#include <qfreetypefontdatabase_p.h>

Inheritance diagram for QFreeTypeFontDatabase:

Collaboration diagram for QFreeTypeFontDatabase:

Public Member Functions
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.

Public Member Functions inherited from QPlatformFontDatabase
virtual	~QPlatformFontDatabase ()

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

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

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

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

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

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

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

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

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

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.

Static Public Member Functions
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 36 of file qfreetypefontdatabase_p.h.

Member Function Documentation

◆ addApplicationFont()

QStringList QFreeTypeFontDatabase::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 67 of file qfreetypefontdatabase.cpp.

References addTTFile(), and fileName.

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◆ addTTFile()

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

static

Definition at line 80 of file qfreetypefontdatabase.cpp.

References QFont::Black, QFont::Bold, QFont::Condensed, QFile::decodeName(), QFont::DemiBold, error, QFont::Expanded, QFont::ExtraBold, QFont::ExtraCondensed, QFont::ExtraExpanded, QFont::ExtraLight, file, QString::fromLatin1(), Qt::hex(), i, QFont::Light, QFont::Medium, QFont::Normal, properties, QFontDatabasePrivate::ApplicationFont::properties, qDebug, qt_getFreetype(), QPlatformFontDatabase::registerFont(), QFont::SemiCondensed, QFont::SemiExpanded, QSupportedWritingSystems::setSupported(), QFont::StyleItalic, QFont::StyleNormal, QFontDatabase::Symbol, QFont::Thin, QFont::UltraCondensed, QFont::UltraExpanded, QFont::Unstretched, and QPlatformFontDatabase::writingSystemsFromTrueTypeBits().

Referenced by addApplicationFont(), populateFontDatabase(), QAndroidPlatformFontDatabase::populateFontDatabase(), QWasmFontDatabase::populateFontDatabase(), and QWasmFontDatabase::populateLocalfonts().

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◆ fontEngine() [1/2]

QFontEngine * QFreeTypeFontDatabase::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.

Reimplemented in QWindowsFontDatabaseFT.

Definition at line 61 of file qfreetypefontdatabase.cpp.

References QFontEngineFT::create().

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◆ fontEngine() [2/2]

QFontEngine * QFreeTypeFontDatabase::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.

Reimplemented in QWindowsFontDatabaseFT, and QWasmFontDatabase.

Definition at line 51 of file qfreetypefontdatabase.cpp.

References QFontEngineFT::create(), FontFile::data, QFile::encodeName(), FontFile::fileName, QFontEngine::FaceId::filename, QFontEngine::FaceId::index, and FontFile::indexValue.

Referenced by QFontconfigDatabase::fontEngine(), QWindowsFontDatabaseFT::fontEngine(), QWindowsFontDatabaseFT::fontEngine(), and QWasmFontDatabase::fontEngine().

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◆ populateFontDatabase()

void QFreeTypeFontDatabase::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.

Reimplemented in QWindowsFontDatabaseFT, and QWasmFontDatabase.

Definition at line 25 of file qfreetypefontdatabase.cpp.

References QFileInfo::absoluteFilePath(), addTTFile(), dir, QFile::encodeName(), fi, file, QDir::Files, QPlatformFontDatabase::fontDir(), QList< QString >::fromReadOnlyData(), qPrintable, and qWarning.