Use 'xrandr' to determine DPI on Linux, especially with wayland #17
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…for auto-detection" It doesn't work consistently with different versions of SDL2+wayland. It is either twice as big or twice as small than it should be. This reverts commit 7dcbb6d.
SDL2+wayland in various versions reports different DPI depending on scaling. On some versions it reports the monitor's true DPI regardless of desktop scale factor. In other versions it scales the monitor's DPI down based on desktop scale factor. However there isn't a way to detect which one it is, so the only reliable way to get DPI on wayland ... is to rely on XWayland and xrandr which reports all this correctly. (or use wayland-info but that isn't always installed). 'xdpyinfo' would report a bogus 96 DPI always, so that cannot be used. Signed-off-by: Edwin Török <edwin@etorok.net>
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I still need to test this in various configurations, but it should implement the basic idea discussed in the other PR. |
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See discussion in #16, SDL2's wayland support is not great and different versions report DPI differently based on desktop scaling.
Latest SDL2 version (at least on Fedora 37) seems to have wayland reenabled by default, but still quite problematic.
Fall back to using 'xrandr' for now, which seems to report correct DPI.