QFontDatabase::addApplicationFont works in Embedded Linux, but not in Linux Ubuntu

[Momergil]

Hi!

I have an app developed with Qt 4.8 compiled for both Embedded Linux Arm as well as Linux Ubuntu. It uses a specific set of fonts which I need to have installed for it to run, something I do with QFontDatabase::addApplicationFont. Everything works fine when I compile for Embedded Linux, but when I do it for Linux Ubuntu, I got -1 and the fonts are not loaded.

I tried to find on the web a solution for the problem but I found no help. Similar problems were solved by updating Qt 4.6 to 4.7 (nothing of use) or by installing fontconfig, which I already have. Also I couldn't find anything useful in Qt Assistant and checked the paths to the .ttf files.

Any help will be appreciated.

Here is the code I'm using:

QFontDatabase::removeAllApplicationFonts();
 
    QDir fontDir(DEFAULT_FONTS_PATH);
    QStringList fontFileList = fontDir.entryList(QStringList("*.ttf"), QDir::Files | QDir::NoDotDot | QDir::NoDot);
 
    mDebugS(QString("Found %1 fonts on folder theme/fonts").arg(fontFileList.size()));
 
    //
    qint32 fontId;
 
    foreach (const QString& filename, fontFileList)
    {
        fontId = QFontDatabase::addApplicationFont(DEFAULT_FONTS_PATH "/" + filename);
 
        if (Q_UNLIKELY(fontId == -1))
        {
            const QString strTemp = QString("Unable to install font %1").arg(filename);
 
            mLog(strTemp);
            mDebugS(strTemp);
        }
        else
            applicationFontsIdList.append(fontId);
    }
 
    mDebugS(QString::number(applicationFontsIdList.size()) + " fonts are installed");

QFontDatabase::removeAllApplicationFonts();

    QDir fontDir(DEFAULT_FONTS_PATH);
    QStringList fontFileList = fontDir.entryList(QStringList("*.ttf"), QDir::Files | QDir::NoDotDot | QDir::NoDot);

    mDebugS(QString("Found %1 fonts on folder theme/fonts").arg(fontFileList.size()));

    //
    qint32 fontId;

    foreach (const QString& filename, fontFileList)
    {
        fontId = QFontDatabase::addApplicationFont(DEFAULT_FONTS_PATH "/" + filename);

        if (Q_UNLIKELY(fontId == -1))
        {
            const QString strTemp = QString("Unable to install font %1").arg(filename);

            mLog(strTemp);
            mDebugS(strTemp);
        }
        else
            applicationFontsIdList.append(fontId);
    }

    mDebugS(QString::number(applicationFontsIdList.size()) + " fonts are installed");

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Note: the same question was put in StackOverflow (link)

[Momergil]

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