i3-render-titlebars.sh

#!/usr/bin/env bash

set -e


# Check requirements
die() {
	echo "$*" >&2
	exit 1
}
for cmd in i3 xterm feh compton import convert mogrify montage Xephyr; do
	command -v $cmd > /dev/null || die "Error: command '$cmd' not found"
done


run() {
	local no=$1 win_bg=$2 win_fg=$3 rgba=$4

	cat > tmp/i3.conf <<- EOF
		font pango:Sans 12
		client.focused #4c7899 #$win_bg #$win_fg #2e9ef4 #285577
		bindsym 1 workspace number 1
		exec --no-startup-id xterm -e 'sleep 0.01; import -w root \$OUT_PNG; i3-msg exit'
		for_window [class=".*"] title_format abc🇺🇳😸 l|1│█
	EOF

	cat > tmp/fontconfig/fonts.conf <<- EOF
		<?xml version="1.0"?>
		<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
		<fontconfig>
			<cachedir>~/.cache/fontconfig</cachedir>
			<match target="pattern">
				<edit name="antialias" mode="assign"><bool>true</bool></edit>
				<edit name="autohint" mode="assign"><bool>false</bool></edit>
				<edit name="hintstyle" mode="assign"><const>hintslight</const></edit>
				<edit name="hinting" mode="assign"><bool>true</bool></edit>
				<edit name="rgba" mode="assign"><const>$rgba</const></edit>
				<edit name="lcdfilter" mode="assign"><const>lcddefault</const></edit>
			</match>
		</fontconfig>
	EOF

	OUT_PNG=tmp/s/$no.png i3 -c tmp/i3.conf
}

rm -rf tmp
mkdir -p tmp/fontconfig tmp/s

unset I3SOCK
Xephyr :100 &
xephyr_pid=$!
sleep 0.1

export DISPLAY=:100
export XDG_CONFIG_HOME=$PWD/tmp

compton &
compton_pid=$!
sleep 0.1

convert -size 50x50 pattern:gray50 -fill '#00ff00' -opaque black -fill '#0000ff' -opaque white tmp/bg.png
feh --no-fehbg --bg-tile ./tmp/bg.png

run 00 285577 ffffff none
run 01 285577 ffffff rgb

run 10 285577 ff0000 none
run 11 285577 ff0000 rgb

run 20 ffffff 000000 none
run 21 ffffff 000000 rgb

run 30 000000 ffffff none
run 31 000000 ffffff rgb

run 40 00000000 000000 none
run 41 00000000 000000 rgb

run 50 00000000 0000007f none
run 51 00000000 0000007f rgb

run 60 00000000 ff00007f none
run 61 00000000 ff00007f rgb

run 70 000000 ff00007f none
run 71 000000 ff00007f rgb

run 80 000000 00000000 none
run 81 000000 00000000 rgb

run 90 000000 ff000000 none
run 91 000000 ff000000 rgb

kill $compton_pid $xephyr_pid

mogrify \
	-interpolate Nearest -filter point -crop 90x20+0+0 -resize 300% \
	tmp/s/*.png

montage -geometry '1x1+2+2<' -tile 2x tmp/s/*.png result.png