[Qt-interest] QPixmap: It is not safe to use pixmaps outside the GUI thread

[Penn Taylor]

I have an application that runs a Qt app in a separate thread, renders 
the Qt app to a QImage, and then uses the QImage as a texture in an 
OpenScenegraph app running back in the main thread. This warning 
(error?) is printed out to the console with every frame:

QPixmap: It is not safe to use pixmaps outside the GUI thread

I'm not explicitly using QPixmaps anywhere, and I notice that my dialogs 
don't render correctly. The frame around buttons is missing, etc. What 
does the warning mean? Is it the source of the missing button frames? Is 
this just Qt's internal implicit sharing biting me?

Any help would be appreciated.

-Penn Taylor