src/rt/rview.c

#ifndef lint
static const char       RCSid[] = "$Id: rview.c,v 2.28 2005/06/13 20:07:56 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
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 (waitrays() < 0)
                        quit(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';
        
        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"))
#ifdef  MSTATS
                {
                        if (badcom("memory"))
                                goto commerr;
                        printmemstats(stderr);
                        break;
                }
#else
                        goto commerr;
#endif
                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 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;
        }
#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 || errno == ENOMEM)
                                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 || errno == ENOMEM)
                                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;
        int  i;

        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);
        }
                                                /* recompute sum */
        if (growth) {
                setcolor(p->v, 0.0, 0.0, 0.0);
                for (i = 0; i < 4; i++)
                        addcolor(p->v, p->kid[i].v);
                scalecolor(p->v, 0.25);
        }
        return(growth);
}
Revision:	2.29
Committed:	Thu Aug 21 07:05:59 2008 UTC (15 years, 8 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.28:	+64 -172 lines
Log Message:	Added -n option to rvu for multiple rendering processes
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.29	static const char RCSid[] = "$Id: rview.c,v 2.28 2005/06/13 20:07:56 greg Exp $";
3	greg	1.1	#endif
4			/*
5			* rview.c - routines and variables for interactive view generation.
6			*
7	greg	2.18	* External symbols declared in rpaint.h
8			*/
9
10	greg	2.19	#include "copyright.h"
11	greg	1.1
12	schorsch	2.20	#include <signal.h>
13			#include <ctype.h>
14
15	greg	1.15	#include "ray.h"
16	greg	1.1	#include "rpaint.h"
17
18	greg	2.8	#define CTRL(c) ((c)-'@')
19	greg	1.1
20
21	greg	2.18	void
22	greg	2.29	devopen( /* open device driver */
23			char *dname
24			)
25	greg	1.1	{
26	greg	1.6	extern char progname, octname;
27	greg	1.7	char *id;
28	greg	2.29	int i;
29	greg	1.6
30	greg	1.7	id = octname!=NULL ? octname : progname;
31	greg	1.1	/* check device table */
32			for (i = 0; devtable[i].name; i++)
33	schorsch	2.23	if (!strcmp(dname, devtable[i].name)) {
34	greg	1.7	if ((dev = (*devtable[i].init)(dname, id)) == NULL) {
35	greg	1.1	sprintf(errmsg, "cannot initialize %s", dname);
36			error(USER, errmsg);
37			} else
38			return;
39	schorsch	2.23	}
40	greg	1.1	/* not there, try exec */
41	greg	1.7	if ((dev = comm_init(dname, id)) == NULL) {
42	greg	1.1	sprintf(errmsg, "cannot start device \"%s\"", dname);
43			error(USER, errmsg);
44			}
45			}
46
47
48	greg	2.18	void
49	greg	2.29	devclose(void) /* close our device */
50	greg	1.1	{
51			if (dev != NULL)
52			(*dev->close)();
53			dev = NULL;
54			}
55
56
57	greg	2.18	void
58	greg	2.29	printdevices(void) /* print list of output devices */
59	greg	1.1	{
60	greg	2.29	int i;
61	greg	1.1
