Memory usage higher with DirectWrite font database

The DirectWrite font database seems to be storing more memory per resolved font than the GDI engine. For an application that resolves all fonts (e.g. to show a font combo box) this can cause a noticeable increase in memory footprint.

The following loop to resolve all fonts on the system causes a memory footprint of 28 MB for me with DirectWrite, versus 16 MB with GDI:

    for (int i = 0; i < QFontDatabase::families().size(); ++i) {
        QFontInfo fi(QFont(QFontDatabase::families().at(i)));
        fi.family();
    }