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  1. Qt
  2. QTBUG-67249

QML Timer with Animation still running too fast on Windows

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    • Icon: Bug Bug
    • Resolution: Duplicate
    • Icon: P1: Critical P1: Critical
    • None
    • 5.10.1
    • Quick: SceneGraph
    • None
    • Qt 5.10.1 MinGW / MSVC

      Qt Creator 4.5.1

      Windows 10

      The timer bug https://bugreports.qt.io/browse/QTBUG-42699 was fixed in Qt 5.5.

      However on Qt 5.10.1, Timers still seem to run 1 or more frames / second too fast, if Animations are used.

      Example code:

      
import QtQuick 2.3
import QtQuick.Window 2.0

Window {

    Timer {
        property var lastTime
        interval: 1000
        running: true
        repeat: true
        onTriggered: {
            if (lastTime) {
                console.log(Date.now() - lastTime);
            }
            lastTime = Date.now();
        }
    }

    property int a
    SequentialAnimation on a {
        loops: Animation.Infinite
        NumberAnimation { from: 0; to: 1; duration: 1000 }
    }
}

      Prints:

      
qml: 929
qml: 960
qml: 944
qml: 944
qml: 943

      Adding the QSG_RENDER_LOOP=basic fixes the problem. But this makes AnimatedSprite's performance wors (runs at 40FPS when used)

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            janichol Andy Nichols
            Chrisu Christian Bartsch
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            3 Vote for this issue
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              Created:
              Updated:
              Resolved:

                There are no open Gerrit changes