62			for (i = 0; devtable[i].name; i++)
63			printf("%-16s # %s\n", devtable[i].name, devtable[i].descrip);
64			}
65
66
67	greg	2.18	void
68	greg	2.29	rview(void) /* do a view */
69	greg	1.1	{
70			char buf[32];
71
72	greg	2.18	devopen(dvcname); /* open device */
73	greg	2.29	newimage(NULL); /* start image */
74	greg	1.14
75	greg	1.1	for ( ; ; ) { /* quit in command() */
76	greg	1.14	while (hresolu <= 1<<pdepth && vresolu <= 1<<pdepth)
77	greg	1.1	command("done: ");
78	greg	1.14	errno = 0;
79			if (hresolu <= psample<<pdepth && vresolu <= psample<<pdepth) {
80	greg	1.1	sprintf(buf, "%d sampling...\n", 1<<pdepth);
81			(*dev->comout)(buf);
82			rsample();
83			} else {
84			sprintf(buf, "%d refining...\n", 1<<pdepth);
85			(*dev->comout)(buf);
86	greg	2.29	refine(&ptrunk, pdepth+1);
87	greg	1.1	}
88	greg	2.29	if (waitrays() < 0)
89			quit(1);
90			if (dev->inpready) /* noticed some input */
91	greg	1.1	command(": ");
92	greg	1.14	else /* finished this depth */
93	greg	1.1	pdepth++;
94			}
95			}
96
97
98	greg	2.18	void
99	greg	2.29	command( /* get/execute command */
100			char *prompt
101			)
102	greg	1.1	{
103	greg	2.8	#define badcom(s) strncmp(s, inpbuf, args-inpbuf-1)
104	greg	1.1	char inpbuf[256];
105			char *args;
106			again:
107	greg	1.10	(dev->comin)(inpbuf, prompt); / get command + arguments */
108	greg	1.1	for (args = inpbuf; args && args != ' '; args++)
109			;
110			if (args) args++ = '\0';
111			else *++args = '\0';
112
113			switch (inpbuf[0]) {
114	greg	2.27	case 'f': /* new frame (\|focus\|free) */
115	greg	2.10	if (badcom("frame")) {
116	greg	2.27	if (badcom("focus")) {
117			if (badcom("free"))
118			goto commerr;
119			free_objmem();
120			break;
121			}
122			getfocus(args);
123	greg	2.10	break;
124			}
125	greg	1.1	getframe(args);
126			break;
127			case 'v': /* view */
128			if (badcom("view"))
129			goto commerr;
130			getview(args);
131			break;
132			case 'l': /* last view */
133			if (badcom("last"))
134			goto commerr;
135			lastview(args);
136	greg	2.11	break;
137			case 'V': /* save view */
138			if (badcom("V"))
139			goto commerr;
140			saveview(args);
141			break;
142			case 'L': /* load view */
143			if (badcom("L"))
144			goto commerr;
145			loadview(args);
146	greg	1.1	break;
147			case 'e': /* exposure */
148			if (badcom("exposure"))
149			goto commerr;
150			getexposure(args);
151			break;
152			case 's': /* set a parameter */
153	greg	2.13	if (badcom("set")) {
154			#ifdef SIGTSTP
155			if (!badcom("stop"))
156			goto dostop;
157			#endif
158	greg	1.1	goto commerr;
159	greg	2.13	}
160	greg	1.1	setparam(args);
161			break;
162			case 'n': /* new picture */
163			if (badcom("new"))
164			goto commerr;
165	greg	2.29	newimage(args);
166	greg	1.1	break;
167			case 't': /* trace a ray */
168			if (badcom("trace"))
169			goto commerr;
170			traceray(args);
171			break;
172			case 'a': /* aim camera */
173			if (badcom("aim"))
174			goto commerr;
175			getaim(args);
176			break;
177	greg	2.10	case 'm': /* move camera (or memstats) */
178	greg	1.1	if (badcom("move"))
179	greg	2.8	#ifdef MSTATS
180	greg	2.2	{
181			if (badcom("memory"))
182			goto commerr;
183			printmemstats(stderr);
184			break;
185			}
186			#else
187	greg	1.1	goto commerr;
188	greg	2.2	#endif
189	greg	1.1	getmove(args);
190			break;
