Embedding custom fonts in Qt 4.8.4



  • Hello,
    we have problems embedding fonts in our application using QFontDatabase::addApplicationFontFromData:

    @ QStringList list;
    QFontDatabase::removeAllApplicationFonts();
    list << "qdsFont1.ttf" << "qdsFont2.ttf" << "qdsFont3.ttf" << "qdsFont4.ttf";
    int fontID(-1);
    bool fontWarningShown(false);
    for (QStringList::const_iterator constIterator = list.constBegin(); constIterator != list.constEnd(); ++constIterator) {
    QFile res(":/polices/" + *constIterator);
    if (res.open(QIODevice::ReadOnly) == false) {
    if (fontWarningShown == false) {
    QMessageBox::warning(0, argv[0], (QString)"Impossible to open font file " + QChar(0x00AB) + *constIterator + QChar(0x00BB) + ".");
    fontWarningShown = true;
    }
    } else {
    fontID = QFontDatabase::addApplicationFontFromData(res.readAll());
    if (fontID == -1 && fontWarningShown == false) {
    QMessageBox::warning(0, argv[0], (QString)"Impossible to load " + QChar(0x00AB) + *constIterator + QChar(0x00BB) + ".");
    fontWarningShown = true;
    }
    QStringList fntList = QFontDatabase::applicationFontFamilies ( fontID );
    for (QStringList::const_iterator constIt = fntList.constBegin(); constIt != fntList.constEnd(); ++constIt) {
    qDebug() << argv[0] << "QFont=" << *constIterator << "QFont=" << *constIt;
    }
    }
    }
    a.setFont(QFont("qdsFont1"),13);

    #define FUNCIDENT "main"
    int ps=13;
    QString str="qdsfont1";
    QFont testFont(str,ps);
    qDebug() << FUNCIDENT << "font=" << str << "pointsize=" << ps;
    QFontInfo info(testFont);
    qDebug() << FUNCIDENT << "font=" << info.family() << "pixelsize=" << info.pointSize() << info.pixelSize() << info.weight() << info.exactMatch();
    @

    The fonts are stored in a qt resource file.

    a.setFont() does not work. ( QApplication a(argc, argv); )

    After creating the testFont QFontInfo allways tells me, that Arial is used, not my own font.

    Qt 4.8.4 / Linux
    created with
    @/opt/qt-4.8.4-src/configure --prefix=/opt/qt-4.8.4-i386 --platform=linux-g++-32 -no-glib
    -nomake demos -nomake examples -confirm-license -opensource -no-openssl -no-opengl -no-nis
    -xinput -no-cups -no-dbus -no-webkit -xrender -fontconfig
    @
    ldd shows me that the application uses these libs:
    @ linux-gate.so.1 => (0xffffe000)
    libqwt.so.6 => /opt/qwt-6.0.2/lib/libqwt.so.6 (0xb7e40000)
    libqdswidget.so => /home/qdsemu/qdsemu/home/lib/libqdswidget.so (0xb7d0a000)
    libqdsemu.so.1.0.6 => /home/qdsemu/qdsemu/home/lib/libqdsemu.so.1.0.6 (0xb7d03000)
    libitp.so => /home/qdsemu/qdsemu/home/lib/libitp.so (0xb7cfd000)
    libXi.so.6 => /usr/X11R6/lib/libXi.so.6 (0xb7cdf000)
    libQt3Support.so.4 => /opt/qt-4.8.4-i386/lib/libQt3Support.so.4 (0xb79ee000)
    libQtSql.so.4 => /opt/qt-4.8.4-i386/lib/libQtSql.so.4 (0xb79ad000)
    libQtXml.so.4 => /opt/qt-4.8.4-i386/lib/libQtXml.so.4 (0xb7965000)
    libQtNetwork.so.4 => /opt/qt-4.8.4-i386/lib/libQtNetwork.so.4 (0xb783a000)
    libQtGui.so.4 => /opt/qt-4.8.4-i386/lib/libQtGui.so.4 (0xb6d17000)
    libQtCore.so.4 => /opt/qt-4.8.4-i386/lib/libQtCore.so.4 (0xb6a0a000)
    libpthread.so.0 => /lib/libpthread.so.0 (0xb69f4000)
    libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0xb6910000)
    libm.so.6 => /lib/libm.so.6 (0xb68eb000)
    libgcc_s.so.1 => /lib/libgcc_s.so.1 (0xb68e0000)
    libc.so.6 => /lib/libc.so.6 (0xb67b3000)
    libQtSvg.so.4 => /opt/qt-4.8.4-i386/lib/libQtSvg.so.4 (0xb675a000)
    librt.so.1 => /lib/librt.so.1 (0xb6751000)
    libXext.so.6 => /usr/X11R6/lib/libXext.so.6 (0xb6743000)
    libX11.so.6 => /usr/X11R6/lib/libX11.so.6 (0xb664c000)
    libz.so.1 => /lib/libz.so.1 (0xb6639000)
    libpng12.so.0 => /usr/lib/libpng12.so.0 (0xb6615000)
    libfreetype.so.6 => /usr/lib/libfreetype.so.6 (0xb65a8000)
    libSM.so.6 => /usr/X11R6/lib/libSM.so.6 (0xb659f000)
    libICE.so.6 => /usr/X11R6/lib/libICE.so.6 (0xb6587000)
    libXrender.so.1 => /usr/X11R6/lib/libXrender.so.1 (0xb657f000)
    libfontconfig.so.1 => /usr/lib/libfontconfig.so.1 (0xb6545000)
    libdl.so.2 => /lib/libdl.so.2 (0xb6541000)
    /lib/ld-linux.so.2 (0xb7f2d000)
    libexpat.so.1 => /usr/lib/libexpat.so.1 (0xb6522000)@



