diff options
| author | Simon Thum <simon.thum@gmx.de> | 2008-07-23 11:49:36 +0200 |
|---|---|---|
| committer | Peter Hutterer <peter.hutterer@who-t.net> | 2008-07-28 18:13:19 +0930 |
| commit | 1a9f9ac50f2b0db735789905cc29572a50c8ae4c (patch) | |
| tree | cce728d4ae9d01f5984af3bcfef471fdf5d0a097 /include/ptrveloc.h | |
| parent | c184b91d9aa72031c2bac9f379f56633957ded30 (diff) | |
dix: optimize precision in device velocity estimation
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Diffstat (limited to 'include/ptrveloc.h')
| -rw-r--r-- | include/ptrveloc.h | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/include/ptrveloc.h b/include/ptrveloc.h index 8e56e4d47..2d42dda29 100644 --- a/include/ptrveloc.h +++ b/include/ptrveloc.h @@ -27,6 +27,9 @@ #include <input.h> /* DeviceIntPtr */ +/* maximum number of filters to approximate velocity. + * ABI-breaker! + */ #define MAX_VELOCITY_FILTERS 8 /* constants for acceleration profiles; @@ -53,7 +56,7 @@ typedef float (*PointerAccelerationProfileFunc) float /*threshold*/, float /*acc*/); /** - * a filter stage contains the data for the adaptive IIR filtering. + * a filter stage contains the data for adaptive IIR filtering. * To improve results, one may run several parallel filters * which have different decays. Since more integration means more * delay, a given filter only does good matches in a specific phase of @@ -77,7 +80,8 @@ typedef struct _DeviceVelocityRec { float velocity; /* velocity as guessed by algorithm */ int lrm_time; /* time the last motion event was processed */ int last_dx, last_dy; /* last motion delta */ - int last_diff; /* last time-diff */ + int last_diff; /* last time-difference */ + Bool last_reset; /* whether a nv-reset occurred just before */ float corr_mul; /* config: multiply this into velocity */ float const_acceleration; /* config: (recipr.) const deceleration */ float min_acceleration; /* config: minimum acceleration */ @@ -89,7 +93,7 @@ typedef struct _DeviceVelocityRec { void* profile_private;/* extended data, see SetAccelerationProfile() */ struct { /* to be able to query this information */ int profile_number; - int filter_usecount[MAX_VELOCITY_FILTERS]; + int filter_usecount[MAX_VELOCITY_FILTERS +1]; } statistics; } DeviceVelocityRec, *DeviceVelocityPtr; |