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  1. Qt
  2. QTBUG-132430

Everything says "setHighDpiScaleFactorRoundingPolicy must be called before creating the QGuiApplication instance"

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    • Icon: Bug Bug
    • Resolution: Fixed
    • Icon: P3: Somewhat important P3: Somewhat important
    • 6.10.0 FF
    • 6.9
    • GUI: High-DPI
    • None
    • 7c69d0926 (dev)

      Just run any Qt application, it'll say that. With debug:

      qt.highdpi: Initializing high-DPI scaling
qt.highdpi: environment variable set: QT_SCALE_FACTOR_ROUNDING_POLICY "Floor"
setHighDpiScaleFactorRoundingPolicy must be called before creating the QGuiApplication instance

      Environment:

      QT_AUTO_SCREEN_SCALE_FACTOR=0
QT_SCALE_FACTOR_ROUNDING_POLICY=Floor

      Backtrace of the warning:

      #7  0x00007ffff65090e0 in QMessageLogger::warning (this=0x7fffffffd380, 
    msg=0x7ffff7b1f140 "setHighDpiScaleFactorRoundingPolicy must be called before creating the QGuiApplication instance")
    at /home/tjmaciei/src/qt/qt6/qtbase/src/corelib/global/qlogging.cpp:631
#8  0x00007ffff724222c in QGuiApplication::setHighDpiScaleFactorRoundingPolicy (policy=Qt::HighDpiScaleFactorRoundingPolicy::Floor)
    at /home/tjmaciei/src/qt/qt6/qtbase/src/gui/kernel/qguiapplication.cpp:4011
#9  0x00007ffff7264f28 in QHighDpiScaling::initHighDpiScaling () at /home/tjmaciei/src/qt/qt6/qtbase/src/gui/kernel/qhighdpiscaling.cpp:454
#10 0x00007ffff7237075 in QGuiApplicationPrivate::createPlatformIntegration (this=0x55555558d1a0)
    at /home/tjmaciei/src/qt/qt6/qtbase/src/gui/kernel/qguiapplication.cpp:1499
#11 0x00007ffff7237e65 in QGuiApplicationPrivate::createEventDispatcher (this=0x55555558d1a0) at /home/tjmaciei/src/qt/qt6/qtbase/src/gui/kernel/qguiapplication.cpp:1617
#12 0x00007ffff65e8ef5 in QCoreApplicationPrivate::init (this=0x55555558d1a0) at /home/tjmaciei/src/qt/qt6/qtbase/src/corelib/kernel/qcoreapplication.cpp:878
#13 0x00007ffff7237f83 in QGuiApplicationPrivate::init (this=0x55555558d1a0) at /home/tjmaciei/src/qt/qt6/qtbase/src/gui/kernel/qguiapplication.cpp:1645
#14 0x00007ffff7231718 in QGuiApplication::QGuiApplication (this=0x7fffffffd9b0, argc=@0x7fffffffd99c: 1, argv=0x7fffffffdb50)
    at /home/tjmaciei/src/qt/qt6/qtbase/src/gui/kernel/qguiapplication.cpp:651

        For Gerrit Dashboard: QTBUG-132430
        # Subject Branch Project Status CR V
        631734,4 highdpi: avoid rounding policy warning dev qt/qtbase Status: MERGED +2 0

            sorvig Morten Sørvig
            thiago Thiago Macieira
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              Created:
              Updated:
              Resolved:

                There are no open Gerrit changes