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  1. Qt
  2. QTBUG-93417

HighDPI: Setting setHighDpiScaleFactorRoundingPolicy() to PassThrough with fractional scaling yields cosmetic issues with QGraphicsView

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      Description

      QGraphicsScene fails to properly repaint the regions when setting QGuiApplication::setHighDpiScaleFactorRoundingPolicy(Qt::HighDpiScaleFactorRoundingPolicy::PassThrough); and using fractional scaling with 4k display.

      A way to reproduce:

      Use Qt's "Drag and Drop Robot" example project for QGraphicsView.

      Add the following lines to the very beginning of main():
      QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
      QCoreApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
      QGuiApplication::setHighDpiScaleFactorRoundingPolicy(Qt::HighDpiScaleFactorRoundingPolicy::PassThrough);

      Set the scaling for the Windows to 150%

      Build and run the application.

      Calling setViewportUpdateMode(QGraphicsView::FullViewportUpdate) on the view will remove this issue.

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              Assignee:
              sorvig Morten Sørvig
              Reporter:
              foxxx Tuukka Kettunen
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                Updated:

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