picom/bin/compton-trans

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#!/bin/bash
# transset in a bash script
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# Copyright (c) 2011-2012, Christopher Jeffrey
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# Usage:
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# by window id
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# settrans -w "$WINDOWID" -o 75
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# by name
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# settrans -n "urxvt" -o 75
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# by current window
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# settrans -c -o 75
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# by selection
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# settrans -s -o 75
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# increment current window 5%
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# settrans -c -o +5
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# "command" is a shell built-in, faster than "which"
if test -z "$(command -v xprop)" -o -z "$(command -v xwininfo)"; then
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echo "Please install x11-utils/xorg-xprop/xorg-xwininfo." >& 2
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exit 1
fi
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window=
opacity=
cur=
active=
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i=
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while getopts "scn:w:o:" option; do
case "$option" in
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s) window="" ;;
c)
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active=$(xprop -root -notype "_NET_ACTIVE_WINDOW" \
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| sed 's/^.*\(0x\S*\).*$/\1/')
wprefix='-id '; window="$active"
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;;
n) wprefix='-name '; window="$OPTARG" ;;
w) wprefix='-id '; window="$OPTARG" ;;
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o) opacity="$OPTARG" ;;
esac
done
# Validate opacity value
if [ -z "$opacity" ]; then
echo "No opacity specified."
exit 1
fi
opacity="$(echo "$opacity" \
| sed -rn 's/^[[:space:]]*([+-]?[[:digit:]]+)[[:space:]]*$/\1/p')"
if [ -z "$opacity" ]; then
echo "Invalid opacity value."
exit 1
fi
# Get ID of the target window
if [ -z "$wprefix" ]; then
wid=$(xwininfo | sed -n 's/^xwininfo:.*: \(0x[[:xdigit:]]*\).*$/\1/p')
else
wid=$(xwininfo $wprefix"$window" | sed -n 's/^xwininfo:.*: \(0x[[:xdigit:]]*\).*$/\1/p')
fi
if [ -z "$wid" ]; then
echo "Failed to find window."
exit 1
fi
treeout="$(xwininfo -id "$wid" -children)"
# Make sure it's not root window
if echo "$treeout" | fgrep "Parent window id: 0x0" > /dev/null; then
echo "Cannot set opacity on root window."
exit 1
fi
# Get the whole window tree
treeout="$(xwininfo -root -tree)"
if [ -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)"
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if [ -z "$lineno" ]; then
echo "Failed to find window in window tree."
exit 1
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fi
# Find the highest ancestor of the target window below
topmost=$(echo -n "$treeout" | head -n $(($lineno + 1)) | sed -n 's/^ \(0x[[:xdigit:]]*\).*/\1/p' | tail -n1)
if [ -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
sign=$(echo "$opacity" | cut -b1)
cur=$(xprop -id "$topmost" -notype "_NET_WM_WINDOW_OPACITY" \
| sed 's/^.*\b\([0-9]\+\).*$\|^.*$/\1/')
[ -z "$cur" ] && cur=0xffffffff
cur=$((cur * 100 / 0xffffffff))
opacity="$(echo "$opacity" | sed 's/^[+-]//')"
opacity=$(($cur $sign $opacity))
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fi
[ $opacity -lt 0 ] && opacity=0
[ $opacity -gt 100 ] && opacity=100
# Set opacity
opacity=$(($opacity * 0xffffffff / 100))
xprop -id "$topmost" -f _NET_WM_WINDOW_OPACITY 32c \
-set _NET_WM_WINDOW_OPACITY "$opacity"