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Qt itself actually already supports it, is the thing. If you set screen dpi in the xresources Xft.dpi, many gui toolkits including Qt and GTK will properly scale themselves in all aspects not just fonts (r-slurred ultrahack but that's X). They will also apparently do it if certain environment variables are set. Wayland isn't able to take advantage of this so they get fractionally scaled the same way dumb non-aware apps would be scaled: rendered 2x (wayland does support integer scales at least) and then linearly downscaled to the desired size. XWayland can't even get that right, in xwayland the apps are rendered at 1x and then upscaled which is god-awful.

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oh wow, that's great news. hopefully it goes through and we can have good scaling in like 3 years.

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if you can wrangle build scripts it looks like you can try it in Sway?

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Essentially what needs to happen is that there needs to be an opt-in protocol where an app can say "hey, I know what I'm doing, don't try to scale me I can do it properly myself" which qt/gtk could then implement.

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