depot/third_party/nixpkgs/pkgs/by-name/sc/scarab/scaling-settings.bash

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Bash

# Keep existing value if it is already non-empty
if [[ -z "${AVALONIA_GLOBAL_SCALE_FACTOR-}" ]] && command -v gsettings >/dev/null; then
echo 'Attempting to get GNOME desktop interface scaling factor' >&2
AVALONIA_GLOBAL_SCALE_FACTOR="$(gsettings get org.gnome.desktop.interface scaling-factor)"
AVALONIA_GLOBAL_SCALE_FACTOR="${AVALONIA_GLOBAL_SCALE_FACTOR##* }"
fi
if [[ "${AVALONIA_GLOBAL_SCALE_FACTOR-}" == "0" ]]; then
echo 'Unset invalid scaling value' >&2
unset AVALONIA_GLOBAL_SCALE_FACTOR
fi
if [[ -z "${AVALONIA_GLOBAL_SCALE_FACTOR-}" ]] && command -v xrdb >/dev/null; then
echo 'Attempting to get scaling factor from X FreeType DPI setting' >&2
dpi="$(xrdb -get Xft.dpi)"
if [[ -n "${dpi}" ]]; then
AVALONIA_GLOBAL_SCALE_FACTOR=$(echo "scale=2; ${dpi}/96" | bc)
fi
fi
if [[ -n "${AVALONIA_GLOBAL_SCALE_FACTOR-}" ]]; then
echo "Applying scale factor: ${AVALONIA_GLOBAL_SCALE_FACTOR}" >&2
export AVALONIA_GLOBAL_SCALE_FACTOR
fi