LinuxTouchTransform: wrong range on flipXY and continuus re-calculation
info at cuhka.com
Wed Mar 2 08:38:20 UTC 2016
It seems to me that initTransform(int axis, int index) in
LinuxTouchTransform calculates the wrong range. Regardless of the flipXY
setting it uses for the ABS_X the device's width and for the ABS_Y the
device's height. While in case with flipXY it should use for ABS_X the
device's height and for ABS_Y as the device's width.
Without this correction it becomes impossible to 'calibrate' a touch
screen, especially if the minX and minY aren't zero.
As an aside, I noticed that the LinuxTouchTransform's initTransform is
called every time a touch event is delivered to the system. This seems
unnecessary, as long as the screen is the same screen all transforms and
scalars will remain the same for each touch event.
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