picom/bin/compton-trans

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#!/bin/sh
#
# compton-trans
# transset in a bash script
# Copyright (c) 2011-2012, Christopher Jeffrey
#
# Usage:
# By window id
# $ compton-trans -w "$WINDOWID" 75
# By name
# $ compton-trans -n "urxvt" 75
# By current window
# $ compton-trans -c 75
# By selection
# $ compton-trans 75
# $ compton-trans -s 75
# Increment current window 5%
# $ compton-trans -c +5
# "command" is a shell built-in, faster than "which"
if test -z "$(command -v xprop)" -o -z "$(command -v xwininfo)"; then
echo "Please install x11-utils/xorg-xprop/xorg-xwininfo." >& 2
exit 1
fi
window=
opacity=
cur=
i=
# Read options
while getopts "scn:w:o:" option; do
case "$option" in
s) wprefix=''; window='' ;;
c)
active=$(xprop -root -notype "_NET_ACTIVE_WINDOW" \
| sed 's/^.*\(0x\S*\).*$/\1/')
wprefix='-id'; window=$active
;;
n) wprefix='-name'; window=$OPTARG ;;
w) wprefix='-id'; window=$OPTARG ;;
o) opacity=$OPTARG ;;
\?) exit 1;;
esac
done
# Read positional arguments
shift $(($OPTIND - 1))
test -n "$1" && opacity=$1
# Validate opacity value
if test -z "$opacity"; then
echo "No opacity specified."
exit 1
fi
opacity=$(echo "$opacity" \
| sed 's/%//g' \
| sed -rn 's/^[[:space:]]*([+-]?[[:digit:]]+)[[:space:]]*$/\1/p')
if test -z "$opacity"; then
echo "Invalid opacity value."
exit 1
fi
# Get ID of the target window
if test -z "$wprefix"; then
treeout=$(xwininfo -children -frame)
else
treeout=$(xwininfo -children $wprefix "$window")
fi
wid=$(echo "$treeout" | sed -n 's/^xwininfo:.*: \(0x[[:xdigit:]]*\).*$/\1/p')
if test -z "$wid"; then
echo "Failed to find window."
exit 1
fi
# Make sure it's not root window
if echo "$treeout" | fgrep "Parent window id: 0x0" > /dev/null; then
echo "Cannot set opacity on root window."
exit 1
fi
# If it's already the topmost window
if echo "$treeout" | grep "Parent window id: 0x[[:xdigit:]]* (the root window)" > /dev/null; then
topmost=$wid
else
# Get the whole window tree
treeout=$(xwininfo -root -tree)
if test -z "$treeout"; then
echo "Failed to get root window tree."
exit 1
fi
# Find the line number of the target window in the window tree
lineno=$(echo -n "$treeout" | grep -nw "$wid" | head -n1 | cut -d ':' -f 1)
if test -z "$lineno"; then
echo "Failed to find window in window tree."
exit 1
fi
# Find the highest ancestor of the target window below
topmost=$(echo -n "$treeout" \
| head -n $(($lineno + 1)) \
| sed -n 's/^ \(0x[[:xdigit:]]*\).*/\1/p' | tail -n1)
fi
if test -z "$topmost"; then
echo "Failed to find the highest parent window below root of the" \
"selected window."
exit 1
fi
# Calculate the desired opacity
if echo "$opacity" | grep '^[+-]' > /dev/null; then
cur=$(xprop -id "$topmost" -notype "_NET_WM_WINDOW_OPACITY" \
| sed 's/^.*\b\([0-9]\+\).*$\|^.*$/\1/')
test -z "$cur" && cur=0xffffffff
cur=$((cur * 100 / 0xffffffff))
opacity=$(($cur + $opacity))
fi
test $opacity -lt 0 && opacity=0
test $opacity -gt 100 && opacity=100
# Set opacity
opacity=$((opacity * 0xffffffff / 100))
xprop -id "$topmost" -f _NET_WM_WINDOW_OPACITY 32c \
-set _NET_WM_WINDOW_OPACITY "$opacity"