filter: constify the tracker API

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

diff --git a/src/filter.c b/src/filter.c
index 28df814..80d453b 100644 (file)
--- a/src/filter.c
+++ b/src/filter.c
@@ -160,9 +160,9 @@ trackers_by_offset(struct pointer_trackers *trackers, unsigned int offset)
 }
 
 static double
-calculate_trackers_velocity(struct pointer_tracker *tracker,
-                          uint64_t time,
-                          struct pointer_delta_smoothener *smoothener)
+calculate_trackers_velocity(const struct pointer_tracker *tracker,
+                           uint64_t time,
+                           struct pointer_delta_smoothener *smoothener)
 {
        uint64_t tdelta = time - tracker->time + 1;
 
@@ -174,8 +174,8 @@ calculate_trackers_velocity(struct pointer_tracker *tracker,
 }
 
 static double
-trackers_velocity_after_timeout(struct pointer_tracker *tracker,
-                                struct pointer_delta_smoothener *smoothener)
+trackers_velocity_after_timeout(const struct pointer_tracker *tracker,
+                               struct pointer_delta_smoothener *smoothener)
 {
        /* First movement after timeout needs special handling.
         *