On Mon, Aug 26, 2013 at 07:59:46PM +0800, Shih-Yuan Lee (FourDollars) wrote: > > So your software keeps the touchscreen calibration working if the > > display configuration is modified by xrandr etc., but depends on > > an already calibrated default configuration? > Yes, my program keeps touchscreen calibration working no matter what the > display configuration is changed, but doesn't depend on an already > calibrated default configuration. How is that supposed to work? AFAIK on some devices the touchscreen is not attached in the same orientation as the internal screen (IIRC I already saw an inverted one). So let's assume a testcase: * screen is _not_ inverted/rotated/scaled/... (= default) * touchscreen is using default values and thus is inverted Thus the touchscreen input is broken out of the box. How can you calibrate this without getting any user input? How do you know, that the initial touchscreen input is inverted/rotated/scaled/...? > It will calculate the Coordinate Transformation Matrix of > Touchscreen everytime when xrandr changes the output > configuration. Yeah, but that does not help for the initial calibration of the touchscreen. It obviously is a nice way to keep the touchscreen working when xrandr is used. -- Sebastian
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