Font database for Windows. More...

#include <qwindowsfontdatabase_p.h>

Inheritance diagram for QWindowsFontDatabase:

Collaboration diagram for QWindowsFontDatabase:

Public Types
enum	FontOptions { DontUseDirectWriteFonts = 0x40 , DontUseColorFonts = 0x80 }

Public Member Functions
	QWindowsFontDatabase ()

	~QWindowsFontDatabase () override

void	ensureFamilyPopulated (const QString &familyName)

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.

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

bool	populateFamilyAliases (const QString &missingFamily) override

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.

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

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

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.

void	derefUniqueFont (const QString &uniqueFont)

void	refUniqueFont (const QString &uniqueFont)

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

Public Member Functions inherited from QWindowsFontDatabaseBase
	QWindowsFontDatabaseBase ()

	~QWindowsFontDatabaseBase () override

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.

QFontDef	sanitizeRequest (QFontDef request) const

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 QFontEngine *	createEngine (const QFontDef &request, const QString &faceName, int dpi, const QSharedPointer< QWindowsFontEngineData > &data)

static qreal	fontSmoothingGamma ()

static void	setFontOptions (unsigned options)

static unsigned	fontOptions ()

static void	debugFormat (QDebug &d, const LOGFONT &lf)

Static Public Member Functions inherited from QWindowsFontDatabaseBase
static int	defaultVerticalDPI ()

static QSharedPointer< QWindowsFontEngineData >	data ()

static QFont	systemDefaultFont ()

static HFONT	systemFont ()

static LOGFONT	fontDefToLOGFONT (const QFontDef &fontDef, const QString &faceName)

static QFont	LOGFONT_to_QFont (const LOGFONT &lf, int verticalDPI=0)

static QString	familyForStyleHint (QFont::StyleHint styleHint)

static QStringList	extraTryFontsForFamily (const QString &family)

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

Font database for Windows.

Note: The Qt 4.8 WIndows font database employed a mechanism of delayed population of the database again passing a font name to EnumFontFamiliesEx(), working around the fact that EnumFontFamiliesEx() does not list all fonts by default. This should be introduced to QPA as well?

Definition at line 30 of file qwindowsfontdatabase_p.h.

Member Enumeration Documentation

◆ FontOptions

enum QWindowsFontDatabase::FontOptions

Enumerator
DontUseDirectWriteFonts
DontUseColorFonts

Definition at line 34 of file qwindowsfontdatabase_p.h.

Constructor & Destructor Documentation

◆ QWindowsFontDatabase()

QWindowsFontDatabase::QWindowsFontDatabase ( )

Definition at line 739 of file qwindowsfontdatabase.cpp.

References d, QWindowsFontDatabaseBase::data(), Q_UNUSED, and qCDebug.

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◆ ~QWindowsFontDatabase()

QWindowsFontDatabase::~QWindowsFontDatabase ( )

override

Definition at line 754 of file qwindowsfontdatabase.cpp.

Member Function Documentation

◆ addApplicationFont()

QStringList QWindowsFontDatabase::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 967 of file qwindowsfontdatabase.cpp.

References addFontToDatabase(), QList< T >::at(), QList< T >::count(), QString::data(), fileName, font, getFamiliesAndSignatures(), QList< T >::isEmpty(), j, populateFamily(), properties, QFontDatabasePrivate::ApplicationFont::properties, qMin(), QIODeviceBase::ReadOnly, QString::size(), QFont::StyleItalic, and QFont::StyleNormal.

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◆ createEngine()

QFontEngine * QWindowsFontDatabase::createEngine	(	const QFontDef &	request,
		const QString &	faceName,
		int	dpi,
		const QSharedPointer< QWindowsFontEngineData > &	data
	)

static

Definition at line 1138 of file qwindowsfontdatabase.cpp.

References CLEARTYPE_QUALITY, QString::data(), QFontDef::families, QWindowsFontDatabaseBase::fontDefToLOGFONT(), QWindowsFontEngineDirectWrite::fontNameSubstitute(), QFontEngine::Format_A32, QFontEngine::Format_ARGB, QString::fromWCharArray(), QFontEngine::glyphFormat, QWindowsFontEngine::initFontInfo(), QWindowsFontEngineDirectWrite::initFontInfo(), QString::length(), qCDebug, qErrnoWarning(), qMin(), qt_error_string(), qWarning, request, and QWindowsFontDatabaseBase::systemFont().

Referenced by QWindowsFontEngine::cloneWithSize(), fontEngine(), and fontEngine().

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◆ debugFormat()

void QWindowsFontDatabase::debugFormat	(	QDebug &	d,
		const LOGFONT &	lf
	)

static

Definition at line 140 of file qwindowsfontdatabase.cpp.

References d, and QString::fromWCharArray().

Referenced by operator<<(), and operator<<().

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◆ defaultFont()

QFont QWindowsFontDatabase::defaultFont ( ) const

inlineoverridevirtual

Returns the default system font.

See also: QGuiApplication::font()

Since: 5.0

Reimplemented from QPlatformFontDatabase.

Definition at line 57 of file qwindowsfontdatabase_p.h.

References QWindowsFontDatabaseBase::systemDefaultFont().

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◆ derefUniqueFont()

void QWindowsFontDatabase::derefUniqueFont ( const QString & uniqueFont )

Definition at line 1108 of file qwindowsfontdatabase.cpp.

References QMap< Key, T >::contains(), and QMap< Key, T >::remove().

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◆ ensureFamilyPopulated()

void QWindowsFontDatabase::ensureFamilyPopulated ( const QString & familyName )

◆ fallbacksForFamily()

QStringList QWindowsFontDatabase::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 1124 of file qwindowsfontdatabase.cpp.

