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qt: fix threaded usage of QGraphicsScene pixmap painting

Fatih Uzunoğlu requested to merge fuzun/vlc:qt-eliminate_qgraphicsscene into master

I noticed that QGraphicsScene is not really suitable to be used under separate thread. I randomly got crashes when QGraphicsScene::render() is used in separate threads, when I was dealing with another matter. Possibly there is QPixmap painting going on internally, and it causes problems because of global caching behavior of QPixmap.

  • Use core function if the symbol is available.
  • If not available, use QGraphicsScene.
  • If current thread is not the Qt GUI thread, run the operation in Qt GUI thread.
Edited by Fatih Uzunoğlu

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