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  1. Qt
  2. QTBUG-63943

[REG 5.9.1->5.9.2] HiDPI: Horizontal/vertical lines visible when moving windows over Qt application

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: P1: Critical
    • Resolution: Done
    • Affects Version/s: 5.9.2
    • Fix Version/s: 5.9
    • Component/s: GUI: Painting
    • Labels:
      None
    • Environment:
      Linux/X11, compositor disabled

      Windows 7, Aero disabled

      Description

      Since 5138fada0b9ce3968b23ec11df5f0d4e67544c43 HiDPI mode has rounding errors on expose events. When moving a window over a Qt applications window with HiDPI scaling, vertical and/or horizontal lines (borders from moved window) are visible (attached movies with scale 2.0 and 2.12). The bottom and/or right border of expose rectangle is not repainted due to rounding error.

      Example - my idea what can be wrong:

      We have a rect: x = 0.5, y = 0.5, w = 6.5, h = 5.0
      Now we round it (floor/ceil): x = 0, y = 0, w = 7, h = 5 (bottom line is not repainted)
      But we expect: x = 0, y = 0, w = 7, h = 6
      

        Attachments

        1. scale-2.0.mp4
          4.29 MB
        2. scale-2.12.mp4
          3.35 MB
        3. Win7.png
          Win7.png
          493 kB
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          Activity

            People

            Assignee:
            vestbo Tor Arne Vestbø
            Reporter:
            zaps166 Błażej Szczygieł
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              Dates

              Created:
              Updated:
              Resolved:

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