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/*****************************************************************************
*
* grail - Gesture Recognition And Instantiation Library
*
* Copyright (C) 2010 Canonical Ltd.
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*
* Authors:
* Henrik Rydberg <rydberg@bitmath.org>
*
****************************************************************************/
#include <touch-engine.h>
#include <string.h>
static void tp_event(struct touch_dev *dev, const struct input_event *ev)
{
}
static void update_frame(struct touch_frame *frame,
int slot, int active,
const touch_prop_mask_t *mask,
const touch_prop_t *prop)
{
struct touch *touch = &frame->touch[slot];
touch->active = active;
if (mask && prop) {
for (int i = 0; i < DIM_TOUCH_PROP; i++)
if (has_prop(mask, i))
touch->prop[i] = prop[i];
}
}
static void finalize_frame(struct touch_frame *frame)
{
int last = -1;
frame->ntouch = 0;
frame->slot = -1;
for (int i = 0; i < DIM_TOUCH_PROP; i++) {
frame->touch[i].next = -1;
if (frame->touch[i].active) {
if (last < 0)
frame->slot = i;
else
frame->touch[last].next = i;
last = i;
frame->ntouch++;
}
}
}
static void tp_create(struct touch_dev *dev, int slot,
const touch_prop_mask_t *mask, const touch_prop_t *prop)
{
struct touch_engine *engine = dev->priv;
if (engine)
update_frame(&engine->frame, slot, 1, mask, prop);
}
static void tp_modify(struct touch_dev *dev, int slot,
const touch_prop_mask_t *mask, const touch_prop_t *prop)
{
struct touch_engine *engine = dev->priv;
if (engine)
update_frame(&engine->frame, slot, 1, mask, prop);
}
static void tp_destroy(struct touch_dev *dev, int slot)
{
struct touch_engine *engine = dev->priv;
if (engine)
update_frame(&engine->frame, slot, 0, 0, 0);
}
static void tp_sync(struct touch_dev *dev, touch_time_t time)
{
struct touch_engine *engine = dev->priv;
if (engine) {
finalize_frame(&engine->frame);
if (engine->sync)
engine->sync(engine, time);
}
}
void touch_engine_init(struct touch_engine *engine,
void (*sync)(struct touch_engine *engine,
touch_time_t time),
void *priv)
{
memset(engine, 0, sizeof(*engine));
engine->sync = sync;
engine->priv = priv;
}
void touch_engine_attach(struct touch_engine *engine, struct touch_dev *dev)
{
dev->priv = engine;
dev->event = tp_event;
dev->create = tp_create;
dev->modify = tp_modify;
dev->destroy = tp_destroy;
dev->sync = tp_sync;
}
void touch_engine_detach(struct touch_engine *engine, struct touch_dev *dev)
{
dev->sync = 0;
dev->destroy = 0;
dev->modify = 0;
dev->create = 0;
dev->event = 0;
dev->priv = 0;
}
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