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dix: add smooth limited pointer acceleration profile

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This profile is inspired by the accel code removed from the wacom driver.
It ascends from zero to acceleration, maxing out at threshold. This means you
can control the slope using threshold, which wasn't possible in wacom.
For sanity's sake, threshold should grow with acceleration.

Works best with adaptive deceleration, since otherwise it only generates
acceleration above 1, causing seldom pixel skips.

Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: Keith Packard <keithp@keithp.com>
This commit is contained in:
Simon Thum 2010-01-01 19:58:05 +01:00 • committed by Keith Packard
commit 1763550d01
2 changed files with 29 additions and 2 deletions
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3
include/ptrveloc.h
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@ -37,7 +37,8 @@
#define AccelProfileSimple 4
#define AccelProfilePower 5
#define AccelProfileLinear 6
#define AccelProfileLAST AccelProfileLinear
#define AccelProfileSmoothLimited 7
#define AccelProfileLAST AccelProfileSmoothLimited
/* fwd */
struct _DeviceVelocityRec;