xf86-input-libinput: Changes to 'master'

[Peter Hutterer]

 include/libinput-properties.h |    7 +
 man/libinput.man              |   30 ++++++
 src/Makefile.am               |    5 -
 src/bezier.c                  |  177 +++++++++++++++++++++++++++++++++++++
 src/bezier.h                  |   69 ++++++++++++++
 src/xf86libinput.c            |  184 ++++++++++++++++++++++++++++++++++++++
 test/Makefile.am              |    5 -
 test/test-bezier.c            |  199 ++++++++++++++++++++++++++++++++++++++++++
 8 files changed, 671 insertions(+), 5 deletions(-)

New commits:
commit 5d0470738125243c98f7a8cc40d62f53604a8051
Author: Peter Hutterer <peter.hutterer at who-t.net>
Date:   Mon Oct 24 14:41:51 2016 +1000

    Implement stylus pressure curve support
    
    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 <peter.hutterer at who-t.net>

commit f65a5c50224efc34414f44c86700e15392b7039b
Author: Peter Hutterer <peter.hutterer at who-t.net>
Date:   Wed Oct 26 11:57:49 2016 +1000

    Add a bezier curve implementation
    
    Needed for the wacom stylus pressure curve
    
    Signed-off-by: Peter Hutterer <peter.hutterer at who-t.net>