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Internal/Contributor docs for the Qt SDK. <b>Note:</b> These are NOT official API docs; those are found <a href='https://doc.qt.io/'>here</a>.
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Font database for Windows. More...
#include <qwindowsfontdatabase_p.h>
Classes | |
struct | FontHandle |
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 | removeApplicationFonts () |
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. | |
void | invalidate () override |
This function is called whenever the font database is invalidated. | |
QFontDef | sanitizeRequest (QFontDef request) const |
Public Member Functions inherited from QPlatformFontDatabase | |
virtual | ~QPlatformFontDatabase () |
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 | resolveFontFamilyAlias (const QString &family) const |
Resolve alias to actual font family names. | |
virtual QList< int > | standardSizes () const |
Return list of standard font sizes when using this font database. | |
virtual bool | supportsVariableApplicationFonts () const |
Returns true if this font database supports loading named instances from variable application fonts. | |
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. | |
Font database for Windows.
Definition at line 31 of file qwindowsfontdatabase_p.h.
Enumerator | |
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DontUseDirectWriteFonts | |
DontUseColorFonts |
Definition at line 35 of file qwindowsfontdatabase_p.h.
QWindowsFontDatabase::QWindowsFontDatabase | ( | ) |
Definition at line 720 of file qwindowsfontdatabase.cpp.
References d, QWindowsFontDatabaseBase::data(), Q_UNUSED, and qCDebug.
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override |
Definition at line 735 of file qwindowsfontdatabase.cpp.
References removeApplicationFonts().
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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.
Reimplemented from QPlatformFontDatabase.
Definition at line 992 of file qwindowsfontdatabase.cpp.
References addFontToDatabase(), QString::append(), QString::data(), fileName, font, getFamiliesAndSignatures(), j, populateFamily(), properties, qMin(), QIODeviceBase::ReadOnly, QString::size(), QFont::StyleItalic, and QFont::StyleNormal.
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static |
Definition at line 1179 of file qwindowsfontdatabase.cpp.
References CLEARTYPE_QUALITY, QFontDef::families, QWindowsFontDatabaseBase::fontDefToLOGFONT(), QWindowsFontEngineDirectWrite::fontNameSubstitute(), QFontEngine::Format_A32, QString::fromWCharArray(), qCDebug, qErrnoWarning(), qMin(), qt_error_string(), qWarning, request, and QWindowsFontDatabaseBase::systemFont().
Referenced by QWindowsFontEngine::cloneWithSize(), fontEngine(), and fontEngine().
Definition at line 141 of file qwindowsfontdatabase.cpp.
References d, and QString::fromWCharArray().
Referenced by operator<<(), and operator<<().
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inlineoverridevirtual |
Returns the default system font.
Reimplemented from QPlatformFontDatabase.
Definition at line 59 of file qwindowsfontdatabase_p.h.
Definition at line 1145 of file qwindowsfontdatabase.cpp.
References QMap< Key, T >::end(), QMap< Key, T >::erase(), QMap< Key, T >::find(), it, and lock.
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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 1165 of file qwindowsfontdatabase.cpp.
References QWindowsFontDatabaseBase::extraTryFontsForFamily(), QPlatformFontDatabase::fallbacksForFamily(), QWindowsFontDatabaseBase::familyForStyleHint(), and qCDebug.
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overridevirtual |
Returns the directory containing the fonts used by the database.
Reimplemented from QPlatformFontDatabase.
Definition at line 1133 of file qwindowsfontdatabase.cpp.
References QPlatformFontDatabase::fontDir(), and qCDebug.
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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 751 of file qwindowsfontdatabase.cpp.
References createEngine(), QWindowsFontDatabaseBase::data(), QWindowsFontDatabaseBase::defaultVerticalDPI(), QFontEngine::DirectWrite, QFontDef::families, font, QFontEngine::fontDef, fontEngine(), QWindowsFontDatabaseBase::fontEngine(), QBasicAtomicInteger< T >::loadRelaxed(), lock, 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, QFontEngine::type(), QFont::Unstretched, and QFontEngine::Win.
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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 740 of file qwindowsfontdatabase.cpp.
References createEngine(), QWindowsFontDatabaseBase::data(), QWindowsFontDatabaseBase::defaultVerticalDPI(), QString::left(), and qCDebug.
Referenced by fontEngine(), and QWindowsDirectWriteFontDatabase::fontEngine().
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static |
Definition at line 94 of file qwindowsfontdatabase.cpp.
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overridevirtual |
Return true if all fonts are considered scalable when using this font database.
Defaults to false.
Reimplemented from QPlatformFontDatabase.
Definition at line 1140 of file qwindowsfontdatabase.cpp.
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static |
Definition at line 99 of file qwindowsfontdatabase.cpp.
Referenced by QWindowsIntegration::styleHint().
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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 714 of file qwindowsfontdatabase.cpp.
References QWindowsFontDatabaseBase::invalidate(), and removeApplicationFonts().
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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 1286 of file qwindowsfontdatabase.cpp.
References QPlatformFontDatabase::isPrivateFontFamily().
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 620 of file qwindowsfontdatabase.cpp.
References qCDebug, QString::size(), storeFont(), and QString::toWCharArray().
Referenced by addApplicationFont(), addFontToDatabase(), QWindowsDirectWriteFontDatabase::populateFamily(), and populateFamilyAliases().
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overridevirtual |
Reimplemented from QPlatformFontDatabase.
Definition at line 605 of file qwindowsfontdatabase.cpp.
References QFontDatabase::families(), populateFamily(), and Q_UNUSED.
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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 698 of file qwindowsfontdatabase.cpp.
References populateFontFamilies(), QPlatformFontDatabase::registerFontFamily(), QPlatformFontDatabase::resolveFontFamilyAlias(), and QWindowsFontDatabaseBase::systemDefaultFont().
Definition at line 1157 of file qwindowsfontdatabase.cpp.
References QMap< Key, T >::end(), QMap< Key, T >::find(), it, and lock.
Releases the specified font handle.
Reimplemented from QPlatformFontDatabase.
Definition at line 1128 of file qwindowsfontdatabase.cpp.
void QWindowsFontDatabase::removeApplicationFonts | ( | ) |
Definition at line 1101 of file qwindowsfontdatabase.cpp.
References QList< T >::clear(), and font.
Referenced by ~QWindowsFontDatabase(), and invalidate().
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static |
Definition at line 88 of file qwindowsfontdatabase.cpp.
References DontUseColorFonts, and DontUseDirectWriteFonts.
Referenced by QWindowsIntegrationPrivate::parseOptions().