/*
* Initialize plane_index and (if appropriate) wanted and
* wanted_varies at the beginning of a group of planes.
*/
static void
begin_planes(gs_image_enum *penum)
{
cache_planes(penum);
penum->plane_index = -1;
next_plane(penum);
}
/* Process the next piece of an image. */
int
gs_image_next(gs_image_enum * penum, const byte * dbytes, uint dsize,
uint * pused)
{
int px = penum->plane_index;
int num_planes = penum->num_planes;
int i, code;
uint used[GS_IMAGE_MAX_COMPONENTS];
gs_const_string plane_data[GS_IMAGE_MAX_COMPONENTS];
if (penum->planes[px].source.size != 0)
return_error(gs_error_rangecheck);
for (i = 0; i < num_planes; i++)
plane_data[i].size = 0;
plane_data[px].data = dbytes;
plane_data[px].size = dsize;
penum->error = false;
code = gs_image_next_planes(penum, plane_data, used);
*pused = used[px];
if (code >= 0)
next_plane(penum);
return code;
}
int
addplane(void)
{
PLANE p, *pp, *p1;
int i, num_starts, close, rnd, rnd2, pnum;
memset(&p, 0, sizeof (p));
p.status = S_MARKED;
p.plane_type = atcrandom() % 2;
num_starts = sp->num_exits + sp->num_airports;
rnd = atcrandom() % num_starts;
if (rnd < sp->num_exits) {
p.dest_type = T_EXIT;
p.dest_no = rnd;
} else {
p.dest_type = T_AIRPORT;
p.dest_no = rnd - sp->num_exits;
}
/* loop until we get a plane not near another */
for (i = 0; i < num_starts; i++) {
/* loop till we get a different start point */
while ((rnd2 = atcrandom() % num_starts) == rnd)
;
if (rnd2 < sp->num_exits) {
p.orig_type = T_EXIT;
p.orig_no = rnd2;
p.xpos = sp->exit[rnd2].x;
p.ypos = sp->exit[rnd2].y;
p.new_dir = p.dir = sp->exit[rnd2].dir;
p.altitude = p.new_altitude = 7;
close = 0;
for (p1 = air.head; p1 != NULL; p1 = p1->next)
if (too_close(p1, &p, 4)) {
close++;
break;
}
if (close)
continue;
} else {
p.orig_type = T_AIRPORT;
p.orig_no = rnd2 - sp->num_exits;
p.xpos = sp->airport[p.orig_no].x;
p.ypos = sp->airport[p.orig_no].y;
p.new_dir = p.dir = sp->airport[p.orig_no].dir;
p.altitude = p.new_altitude = 0;
}
p.fuel = sp->width + sp->height;
break;
}
if (i >= num_starts)
return (-1);
pnum = next_plane();
if (pnum < 0)
return (-1);
p.plane_no = pnum;
pp = newplane();
memcpy(pp, &p, sizeof (p));
if (pp->orig_type == T_AIRPORT)
append(&ground, pp);
else
append(&air, pp);
return (pp->dest_type);
}
