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I've been trying to figure out the size of a window for use in a small script. My current technique is using wmctrl -lG to find out the dimensions. However, the problem is this:

The x and y figures it gives are for the top left of the window decorations, while the height and width are for just the content area. This means that if the window decorations add 20px of height and 2px of width, wmctrl will report a window as being 640x480, even if it takes up 660x482 on screen. This is a problem because my script's next step would be to use that area to tell ffmpeg to record the screen. I would like to avoid hardcoding in the size of the window decorations from my current setup.

What would suit is either a method to get the size of the window decorations so I can use them to figure out the position of the 640x480 content area, or a way to get the position of the content area directly, not that of the window decorations.

This horribly-rough not-at-all-to-scale diagram should illustrate:

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1  
I mixed up height and width in the figures for the diagram. –  Macha Jun 1 '11 at 16:44
    
Dead image link. –  Ciro Santilli Aug 13 at 6:41
    
close question but also asks other things: superuser.com/questions/164047/… –  Ciro Santilli Aug 13 at 6:47

3 Answers 3

up vote 11 down vote accepted

The following script will give you the top-left screen co-ords and size of the window (without any decoration). . . . xwininfo -id $(xdotool getactivewindow) contains enough information for you.


#!/bin/bash
# Get the coordinates of the active window's
#    top-left corner, and the window's size.
#    This excludes the window decoration.
  unset x y w h
  eval $(xwininfo -id $(xdotool getactivewindow) |
    sed -n -e "s/^ \+Absolute upper-left X: \+\([0-9]\+\).*/x=\1/p" \
           -e "s/^ \+Absolute upper-left Y: \+\([0-9]\+\).*/y=\1/p" \
           -e "s/^ \+Width: \+\([0-9]\+\).*/w=\1/p" \
           -e "s/^ \+Height: \+\([0-9]\+\).*/h=\1/p" )
  echo -n "$x $y $w $h"
#
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The accepted answer explicitly does not include window decoration. For those still looking for how to get the geometry including all decorations, as per this question's title, you can use wmiface as per this other question http://superuser.com/questions/164047/how-to-get-accurate-window-information-dimensions-etc-in-linux-x. Example:

wmiface frameGeometry `wmiface activeWindow`

This returns geometry and position relative to top left like so:

650x437+0+1003

wmiface does not seem to come with all linux distros (I didn't find a package providing it on Mint or Ubuntu) but I was able to install it from the packages here: http://kde-apps.org/content/show.php?content=40425

And it comes with no docs nor even --help, but the README is here:

https://gitorious.org/wmiface/wmiface/source/ea941eeb2076124734f6a3d3079326c826b462d7:README

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The accepted answer can be extended to get the entire window:

entire=false
x=0
y=0
w=0
h=0
b=0  # b for border
t=0  # t for title (or top)

# ... find out what user wants then 

eval $(xwininfo -id $(xdotool getactivewindow) |
  sed -n -e "s/^ \+Absolute upper-left X: \+\([0-9]\+\).*/x=\1/p" \
         -e "s/^ \+Absolute upper-left Y: \+\([0-9]\+\).*/y=\1/p" \
         -e "s/^ \+Width: \+\([0-9]\+\).*/w=\1/p" \
         -e "s/^ \+Height: \+\([0-9]\+\).*/h=\1/p" \
         -e "s/^ \+Relative upper-left X: \+\([0-9]\+\).*/b=\1/p" \
         -e "s/^ \+Relative upper-left Y: \+\([0-9]\+\).*/t=\1/p" )
if [ "$entire" = true ]
then                     # if user wanted entire window, adjust x,y,w and h
    let x=$x-$b
    let y=$y-$t
    let w=$w+2*$b
    let h=$h+$t+$b
fi
echo "$w"x"$h" $x,$y
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