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  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

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    • Platform/s:
      macOS

      Description

      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.

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          Issue Links

          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-75827 [REG: 5.9 -> 5.12][macOS] Black window is shown on 10.14 Mojave when set "transparent" in color property

          • P3: Somewhat important - Should be fixed, but doesn't affect the release in any way.
          • Closed
          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-60822 [REG: 4->5] WA_TranslucentBackground cannot be changed after widget has been shown

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-75827 [REG: 5.9 -> 5.12][macOS] Black window is shown on 10.14 Mojave when set "transparent" in color property

          • P3: Somewhat important - Should be fixed, but doesn't affect the release in any way.
          • Closed
          resulted in

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-80508 QSGGuiThreadRenderLoop uses single context for all windows

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed
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              Assignee:
              vestbo Tor Arne Vestbø
              Reporter:
              andysh Andy Shaw
              Votes:
              7 Vote for this issue
              Watchers:
              7 Start watching this issue

                Dates

                Created:
                Updated:
                Resolved:

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