The QFontInfo class provides general information about fonts. ... QFontInfo  ( const QFont & )  . ... The QFont class might not always map exactly to the specified font for a paint device. The QFontInfo class provides information of the actual font that matched a QFont specification. ... The QFontInfo constructor with a QFont creates a font info object for a screen-compatible font, i.e. the font must not be a printer font. QWidget::fontInfo () returns the font info for a widget's current font. ...