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dix: optimize precision in device velocity estimation

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Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
This commit is contained in:
Simon Thum
2008-07-23 11:49:36 +02:00
committed by Peter Hutterer
parent c184b91d9a
commit 1a9f9ac50f
2 changed files with 70 additions and 28 deletions
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10
include/ptrveloc.h
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@@ -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;