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  1. Qt
  2. QTBUG-61036

A visible QOpenGLWidget implemented with QPainter inside paintGL() crashes when QWidget::grab() is called

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    • 0265a23bb02b68534bb3c86514cc93bc45a7444f

    Description

      The attached program crashes when QOpenGLWidget::grab() is called.

       It would seem that the QPainter object created inside the paintGL() call steals internal data from the QPainter created in QWidgetPrivate::drawWidget().

      The stack trace that I get is:

      Qt5Cored.dll!qt_message_fatal(QtMsgType __formal, const QMessageLogContext & context, const QString & message) Line 1642	C++
Qt5Cored.dll!QMessageLogger::fatal(const char * msg, ...) Line 790	C++
Qt5Cored.dll!qt_assert(const char * assertion, const char * file, int line) Line 3018	C++
Qt5Guid.dll!QRasterPaintEngine::drawImage(const QRectF & r, const QImage & img, const QRectF & sr, QFlags<enum Qt::ImageConversionFlag> __formal) Line 2198	C++
Qt5Guid.dll!QPainter::drawImage(const QRectF & targetRect, const QImage & image, const QRectF & sourceRect, QFlags<enum Qt::ImageConversionFlag> flags) Line 5474	C++
Qt5Guid.dll!QPainter::drawImage(const QRect & r, const QImage & image) Line 840	C++
Qt5Widgetsd.dll!QWidgetPrivate::drawWidget(QPaintDevice * pdev, const QRegion & rgn, const QPoint & offset, int flags, QPainter * sharedPainter, QWidgetBackingStore * backingStore) Line 5601	C++
Qt5Widgetsd.dll!QWidgetPrivate::render(QPaintDevice * target, const QPoint & targetOffset, const QRegion & sourceRegion, QFlags<enum QWidget::RenderFlag> renderFlags) Line 5755	C++
Qt5Widgetsd.dll!QWidget::grab(const QRect & rectangle) Line 5251	C++
qglpainter.exe!main(int argc, char * * argv) Line 22	C++
>	qglpainter.exe!WinMain(HINSTANCE__ * __formal, HINSTANCE__ * __formal, char * __formal, int __formal) Line 123	C++
[External Code]

      Attachments

        For Gerrit Dashboard: QTBUG-61036
        # Subject Branch Project Status CR V
        196603,5 Fix crash when calling QWidget::grab() on a QOpenGLWidget 5.9 qt/qtbase Status: MERGED +2 0
        196831,2 Fix crash when calling QWidget::grab() on a QOpenGLWidget 5.6 qt/qtbase Status: MERGED +2 0

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          People

            iamsergio Sergio Martins
            chrisburel Chris Burel
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            Dates

              Created:
              Updated:
              Resolved:

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