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#include "state.h"
#include <stdlib.h>
#include <limits.h>
const double FTW = 0.1;
const double FTS = 0.1;
/******************************************************/
void init_state(struct State *s)
{
memset(s, 0, sizeof(struct State));
}
/******************************************************/
static int fincmp(const void* a,const void* b)
{
return ((struct FingerState *)a)->id - ((struct FingerState *)b)->id;
}
inline float dist2(const struct FingerData* a,const struct FingerData* b)
{
float dx = a->position_x - b->position_x;
float dy = a->position_y - b->position_y;
return dx * dx + dy * dy;
}
static void set_finger(struct FingerState* fs,
const struct FingerData* hw, int id,
const struct Capabilities* caps)
{
fs->hw = *hw;
fs->id = id;
if (!caps->has_touch_minor)
fs->hw.touch_minor = hw->touch_major;
if (!caps->has_width_minor)
fs->hw.width_minor = hw->width_major;
}
static bool touching_finger(const struct FingerData* hw,
const struct Capabilities* caps)
{
if (caps->has_touch_major && caps->has_width_major)
return hw->width_major > 0 &&
hw->touch_major > FTW * hw->width_major;
if (caps->has_touch_major)
hw->touch_major > FTS * caps->abs_touch_major.maximum;
return 1;
}
/******************************************************/
void modify_state(struct State *s,
const struct HWData* hw,
const struct Capabilities* caps)
{
float A[DIM2_FINGER], *row;
int sid[DIM_FINGER], hw2s[DIM_FINGER];
int id, sk, hwk;
/* setup distance matrix for finger id matching */
for (sk = 0; sk < s->nfinger; sk++) {
sid[sk] = s->finger[sk].id;
row = A + hw->nfinger * sk;
for (hwk = 0; hwk < hw->nfinger; hwk++)
row[hwk] = dist2(&hw->finger[hwk], &s->finger[sk].hw);
}
match_fingers(hw2s, A, hw->nfinger, s->nfinger);
/* update matched fingers and create new ones */
for (hwk = 0; hwk < hw->nfinger; hwk++) {
sk = hw2s[hwk];
id = sk >= 0 ? sid[sk] : 0;
if (!touching_finger(&hw->finger[hwk], caps))
id = 0;
else while (!id)
id = ++s->lastid;
set_finger(&s->finger[hwk], &hw->finger[hwk], id, caps);
}
s->button = hw->button;
s->nfinger = hw->nfinger;
/* sort fingers in touching order */
qsort(s->finger, s->nfinger, sizeof(struct FingerState), fincmp);
}
/******************************************************/
const struct FingerState *find_finger(const struct State *s, int id)
{
int i;
if (!id)
return NULL;
for (i = 0; i < s->nfinger; i++)
if (s->finger[i].id == id)
return s->finger + i;
return NULL;
}
/******************************************************/
int count_fingers(const struct State *s)
{
int i, n = 0;
for (i = 0; i < s->nfinger; i++)
if (s->finger[i].id)
n++;
return n;
}
/******************************************************/
void output_state(const struct State *s)
{
int i;
xf86Msg(X_INFO, "buttons: %d%d%d\n",
GETBIT(s->button, MT_BUTTON_LEFT),
GETBIT(s->button, MT_BUTTON_MIDDLE),
GETBIT(s->button, MT_BUTTON_RIGHT));
xf86Msg(X_INFO, "fingers: %d\n",
s->nfinger);
for (i = 0; i < s->nfinger; i++) {
xf86Msg(X_INFO,
" %+02d %+05d:%+05d +%05d:%+05d %+06d %+05d:%+05d\n",
s->finger[i].id,
s->finger[i].hw.touch_major,
s->finger[i].hw.touch_minor,
s->finger[i].hw.width_major,
s->finger[i].hw.width_minor,
s->finger[i].hw.orientation,
s->finger[i].hw.position_x,
s->finger[i].hw.position_y);
}
}
/******************************************************/
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