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>

1 files changed, 4 insertions, 9 deletions

diff --git a/src/filter.h b/src/filter.h
index 85534952..be48838c 100644
--- a/src/filter.h
+++ b/src/filter.h
@@ -65,14 +65,9 @@ create_pointer_accelator_filter(accel_profile_func_t filter);
  * Pointer acceleration profiles.
  */
 
-/*
- * Profile similar which is similar to nonaccelerated but with a smooth
- * transition between accelerated and non-accelerated.
- */
 double
-pointer_accel_profile_smooth_simple(struct motion_filter *filter,
-				    void *data,
-				    double velocity,
-				    uint64_t time);
-
+pointer_accel_profile_linear(struct motion_filter *filter,
+			     void *data,
+			     double speed_in,
+			     uint64_t time);
 #endif /* FILTER_H */