xwd -root | convert xwd:- -filter Gaussian -thumbnail 20% -sample 500% \
       \( -background none -density 250x250 /usr/share/icons/ContrastHigh/scalable/actions/system-lock-screen.svg -gravity center -geometry -960  \) -compose over -composite   /tmp/i3lock.png

/usr/bin/i3lock -f -i /tmp/i3lock.png

# sleep 1
xset dpms force off