1 |
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/* Copyright (c) 1991 Regents of the University of California */ |
2 |
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#ifndef lint |
2 |
< |
static char SCCSid[] = "$SunId$ LBL"; |
2 |
> |
static const char RCSid[] = "$Id$"; |
3 |
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#endif |
6 |
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|
4 |
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/* |
5 |
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* Gather samples and compute glare sources. |
6 |
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*/ |
7 |
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|
8 |
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#include "glare.h" |
9 |
+ |
#include "linregr.h" |
10 |
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|
11 |
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#define vcont(vd,vu) ((vu)-(vd)<=SEPS) |
12 |
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#define hcont(s1,s2) ((s1)->r-(s2)->l>=-SEPS&&(s2)->r-(s1)->l>=-SEPS) |
14 |
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struct source *curlist = NULL; /* current source list */ |
15 |
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struct source *donelist = NULL; /* finished sources */ |
16 |
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|
17 |
+ |
void pict_stats(void); |
18 |
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|
19 |
< |
struct srcspan * |
20 |
< |
newspan(l, r, v, sb) /* allocate a new source span */ |
21 |
< |
int l, r, v; |
22 |
< |
float *sb; |
19 |
> |
static struct srcspan * newspan(int l, int r, int v, float *sb); |
20 |
> |
static void addindirect(int h, int v, double br); |
21 |
> |
static void addsrcspan(struct srcspan *nss); |
22 |
> |
static void mergesource(struct source *sp, struct source *ap); |
23 |
> |
static void close_sources(int v); |
24 |
> |
static void close_allsrcs(void); |
25 |
> |
static struct srcspan * splitspan(struct srcspan *sso, double h, double v, double m); |
26 |
> |
static struct source * splitsource(struct source *so); |
27 |
> |
static void donesource(struct source *sp); |
28 |
> |
static struct source * findbuddy(struct source *s, struct source *l); |
29 |
> |
static void absorb(struct source *s); |
30 |
> |
static void freespans(struct source *sp); |
31 |
> |
|
32 |
> |
|
33 |
> |
static struct srcspan * |
34 |
> |
newspan( /* allocate a new source span */ |
35 |
> |
int l, |
36 |
> |
int r, |
37 |
> |
int v, |
38 |
> |
float *sb |
39 |
> |
) |
40 |
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{ |
41 |
< |
register struct srcspan *ss; |
42 |
< |
register int i; |
41 |
> |
struct srcspan *ss; |
42 |
> |
int i; |
43 |
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|
44 |
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ss = (struct srcspan *)malloc(sizeof(struct srcspan)); |
45 |
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if (ss == NULL) |
54 |
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} |
55 |
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|
56 |
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|
57 |
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analyze() /* analyze our scene */ |
57 |
> |
void |
58 |
> |
analyze(void) /* analyze our scene */ |
59 |
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{ |
60 |
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int h, v; |
61 |
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int left; |
67 |
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for (v = vsize; v >= -vsize; v--) { |
68 |
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close_sources(v); |
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#ifndef DEBUG |
70 |
< |
if (verbose) |
70 |
> |
if (verbose) { |
71 |
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fprintf(stderr, "%s: analyzing... %3ld%%\r", |
72 |
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progname, 100L*(vsize-v)/(2*vsize)); |
