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#!/usr/bin/env bash
# Copyright 2019 Luke Shumaker
sanitize() {
printf '%g\n' "$@"
}
calc() {
sanitize "$(bc <<<"scale=6; $1")"
}
# GDK
dpi=$(calc "$(sanitize "${GDK_SCALE:-1}") * 96")
echo environment GDK-widget ${dpi}x${dpi}
dpi=$(calc "$(sanitize "${GDK_DPI_SCALE:-1}") * 96")
echo environment GDK-text ${dpi}x${dpi}
# Xft
dpi=$(xrdb -query|sed -n 's/^Xft\.dpi:\s*//p')
[[ -n "$dpi" ]] || dpi=96x96
xdpi=$(sanitize "${dpi%%x*}")
ydpi=$(sanitize "${dpi#*x}")
echo X11-resources Xft ${xdpi}x${ydpi}
# 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
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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