Windows Display 125% scaling : Video is rendered to an incorrect rect

[gt4317]

The video is not rendered to the correct rect.
QtAV, Official Sample, sampleplayer
Windows 10, QT 5.15.2 mingw32

For supporting non integer sclae factor on windows
E.g. Set Windows / Setting / Display / Scale and Layout to 125% or 175%

You need to set Qt::HighDpiScaleFactorRoundingPolicy::PassThrough to highDpiScaleFactorRoundingPolicy like this :

int main(int argc, char *argv[]) {
    QApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
    QGuiApplication::setHighDpiScaleFactorRoundingPolicy(Qt::HighDpiScaleFactorRoundingPolicy::PassThrough);
    QtAV::Widgets::registerRenderers();
    QApplication a(argc, argv);
    PlayerWindow player;
    player.show();
    player.resize(800, 600);
    return a.exec();
}

In above situation, if you drag player window between two screen which have the different display scale setting. It will be rendered to an incorrect rect like this:

[gt4317]

I found the reason is in QtAV\widgets\OpenGLWidgetRenderer.cpp line 67

const qreal dpr = context()->screen()->devicePixelRatio();

context()->screen() to get the screen which this widget is created on.
If you have two monitor and set them to different Display Scale Factor, It can't work.
I changed this line to :

const qreal dpr = devicePixelRatioF();

The Problem solved.
Mybe other renders have the same problem. but I just use this one.
Mybe someone or author can make a commit to fix it.
:)