[kubuntu] Xrandr find out current scale factor used

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http://ubuntuforums.org – I want to create a 'desktop zoom' for use with xfce using xrandr Normally I work with a scaled desktop: at start of session I do on my 1920x1080 laptop screen: xrandr --output LVDS1 --scale 1.3x1.3 --panning 2496x1404 giving me a slightly larger desktop. Now in my 'zoomin' button which is supposed to zoom in one step, I do something like xrandr --output LVDS1 --scale 1.17x1.17 --panning 2496x1404 so I can move around the same desktop showing an enlarged area . I want to implement a button that zooms in steps. But then I need to know the current scale factor or size of the v (Hardware)