diff options
Diffstat (limited to 'src/filter.c')
| -rw-r--r-- | src/filter.c | 34 |
1 files changed, 30 insertions, 4 deletions
diff --git a/src/filter.c b/src/filter.c index 3845c7ff..c54d866c 100644 --- a/src/filter.c +++ b/src/filter.c @@ -144,6 +144,24 @@ calculate_tracker_velocity(struct pointer_tracker *tracker, uint64_t time) return normalized_length(tracker->delta) / tdelta; /* units/ms */ } +static inline double +calculate_velocity_after_timeout(struct pointer_tracker *tracker) +{ + /* First movement after timeout needs special handling. + * + * When we trigger the timeout, the last event is too far in the + * past to use it for velocity calculation across multiple tracker + * values. + * + * Use the motion timeout itself to calculate the speed rather than + * the last tracker time. This errs on the side of being too fast + * for really slow movements but provides much more useful initial + * movement in normal use-cases (pause, move, pause, move) + */ + return calculate_tracker_velocity(tracker, + tracker->time + MOTION_TIMEOUT); +} + static double calculate_velocity(struct pointer_accelerator *accel, uint64_t time) { @@ -163,15 +181,23 @@ calculate_velocity(struct pointer_accelerator *accel, uint64_t time) /* Stop if too far away in time */ if (time - tracker->time > MOTION_TIMEOUT || - tracker->time > time) + tracker->time > time) { + if (offset == 1) + result = calculate_velocity_after_timeout(tracker); break; + } + + velocity = calculate_tracker_velocity(tracker, time); /* Stop if direction changed */ dir &= tracker->dir; - if (dir == 0) + if (dir == 0) { + /* First movement after dirchange - velocity is that + * of the last movement */ + if (offset == 1) + result = velocity; break; - - velocity = calculate_tracker_velocity(tracker, time); + } if (initial_velocity == 0.0) { result = initial_velocity = velocity; |