lock.sh

#!/bin/bash

#scrot /tmp/screen.png
gnome-screenshot -f /tmp/screen.png -d 0
convert /tmp/screen.png -scale 5% -scale 2000% /tmp/screen.png

if [[ -f $HOME/.config/screen-lock.png ]]
then
  # placement x/y
  PX=0
  PY=0
  # lockscreen image info
  R=$(file ~/.config/screen-lock.png | grep -o '[0-9]* x [0-9]*')
  RX=$(echo "$R" | cut -d' ' -f 1)
  RY=$(echo "$R" | cut -d' ' -f 3)

  SR=$(xrandr --query | grep ' connected' | cut -f3 -d' ')
  for RES in $SR
  do
    # monitor position/offset
    SRX=$(echo "$RES" | cut -d'x' -f 1)                   # x pos
    SRY=$(echo "$RES" | cut -d'x' -f 2 | cut -d'+' -f 1)  # y pos
    SROX=$(echo "$RES" | cut -d'x' -f 2 | cut -d'+' -f 2) # x offset
    SROY=$(echo "$RES" | cut -d'x' -f 2 | cut -d'+' -f 3) # y offset
    PX=$(("$SROX" + "$SRX"/2 - "$RX"/2))
    PY=$(("$SROY" + "$SRY"/2 - "$RY"/2))

    convert /tmp/screen.png "$HOME"/.config/screen-lock.png \
      -geometry +"$PX"+"$PY" -composite -matte  /tmp/screen.png
  done
fi
# dbus-send --print-reply --dest=org.mpris.MediaPlayer2.spotify \
#   /org/mpris/MediaPlayer2 org.mpris.MediaPlayer2.Player.Stop

i3lock -e -f -i /tmp/screen.png