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rview.c
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Thu, Jun 27, 10:54

rview.c
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#ifndef lint
static const char RCSid[] = "$Id: rview.c,v 2.37 2013/10/18 17:04:13 greg Exp $";
#endif
/*
* rview.c - routines and variables for interactive view generation.
*
* External symbols declared in rpaint.h
*/
#include "copyright.h"
#include <signal.h>
#include <ctype.h>
#include "ray.h"
#include "rpaint.h"
#define CTRL(c) ((c)-'@')
void
quit(code) /* quit program */
int code;
{
if (ray_pnprocs > 0) /* close children if any */
ray_pclose(0);
if (!ray_pnprocs) /* in parent */
devclose();
exit(code);
}
void
devopen( /* open device driver */
char *dname
)
{
extern char *progname, *octname;
char *id;
int i;
id = octname!=NULL ? octname : progname;
/* check device table */
for (i = 0; devtable[i].name; i++)
if (!strcmp(dname, devtable[i].name)) {
if ((dev = (*devtable[i].init)(dname, id)) == NULL) {
sprintf(errmsg, "cannot initialize %s", dname);
error(USER, errmsg);
} else
return;
}
/* not there, try exec */
if ((dev = comm_init(dname, id)) == NULL) {
sprintf(errmsg, "cannot start device \"%s\"", dname);
error(USER, errmsg);
}
}
void
devclose(void) /* close our device */
{
if (dev != NULL)
(*dev->close)();
dev = NULL;
}
void
printdevices(void) /* print list of output devices */
{
int i;
for (i = 0; devtable[i].name; i++)
printf("%-16s # %s\n", devtable[i].name, devtable[i].descrip);
}
void
rview(void) /* do a view */
{
char buf[32];
devopen(dvcname); /* open device */
newimage(NULL); /* start image */
for ( ; ; ) { /* quit in command() */
while (hresolu <= 1<<pdepth && vresolu <= 1<<pdepth)
command("done: ");
errno = 0;
if (hresolu <= psample<<pdepth && vresolu <= psample<<pdepth) {
sprintf(buf, "%d sampling...\n", 1<<pdepth);
(*dev->comout)(buf);
rsample();
} else {
sprintf(buf, "%d refining...\n", 1<<pdepth);
(*dev->comout)(buf);
refine(&ptrunk, pdepth+1);
}
if (dev->inpready) /* noticed some input */
command(": ");
else /* finished this depth */
pdepth++;
}
}
void
command( /* get/execute command */
char *prompt
)
{
#define badcom(s) strncmp(s, inpbuf, args-inpbuf-1)
char inpbuf[256];
char *args;
again:
(*dev->comin)(inpbuf, prompt); /* get command + arguments */
for (args = inpbuf; *args && *args != ' '; args++)
;
if (*args) *args++ = '\0';
else *++args = '\0';
if (waitrays() < 0) /* clear ray queue */
quit(1);
switch (inpbuf[0]) {
case 'f': /* new frame (|focus|free) */
if (badcom("frame")) {
if (badcom("focus")) {
if (badcom("free"))
goto commerr;
free_objmem();
break;
}
getfocus(args);
break;
}
getframe(args);
break;
case 'v': /* view */
if (badcom("view"))
goto commerr;
getview(args);
break;
case 'l': /* last view */
if (badcom("last"))
goto commerr;
lastview(args);
break;
case 'V': /* save view */
if (badcom("V"))
goto commerr;
saveview(args);
break;
case 'L': /* load view */
if (badcom("L"))
goto commerr;
loadview(args);
break;
case 'e': /* exposure */
if (badcom("exposure"))
goto commerr;
getexposure(args);
break;
case 's': /* set a parameter */
if (badcom("set")) {
#ifdef SIGTSTP
if (!badcom("stop"))
goto dostop;
#endif
goto commerr;
}
setparam(args);
break;
case 'n': /* new picture */
if (badcom("new"))
goto commerr;
newimage(args);
break;
case 't': /* trace a ray */
if (badcom("trace"))
goto commerr;
traceray(args);
break;
case 'a': /* aim camera */
if (badcom("aim"))
goto commerr;
getaim(args);
break;
case 'm': /* move camera (or memstats) */
if (badcom("move"))
goto commerr;
getmove(args);
break;
case 'r': /* rotate/repaint */
if (badcom("rotate")) {
if (badcom("repaint")) {
if (badcom("redraw"))
goto commerr;
redraw();
break;
}
getrepaint(args);
break;
}
getrotate(args);
break;
case 'p': /* pivot view */
if (badcom("pivot")) {
if (badcom("pause"))
goto commerr;
goto again;
}
getpivot(args);
break;
case 'o': /* origin view */
if (badcom("origin"))
goto commerr;
getorigin(args);
break;
case CTRL('R'): /* redraw */
redraw();
break;
case 'w': /* write */
if (badcom("write"))
goto commerr;
writepict(args);
break;
case 'q': /* quit */
if (badcom("quit"))
goto commerr;
quit(0);
case CTRL('C'): /* interrupt */
goto again;
#ifdef SIGTSTP
case CTRL('Z'):; /* stop */
dostop:
devclose();
kill(0, SIGTSTP);
/* pc stops here */
devopen(dvcname);
redraw();
break;
#endif
case '\0': /* continue */
break;
default:;
commerr:
if (iscntrl(inpbuf[0]))
sprintf(errmsg, "^%c: unknown control",
inpbuf[0]|0100);
else
sprintf(errmsg, "%s: unknown command", inpbuf);
error(COMMAND, errmsg);
break;
}
if (newparam && ray_pnprocs) /* drop into immediate mode */
ray_pclose(0);
#undef badcom
}
void
rsample(void) /* sample the image */
{
int xsiz, ysiz, y;
PNODE *p;
PNODE **pl;
int x;
/*
* We initialize the bottom row in the image at our current
* resolution. During sampling, we check super-pixels to the
* right and above by calling bigdiff(). If there is a significant
* difference, we subsample the super-pixels. The testing process
* includes initialization of the next row.