191	greg	1.8	case 'r': /* rotate/repaint */
192			if (badcom("rotate")) {
193	greg	2.13	if (badcom("repaint")) {
194			if (badcom("redraw"))
195			goto commerr;
196			redraw();
197			break;
198			}
199	greg	1.8	getrepaint(args);
200			break;
201			}
202	greg	1.1	getrotate(args);
203			break;
204			case 'p': /* pivot view */
205	greg	2.13	if (badcom("pivot")) {
206			if (badcom("pause"))
207			goto commerr;
208			goto again;
209			}
210	greg	1.1	getpivot(args);
211			break;
212	greg	2.4	case CTRL('R'): /* redraw */
213	greg	1.1	redraw();
214			break;
215			case 'w': /* write */
216			if (badcom("write"))
217			goto commerr;
218			writepict(args);
219			break;
220			case 'q': /* quit */
221			if (badcom("quit"))
222			goto commerr;
223			quit(0);
224	greg	2.4	case CTRL('C'): /* interrupt */
225	greg	1.1	goto again;
226	greg	2.8	#ifdef SIGTSTP
227	greg	2.13	case CTRL('Z'):; /* stop */
228			dostop:
229	greg	1.1	devclose();
230			kill(0, SIGTSTP);
231			/* pc stops here */
232	greg	2.18	devopen(dvcname);
233	greg	1.1	redraw();
234			break;
235			#endif
236			case '\0': /* continue */
237			break;
238			default:;
239			commerr:
240			if (iscntrl(inpbuf[0]))
241			sprintf(errmsg, "^%c: unknown control",
242			inpbuf[0]\|0100);
243			else
244			sprintf(errmsg, "%s: unknown command", inpbuf);
245			error(COMMAND, errmsg);
246			break;
247			}
248	greg	2.8	#undef badcom
249	greg	1.1	}
250
251
252	greg	2.18	void
253	greg	2.29	rsample(void) /* sample the image */
254	greg	1.1	{
255			int xsiz, ysiz, y;
256			PNODE *p;
257	greg	2.29	PNODE **pl;
258			int x;
259	greg	1.1	/*
260			* We initialize the bottom row in the image at our current
261	greg	2.8	* resolution. During sampling, we check super-pixels to the
262	greg	1.1	* right and above by calling bigdiff(). If there is a significant
263			* difference, we subsample the super-pixels. The testing process
264			* includes initialization of the next row.
265			*/
266	greg	2.12	xsiz = (((long)(pframe.r-pframe.l)<<pdepth)+hresolu-1) / hresolu;
267			ysiz = (((long)(pframe.u-pframe.d)<<pdepth)+vresolu-1) / vresolu;
268	greg	1.1	pl = (PNODE *)malloc(xsizsizeof(PNODE *));
269	greg	2.29	if (pl == NULL)
270	greg	1.14	return;
271	greg	1.1	/*
272			* Initialize the bottom row.
273			*/
274	greg	2.29	pl[0] = findrect(pframe.l, pframe.d, &ptrunk, pdepth);
275	greg	1.1	for (x = 1; x < xsiz; x++) {
276	greg	1.9	pl[x] = findrect(pframe.l+((x*hresolu)>>pdepth),
277	greg	2.29	pframe.d, &ptrunk, pdepth);
278	greg	1.1	}
279			/* sample the image */
280			for (y = 0; /* y < ysiz */ ; y++) {
281			for (x = 0; x < xsiz-1; x++) {
282	greg	1.20	if (dev->inpready \|\| errno == ENOMEM)
283	greg	1.1	goto escape;
284			/*
285			* Test super-pixel to the right.
286			*/
287			if (pl[x] != pl[x+1] && bigdiff(pl[x]->v,
288			pl[x+1]->v, maxdiff)) {
289	greg	2.29	refine(pl[x], 1);
290			refine(pl[x+1], 1);
291	greg	1.1	}
292			}
293			if (y >= ysiz-1)
294			break;
295			for (x = 0; x < xsiz; x++) {
296	greg	1.20	if (dev->inpready \|\| errno == ENOMEM)
297	greg	1.1	goto escape;
298			/*
299			* Find super-pixel at this position in next row.
300			*/
301	greg	1.9	p = findrect(pframe.l+((x*hresolu)>>pdepth),
302			pframe.d+(((y+1)*vresolu)>>pdepth),
303	greg	2.29	&ptrunk, pdepth);
304	greg	1.1	/*
305			* Test super-pixel in next row.
