#include <assert.h>
#include <math.h>
#include <stdbool.h>
+#include <limits.h>
#include "evdev-mt-touchpad.h"
tp_palm_detect(struct tp_dispatch *tp, struct tp_touch *t, uint64_t time)
{
const int PALM_TIMEOUT = 200; /* ms */
+ const int DIRECTIONS = NE|E|SE|SW|W|NW;
/* If labelled a touch as palm, we unlabel as palm when
- we move out of the palm edge zone within the timeout.
+ we move out of the palm edge zone within the timeout, provided
+ the direction is within 45 degrees of the horizontal.
*/
if (t->palm.is_palm) {
if (time < t->palm.time + PALM_TIMEOUT &&
(t->x > tp->palm.left_edge && t->x < tp->palm.right_edge)) {
- t->palm.is_palm = false;
- tp_set_pointer(tp, t);
+ int dirs = vector_get_direction(t->x - t->palm.x, t->y - t->palm.y);
+ if ((dirs & DIRECTIONS) && !(dirs & ~DIRECTIONS)) {
+ t->palm.is_palm = false;
+ tp_set_pointer(tp, t);
+ }
}
return;
}
t->palm.is_palm = true;
t->palm.time = time;
+ t->palm.x = t->x;
+ t->palm.y = t->y;
}
static void
{
int width;
+ tp->palm.right_edge = INT_MAX;
+ tp->palm.left_edge = INT_MIN;
+
+ /* We don't know how big the touchpad is */
+ if (device->abs.absinfo_x->resolution == 1)
+ return 0;
+
width = abs(device->abs.absinfo_x->maximum -
device->abs.absinfo_x->minimum);
+ /* Enable palm detection on touchpads >= 80 mm. Anything smaller
+ probably won't need it, until we find out it does */
+ if (width/device->abs.absinfo_x->resolution < 80)
+ return 0;
+
/* palm edges are 5% of the width on each side */
tp->palm.right_edge = device->abs.absinfo_x->maximum - width * 0.05;
tp->palm.left_edge = device->abs.absinfo_x->minimum + width * 0.05;