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  1. Qt
  2. QTBUG-106026

Performance/clipping issue (MacOs only + Qt6 only)

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Details

    • Bug
    • Resolution: Done
    • P2: Important
    • None
    • 6.x
    • GUI: Graphics Performance
    • None
    • macOS

    Description

      On MacOS (tested with 10.11 and 10.12) it seems the entire windows/container is repainted despite only a child widget must be repainted.
      This behavior decrease the performance of the whole application when the graphic container is maximized or enlarged (some       events are even lost)
      I      n the mini project attached, while the white widget has a small fixed size, its refresh rate decreases when the widget container is enlarged.Tested on MacOs 10.12.4 and 10.12.5.
      The bug doesn't occur with Qt5.15.2.
      My guess is there is an issue with clipping information (which is correctly passed with Qt 5 and not with Qt 6)

      Attachments

        1. QtPaintFPS.zip
          2 kB
          Sebastien Leon
        2. window_and_backingstore.log
          45 kB
          Luc Vainpress

        Issue Links

          duplicates

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-99297 Performance issue with image painting on Mac

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

            People

              vestbo Tor Arne Vestbø
              sleon Sebastien Leon
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              Dates

                Created:
                Updated:
                Resolved:

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