73 |
+ |
fflush(stderr); |
74 |
+ |
} |
75 |
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#endif |
76 |
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getviewspan(v, spanbr); |
77 |
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left = hsize + 1; |
91 |
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addsrcspan(newspan(left,h,v,spanbr)); |
92 |
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left = hsize + 1; |
93 |
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} |
94 |
< |
addindirect(h, spanbr[h+hsize]); |
94 |
> |
addindirect(h, v, spanbr[h+hsize]); |
95 |
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} |
96 |
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} |
97 |
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if (left < h) |
98 |
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addsrcspan(newspan(left,h,v,spanbr)); |
99 |
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} |
100 |
< |
free((char *)spanbr); |
100 |
> |
free((void *)spanbr); |
101 |
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close_allsrcs(); |
83 |
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absorb_specks(); |
102 |
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} |
103 |
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|
104 |
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|
105 |
< |
addindirect(h, br) /* add brightness to indirect illuminances */ |
106 |
< |
int h; |
107 |
< |
double br; |
105 |
> |
static void |
106 |
> |
addindirect( /* add brightness to indirect illuminances */ |
107 |
> |
int h, |
108 |
> |
int v, |
109 |
> |
double br |
110 |
> |
) |
111 |
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{ |
112 |
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double tanb, d; |
113 |
< |
register int i; |
113 |
> |
int hl; |
114 |
> |
int i; |
115 |
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|
116 |
< |
if (h <= -hlim) { /* left region */ |
117 |
< |
d = (double)(-h-hlim)/sampdens; |
116 |
> |
hl = hlim(v); |
117 |
> |
if (h <= -hl) { /* left region */ |
118 |
> |
d = (double)(-h-hl)/sampdens; |
119 |
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if (d >= 1.0-FTINY) |
120 |
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return; |
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tanb = d/sqrt(1.0-d*d); |
123 |
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d = indirect[i].lcos - tanb*indirect[i].lsin; |
124 |
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if (d > 0.0) { |
125 |
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indirect[i].sum += d * br; |
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< |
indirect[i].n++; |
126 |
> |
indirect[i].n += d; |
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} |
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} |
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return; |
130 |
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} |
131 |
< |
if (h >= hlim) { /* right region */ |
132 |
< |
d = (double)(-h+hlim)/sampdens; |
131 |
> |
if (h >= hl) { /* right region */ |
132 |
> |
d = (double)(-h+hl)/sampdens; |
133 |
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if (d <= -1.0+FTINY) |
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return; |
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tanb = d/sqrt(1.0-d*d); |
137 |
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d = indirect[i].rcos - tanb*indirect[i].rsin; |
138 |
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if (d > 0.0) { |
139 |
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indirect[i].sum += d * br; |
140 |
< |
indirect[i].n++; |
140 |
> |
indirect[i].n += d; |
141 |
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} |
142 |
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} |
143 |
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return; |
144 |
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} |
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/* central region */ |
