndStyle &rhs) noexcept
+ { return !operator==(lhs, rhs); }
+};
+inline size_t qHash(const FontAndStyle &key, size_t seed) noexcept
+{
+ return qHashMulti(seed, key.font, key.style);
+}
+
+QT_END_NAMESPACE
+
+#endif // QWINDOWSFONTDATABASE_H