• Peter Hutterer's avatar
    Implement stylus pressure curve support · 5d047073
    Peter Hutterer authored
    Takes a 4-point cubic bezier curve as input and maps the pressure coordinates
    to the values outlined by this curve. This is an extension of the current
    implementation in the xf86-input-wacom driver which only allows the two center
    control points to be modified.
    
    Over the years a few users have noted that the wacom driver's pressure curve
    makes it impossible to cap the pressure at a given value. Given our bezier
    implementation here, it's effectively a freebie to add configurability of the
    first and last control points. We do require all control points' x coordinates
    to be in ascending order.
    Signed-off-by: Peter Hutterer's avatarPeter Hutterer <peter.hutterer@who-t.net>
    5d047073
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