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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")"
}
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 "Report DPI settings\n"
echo
printf 'OPTIONS:\n':
printf ' -h, --help Show this message\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; X, Y,\n'
printf ' and Z must either have a suffix of "in" or\n'
printf ' "mm", or be "auto"; providing Z causes the\n'
printf ' the dimensions to be scaled to a reference\n'
printf ' viewing distance of 28in (as described in\n'
printf ' [CSS3-values])\n'
echo
printf '[CSS3-values]: https://www.w3.org/TR/css3-values/#reference-pixel\n'
}
set -euE -o pipefail
args=$(getopt -n "${0##*/}" -o 'hn' -l 'help,device-geometry:' -- "$@") || errusage
eval "set -- $args"
declare -A arg_device_geometry
while (( $# > 0 )); do
case "$1" in
-h|--help)
usage
exit 0
;;
--device-geometry)
if [[ "$2" != *=* ]]; then
errusage 'Invalid --device-geometry=%q' "$2"
fi
device=${2%=*}
geometry=${2##*=}
re_dim='([0-9]+(.[0-9]+)?(in|mm)|auto)'
re_geo="^${re_dim}x${re_dim}(x${re_dim})?\$"
if ! [[ "$geometry" =~ $re_geo ]]; then
errusage 'Invalid --device-geometry=%q' "$2"
fi
arg_device_geometry["$device"]=$geometry
shift 2
;;
--)
shift
break
;;
esac
done
if (( $# > 0 )); then
errusage
fi
# Xft
dpi=$(xrdb -query|sed -n 's/^Xft\.dpi:\s*//p')
[[ -n "$dpi" ]] || dpi=96x96
xft_xdpi=$(sanitize "${dpi%%x*}")
xft_ydpi=$(sanitize "${dpi#*x}")
echo X11-resources Xft ${xft_xdpi}x${xft_ydpi}
# GDK
gdk_scale=$(sanitize "${GDK_SCALE:-1}")
dpi=$(calc "${gdk_scale} * 96")
echo environment GDK-widget ${dpi}x${dpi}
gdk_dpi_scale=$(sanitize "${GDK_DPI_SCALE:-1}")
dpi=$(calc "${gdk_scale} * ${gdk_dpi_scale} * ${xft_xdpi}")
echo environment+X11-resources GDK-text ${dpi}x${dpi}
# RandR
(
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
) | while read -r output fb_xpx fb_ypx hw_xmm hw_ymm hw_xpx hw_ypx; do
if [[ -n "${arg_device_geometry["$output"]:-}" ]]; then
IFS=x read override_x override_y override_z <<<"${arg_device_geometry["$output"]}"
case "$override_x" in
*mm) override_xmm="$(sanitize "${override_x%mm}")";;
*in) override_xmm="$(calc "$(sanitize "${override_x%in}")*25.4")";;
auto) override_xmm="$hw_xmm";;
esac
case "$override_y" in
*mm) override_ymm="$(sanitize "${override_y%mm}")";;
*in) override_ymm="$(calc "$(sanitize "${override_y%in}")*25.4")";;
auto) override_ymm="$hw_ymm";;
esac
if [[ "$override_z" == '' || "$override_z" == 'auto' ]]; then
hw_xmm=$override_xmm
hw_ymm=$override_ymm
else
# algorithm from https://www.w3.org/TR/css3-values/#reference-pixel
ref_zmm=711.2 # 28in
case "$override_z" in
*mm) override_zmm="$(sanitize "${override_z%mm}")";;
*in) override_zmm="$(calc "$(sanitize "${override_z%in}")*25.4")";;
esac
hw_xmm=$(calc "(${override_xmm}*${ref_zmm})/${override_zmm}")
hw_ymm=$(calc "(${override_ymm}*${ref_zmm})/${override_zmm}")
fi
fi
hw_xdpi=$(calc "($hw_xpx*25.4)/$hw_xmm")
hw_ydpi=$(calc "($hw_ypx*25.4)/$hw_ymm")
fb_xdpi=$(calc "($fb_xpx*25.4)/$hw_xmm")
fb_ydpi=$(calc "($fb_ypx*25.4)/$hw_ymm")
echo X11-RandR-hw $output ${hw_xdpi}x${hw_ydpi}
echo X11-RandR-fb $output ${fb_xdpi}x${fb_ydpi}
done
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