306			*/
307			if (pl[x] != p && bigdiff(pl[x]->v, p->v, maxdiff)) {
308	greg	2.29	refine(pl[x], 1);
309			refine(p, 1);
310	greg	1.1	}
311			/*
312			* Copy into super-pixel array.
313			*/
314			pl[x] = p;
315			}
316			}
317			escape:
318	greg	2.18	free((void *)pl);
319	greg	1.1	}
320
321
322			int
323	greg	2.29	refine( /* refine a node */
324			PNODE *p,
325			int pd
326			)
327	greg	1.1	{
328			int growth;
329			int mx, my;
330			int i;
331
332			if (dev->inpready) /* quit for input */
333			return(0);
334
335			if (pd <= 0) /* depth limit */
336			return(0);
337
338	greg	2.29	mx = (p->xmin + p->xmax) >> 1;
339			my = (p->ymin + p->ymax) >> 1;
340	greg	1.1	growth = 0;
341
342			if (p->kid == NULL) { /* subdivide */
343
344			if ((p->kid = newptree()) == NULL)
345	greg	1.20	return(0);
346	greg	2.29
347			p->kid[UR].xmin = mx;
348			p->kid[UR].ymin = my;
349			p->kid[UR].xmax = p->xmax;
350			p->kid[UR].ymax = p->ymax;
351			p->kid[UL].xmin = p->xmin;
352			p->kid[UL].ymin = my;
353			p->kid[UL].xmax = mx;
354			p->kid[UL].ymax = p->ymax;
355			p->kid[DR].xmin = mx;
356			p->kid[DR].ymin = p->ymin;
357			p->kid[DR].xmax = p->xmax;
358			p->kid[DR].ymax = my;
359			p->kid[DL].xmin = p->xmin;
360			p->kid[DL].ymin = p->ymin;
361			p->kid[DL].xmax = mx;
362			p->kid[DL].ymax = my;
363	greg	1.1	/*
364			* The following paint order can leave a black pixel
365	greg	2.7	* if redraw() is called in (*dev->paintr)().
366	greg	1.1	*/
367			if (p->x >= mx && p->y >= my)
368			pcopy(p, p->kid+UR);
369	greg	2.29	else if (paint(p->kid+UR) < 0)
370			quit(1);
371	greg	1.1	if (p->x < mx && p->y >= my)
372			pcopy(p, p->kid+UL);
373	greg	2.29	else if (paint(p->kid+UL) < 0)
374			quit(1);
375	greg	1.1	if (p->x >= mx && p->y < my)
376			pcopy(p, p->kid+DR);
377	greg	2.29	else if (paint(p->kid+DR) < 0)
378			quit(1);
379	greg	1.1	if (p->x < mx && p->y < my)
380			pcopy(p, p->kid+DL);
381	greg	2.29	else if (paint(p->kid+DL) < 0)
382			quit(1);
383	greg	1.1
384			growth++;
385			}
386			/* do children */
387			if (mx > pframe.l) {
388			if (my > pframe.d)
389	greg	2.29	growth += refine(p->kid+DL, pd-1);
390	greg	1.1	if (my < pframe.u)
391	greg	2.29	growth += refine(p->kid+UL, pd-1);
392	greg	1.1	}
393			if (mx < pframe.r) {
394			if (my > pframe.d)
395	greg	2.29	growth += refine(p->kid+DR, pd-1);
396	greg	1.1	if (my < pframe.u)
397	greg	2.29	growth += refine(p->kid+UR, pd-1);
398	greg	1.1	}
399			/* recompute sum */
400			if (growth) {
401			setcolor(p->v, 0.0, 0.0, 0.0);
402			for (i = 0; i < 4; i++)
403			addcolor(p->v, p->kid[i].v);
404			scalecolor(p->v, 0.25);
405			}
406			return(growth);
407			}