Uploaded image for project: 'Qt'
  1. Qt
  2. QTBUG-75101

When a window is has a transparent background then it will not be rendered correctly and will be rendered black instead

XMLWordPrintable

    • macOS

      When a window is has a transparent background then it will not be rendered correctly and will be rendered black instead.

      In the example attached, there are two approaches to reproducing this, one is to set a transparent background on a Window that is shown above the other. This will show the problem some of the time, but not every time and can be worked around by using:

          QSurfaceFormat format;
    format.setAlphaBufferSize(8);
    QSurfaceFormat::setDefaultFormat(format);

      The other approach which is commented out in the first Window is to change the background color from transparent to a solid white, this will then cause the second Window to have black instead of transparent pixels then.

      Update: The workaround will cause other problems when on macOS 10.13 and having text that has an alpha channel, so depending on the setup, the workaround may or may not be viable.

        1. qtbug75101.tar.gz
          1 kB
        No reviews matched the request. Check your Options in the drop-down menu of this sections header.

            vestbo Tor Arne Vestbø
            andysh Andy Shaw
            Votes:
            7 Vote for this issue
            Watchers:
            8 Start watching this issue

              Created:
              Updated:
              Resolved:

                There are no open Gerrit changes