Sometimes my application crashes in QWidget::update() that is performing in non-GUI thread.
I am developing an application in which receives video frames from remote host and display them on QWidget.
For this purpose I use libVLC library that gives to me a decoded image. I receive image in libVLC callback, that is performing in separate libVLC thread. In this callback I'm trying to perform QWidget::update() method. Sometimes application crashes, and callstack is somewhere in this method. Here is the my callback code:
I know that GUI operations outside the main thread are not allowed in Qt. But according documentation QWidget::update() just schedules a paint event for processing when Qt returns to the main event loop and does not cause an immediate repaint.cpp Code:
void VideoWidget::displayCB(void* picture) { QImage* image = reinterpret_cast<QImage*>(picture); onScreenPixmapMutex_.lock(); onScreenPixmap_ = QImage(*image); onScreenPixmap_.detach(); onScreenPixmapMutex_.unlock(); delete image; update(); }To copy to clipboard, switch view to plain text mode
The questtion is: is the rule "GUI operations outside the main thread are not allowed" appliable for QWidget::update()? Does this operation belongs to "GUI operations"?
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