Il 05/05/2017 09:05, maitai ha scritto:
But still, I have hundreds of other QPixmaps used in threads, with no problem at all (creating, painting, etc). All is working fine for years, without any warning or so from Qt.
Well, not having problems doesn't imply that what you were doing was correct...
Should I change also all these QPixmaps to QImages (with a conversion cost at the end of the threads)?
Yes. Note that the conversion cost may be extremely small: QPixmap these days is simply holding a QImage in the "right format" for display. If your QImage is already in that format, only a cheap refcount increase is needed, not a full format conversion.
If QPixmaps are forbidden outside the main GUI thread, why is it not written in the documentation?
It is implied by the lack of "This class is reentrant" note in QPixmap documentation. It's also documented that way in other places, like
http://doc.qt.io/qt-5/thread-basics.html See also slides 27+
https://conf.qtcon.org/system/attachments/104/original/multithreading-with-qt.pdf?1473018682
Cheers, -- Giuseppe D'Angelo | giuseppe.dang...@kdab.com | Senior Software Engineer KDAB (UK) Ltd., a KDAB Group company | Tel: UK +44-1625-809908 KDAB - Qt, C++ and OpenGL Experts
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