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/***************************************************************************
*
* Multitouch X driver
* Copyright (C) 2008 Henrik Rydberg <rydberg@euromail.se>
*
* Gestures
* Copyright (C) 2008 Henrik Rydberg <rydberg@euromail.se>
* Copyright (C) 2010 Arturo Castro <mail@arturocastro.net>
*
* 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 "gestures.h"
static const int FINGER_THUMB_MS = 400;
static const int BUTTON_HOLD_MS = 200;
/**
* extract_buttons
*
* Set the button gesture.
*
* Reset memory after use.
*
*/
static void extract_buttons(struct Gestures *gs, struct MTouch* mt)
{
unsigned btdata = mt->state.button & BITONES(DIM_BUTTON);
int npoint = bitcount(mt->mem.pointing);
if (mt->state.button == BITMASK(MT_BUTTON_LEFT)) {
if (npoint == 2)
btdata = BITMASK(MT_BUTTON_RIGHT);
if (npoint == 3)
btdata = BITMASK(MT_BUTTON_MIDDLE);
}
if (mt->state.button != mt->prev_state.button) {
gs->btmask = (btdata ^ mt->mem.btdata) & BITONES(DIM_BUTTON);
gs->btdata = btdata;
mt->mem.btdata = btdata;
}
if (gs->btmask) {
mt_delay_movement(mt, BUTTON_HOLD_MS);
SETBIT(gs->type, GS_BUTTON);
}
}
/**
* extract_movement
*
* Set the movement gesture.
*
* Reset memory after use.
*
*/
static void extract_movement(struct Gestures *gs, struct MTouch* mt)
{
int npoint = bitcount(mt->mem.pointing);
int nmove = bitcount(mt->mem.moving);
int i;
float xm[DIM_FINGER], ym[DIM_FINGER];
float xmove = 0, ymove = 0;
if (!nmove || nmove != npoint)
return;
foreach_bit(i, mt->mem.moving) {
xm[i] = mt->mem.dx[i];
ym[i] = mt->mem.dy[i];
mt->mem.dx[i] = 0;
mt->mem.dy[i] = 0;
xmove += xm[i];
ymove += ym[i];
}
xmove /= nmove;
ymove /= nmove;
if (nmove == 1) {
if (mt->mem.moving & mt->mem.thumb) {
mt_skip_movement(mt, FINGER_THUMB_MS);
return;
}
gs->dx = xmove;
gs->dy = ymove;
if (gs->dx || gs->dy)
SETBIT(gs->type, GS_MOVE);
} else {
if (mt->mem.moving & mt->mem.thumb) {
mt_skip_movement(mt, FINGER_THUMB_MS);
return;
}
gs->dx = xmove;
gs->dy = ymove;
if (abs(gs->dx) > abs(gs->dy)) {
if (nmove == 2)
SETBIT(gs->type, GS_HSCROLL);
if (nmove == 3)
SETBIT(gs->type, GS_HSWIPE);
}
if (abs(gs->dy) > abs(gs->dx)) {
if (nmove == 2)
SETBIT(gs->type, GS_VSCROLL);
if (nmove == 3)
SETBIT(gs->type, GS_VSWIPE);
}
}
}
/**
* extract_gestures
*
* Extract the gestures.
*
* Reset memory after use.
*
*/
void extract_gestures(struct Gestures *gs, struct MTouch* mt)
{
memset(gs, 0, sizeof(struct Gestures));
gs->same_fingers = mt->mem.same;
extract_buttons(gs, mt);
extract_movement(gs, mt);
mt->prev_state = mt->state;
}
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