Details
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Bug
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Resolution: Fixed
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P2: Important
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5.15.11, 6.5.0 Beta3
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Windows 10
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Windows
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7a9230404 (dev), f7e2d9f59 (6.5)
Description
On Windows 10 with the Free Type font engine, if I load the stock system font "Arabic Transparent" before I load the stock system font "Arial", then "Arial" fonts will always be in italic (QFontInfo::styleName() returns "Italic" or "Narrow")
If I load the fonts in the opposite order, everything is fine:
#include <QtWidgets/QtWidgets> // NOTE: fontengine=freetype int main(int argc, char *argv[]) { QApplication a(argc, argv); #if 0 // No Bug - Works Fine qDebug() << QFontInfo(QFont("Arial")).styleName(); // prints "Regular" qDebug() << QFontInfo(QFont("Arabic Transparent")).styleName(); #else // Bug - Now All Arial Fonts Are Italic/Narrow qDebug() << QFontInfo(QFont("Arabic Transparent")).styleName(); qDebug() << QFontInfo(QFont("Arial")).styleName(); // prints "Italic" #endif return 0; }
I can see the bug occurring while loading the "Arabic Transparent" font, in the following callstack, where it loads only "Arial Italic" for the "Arial" font family and sets the Arial's QFontFamily populated to true.
EnumFontFamilesEx for "Arabic Transparent"
[(Arabic Transparent, Bold Italic)] [(Arial, Italic)] [(Arabic Transparent, Bold)] [(Arabic Transparent, Italic)] [(Arabic Transparent, Regular)]
Callstack
Qt5Guid.dll!qt_registerFont(const QString & familyName, const QString & stylename, const QString & foundryname, int weight, QFont::Style style, int stretch, bool antialiased, bool scalable, int pixelSize, bool fixedPitch, const QSupportedWritingSystems & writingSystems, void * handle) Qt5Guid.dll!QPlatformFontDatabase::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 * usrPtr) qwindowsd.dll!addFontToDatabase(QString familyName, QString styleName, const QString & fullName, const tagLOGFONTW & logFont, const tagTEXTMETRICW * textmetric, const tagFONTSIGNATURE * signature, int type) qwindowsd.dll!storeFont(const tagLOGFONTW * logFont, const tagTEXTMETRICW * textmetric, unsigned long type, __int64 lparam) gdi32full.dll!EnumFontsInternalW() gdi32full.dll!EnumFontFamiliesExW () qwindowsd.dll!QWindowsFontDatabaseFT::populateFamily(const QString & familyName) Qt5Guid.dll!QtFontFamily::ensurePopulated() Qt5Guid.dll!match(int script, const QFontDef & request, const QString & family_name, const QString & foundry_name, QtFontDesc * desc, const QList<int> & blacklistedFamilies, unsigned int * resultingScore) Qt5Guid.dll!QFontDatabase::findFont(const QFontDef & request, int script, bool preferScriptOverFamily) Qt5Guid.dll!QFontDatabase::load(const QFontPrivate * d, int script) Qt5Guid.dll!QFontPrivate::engineForScript(int script)