#include <qfontconfigdatabase_p.h>

Inheritance diagram for QFontconfigDatabase:

Collaboration diagram for QFontconfigDatabase:

Public Member Functions
	~QFontconfigDatabase () override

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

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

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

QFontEngineMulti *	fontEngineMulti (QFontEngine *fontEngine, QChar::Script script) override
	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.

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

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

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.

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

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

Public Member Functions inherited from QFreeTypeFontDatabase
void	populateFontDatabase () override
	This function is called once at startup by Qt's internal font database.

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

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

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

Public Member Functions inherited from QPlatformFontDatabase
virtual	~QPlatformFontDatabase ()

virtual bool	populateFamilyAliases (const QString &missingFamily)

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

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

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

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

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

Additional Inherited Members
Static Public Member Functions inherited from QFreeTypeFontDatabase
static void	addNamedInstancesForFace (void *face, int faceIndex, const QString &family, const QString &styleName, QFont::Weight weight, QFont::Stretch stretch, QFont::Style style, bool fixedPitch, const QSupportedWritingSystems &writingSystems, const QByteArray &fileName, const QByteArray &fontData)

static QStringList	addTTFile (const QByteArray &fontData, const QByteArray &file, QFontDatabasePrivate::ApplicationFont *applicationFont=nullptr)

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 25 of file qfontconfigdatabase_p.h.

Constructor & Destructor Documentation

◆ ~QFontconfigDatabase()

QFontconfigDatabase::~QFontconfigDatabase ( )

override

Definition at line 554 of file qfontconfigdatabase.cpp.

Member Function Documentation

◆ addApplicationFont()

QStringList QFontconfigDatabase::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 866 of file qfontconfigdatabase.cpp.

References QFile::encodeName(), fileName, QString::fromUtf8(), populateFromPattern(), queryFont(), and set.

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◆ defaultFont()

QFont QFontconfigDatabase::defaultFont ( ) const

overridevirtual

Returns the default system font.

See also: QGuiApplication::font()

Since: 5.0

Reimplemented from QPlatformFontDatabase.

Definition at line 935 of file qfontconfigdatabase.cpp.

References QString::fromUtf8().

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◆ fallbacksForFamily()

QStringList QFontconfigDatabase::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 763 of file qfontconfigdatabase.cpp.

References QByteArray::data(), QString::fromUtf8(), getFcFamilyForStyleHint(), i, QString::isEmpty(), Q_ASSERT, specialLanguages, QFont::StyleItalic, QFont::StyleOblique, QString::toCaseFolded(), QString::toUtf8(), and void.

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◆ fontEngine() [1/2]

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

overridevirtual

Returns the font engine that will be used to back a QRawFont, based on the given \fontData, pixelSize, and hintingPreference.

This function is called by QRawFont, and does not play a part in the normal operations of QFontDatabase.

Reimplemented from QPlatformFontDatabase.

Definition at line 752 of file qfontconfigdatabase.cpp.

References engine, and QFreeTypeFontDatabase::fontEngine().

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◆ fontEngine() [2/2]

QFontEngine * QFontconfigDatabase::fontEngine	(	const QFontDef &	fontDef,
		void *	handle )

overridevirtual

Returns the font engine that can be used to render the font described by the font definition, fontDef, in the specified script.

This function is called by QFontDatabase both for system fonts provided by the platform font database, as well as for application fonts added by the application developer.

The handle is the QPlatformFontDatabase specific handle passed when registering the font family via QPlatformFontDatabase::registerFont.

The function is called for both fonts added via a filename as well as fonts added from QByteArray data. Subclasses will need to handle both cases via its platform specific handle.

Reimplemented from QPlatformFontDatabase.

Definition at line 726 of file qfontconfigdatabase.cpp.

References QFile::encodeName(), engine, and QFontEngine::FaceId::filename.

Referenced by fontEngineMulti().

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◆ fontEngineMulti()

QFontEngineMulti * QFontconfigDatabase::fontEngineMulti	(	QFontEngine *	fontEngine,
		QChar::Script	script )

overridevirtual

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.

Reimplemented from QPlatformFontDatabase.

Definition at line 639 of file qfontconfigdatabase.cpp.

References fontEngine().

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◆ invalidate()

void QFontconfigDatabase::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 633 of file qfontconfigdatabase.cpp.

◆ populateFontDatabase()

void QFontconfigDatabase::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 559 of file qfontconfigdatabase.cpp.

References defaults, QString::fromLatin1(), i, QFontDatabase::Latin, QFont::Normal, populateFromPattern(), properties, QPlatformFontDatabase::registerFont(), QFont::StyleItalic, QFont::StyleNormal, QFont::StyleOblique, and QFont::Unstretched.