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#!/usr/bin/env bash
# Copyright 2019 Luke Shumaker
# env-var: MAX_DPI: integer
# env-var: DRY_RUN: empty/non-empty
( # Phase 1: Probe outputs
export LC_ALL=C
xrandr | sed -rn -e 's@(.*) connected( .*)? ([0-9]+)x([0-9]+)\+([0-9]+)\+([0-9]+)( .*)? ([0-9]+)mm x ([0-9]+)mm( .*)?@\1 \3 \4 \8 \9@p' -e 's@^ ([0-9]+)x([0-9]+)i? .*\*.*@ \1 \2@p' | sed '/^\S/{ N; s/\n//; }'
# 1 2 3 4 5 6 7 8 9 10 1 2
# `-outputName | `-fb_xpx `-fb_ypx `-fb_xoff `-fb_yoff `- hw_xmm `- hw_ymm | `-hw_xpx `-hw_ypx
# `-discard `- discard `- discard
) | ( # Phase 2: Translate that to a set of actions to perform
max_xdpi=${MAX_DPI:-96}
max_ydpi=${MAX_DPI:-96}
dpi=$(xrdb -query|sed -n 's/^Xft\.dpi:\s*//p')
xdpi=${dpi%%x*}
ydpi=${dpi#*x}
if (( xdpi > max_xdpi )); then
max_xdpi=$xdpi
fi
if (( ydpi > max_ydpi )); then
max_ydpi=$ydpi
fi
declare -A outputs
while read -r output fb_xpx fb_ypx hw_xmm hw_ymm hw_xpx hw_ypx; do
hw_xdpi=$(bc <<<"($hw_xpx*25.4)/$hw_xmm")
hw_ydpi=$(bc <<<"($hw_ypx*25.4)/$hw_ymm")
fb_xdpi=$(bc <<<"($fb_xpx*25.4)/$hw_xmm")
fb_ydpi=$(bc <<<"($fb_ypx*25.4)/$hw_ymm")
if (( hw_xdpi > max_xdpi )); then
max_xdpi=$hw_xdpi
fi
if (( hw_ydpi > max_ydpi )); then
max_ydpi=$hw_ydpi
fi
if (( fb_xdpi > max_xdpi )); then
max_xdpi=$fb_xdpi
fi
if (( fb_ydpi > max_ydpi )); then
max_ydpi=$fb_ydpi
fi
outputs["$output"]="$hw_xdpi $hw_ydpi"
done
echo 'xrandr \'
printf ' --dpi %q \\\n' "${max_xdpi}x${max_ydpi}"
for output in "${!outputs[@]}"; do
read -r xdpi ydpi <<<"${outputs[$output]}"
printf ' --output %q --scale %q \\\n' "$output" "$(bc <<<"scale=5; $max_xdpi/$xdpi")x$(bc <<<"scale=5; $max_ydpi/$ydpi")"
done
echo
printf "xrdb -merge <<<'Xft.dpi: %s'\n" "${max_xdpi}x${max_ydpi}"
) | ( # Phase 3: Apply those actions
if [[ -z "$DRY_RUN" ]]; then
bash -v
else
cat
fi
)
|
