Added bindsym and picom setting for colour inverting selected windows.

i3/config

@@ -221,7 +221,11 @@ bindsym $mod+$mod_next+c exec --no-startup-id $picom_start
 
 # window dimming enable or disable (uses xdotool and xprop to set a anti-dim flag, which picom recognises in focus-exclude array)
 bindsym $mod+$mod_next+a exec xprop -id $(xdotool getactivewindow) -f ANTIDIM_FLAG 8c -set ANTIDIM_FLAG 1; exec notify-send 'anti-dim set on window'
-bindsym $mod+$mod_next+d exec xprop -id $(xdotool getactivewindow) -remove ANTIDIM_FLAG; exec notify-send 'dim set on window'
+bindsym $mod+$mod_next+Shift+a exec xprop -id $(xdotool getactivewindow) -remove ANTIDIM_FLAG; exec notify-send 'dim set on window'
+
+# window colour inversion (uses xdotool and xprop to set an invert flag, which picom recognises in invert-color-include array)
+bindsym $mod+$mod_next+d exec xprop -id $(xdotool getactivewindow) -f INVERT_FLAG 8c -set INVERT_FLAG 1; exec notify-send 'invert set on window'
+bindsym $mod+$mod_next+Shift+d exec xprop -id $(xdotool getactivewindow) -remove INVERT_FLAG; exec notify-send 'invert removed on window'
 
 # focus the parent container
 bindsym $mod+a focus parent

picom/picom.conf

@@ -207,6 +207,11 @@ focus-exclude = [
   "_NET_WM_STATE@:32a *= '_NET_WM_STATE_STICKY'"
 ];
 
+# Specify list of windows or x flag to that will be colour inverted.
+invert-color-include = [
+    "INVERT_FLAG@:8c"
+];
+
 # Use WM_TRANSIENT_FOR to group windows, and consider windows in the same group focused at the same time.
 detect-transient = true;
 # Use WM_CLIENT_LEADER to group windows, and consider windows in the same group focused at the same time.