#include <qcoretextfontdatabase_p.h>

Inheritance diagram for QCoreTextFontDatabase:

Collaboration diagram for QCoreTextFontDatabase:

Public Member Functions
	QCoreTextFontDatabase ()

	~QCoreTextFontDatabase ()

void	populateFontDatabase () override
	This function is called once at startup by Qt's internal font database.

bool	populateFamilyAliases (const QString &missingFamily) override

void	populateFamily (const QString &familyName) override
	This function is called whenever a lazily populated family, populated through registerFontFamily(), needs full population.

void	invalidate () override
	This function is called whenever the font database is invalidated.

QStringList	fallbacksForFamily (const QString &family, QFont::Style style, QFont::StyleHint styleHint, QChar::Script script) const override
	Returns a list of alternative fonts for the specified family and style and script using the styleHint given.

QStringList	addApplicationFont (const QByteArray &fontData, const QString &fileName, QFontDatabasePrivate::ApplicationFont *applicationFont=nullptr) override
	Adds an application font described by the font contained supplied fontData or using the font contained in the file referenced by fileName.

void	releaseHandle (void *handle) override
	Releases the specified font handle.

bool	isPrivateFontFamily (const QString &family) const override
	Returns true if the font family is private.

QFont	defaultFont () const override
	Returns the default system font.

bool	fontsAlwaysScalable () const override
	Return true if all fonts are considered scalable when using this font database.

QList< int >	standardSizes () const override
	Return list of standard font sizes when using this font database.

bool	supportsVariableApplicationFonts () const override
	Returns true if this font database supports loading named instances from variable application fonts.

QFont *	themeFont (QPlatformTheme::Font) const

Public Member Functions inherited from QPlatformFontDatabase
virtual	~QPlatformFontDatabase ()

virtual QFontEngine *	fontEngine (const QFontDef &fontDef, void *handle)
	Returns the font engine that can be used to render the font described by the font definition, fontDef, in the specified script.

virtual QFontEngine *	fontEngine (const QByteArray &fontData, qreal pixelSize, QFont::HintingPreference hintingPreference)
	Returns the font engine that will be used to back a QRawFont, based on the given \fontData, pixelSize, and hintingPreference.

virtual QFontEngineMulti *	fontEngineMulti (QFontEngine *fontEngine, QChar::Script script)
	Returns a multi font engine in the specified script to encapsulate fontEngine with the option to fall back to the fonts given by fallbacks if fontEngine does not support a certain character.

virtual QString	fontDir () const
	Returns the directory containing the fonts used by the database.

virtual QString	resolveFontFamilyAlias (const QString &family) const
	Resolve alias to actual font family names.

Additional Inherited Members
Static Public Member Functions inherited from QPlatformFontDatabase
static QSupportedWritingSystems	writingSystemsFromTrueTypeBits (quint32 unicodeRange[4], quint32 codePageRange[2])
	Helper function that determines the writing systems support by a given unicodeRange and codePageRange.

static QSupportedWritingSystems	writingSystemsFromOS2Table (const char *os2Table, size_t length)
	Helper function that determines the writing system support based on the contents of the OS/2 table in the font.

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, const QSupportedWritingSystems &writingSystems, void *handle)
	Registers a font with the given set of attributes describing the font's foundry, family name, style and stretch information, pixel size, and supported writing systems.

static void	registerFontFamily (const QString &familyName)
	Registers a font family with the font database.

static void	registerAliasToFontFamily (const QString &familyName, const QString &alias)
	Helper function that register the alias for the familyName.

static void	repopulateFontDatabase ()
	Requests that the platform font database should be repopulated.

static bool	isFamilyPopulated (const QString &familyName)
	Helper function that returns true if the font family has already been registered and populated.

Detailed Description

Definition at line 32 of file qcoretextfontdatabase_p.h.

Constructor & Destructor Documentation

◆ QCoreTextFontDatabase()

QCoreTextFontDatabase::QCoreTextFontDatabase ( )

Definition at line 77 of file qcoretextfontdatabase.mm.

References qCDebug, and QPlatformFontDatabase::repopulateFontDatabase().

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◆ ~QCoreTextFontDatabase()

QCoreTextFontDatabase::~QCoreTextFontDatabase ( )

Definition at line 88 of file qcoretextfontdatabase.mm.

References qDeleteAll().

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Member Function Documentation

◆ addApplicationFont()

QStringList QCoreTextFontDatabase::addApplicationFont	(	const QByteArray &	fontData,
		const QString &	fileName,
		QFontDatabasePrivate::ApplicationFont *	applicationFont = nullptr )

overridevirtual

Adds an application font described by the font contained supplied fontData or using the font contained in the file referenced by fileName.

Returns a list of family names, or an empty list if the font could not be added.

