/*------------------------------------------------------------------------
 *  Copyright 2007-2009 (c) Jeff Brown <spadix@users.sourceforge.net>
 *
 *  This file is part of the ZBar Bar Code Reader.
 *
 *  The ZBar Bar Code Reader is free software; you can redistribute it
 *  and/or modify it under the terms of the GNU Lesser Public License as
 *  published by the Free Software Foundation; either version 2.1 of
 *  the License, or (at your option) any later version.
 *
 *  The ZBar Bar Code Reader 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 Lesser Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser Public License
 *  along with the ZBar Bar Code Reader; if not, write to the Free
 *  Software Foundation, Inc., 51 Franklin St, Fifth Floor,
 *  Boston, MA  02110-1301  USA
 *
 *  http://sourceforge.net/projects/zbar
 *------------------------------------------------------------------------*/
#ifndef _WINDOW_H_
#define _WINDOW_H_

#include "config.h"
#ifdef HAVE_INTTYPES_H
#include <inttypes.h>
#endif
#include <stdlib.h>

#include <zbar.h>
#include "error.h"
#include "mutex.h"
#include "symbol.h"

typedef struct window_state_s window_state_t;

struct zbar_window_s {
    errinfo_t err;	 /* error reporting */
    zbar_image_t *image; /* last displayed image
                                 * NB image access must be locked!
                                 */
    unsigned overlay;	 /* user set overlay level */

    uint32_t format;	    /* output format */
    unsigned width, height; /* current output size */
    unsigned max_width, max_height;

    uint32_t src_format; /* current input format */
    unsigned src_width;	 /* last displayed image size */
    unsigned src_height;

    unsigned dst_width; /* conversion target */
    unsigned dst_height;

    unsigned scale_num; /* output scaling */
    unsigned scale_den;

    point_t scaled_offset; /* output position and size */
    point_t scaled_size;

    uint32_t *formats; /* supported formats (zero terminated) */

    zbar_mutex_t imglock; /* lock displayed image */

    void *display;
    unsigned long xwin;
    unsigned long time;	    /* last image display in milliseconds */
    unsigned long time_avg; /* average of inter-frame times */

    window_state_t *state; /* platform/interface specific state */

    /* interface dependent methods */
    int (*init)(zbar_window_t *, zbar_image_t *, int);
    int (*draw_image)(zbar_window_t *, zbar_image_t *);
    int (*cleanup)(zbar_window_t *);
};

/* window.draw has to be thread safe wrt/other apis
 * FIXME should be a semaphore
 */
static inline int window_lock(zbar_window_t *w)
{
    int rc = 0;
    if ((rc = _zbar_mutex_lock(&w->imglock))) {
	err_capture(w, SEV_FATAL, ZBAR_ERR_LOCKING, __func__,
		    "unable to acquire lock");
	w->err.errnum = rc;
	return (-1);
    }
    return (0);
}

static inline int window_unlock(zbar_window_t *w)
{
    int rc = 0;
    if ((rc = _zbar_mutex_unlock(&w->imglock))) {
	err_capture(w, SEV_FATAL, ZBAR_ERR_LOCKING, __func__,
		    "unable to release lock");
	w->err.errnum = rc;
	return (-1);
    }
    return (0);
}

static inline int _zbar_window_add_format(zbar_window_t *w, uint32_t fmt)
{
    int i;
    for (i = 0; w->formats && w->formats[i]; i++)
	if (w->formats[i] == fmt)
	    return (i);

    w->formats	      = realloc(w->formats, (i + 2) * sizeof(uint32_t));
    w->formats[i]     = fmt;
    w->formats[i + 1] = 0;
    return (i);
}

static inline point_t window_scale_pt(zbar_window_t *w, point_t p)
{
    p.x = ((long)p.x * w->scale_num + w->scale_den - 1) / w->scale_den;
    p.y = ((long)p.y * w->scale_num + w->scale_den - 1) / w->scale_den;
    return (p);
}

/* PAL interface */
extern int _zbar_window_attach(zbar_window_t *, void *, unsigned long);
extern int _zbar_window_expose(zbar_window_t *, int, int, int, int);
extern int _zbar_window_resize(zbar_window_t *);
extern int _zbar_window_clear(zbar_window_t *);
extern int _zbar_window_begin(zbar_window_t *);
extern int _zbar_window_end(zbar_window_t *);
extern int _zbar_window_draw_marker(zbar_window_t *, uint32_t, point_t);
extern int _zbar_window_draw_polygon(zbar_window_t *, uint32_t, const point_t *,
				     int);
extern int _zbar_window_draw_text(zbar_window_t *, uint32_t, point_t,
				  const char *);
extern int _zbar_window_fill_rect(zbar_window_t *, uint32_t, point_t, point_t);
extern int _zbar_window_draw_logo(zbar_window_t *);

#endif
