Script to make blurry lock screen. I previously did this using imagemagick, which was horrifyingly slow, especially on very high resolutions. The ffmpeg approach is way faster 😄

lock

#!/bin/bash

# temporary path for screenshot
TMPBG=/tmp/screen.png

# replace this with your own "lock" icon
LOCK=$HOME/Dropbox/Bilder/Wallpaper/lock.png

# get resolution
RES=$(xrandr | grep 'current' | sed -E 's/.*current\s([0-9]+)\sx\s([0-9]+).*/\1x\2/')

# grab current screen from X framebuffer, blur it and add overlay
ffmpeg -f x11grab -video_size $RES -y -i $DISPLAY -i $LOCK -filter_complex "boxblur=10:1,overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2" -vframes 1 $TMPBG -loglevel quiet

# lock i3 with generated image
i3lock -i $TMPBG

# i3lock caches image, can be removed safely
rm $TMPBG