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  1. Qt
  2. QTBUG-62840

Running into unreachable code on BGR888 displays

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    Description

      Some X severs seems to default to BGR888 visuals which cause Qt applications to abort. Running a Qt application on such causes (Qt Designer in this case):

      QXcbConnection: Failed to initialize XRandr
Qt: XKEYBOARD extension not present on the X server.
QXcbIntegration: Cannot create platform OpenGL context, neither GLX nor EGL are enabled
ASSERT failure in Q_UNREACHABLE(): "Q_UNREACHABLE was reached", file /home/user/work/qt/git/qtbase/src/gui/image/qimage_p.h, line 132
Aborted (core dumped)

      Can be reproduced at least with vnc4server (under that name in Ubuntu repos) and:

      vncsever -pixelformat bgr888 &
QT_XCB_GL_INTEGRATION=none DISPLAY=:1 ./designer

      This almost works with Qt 5.10 when QT_XCB_NATIVE_PAINTING=1 is set and also with Qt 4. In these cases it can display the Designer just fine.

      Attachments

        1. gdb.txt
          3 kB
        2. qtdiag.txt
          6 kB
        3. xdpyinfo.txt
          3 kB

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            vgt Eirik Aavitsland
            poikelin Joni Poikelin
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            Dates

              Created:
              Updated:
              Resolved: