[Wayland-bugs] [Bug 90735] Touchpad does not feel "right", acceleration issue

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90735

--- Comment #21 from Velimir Lisec <lisec.velimir at gmail.com> ---
Hi Britt and Peter,

I've tried using the touchpad with the patch from comment 15 applied, and it
feels better then the current git master. But to me personally it's too slow. I
guess when the slider work gets finished I could just speed it up from the
settings. The more serious problem is that there's no deceleration, minimum
speed is baseline. That's too fast for slow movements. I've been playing with
the parameters and this is what feels nice to me (also, I added deceleration at
slow speeds):

    double baseline = 0.3;
    double min_speed = 0.2;
    threshold = 1.4;
    max_accel = 0.8;
    incline = 0.06;

    s1 = min(baseline, min_speed + speed_in * incline);
    s2 = baseline + (speed_in - threshold) * incline;

    factor =  min(max_accel, s2 > baseline ? s2 : s1);

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