*/
xsiz = (((long)(pframe.r-pframe.l)<<pdepth)+hresolu-1) / hresolu;
ysiz = (((long)(pframe.u-pframe.d)<<pdepth)+vresolu-1) / vresolu;
pl = (PNODE **)malloc(xsiz*sizeof(PNODE *));
if (pl == NULL)
return;
/*
* Initialize the bottom row.
*/
pl[0] = findrect(pframe.l, pframe.d, &ptrunk, pdepth);
for (x = 1; x < xsiz; x++) {
pl[x] = findrect(pframe.l+((x*hresolu)>>pdepth),
pframe.d, &ptrunk, pdepth);
}
/* sample the image */
for (y = 0; /* y < ysiz */ ; y++) {
for (x = 0; x < xsiz-1; x++) {
if (dev->inpready)
goto escape;
/*
* Test super-pixel to the right.
*/
if (pl[x] != pl[x+1] && bigdiff(pl[x]->v,
pl[x+1]->v, maxdiff)) {
refine(pl[x], 1);
refine(pl[x+1], 1);
}
}
if (y >= ysiz-1)
break;
for (x = 0; x < xsiz; x++) {
if (dev->inpready)
goto escape;
/*
* Find super-pixel at this position in next row.
*/
p = findrect(pframe.l+((x*hresolu)>>pdepth),
pframe.d+(((y+1)*vresolu)>>pdepth),
&ptrunk, pdepth);
/*
* Test super-pixel in next row.
*/
if (pl[x] != p && bigdiff(pl[x]->v, p->v, maxdiff)) {
refine(pl[x], 1);
refine(p, 1);
}
/*
* Copy into super-pixel array.
*/
pl[x] = p;
}
}
escape:
free((void *)pl);
}
int
refine( /* refine a node */
PNODE *p,
int pd
)
{
int growth;
int mx, my;
if (dev->inpready) /* quit for input */
return(0);
if (pd <= 0) /* depth limit */
return(0);
mx = (p->xmin + p->xmax) >> 1;
my = (p->ymin + p->ymax) >> 1;
growth = 0;
if (p->kid == NULL) { /* subdivide */
if ((p->kid = newptree()) == NULL)
return(0);
p->kid[UR].xmin = mx;
p->kid[UR].ymin = my;
p->kid[UR].xmax = p->xmax;
p->kid[UR].ymax = p->ymax;
p->kid[UL].xmin = p->xmin;
p->kid[UL].ymin = my;
p->kid[UL].xmax = mx;
p->kid[UL].ymax = p->ymax;
p->kid[DR].xmin = mx;
p->kid[DR].ymin = p->ymin;
p->kid[DR].xmax = p->xmax;
p->kid[DR].ymax = my;
p->kid[DL].xmin = p->xmin;
p->kid[DL].ymin = p->ymin;
p->kid[DL].xmax = mx;
p->kid[DL].ymax = my;
/*
* The following paint order can leave a black pixel
* if redraw() is called in (*dev->paintr)().
*/
if (p->x >= mx && p->y >= my)
pcopy(p, p->kid+UR);
else if (paint(p->kid+UR) < 0)
quit(1);
if (p->x < mx && p->y >= my)
pcopy(p, p->kid+UL);
else if (paint(p->kid+UL) < 0)
quit(1);
if (p->x >= mx && p->y < my)
pcopy(p, p->kid+DR);
else if (paint(p->kid+DR) < 0)
quit(1);
if (p->x < mx && p->y < my)
pcopy(p, p->kid+DL);
else if (paint(p->kid+DL) < 0)
quit(1);
growth++;
}
/* do children */
if (mx > pframe.l) {
if (my > pframe.d)
growth += refine(p->kid+DL, pd-1);
if (my < pframe.u)
growth += refine(p->kid+UL, pd-1);
}
if (mx < pframe.r) {
if (my > pframe.d)
growth += refine(p->kid+DR, pd-1);
if (my < pframe.u)
growth += refine(p->kid+UR, pd-1);
}
return(growth);
}

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