qwindowsdirectwritefontdatabase_p.h

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// Copyright (C) 2020 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 QWINDOWSDIRECTWRITEFONTDATABASE_P_H
#define QWINDOWSDIRECTWRITEFONTDATABASE_P_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 <QtGui/qtguiglobal.h>
#include <QtGui/private/qtgui-config_p.h>
 
QT_REQUIRE_CONFIG(directwrite3);
 
#include "qwindowsfontdatabase_p.h"
#include <QtCore/qloggingcategory.h>
#include <dwrite_3.h>
 
QT_BEGIN_NAMESPACE
 
class Q_GUI_EXPORT QWindowsDirectWriteFontDatabase : public QWindowsFontDatabase
{
    Q_DISABLE_COPY_MOVE(QWindowsDirectWriteFontDatabase)
public:
    QWindowsDirectWriteFontDatabase();
    ~QWindowsDirectWriteFontDatabase() override;
 
    void populateFontDatabase() override;
    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,
                                   QFontDatabasePrivate::ExtendedScript script) const override;
    QStringList addApplicationFont(const QByteArray &fontData, const QString &fileName, QFontDatabasePrivate::ApplicationFont *font = nullptr) override;
 
    bool isPrivateFontFamily(const QString &family) const override;
    bool supportsVariableApplicationFonts() const override;
 
    void registerBitmapFont(const QString &bitmapFont)
    {
        m_populatedBitmapFonts.insert(bitmapFont);
    }
 
    bool hasPopulatedFont(const QString &fontFamily) const
    {
        return m_populatedFonts.contains(fontFamily);
    }
 
    static QFont::Stretch fromDirectWriteStretch(DWRITE_FONT_STRETCH stretch);
    static QFont::Weight fromDirectWriteWeight(DWRITE_FONT_WEIGHT weight);
    static QFont::Style fromDirectWriteStyle(DWRITE_FONT_STYLE style);
 
protected:
    void invalidate() override;
 
private:
    friend class QWindowsFontEngineDirectWrite;
    static QString localeString(IDWriteLocalizedStrings *names, wchar_t localeName[]);
 
    template<typename T>
    static void collectAdditionalNames(T *fontFace,
                                       wchar_t *defaultLocale,
                                       wchar_t *englishLocale,
                                       std::function<void(const std::pair<QString, QString> &)> registerFamily);
 
    QSupportedWritingSystems supportedWritingSystems(IDWriteFontFace *face) const;
 
    QHash<QString, IDWriteFontFamily *> m_populatedFonts;
    QSet<QString> m_populatedBitmapFonts;
};
 
QT_END_NAMESPACE
 
#endif // QWINDOWSDIRECTWRITEFONTDATABASE_P_H