146 |
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for (i = 0; i < nglardirs; i++) { |
147 |
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d = cos(h_theta(h) - indirect[i].theta); |
147 |
> |
d = cos(h_theta(h,v) - indirect[i].theta); |
148 |
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if (d > 0.0) { |
149 |
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indirect[i].sum += d * br; |
150 |
< |
indirect[i].n++; |
150 |
> |
indirect[i].n += d; |
151 |
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} |
152 |
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} |
153 |
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} |
154 |
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|
155 |
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|
156 |
< |
comp_thresh() /* compute glare threshold */ |
156 |
> |
void |
157 |
> |
comp_thresh(void) /* compute glare threshold */ |
158 |
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{ |
159 |
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int h, v; |
160 |
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int nsamps; |
165 |
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progname); |
166 |
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brsum = 0.0; |
167 |
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nsamps = 0; |
168 |
< |
for (v = vsize; v >= -vsize; v -= TSAMPSTEP) |
168 |
> |
for (v = vsize; v >= -vsize; v -= TSAMPSTEP) { |
169 |
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for (h = -hsize; h <= hsize; h += TSAMPSTEP) { |
170 |
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if ((br = getviewpix(h, v)) < 0.0) |
171 |
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continue; |
172 |
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brsum += br; |
173 |
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nsamps++; |
174 |
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} |
175 |
+ |
} |
176 |
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if (nsamps == 0) { |
177 |
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fprintf(stderr, "%s: no viewable scene!\n", progname); |
178 |
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exit(1); |
193 |
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} |
194 |
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|
195 |
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|
196 |
< |
addsrcspan(nss) /* add new source span to our list */ |
197 |
< |
struct srcspan *nss; |
196 |
> |
static void |
197 |
> |
addsrcspan( /* add new source span to our list */ |
198 |
> |
struct srcspan *nss |
199 |
> |
) |
200 |
|
{ |
201 |
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struct source *last, *cs, *this; |
202 |
< |
register struct srcspan *ss; |
202 |
> |
struct srcspan *ss; |
203 |
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|
204 |
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cs = NULL; |
205 |
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for (this = curlist; this != NULL; this = this->next) { |
233 |
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} |
234 |
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|
235 |
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|
236 |
< |
mergesource(sp, ap) /* merge source ap into source sp */ |
237 |
< |
struct source *sp, *ap; |
236 |
> |
static void |
237 |
> |
mergesource( /* merge source ap into source sp */ |
238 |
> |
struct source *sp, |
239 |
> |
struct source *ap |
240 |
> |
) |
241 |
|
{ |
242 |
|
struct srcspan head; |
243 |
< |
register struct srcspan *alp, *prev, *tp; |
243 |
> |
struct srcspan *alp, *prev, *tp; |
244 |
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|
245 |
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head.next = sp->first; |
246 |
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prev = &head; |
266 |
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sp->brt = (sp->brt*sp->dom + ap->brt*ap->dom) |
267 |
