On woensdag 12 juni 2019 08:01:19 CEST Elias Mårtenson wrote: > I am a developer for the McCLIM <https://github.com/McCLIM/McCLIM> graphics > toolkit, and I would like it to be able to integrate better with KDE. > > Currently, McCLIm has a hardcoded font scale which is problematic when on a > high DPI screen. It's possible for a user to customise it but recomputing > the default fonts, but that's not ideal. > > What I'd like to do is to read the KDE "Force Fonts DPI" setting, and use > it to automatically compute the new font sizes. However, it's unclear to me > how this value is propagated to applications. There must be a standard for > this, since a lot of applications is able to pick it up, but I haven't been > able to figure it out. > > What is the proper way to read this value?
The proper way to support HiDPI is not by messing with font sizes. You set the hidpi flag: QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling); Before you create your QApplication instance, and you make sure pixmaps are available in normal 2x sizes. HiDPI support in Qt isn't that great, though, fractional scaling doesn't work and there are moments when Qt gets really confused and thinks it needs to scale up when it shouldn't. See https://doc.qt.io/qt-5/highdpi.html -- https://www.valdyas.org | https://www.krita.org
