#!/bin/sh
#
# I find this handy for demos where I can magnify as much of the origonal
# screen as possible to the full screen size and specified magnification.

# License: LGPLv2

# Note this only allows for the xmag menu on the fullscreen display.
# So you should make xmag fullscreen, ie remove titlebar etc (shift+F11 in gnome).

test ! -z $1 && setglobal mag = $1 || setglobal mag = '2'

proc fullscreen_xmag_source {
    #could also do: geometry=`xdpyinfo | grep dimensions | tr -s ' ' | cut -d' ' -f3`
    setglobal geometry = $[xwininfo -root | grep -E "geometry" | sed 's/.* \([0-9]*x[0-9]*\).*/\1/]
    setglobal width = $[echo $geometry | cut -dx -f1]
    setglobal height = $[echo $geometry | cut -dx -f2]
    setglobal xmag_menu = '20'
    echo $[expr $width / $mag]x$[expr '(' $height - $xmag_menu ')' / $mag]
}

xmag -source $[fullscreen_xmag_source] -mag $mag