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/ (sp->dom + ap->dom); |
268 |
|
} |
269 |
< |
free((char *)ap); |
269 |
> |
free((void *)ap); |
270 |
|
} |
271 |
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|
272 |
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|
273 |
< |
close_sources(v) /* close sources above v */ |
274 |
< |
int v; |
273 |
> |
static void |
274 |
> |
close_sources( /* close sources above v */ |
275 |
> |
int v |
276 |
> |
) |
277 |
|
{ |
278 |
|
struct source head; |
279 |
< |
register struct source *last, *this; |
279 |
> |
struct source *last, *this; |
280 |
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|
281 |
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head.next = curlist; |
282 |
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last = &head; |
291 |
|
} |
292 |
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|
293 |
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|
294 |
< |
close_allsrcs() /* done with everything */ |
294 |
> |
static void |
295 |
> |
close_allsrcs(void) /* done with everything */ |
296 |
|
{ |
297 |
< |
register struct source *this, *next; |
297 |
> |
struct source *this, *next; |
298 |
|
|
299 |
|
this = curlist; |
300 |
|
while (this != NULL) { |
306 |
|
} |
307 |
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|
308 |
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|
309 |
< |
donesource(sp) /* finished with this source */ |
310 |
< |
register struct source *sp; |
309 |
> |
static struct srcspan * |
310 |
> |
splitspan( /* divide source span at point */ |
311 |
> |
struct srcspan *sso, |
312 |
> |
double h, |
313 |
> |
double v, |
314 |
> |
double m |
315 |
> |
) |
316 |
|
{ |
317 |
< |
FVECT dthis, dright; |
280 |
< |
register struct srcspan *ss; |
281 |
< |
int h, n; |
317 |
> |
struct srcspan *ssn; |
318 |
|
double d; |
319 |
+ |
int hs; |
320 |
|
|
321 |
+ |
d = h - m*(sso->v - v); |
322 |
+ |
hs = d < 0. ? d-.5 : d+.5; |
323 |
+ |
if (sso->l >= hs) |
324 |
+ |
return(NULL); |
325 |
+ |
if (sso->r <= hs) |
326 |
+ |
return(sso); |
327 |
+ |
/* need to split it */ |
328 |
+ |
ssn = (struct srcspan *)malloc(sizeof(struct srcspan)); |
329 |
+ |
if (ssn == NULL) |
330 |
+ |
memerr("source spans in splitspan"); |
331 |
+ |
ssn->brsum = (double)(hs - sso->l)/(sso->r - sso->l) * sso->brsum; |
332 |
+ |
sso->brsum -= ssn->brsum; |
333 |
+ |
ssn->v = sso->v; |
334 |
+ |
ssn->l = sso->l; |
335 |
+ |
ssn->r = sso->l = hs; |
336 |
+ |
return(ssn); |
337 |
+ |
} |
338 |
+ |
|
339 |
+ |
|
340 |
+ |
static struct source * |
341 |
+ |
splitsource( /* divide source in two if it's big and long */ |
342 |
+ |
struct source *so |
343 |
+ |
) |
344 |
+ |
{ |
345 |
+ |
LRSUM lr; |
346 |
+ |
LRLIN fit; |
347 |
+ |
struct srcspan *ss, *ssn; |
348 |
+ |
struct srcspan *ssl, *ssnl, head; |
349 |
+ |
int h; |
350 |
+ |
double mh, mv; |
351 |
+ |
struct source *sn; |
352 |
+ |
|
353 |
+ |
lrclear(&lr); |
354 |
+ |
for (ss = so->first; ss != NULL; ss = ss->next) |
355 |
+ |
for (h = ss->l; h < ss->r; h++) |
356 |
+ |
lrpoint(h, ss->v, &lr); |
357 |
+ |
if ((double)lr.n/(sampdens*sampdens) < SABIG) |
358 |
+ |
return(NULL); /* too small */ |
359 |
+ |
if (lrfit(&fit, &lr) < 0) |
360 |
+ |
return(NULL); /* can't fit a line */ |
361 |
+ |
if (fit.correlation < LCORR && fit.correlation > -LCORR) |
362 |
+ |
return(NULL); |
363 |
+ |
if (verbose) |
364 |
+ |
fprintf(stderr, "%s: splitting large source\n", progname); |
365 |
+ |
mh = lrxavg(&lr); |
366 |
+ |
mv = lryavg(&lr); |
367 |
+ |
sn = (struct source *)malloc(sizeof(struct source)); |
368 |
+ |
if (sn == NULL) |
369 |
+ |
memerr("source records in splitsource"); |
370 |
+ |
sn->dom = 0.0; |
371 |
+ |
sn->first = NULL; |
372 |
+ |
ssnl = NULL; |
373 |
+ |
head.next = so->first; |
374 |
+ |
ssl = &head; |
375 |
+ |
for (ss = so->first; ss != NULL; ssl = ss, ss = ss->next) |
376 |
+ |
if ((ssn = splitspan(ss, mh, mv, fit.slope)) != NULL) { |
377 |
+ |
if (ssn == ss) { /* remove from old */ |
378 |
+ |
ssl->next = ss->next; |
379 |
+ |
ss = ssl; |
380 |
+ |
} |
