qplatformfontdatabase.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 QPLATFORMFONTDATABASE_H

#define QPLATFORMFONTDATABASE_H

//

//  W A R N I N G

//  -------------

//

// This file is part of the QPA API and is not meant to be used

// in applications. Usage of this API may make your code

// source and binary incompatible with future versions of Qt.

//

#include <QtGui/qtguiglobal.h>

#include <QtCore/qloggingcategory.h>

#include <QtCore/QString>

#include <QtCore/QStringList>

#include <QtCore/QList>

#include <QtGui/QFontDatabase>

#include <QtGui/private/qfontengine_p.h>

#include <QtGui/private/qfontdatabase_p.h>

QT_BEGIN_NAMESPACE

QT_DECLARE_EXPORTED_QT_LOGGING_CATEGORY(lcQpaFonts, Q_GUI_EXPORT)

class QWritingSystemsPrivate;

class Q_GUI_EXPORT QSupportedWritingSystems

public:

    QSupportedWritingSystems();

    QSupportedWritingSystems(const QSupportedWritingSystems &other);

    QSupportedWritingSystems &operator=(const QSupportedWritingSystems &other);

    ~QSupportedWritingSystems();

    void setSupported(QFontDatabase::WritingSystem, bool supported = true);

    bool supported(QFontDatabase::WritingSystem) const;

private:

    void detach();

    QWritingSystemsPrivate *d;

    friend Q_GUI_EXPORT bool operator==(const QSupportedWritingSystems &, const QSupportedWritingSystems &);

    friend Q_GUI_EXPORT bool operator!=(const QSupportedWritingSystems &, const QSupportedWritingSystems &);

#ifndef QT_NO_DEBUG_STREAM

    friend Q_GUI_EXPORT QDebug operator<<(QDebug, const QSupportedWritingSystems &);

#endif

};

Q_GUI_EXPORT bool operator==(const QSupportedWritingSystems &, const QSupportedWritingSystems &);

Q_GUI_EXPORT bool operator!=(const QSupportedWritingSystems &, const QSupportedWritingSystems &);

#ifndef QT_NO_DEBUG_STREAM

Q_GUI_EXPORT QDebug operator<<(QDebug, const QSupportedWritingSystems &);

#endif

class QFontRequestPrivate;

class QFontEngineMulti;

class Q_GUI_EXPORT QPlatformFontDatabase

public:

    virtual ~QPlatformFontDatabase();

    virtual void populateFontDatabase();

    virtual bool populateFamilyAliases(const QString &missingFamily) { Q_UNUSED(missingFamily); return false; }

    virtual void populateFamily(const QString &familyName);

    virtual void invalidate();

    virtual QStringList fallbacksForFamily(const QString &family, QFont::Style style, QFont::StyleHint styleHint, QFontDatabasePrivate::ExtendedScript script) const;

    virtual QStringList addApplicationFont(const QByteArray &fontData, const QString &fileName, QFontDatabasePrivate::ApplicationFont *font = nullptr);

    virtual QFontEngine *fontEngine(const QFontDef &fontDef, void *handle);

    virtual QFontEngine *fontEngine(const QByteArray &fontData, qreal pixelSize, QFont::HintingPreference hintingPreference);

    virtual QFontEngineMulti *fontEngineMulti(QFontEngine *fontEngine, QFontDatabasePrivate::ExtendedScript script);

    virtual void releaseHandle(void *handle);

    virtual QString fontDir() const;

    virtual QFont defaultFont() const;

    virtual bool isPrivateFontFamily(const QString &family) const;

    virtual QString resolveFontFamilyAlias(const QString &family) const;

    virtual bool fontsAlwaysScalable() const;

    virtual QList<int> standardSizes() const;

    virtual bool supportsVariableApplicationFonts() const;

    virtual bool supportsColrv0Fonts() const;

    // helper

    static QSupportedWritingSystems writingSystemsFromTrueTypeBits(quint32 unicodeRange[4], quint32 codePageRange[2]);

    static QSupportedWritingSystems writingSystemsFromOS2Table(const char *os2Table, size_t length);

    //callback

    static void registerFont(const QString &familyname, const QString &stylename,

                             const QString &foundryname, QFont::Weight weight,

                             QFont::Style style, QFont::Stretch stretch, bool antialiased,

                             bool scalable, int pixelSize, bool fixedPitch, bool colorFont,

                             const QSupportedWritingSystems &writingSystems, void *handle);

    static void registerFontFamily(const QString &familyName);

    static void registerAliasToFontFamily(const QString &familyName, const QString &alias);

    static void repopulateFontDatabase();

    static bool isFamilyPopulated(const QString &familyName);

};

QT_END_NAMESPACE

#endif // QPLATFORMFONTDATABASE_H