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There are many toolkit specific ways to set a font DPI in X11 desktop environments. The primary approach of reading a Gnome specific setting from the portal is ok, it will work on Gnome and on Plasma most the time. The current fallback GDK_SCALE is less great; it's an internal GTK setting relating to the mapping of logical pixels to device pixels within the toolkit, it's a developer setting for GTK devs. We were instructed within Plasma to not set this as it caused issues. Xft.dpi in xresources is a good universal fallback, it's very dated to the point that it works in clients like xterm, Qt on X11 uses it in our font DPI path.
Simple DirectMedia Layer (SDL) Version 3.0
Simple DirectMedia Layer is a cross-platform development library designed to provide low level access to audio, keyboard, mouse, joystick, and graphics hardware via OpenGL and Direct3D. It is used by video playback software, emulators, and popular games including Valve's award winning catalog and many Humble Bundle games.
More extensive documentation is available in the docs directory, starting with README.md
Enjoy!
Sam Lantinga (slouken@libsdl.org)