References QWindowsFontDatabaseBase::extraTryFontsForFamily(), QPlatformFontDatabase::fallbacksForFamily(), QWindowsFontDatabaseBase::familyForStyleHint(), and qCDebug.

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◆ fontDir()

QString QWindowsFontDatabase::fontDir ( ) const

overridevirtual

Returns the directory containing the fonts used by the database.

Reimplemented from QPlatformFontDatabase.

Definition at line 1096 of file qwindowsfontdatabase.cpp.

References QPlatformFontDatabase::fontDir(), and qCDebug.

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◆ fontEngine() [1/2]

QFontEngine * QWindowsFontDatabase::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 769 of file qwindowsfontdatabase.cpp.

References QByteArray::constData(), createEngine(), QWindowsFontDatabaseBase::data(), QWindowsFontDatabaseBase::defaultVerticalDPI(), QFontEngine::DirectWrite, QFontDef::families, font, QFontEngine::fontDef, fontEngine(), QWindowsFontDatabaseBase::fontEngine(), QBasicAtomicInteger< T >::loadRelaxed(), QString::number(), QFont::PreferMatch, Q_ASSERT, Q_ASSERT_X, Q_FUNC_INFO, qCDebug, qPrintable, QT_WARNING_DISABLE_GCC, QT_WARNING_POP, QT_WARNING_PUSH, qWarning, QFontEngine::ref, request, QByteArray::size(), QFontEngine::type(), QFont::Unstretched, and QFontEngine::Win.

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◆ fontEngine() [2/2]

QFontEngine * QWindowsFontDatabase::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 759 of file qwindowsfontdatabase.cpp.

References createEngine(), QWindowsFontDatabaseBase::data(), QWindowsFontDatabaseBase::defaultVerticalDPI(), and qCDebug.

Referenced by fontEngine().

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◆ fontOptions()

unsigned QWindowsFontDatabase::fontOptions ( )

static

Definition at line 93 of file qwindowsfontdatabase.cpp.

◆ fontsAlwaysScalable()

bool QWindowsFontDatabase::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 1103 of file qwindowsfontdatabase.cpp.

◆ fontSmoothingGamma()

qreal QWindowsFontDatabase::fontSmoothingGamma ( )

static

Definition at line 98 of file qwindowsfontdatabase.cpp.

Referenced by QWindowsIntegration::styleHint().

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◆ invalidate()

void QWindowsFontDatabase::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 734 of file qwindowsfontdatabase.cpp.

◆ isPrivateFontFamily()

bool QWindowsFontDatabase::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 1245 of file qwindowsfontdatabase.cpp.

References QPlatformFontDatabase::isPrivateFontFamily().

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◆ populateFamily()

void QWindowsFontDatabase::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 640 of file qwindowsfontdatabase.cpp.

References qCDebug, QString::size(), storeFont(), and QString::toWCharArray().

Referenced by addApplicationFont(), and populateFamilyAliases().

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◆ populateFamilyAliases()

bool QWindowsFontDatabase::populateFamilyAliases ( const QString & missingFamily )

overridevirtual

Reimplemented from QPlatformFontDatabase.

Definition at line 625 of file qwindowsfontdatabase.cpp.

References QFontDatabase::families(), populateFamily(), and Q_UNUSED.

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◆ populateFontDatabase()

void QWindowsFontDatabase::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 718 of file qwindowsfontdatabase.cpp.

References QFont::families(), populateFontFamilies(), QPlatformFontDatabase::registerFontFamily(), QPlatformFontDatabase::resolveFontFamilyAlias(), and QWindowsFontDatabaseBase::systemDefaultFont().

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◆ refUniqueFont()

void QWindowsFontDatabase::refUniqueFont ( const QString & uniqueFont )

Definition at line 1118 of file qwindowsfontdatabase.cpp.

References QMap< Key, T >::contains().

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◆ releaseHandle()

void QWindowsFontDatabase::releaseHandle ( void * handle )

overridevirtual

Releases the specified font handle.

Reimplemented from QPlatformFontDatabase.

Definition at line 1090 of file qwindowsfontdatabase.cpp.

◆ setFontOptions()

void QWindowsFontDatabase::setFontOptions ( unsigned options )

static

Definition at line 87 of file qwindowsfontdatabase.cpp.

References DontUseColorFonts, and DontUseDirectWriteFonts.

Referenced by QWindowsIntegrationPrivate::parseOptions().

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The documentation for this class was generated from the following files:

qtbase/src/gui/text/windows/qwindowsfontdatabase_p.h
qtbase/src/gui/text/windows/qwindowsfontdatabase.cpp

Public Types

Public Member Functions

Static Public Member Functions

Detailed Description

Member Enumeration Documentation

◆ FontOptions

Constructor & Destructor Documentation

◆ QWindowsFontDatabase()

◆ ~QWindowsFontDatabase()

Member Function Documentation

◆ addApplicationFont()

◆ createEngine()

◆ debugFormat()

◆ defaultFont()

◆ derefUniqueFont()

◆ ensureFamilyPopulated()

◆ fallbacksForFamily()

◆ fontDir()

◆ fontEngine() [1/2]

◆ fontEngine() [2/2]

◆ fontOptions()

◆ fontsAlwaysScalable()

◆ fontSmoothingGamma()

◆ invalidate()

◆ isPrivateFontFamily()

◆ populateFamily()

◆ populateFamilyAliases()

◆ populateFontDatabase()

◆ refUniqueFont()

◆ releaseHandle()

◆ setFontOptions()