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Peter Hutterer 4913fd7a48 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>
2014-09-23 10:46:22 +10:00
doc touchpad: Route top softbuttons through the trackstick if we've one 2014-09-19 08:20:00 +10:00
include/linux evdev: Add middle button scrolling for trackpoints 2014-09-18 13:29:42 +10:00
m4 Port evdev code to be used as a shared library 2013-11-12 22:37:20 +01:00
src Replace pointer acceleration with a much simpler linear one 2014-09-23 10:46:22 +10:00
test test: Add trackpoint middlebutton scrolling tests 2014-09-22 10:59:29 +10:00
tools Use -no-install instead of -static for local noinst linking 2014-08-25 07:57:43 +10:00
.gitignore Add the framework for a test suite 2014-01-10 14:17:06 +10:00
autogen.sh Port evdev code to be used as a shared library 2013-11-12 22:37:20 +01:00
configure.ac configure.ac: libinput 0.6 2014-09-11 22:32:51 +02:00
COPYING test: Test seat wide button and key count helpers 2014-04-23 00:07:40 +02:00
Makefile.am test: automatically run the tests against valgrind for leaks 2014-04-10 11:11:56 +10:00
README Update README 2014-02-26 19:50:37 +01:00

README 

libinput

libinput is a library that handles input devices for display servers and other
applications that need to directly deal with input devices.

It provides device detection, device handling, input device event processing
and abstraction so minimize the amount of custom input code the user of
libinput need to provide the common set of functionality that users expect.

Input event processing includes scaling touch coordinates, generating
pointer events from touchpads, pointer acceleration, etc.

libinput originates from weston, the Wayland reference compositor.

The source code of libinput can be found at:
http://cgit.freedesktop.org/wayland/libinput

For more information, visit:
http://www.freedesktop.org/wiki/Software/libinput/