/*****************************************************************************
 *
 * 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>
 *
 ****************************************************************************/

#ifndef _GRAIL_H
#define _GRAIL_H

#include <linux/input.h>

#define GRAIL_STATUS_BEGIN	0
#define GRAIL_STATUS_UPDATE	1
#define GRAIL_STATUS_END	2

#define DIM_GRAIL_TYPE		64
#define DIM_GRAIL_TYPE_BYTES	(DIM_GRAIL_TYPE >> 3)

#define GRAIL_TYPE_MOVE		0
#define GRAIL_TYPE_VSCROLL	1
#define GRAIL_TYPE_HSCROLL	2
#define GRAIL_TYPE_SCROLL	3

#define DIM_GRAIL_PROP		8

static const int GRAIL_NPROP[] = {
	2,	/* MOVE */
	1,	/* VSCROLL */
	1,	/* HSCROLL */
	2,	/* SCROLL */
};

typedef unsigned char grail_mask_t;
typedef int grail_prop_t;
typedef __u64 grail_time_t;

static inline void grail_set_mask(grail_mask_t *mask, int i)
{
	mask[i >> 3] |= (1 << (i & 7));
}

static inline void grail_clear_mask(grail_mask_t *mask, int i)
{
	mask[i >> 3] &= ~(1 << (i & 7));
}

static inline int grail_get_mask(const grail_mask_t *mask, int i)
{
	return (mask[i >> 3] >> (i & 7)) & 1;
}

struct grail_coord {
	int x, y;
};

struct grail_client_id {
	int client;
	int root, event, child;
};

struct grail_client_info {
	struct grail_client_id id;
	grail_mask_t mask[DIM_GRAIL_TYPE_BYTES];
};

struct grail_event {
	int type;
	int id;
	int status;
	struct grail_coord pos;
	struct grail_client_id client_id;
	grail_time_t time;
	grail_prop_t prop[DIM_GRAIL_PROP];
};

struct grail {
	int (*get_clients)(struct grail *ge,
			   struct grail_client_info *client, int max_clients,
			   const struct grail_coord *coords, int num_coords,
			   const grail_mask_t *types);
	void (*event)(struct grail *ge,
		      const struct input_event *ev);
	void (*gesture)(struct grail *ge,
			const struct grail_event *ev);
	struct grail_impl *impl;
	struct gesture_inserter *gin;
	struct gesture_recognizer *gru;
	void *priv;
};

int grail_open(struct grail *ge, int fd);
int grail_idle(struct grail *ge, int fd, int ms);
int grail_pull(struct grail *ge, int fd);
void grail_close(struct grail *ge, int fd);

#endif