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#!/usr/bin/env bash
# Copyright 2019 Luke Shumaker
sanitize() {
[[ $? == 0 ]] || return $?
printf '%g\n' "$@"
}
calc() {
[[ $? == 0 ]] || return $?
sanitize "$(bc <<<"scale=6; $1")"
}
round() {
[[ $? == 0 ]] || return $?
printf '%.f\n' "$@"
}
roundup_by() {
[[ $? == 0 ]] || return $?
awk -v by="$2" 'function ceil(x) { return (x == int(x)) ? x : int(x)+1 } { print ceil($1/96)*96 }' <<<"$1"
}
max() {
[[ $? == 0 ]] || return $?
awk -v a="$1" -v b="$2" '{ print (a > b) ? a : b }' <<<''
}
errusage() {
if (( $# > 0 )); then
printf '%s: %s\n' "${0##*/}" "$(printf "$@")" >&2
fi
printf "Try '%s --help' for more information.\n" "${0##*/}" >&2
exit 2
}
usage() {
printf 'Usage: %s [OPTIONS]\n' "${0##*/}"
printf "Adjust DPI settings to reflect each output's current mode\n"
printf "(pixel resolution) and self-reported physical dimensions (mm).\n"
echo
printf 'OPTIONS:\n'
printf ' -h, --help Show this message\n'
printf ' -n, --dry-run Print what would be done, without doing it\n'
printf ' --render-dpi=<auto|auto-hwonly|DPI|XDPIxYDPI>\n'
printf ' Specify what DPI applications should render\n'
printf ' at (default: auto)\n'
printf ' --device-geometry=OUTPUT=<X>x<Y>[x<Z>]\n'
printf ' Override the hardware-reported physical\n'
printf ' dimensions for the X11 output OUTPUT; see\n'
printf ' `get-dpi --help`\n'
}
set -euE -o pipefail
args=$(getopt -n "${0##*/}" -o 'hn' -l 'help,dry-run,render-dpi:,device-geometry:' -- "$@") || errusage
eval "set -- $args"
arg_dry_run=false
arg_render_dpi=auto
get_dpi_args=()
while (( $# > 0 )); do
case "$1" in
-h|--help)
usage
exit 0
;;
-n|--dry-run)
arg_dry_run=true
shift
;;
--render-dpi)
arg_render_dpi=$2
case "$2" in
auto|auto-hwonly)
arg_render_dpi=$2
;;
*)
if ! arg_render_dpi="$(sanitize "${2%%x*}" 2>/dev/null)x$(sanitize "${2#*x}" 2>/dev/null)"; then
errusage 'Invalid --render-dpi=%q' "$2"
fi
;;
esac
shift 2
;;
--device-geometry)
get_dpi_args+=("$1=$2")
shift 2
;;
--)
shift
break
;;
esac
done
if (( $# > 0 )); then
errusage
fi
dpis="$(get-dpi "${get_dpi_args[@]}")"
if [[ $arg_render_dpi == auto ]] || [[ $arg_render_dpi == auto-hwonly ]]; then
arg_render_xdpi=96
arg_render_ydpi=96
while read -r source item dpi; do
if [[ $arg_render_dpi == auto-hwonly ]] && [[ $source != X11-RandR-hw ]]; then
continue
fi
arg_render_xdpi=$(max "$(round "${dpi%%x*}")" "$arg_render_xdpi")
arg_render_ydpi=$(max "$(round "${dpi#*x}")" "$arg_render_ydpi")
done <<<"$dpis"
# GDK 3 only supports integer up-scale factors, because
# they're morons. Round arg_render_dpi up to a multiple of '96'.
arg_render_xdpi=$(roundup_by "$arg_render_xdpi" 96)
arg_render_ydpi=$(roundup_by "$arg_render_ydpi" 96)
else
arg_render_xdpi=${arg_render_dpi%%x*}
arg_render_ydpi=${arg_render_dpi#*x}
fi
(
echo 'xrandr \'
printf ' --dpi %q \\\n' "${arg_render_xdpi}x${arg_render_ydpi}"
while read -r source item dpi; do
if [[ $source != X11-RandR-hw ]]; then
continue
fi
hw_xdpi="$(sanitize "${dpi%%x*}")"
hw_ydpi="$(sanitize "${dpi#*x}")"
fb_xdpi="$(calc "$arg_render_xdpi/$hw_xdpi")"
fb_ydpi="$(calc "$arg_render_ydpi/$hw_ydpi")"
printf ' --output %q --scale %q \\\n' "$item" "${fb_xdpi}x${fb_ydpi}"
done <<<"$dpis"
echo
printf "xrdb -merge <<<'Xft.dpi: %s'\n" "${arg_render_xdpi}x${arg_render_ydpi}"
echo
GDK_SCALE="$(calc "(${arg_render_xdpi}+${arg_render_ydpi})/2 /96")"
printf 'export GDK_SCALE=%q\n' "$GDK_SCALE"
# You're not "supposed" to set XRDB Xft.dpi if GDK_SCALE is
# set. Undo Xft.dpi for GDK applications.
GDK_DPI_SCALE="$(calc "1/$GDK_SCALE")"
printf 'export GDK_DPI_SCALE=%q\n' "$GDK_DPI_SCALE"
echo systemctl --user import-environment GDK_SCALE GDK_DPI_SCALE
) | (
if $arg_dry_run; then
cat
else
bash -v
fi
)
|
