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this post was submitted on 31 Jan 2024
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@Bro666 With the transition from QT5 to 6 and Plasma 5.27's implementation of wp-fractional-scale-v1, will most KDE apps now be able to fractionally scale without using the upscale-downscale method? (Or in other words, how QT apps fractionally scale under X11)
That's correct!
@davidre While KDE doesn't oversee LibreOffice development, since they also have a QT6 backend for their UI, might they also benefit from this? Currently fractional scaled LibreOffice under Wayland with the QT5 backend is extremely laggy, presumably due to the upscale-downscale method.
LibreOffice uses its own toolkit called VCL which uses a number back-ends to render using native toolkits on all platforms, similar in concept to WxWidgets. I don't know if the way VCL works allows Qt6 fractional scaling to just work, but a Qt6/KF6 back-end already exists and can be forced by setting
SAL_USE_VCLPLUGIN=qt6orSAL_USE_VCLPLUGIN=kf6, so you should be able to try it out right now.