Replace pointer acceleration with a much simpler linear one
We ran a userstudy, evaluating three different accel methods. Detailed results are available at: http://www.who-t.net/publications/hutterer2014_libinput_ptraccel_study.pdf We found that there was little difference between the method we had in libinput 0.6 and this three-line function. Users didn't really notice a difference, but measured data suggests that it has slight advantages in some use-cases. The method proposed here is the one labeled "linear" in the paper, its profile looks roughly like this: _____________ / ____/ / / where the x axis is the speed, y is the acceleration factor. The first plateau is at the acceleration factor 1 (i.e. unaccelerated movement), the second plateau is at the max acceleration factor. The threshold in the code defines where and how long the plateau is. Differences to the previous accel function: - both inclines are linear rather than curved - the second incline is less steep than the current method From a maintainer's point-of-view, this function is significantly easier to understand and manipulate than the previous one. Signed-off-by:Peter Hutterer <peter.hutterer@who-t.net> Reviewed-by:
Hans de Goede <hdegoede@redhat.com>
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