[PATCH libinput 2/5] filter: use a separate variable for the final accel factor

[Peter Hutterer]

velocity is in unit/ms, the threshold is in units/ms. Once we divide
velocity/threshold, we're not in units/ms anymore but have a unitless factor.
Use a separate variable to avoid confusion.

Signed-off-by: Peter Hutterer <peter.hutterer at who-t.net>
---
 src/filter.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/src/filter.c b/src/filter.c
index 7db78ba..141b4a9 100644
--- a/src/filter.c
+++ b/src/filter.c
@@ -335,6 +335,7 @@ pointer_accel_profile_smooth_simple(struct motion_filter *filter,
 	double threshold = DEFAULT_THRESHOLD; /* units/ms */
 	double accel = DEFAULT_ACCELERATION; /* unitless factor */
 	double smooth_accel_coefficient; /* unitless factor */
+	double factor; /* unitless factor */
 
 	if (threshold < 1.0)
 		threshold = 1.0;
@@ -349,12 +350,12 @@ pointer_accel_profile_smooth_simple(struct motion_filter *filter,
 	if (velocity <= threshold)
 		return 1.0;
 
-	velocity /= threshold;
-	if (velocity >= accel)
+	factor = velocity/threshold;
+	if (factor >= accel)
 		return accel;
 
-	/* Velocity is between 1.0 and accel, scale this to 0.0 - 1.0 */
-	velocity = (velocity - 1.0) / (accel - 1.0);
-	smooth_accel_coefficient = calc_penumbral_gradient(velocity);
+	/* factor is between 1.0 and accel, scale this to 0.0 - 1.0 */
+	factor = (factor - 1.0) / (accel - 1.0);
+	smooth_accel_coefficient = calc_penumbral_gradient(factor);
 	return 1.0 + (smooth_accel_coefficient * (accel - 1.0));
 }
-- 
1.9.3