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/***************************************************************************
*
* Multitouch X driver
* Copyright (C) 2008 Henrik Rydberg <rydberg@euromail.se>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
**************************************************************************/
#include "hwstate.h"
#include <stdlib.h>
#include <limits.h>
const int XMAX = 32767;
void init_hwstate(struct HWState *s)
{
memset(s, 0, sizeof(struct HWState));
}
static inline int clamp15(int x)
{
return x < -XMAX ? -XMAX : x > XMAX ? XMAX : x;
}
/* abslute scale is assumed to fit in 15 bits */
inline int dist2(const struct FingerData *a, const struct FingerData *b)
{
int dx = clamp15(a->position_x - b->position_x);
int dy = clamp15(a->position_y - b->position_y);
return dx * dx + dy * dy;
}
/* Dmitry Torokhov's code from kernel/driver/input/input.c */
static int defuzz(int value, int old_val, int fuzz)
{
if (fuzz) {
if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2)
return old_val;
if (value > old_val - fuzz && value < old_val + fuzz)
return (old_val * 3 + value) / 4;
if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2)
return (old_val + value) / 2;
}
return value;
}
static void set_finger(struct FingerState *fs,
const struct FingerData *hw, int id,
const struct Capabilities *caps)
{
int x = defuzz(hw->position_x, fs->hw.position_x, caps->xfuzz);
int y = defuzz(hw->position_y, fs->hw.position_y, caps->yfuzz);
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;
fs->hw.position_x = x;
fs->hw.position_y = y;
}
void modify_hwstate(struct HWState *s,
const struct HWData *hw,
const struct Capabilities *caps)
{
int 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;
while (!id)
id = ++s->lastid;
set_finger(&s->finger[hwk], &hw->finger[hwk], id, caps);
}
s->button = hw->button;
s->nfinger = hw->nfinger;
s->evtime = hw->evtime;
}
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