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touchpad: hook up the pointer acceleration

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Same algorithm as in evdev-touchpad.c

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
This commit is contained in:
Peter Hutterer 2014-02-06 19:43:48 +10:00
parent e75a0430be
commit 8d867a2b8a
1 changed files with 76 additions and 0 deletions
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76
src/evdev-mt-touchpad.c
View file

@ -27,7 +27,11 @@
#include <stdbool.h>
#include "evdev.h"
#include "filter.h"
#define DEFAULT_CONSTANT_ACCEL_NUMERATOR 50
#define DEFAULT_MIN_ACCEL_FACTOR 0.16
#define DEFAULT_MAX_ACCEL_FACTOR 1.0
#define DEFAULT_HYSTERESIS_MARGIN_DENOMINATOR 700.0
#define TOUCHPAD_HISTORY_LENGTH 4
@ -78,6 +82,14 @@ struct tp_dispatch {
int32_t margin_x;
int32_t margin_y;
} hysteresis;
struct motion_filter *filter;
struct {
double constant_factor;
double min_factor;
double max_factor;
} accel;
};
static inline int
@ -94,6 +106,27 @@ tp_hysteresis(int in, int center, int margin)
return center + diff;
}
static double
tp_accel_profile(struct motion_filter *filter,
void *data,
double velocity,
uint32_t time)
{
struct tp_dispatch *tp =
(struct tp_dispatch *) data;
double accel_factor;
accel_factor = velocity * tp->accel.constant_factor;
if (accel_factor > tp->accel.max_factor)
accel_factor = tp->accel.max_factor;
else if (accel_factor < tp->accel.min_factor)
accel_factor = tp->accel.min_factor;
return accel_factor;
}
static inline struct tp_motion *
tp_motion_history_offset(struct tp_touch *t, int offset)
{
@ -104,6 +137,21 @@ tp_motion_history_offset(struct tp_touch *t, int offset)
return &t->history.samples[offset_index];
}
static void
tp_filter_motion(struct tp_dispatch *tp,
double *dx, double *dy, uint32_t time)
{
struct motion_params motion;
motion.dx = *dx;
motion.dy = *dy;
filter_dispatch(tp->filter, &motion, tp, time);
*dx = motion.dx;
*dy = motion.dy;
}
static inline void
tp_motion_history_push(struct tp_touch *t)
{
@ -292,7 +340,12 @@ tp_post_events(struct tp_dispatch *tp, uint32_t time)
if (tp->nfingers_down != 1)
return;
if (t->history.count < 4)
return;
tp_get_delta(t, &dx, &dy);
tp_filter_motion(tp, &dx, &dy, time);
if (dx != 0 || dy != 0)
pointer_notify_motion(
@ -332,6 +385,8 @@ tp_destroy(struct evdev_dispatch *dispatch)
struct tp_dispatch *tp =
(struct tp_dispatch*)dispatch;
if (tp->filter)
tp->filter->interface->destroy(tp->filter);
free(tp->touches);
free(tp);
}
@ -357,6 +412,24 @@ tp_init_slots(struct tp_dispatch *tp,
return 0;
}
static int
tp_init_accel(struct tp_dispatch *touchpad, double diagonal)
{
struct motion_filter *accel;
touchpad->accel.constant_factor =
DEFAULT_CONSTANT_ACCEL_NUMERATOR / diagonal;
touchpad->accel.min_factor = DEFAULT_MIN_ACCEL_FACTOR;
touchpad->accel.max_factor = DEFAULT_MAX_ACCEL_FACTOR;
accel = create_pointer_accelator_filter(tp_accel_profile);
if (accel == NULL)
return -1;
touchpad->filter = accel;
return 0;
}
static int
tp_init(struct tp_dispatch *tp,
@ -380,6 +453,9 @@ tp_init(struct tp_dispatch *tp,
tp->hysteresis.margin_y =
diagonal / DEFAULT_HYSTERESIS_MARGIN_DENOMINATOR;
if (tp_init_accel(tp, diagonal) != 0)
return -1;
return 0;
}