[Development] Can QImage format plugins require QGuiApplication?

Giuseppe D'Angelo giuseppe.dangelo at kdab.com
Tue Apr 14 01:25:00 CEST 2020

Il 13/04/20 18:50, Kevin Kofler ha scritto:
> Today, a user on #fedora-kde ran across a crash which resulted from:
> * a GTK+/GNOME application (Jami) using (for some reason) QImage to load
>    images, without a QGuiApplication or QApplication constructed, vs.
> * a QImage format plugin (QtPBFImagePlugin) using font APIs that require
>    QGuiApplication and abort otherwise.
> Obviously, one or the other must be wrong. So, who is to blame?

The golden rule is that you're not allowed to touch any Qt API without 
creating a Q*Application object first, unless the documentation says 

Giuseppe D'Angelo | giuseppe.dangelo at kdab.com | Senior Software Engineer
KDAB (France) S.A.S., a KDAB Group company
Tel. France +33 (0)4 90 84 08 53, http://www.kdab.com
KDAB - The Qt, C++ and OpenGL Experts

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