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  1. Qt
  2. QTBUG-77637

macOS: not possible to make QWindow background transparent

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    • macOS
    • ee82f866152a27ef7a0d69f3aa41608d4a058610 (qt/qtbase/5.12)

      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.

        1. linux.png
          linux.png
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        2. macos.png
          macos.png
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        3. rasterwindow.zip
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        For Gerrit Dashboard: QTBUG-77637
        # Subject Branch Project Status CR V
        271303,5 macOS: Don't ask for a NSWindow background unless we need one 5.12 qt/qtbase Status: MERGED +2 0
        273960,4 macOS: Keep default NSWindow background unless window is frameless 5.14 qt/qtbase Status: MERGED +2 0
        274055,2 macOS: Keep default NSWindow background unless window is frameless 5.12 qt/qtbase Status: MERGED +2 0

            vestbo Tor Arne Vestbø
            e.nemtsev Egor Nemtsev
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              Created:
              Updated:
              Resolved:

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