  • If you have your TTF's in a resource why use addApplicationFontFromData() at all? Why not simply do:

    @
    QFontDatabase.addApplicationFont(':/polices/qdsFont1.ttf')
    @

    I successfully add 10+ custom fonts to my application this way.

    Hope this helps ;o)



  • Well, that makes no difference:
    @ QStringList list;
    QFontDatabase::removeAllApplicationFonts();
    list << "qdsFont1.ttf" << "qdsFont2.ttf" << "qdsFont3.ttf" << "qdsFont4.ttf";
    int fontID(-1);
    bool fontWarningShown(false);
    for (QStringList::const_iterator constIterator = list.constBegin(); constIterator != list.constEnd(); ++constIterator) {
    QString res(":/polices/" + *constIterator);
    fontID = QFontDatabase::addApplicationFont(res);
    if (fontID == -1 && fontWarningShown == false) {
    QMessageBox::warning(0, argv[0], (QString)"Impossible to load " + QChar(0x00AB) + *constIterator + QChar(0x00BB) + ".");
    fontWarningShown = true;
    }
    QStringList fntList = QFontDatabase::applicationFontFamilies ( fontID );
    for (QStringList::const_iterator constIt = fntList.constBegin(); constIt != fntList.constEnd(); ++constIt) {
    qDebug() << argv[0] << "QFont=" << *constIterator << "QFont=" << *constIt;
    }
    }
    a.setFont(QFont("qdsFont1"),13);

    #define FUNCIDENT "main"
    int ps=13;
    QString str="qdsFont1";
    QFont testFont(str);
    qDebug() << FUNCIDENT << "font=" << str << "pointsize=" << ps;
    QFontInfo info(testFont);
    qDebug() << FUNCIDENT << "font=" << info.family() << "pixelsize=" << info.pointSize() << info.pixelSize() << info.weight() << info.exactMatch();
    @
    The shortened output of my program:
    @QFont= "qdsFont1.ttf" QFont= "qdsFont1"
    QFont= "qdsFont2.ttf" QFont= "qdsFont2"
    QFont= "qdsFont3.ttf" QFont= "qdsFont3"
    QFont= "qdsFont4.ttf" QFont= "qdsFont4"
    font= "qdsFont1" pointsize= 13
    font= "Arial" pixelsize= 12 12 50 false
    @

    As you can see:

    • fonts are added to the application
    • font is not used

  • Lifetime Qt Champion

    Hi,

    Are you sure your font family name is correct ?



  • [quote author="SGaist" date="1371123158"]Hi,

    Are you sure your font family name is correct ?[/quote]

    This must be correct because its being returned by QFontDatabase::applicationFontFamilies() for fontID.

    Is a point size of 13 available with your font? Maybe try one of the standard sizes as returned by QFontDatabase::standardSizes(). I remember this being an issue for me as MacOSX seems to default to 13pt and I had to override it to 12pt to prevent errors with font widgets.

    Hope this helps ;o)



  • I did not specify a point size, when creating the font ( QFont testFont(str); ).
    Nevertheless the point size of font 1 is 13.



  • No, but you do when settings the application font.

    Anywho, stupid question, but I take it that the fonts you are loading are proven to work elsewhere? The only reason I ask is because I have just run all the steps that you have with a number of different TTF's and I can't reproduce the problem. If the fonts are freely available somewhere I can try my tests with the actual TTF's.



  • Well, actually the origin for my fonts are *.fon files (windows font format).
    I had to translate them to ttf using fontforge.
    I have no problem sending you one of these fontfiles.


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