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  1. Qt
  2. QTBUG-77637

macOS: not possible to make QWindow background transparent

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    Details

    • Platform/s:
      macOS
    • Commits:
      ee82f866152a27ef7a0d69f3aa41608d4a058610 (qt/qtbase/5.12)

      Description

      When using QBackingStore to render raster in QWindow on Linux it is enough to add to constructor of child class of QWindow (as described in docs https://doc.qt.io/qt-5/qwindow.html#setFormat) :

      {
         ...
      
         QSurfaceFormat fmt = format(); 
         fmt.setAlphaBufferSize(8); 
         setFormat(fmt);
      
         create();
      
         ...
         //new QBackingStore(this)
      }

      and background becomes transparent.

      On MacOS with the same code it is filled with gray color.

        Attachments

        1. linux.png
          linux.png
          21 kB
        2. macos.png
          macos.png
          21 kB
        3. rasterwindow.zip
          9 kB

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              People

              • Assignee:
                vestbo Tor Arne Vestbø
                Reporter:
                e.nemtsev Egor Nemtsev
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                Dates

                • Created:
                  Updated:
                  Resolved:

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