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dix: don't pass the index for a tracker around, pass the tracker 

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Daniel Stone <daniel@fooishbar.org>
Reviewed-by: Jamey Sharp <jamey@minilop.net>
Reviewed-by: Simon Thum <simon.thum@gmx.de>
This commit is contained in:
Peter Hutterer 2011-04-20 14:44:51 +10:00
parent 9e8645cacf
commit 6b3a4cc6af
1 changed files with 11 additions and 10 deletions
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21
dix/ptrveloc.c
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@ -546,6 +546,7 @@ GetDirection(int dx, int dy){
/* convert offset (age) to array index */
#define TRACKER_INDEX(s, d) (((s)->num_tracker + (s)->cur_tracker - (d)) % (s)->num_tracker)
#define TRACKER(s, d) &(s)->tracker[TRACKER_INDEX(s,d)]
static inline void
FeedTrackers(DeviceVelocityPtr vel, int dx, int dy, int cur_t)
@ -589,15 +590,15 @@ CalcTracker(const MotionTracker *tracker, int cur_t){
*/
static float
QueryTrackers(DeviceVelocityPtr vel, int cur_t){
int n, offset, dir = UNDEFINED, i = -1, age_ms;
int offset, dir = UNDEFINED, i = -1, age_ms;
/* initial velocity: a low-offset, valid velocity */
float iveloc = 0, res = 0, tmp, vdiff;
float vfac = vel->corr_mul * vel->const_acceleration; /* premultiply */
/* loop from current to older data */
for(offset = 1; offset < vel->num_tracker; offset++){
n = TRACKER_INDEX(vel, offset);
MotionTracker *tracker = TRACKER(vel, offset);
age_ms = cur_t - vel->tracker[n].time;
age_ms = cur_t - tracker->time;
/* bail out if data is too old and protect from overrun */
if (age_ms >= vel->reset_time || age_ms < 0) {
@ -611,7 +612,7 @@ QueryTrackers(DeviceVelocityPtr vel, int cur_t){
* even more precision we could subdivide as a final step, so possible
* non-linearities are accounted for.
*/
dir &= vel->tracker[n].dir;
dir &= tracker->dir;
if(dir == 0){
DebugAccelF("(dix prtacc) query: no longer linear\n");
/* instead of breaking it we might also inspect the partition after,
@ -619,7 +620,7 @@ QueryTrackers(DeviceVelocityPtr vel, int cur_t){
break;
}
tmp = CalcTracker(&vel->tracker[n], cur_t) * vfac;
tmp = CalcTracker(tracker, cur_t) * vfac;
if ((iveloc == 0 || offset <= vel->initial_range) && tmp != 0) {
/* set initial velocity and result */
@ -647,18 +648,18 @@ QueryTrackers(DeviceVelocityPtr vel, int cur_t){
DebugAccelF("(dix prtacc) query: last tracker in effect\n");
i = vel->num_tracker-1;
}
#ifdef PTRACCEL_DEBUGGING
if(i>=0){
n = TRACKER_INDEX(vel, i);
MotionTracker *tracker = TRACKER(vel, i);
DebugAccelF("(dix prtacc) result: offset %i [dx: %i dy: %i diff: %i]\n",
i,
vel->tracker[n].dx,
vel->tracker[n].dy,
cur_t - vel->tracker[n].time);
i, tracker->dx, tracker->dy, cur_t - tracker->time);
}
#endif
return res;
}
#undef TRACKER_INDEX
#undef TRACKER
/**
* Perform velocity approximation based on 2D 'mickeys' (mouse motion delta).