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filter: drop constant acceleration

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This just moves a decimal point around, at the expense of making the approach
harder to understand. The only time the const acceleration matters is when
applied to the velocity but it only matters in relation to the threshold which
is a fixed number.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Peter Hutterer 2014-07-08 12:09:20 +10:00
parent b908e070e9
commit 14ba84cdca
1 changed files with 3 additions and 5 deletions
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8
src/filter.c
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@ -51,8 +51,7 @@ filter_destroy(struct motion_filter *filter)
* Default parameters for pointer acceleration profiles.
*/
#define DEFAULT_CONSTANT_ACCELERATION 10.0 /* unitless factor */
#define DEFAULT_THRESHOLD 4.0 /* in units/ms */
#define DEFAULT_THRESHOLD 0.4 /* in units/ms */
#define DEFAULT_ACCELERATION 2.0 /* unitless factor */
/*
@ -337,12 +336,11 @@ pointer_accel_profile_smooth_simple(struct motion_filter *filter,
double smooth_accel_coefficient; /* unitless factor */
double factor; /* unitless factor */
if (threshold < 1.0)
threshold = 1.0;
if (threshold < 0.1)
threshold = 0.1;
if (accel < 1.0)
accel = 1.0;
velocity *= DEFAULT_CONSTANT_ACCELERATION;
if (velocity < (threshold / 2.0))
return calc_penumbral_gradient(0.5 + velocity / threshold) * 2.0 - 1.0;