LICENSE

File content as of revision 1:500d42699c34:

/*------------------------------------------------------------------------
 *  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 "symbol.h"
#include "error.h"
#include "mutex.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