If applicationFont is non-null, its properties list should be filled with information from the loaded fonts. This is exposed through FontLoader in Qt Quick where it is needed for disambiguating fonts in the same family. When the function exits, the applicationFont should contain an entry of properties per font in the file, or it should be empty if no font was loaded.

Note: The default implementation of this function does not add an application font. Subclasses should reimplement this function to perform the necessary loading and registration of fonts.

Reimplemented from QPlatformFontDatabase.

Definition at line 738 of file qcoretextfontdatabase.mm.

References fileName, QUrl::fromLocalFile(), i, kQtFontDataAttribute, and QByteArray().

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◆ defaultFont()

QFont QCoreTextFontDatabase::defaultFont ( ) const

overridevirtual

Returns the default system font.

See also: QGuiApplication::font()

Since: 5.0

Reimplemented from QPlatformFontDatabase.

Definition at line 996 of file qcoretextfontdatabase.mm.

References QPlatformTheme::SystemFont.

◆ fallbacksForFamily()

QStringList QCoreTextFontDatabase::fallbacksForFamily	(	const QString &	family,
		QFont::Style	style,
		QFont::StyleHint	styleHint,
		QChar::Script	script ) const

overridevirtual

Returns a list of alternative fonts for the specified family and style and script using the styleHint given.

Default implementation returns a list of fonts for which style and script support has been reported during the font database population.

Reimplemented from QPlatformFontDatabase.

Definition at line 632 of file qcoretextfontdatabase.mm.

References descriptorForFamily(), descriptorForStyle(), fallbacksForDescriptor(), fallbacksForFamily(), i, QString::isEmpty(), pool, Q_UNUSED, qCDebug, qPrintable, QStringLiteral, and qt_sort_families_by_writing_system().

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◆ fontsAlwaysScalable()

bool QCoreTextFontDatabase::fontsAlwaysScalable ( ) const

overridevirtual

Return true if all fonts are considered scalable when using this font database.

Defaults to false.

Since: 5.0

Reimplemented from QPlatformFontDatabase.

Definition at line 1001 of file qcoretextfontdatabase.mm.

◆ invalidate()

void QCoreTextFontDatabase::invalidate ( )

overridevirtual

This function is called whenever the font database is invalidated.

Reimplement this function to clear any internal data structures that will need to be rebuilt at the next call to populateFontDatabase().

Reimplemented from QPlatformFontDatabase.

Definition at line 311 of file qcoretextfontdatabase.mm.

References QHash< Key, T >::clear(), qCDebug, and qDeleteAll().

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◆ isPrivateFontFamily()

bool QCoreTextFontDatabase::isPrivateFontFamily ( const QString & family ) const

overridevirtual

Returns true if the font family is private.

For any given family name, the result is platform dependent.

Reimplemented from QPlatformFontDatabase.

Definition at line 783 of file qcoretextfontdatabase.mm.

References QString::contains(), QPlatformFontDatabase::isPrivateFontFamily(), and QString::startsWith().

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◆ populateFamily()

void QCoreTextFontDatabase::populateFamily ( const QString & familyName )

overridevirtual

This function is called whenever a lazily populated family, populated through registerFontFamily(), needs full population.

You are expected to fully populate the family by calling registerFont() for each font that matches the family name.

Reimplemented from QPlatformFontDatabase.

Definition at line 292 of file qcoretextfontdatabase.mm.

References descriptorForFamily(), i, qCDebug, and qCWarning.

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◆ populateFamilyAliases()

bool QCoreTextFontDatabase::populateFamilyAliases ( const QString & missingFamily )

overridevirtual

Reimplemented from QPlatformFontDatabase.

Definition at line 231 of file qcoretextfontdatabase.mm.

References elapsed(), isEqual(), QPlatformFontDatabase::isFamilyPopulated(), Q_UNUSED, qCDebug, qCWarning, qPrintable, and QPlatformFontDatabase::registerAliasToFontFamily().

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◆ populateFontDatabase()

void QCoreTextFontDatabase::populateFontDatabase ( )

overridevirtual

This function is called once at startup by Qt's internal font database.

Reimplement this function in a subclass for a convenient place to initialize the internal font database.

You may lazily populate the database by calling registerFontFamily() instead of registerFont(), in which case you'll get a callback to populateFamily() when the required family needs population. You then call registerFont() to finish population of the family.

The default implementation does nothing.

Reimplemented from QPlatformFontDatabase.

Definition at line 99 of file qcoretextfontdatabase.mm.

References QHash< Key, T >::clear(), QOperatingSystemVersionBase::current(), elapsed(), QHash< Key, T >::keys(), QOperatingSystemVersion::MacOSCatalina, Q_ASSERT, qCDebug, qEnvironmentVariableIsSet(), QStringLiteral, QPlatformFontDatabase::registerFontFamily(), and QHash< Key, T >::value().