381 |
+ |
if (ssnl == NULL) /* add to new */ |
382 |
+ |
sn->first = ssn; |
383 |
+ |
else |
384 |
+ |
ssnl->next = ssn; |
385 |
+ |
ssn->next = NULL; |
386 |
+ |
ssnl = ssn; |
387 |
+ |
} |
388 |
+ |
so->first = head.next; |
389 |
+ |
return(sn); |
390 |
+ |
} |
391 |
+ |
|
392 |
+ |
|
393 |
+ |
static void |
394 |
+ |
donesource( /* finished with this source */ |
395 |
+ |
struct source *sp |
396 |
+ |
) |
397 |
+ |
{ |
398 |
+ |
struct source *newsrc; |
399 |
+ |
struct srcspan *ss; |
400 |
+ |
int h, n; |
401 |
+ |
double hsum, vsum, d; |
402 |
+ |
|
403 |
+ |
while ((newsrc = splitsource(sp)) != NULL) /* split it? */ |
404 |
+ |
donesource(newsrc); |
405 |
|
sp->dom = 0.0; |
406 |
< |
sp->dir[0] = sp->dir[1] = sp->dir[2] = 0.0; |
406 |
> |
hsum = vsum = 0.0; |
407 |
|
sp->brt = 0.0; |
408 |
|
n = 0; |
409 |
|
for (ss = sp->first; ss != NULL; ss = ss->next) { |
410 |
|
sp->brt += ss->brsum; |
411 |
|
n += ss->r - ss->l; |
412 |
< |
if (compdir(dright, ss->r, ss->v) < 0) |
413 |
< |
compdir(dright, ss->r-2, ss->v); |
414 |
< |
for (h = ss->r-1; h >= ss->l; h--) |
415 |
< |
if (compdir(dthis, h, ss->v) == 0) { |
416 |
< |
d = dist2(dthis, dright); |
417 |
< |
fvsum(sp->dir, sp->dir, dthis, d); |
297 |
< |
sp->dom += d; |
298 |
< |
VCOPY(dright, dthis); |
299 |
< |
} |
300 |
< |
free((char *)ss); |
412 |
> |
for (h = ss->l; h < ss->r; h++) { |
413 |
> |
d = pixsize(h, ss->v); |
414 |
> |
hsum += d*h; |
415 |
> |
vsum += d*ss->v; |
416 |
> |
sp->dom += d; |
417 |
> |
} |
418 |
|
} |
419 |
< |
sp->first = NULL; |
419 |
> |
freespans(sp); |
420 |
> |
if (sp->dom <= FTINY) { /* must be right at edge of image */ |
421 |
> |
free((void *)sp); |
422 |
> |
return; |
423 |
> |
} |
424 |
|
sp->brt /= (double)n; |
425 |
< |
normalize(sp->dir); |
425 |
> |
compdir(sp->dir, (int)(hsum/sp->dom), (int)(vsum/sp->dom)); |
426 |
|
sp->next = donelist; |
427 |
|
donelist = sp; |
428 |
|
if (verbose) |
429 |
|
fprintf(stderr, |
430 |
< |
"%s: found source at (%.3f,%.3f,%.3f), dw %.5f, br %.1f (%d samps)\n", |
430 |
> |
"%s: source at [%.3f,%.3f,%.3f], dw %.5f, br %.1f (%d samps)\n", |
431 |
|
progname, sp->dir[0], sp->dir[1], sp->dir[2], |
432 |
|
sp->dom, sp->brt, n); |
433 |
|
} |
434 |
|
|
435 |
|
|
436 |
< |
struct source * |
437 |
< |
findbuddy(s, l) /* find close enough source to s in l*/ |
438 |
< |
register struct source *s, *l; |
436 |
> |
static struct source * |
437 |
> |
findbuddy( /* find close enough source to s in l*/ |
438 |
> |
struct source *s, |
439 |
> |
struct source *l |
440 |
> |
) |
441 |
|
{ |
442 |
|
struct source *bestbuddy = NULL; |
443 |
|
double d, r, mindist = MAXBUDDY; |
454 |
|
} |
455 |
|
|
456 |
|
|
457 |
< |
absorb_specks() /* eliminate too-small sources */ |
457 |
> |
void |
458 |
> |
absorb_specks(void) /* eliminate too-small sources */ |
459 |
|
{ |
460 |
|
struct source head, *buddy; |
461 |
< |
register struct source *last, *this; |
461 |
> |
struct source *last, *this; |
462 |
|
|
463 |
|
if (verbose) |
464 |
|
fprintf(stderr, "%s: absorbing small sources...\n", progname); |
465 |
|
head.next = donelist; |
466 |
|
last = &head; |
467 |
< |
for (this = donelist; this != NULL; this = this->next) |
467 |
> |
for (this = head.next; this != NULL; this = this->next) |
468 |
|
if (TOOSMALL(this)) { |
469 |
|
last->next = this->next; |
470 |
< |
buddy = findbuddy(this, donelist); |
470 |
> |
buddy = findbuddy(this, head.next); |
471 |
|
if (buddy != NULL) |
472 |
|
mergesource(buddy, this); |
473 |
|
else |
479 |
|
} |
480 |
|
|
481 |
|
|
482 |
< |
absorb(s) /* absorb a source into indirect */ |
483 |
< |
register struct source *s; |
482 |
> |
static void |
483 |
> |
absorb( /* absorb a source into indirect */ |
484 |
> |
struct source *s |
485 |
> |
) |
486 |
|
{ |
487 |
|
FVECT dir; |
488 |
< |
register int i, n; |
488 |
> |
double d; |
489 |
> |
int i; |
490 |
|
|
491 |
|
for (i = 0; i < nglardirs; i++) { |
492 |
|
spinvector(dir, ourview.vdir, ourview.vup, indirect[i].theta); |
493 |
< |
n = DOT(dir,s->dir)*s->dom*(sampdens*sampdens) + 0.5; |
494 |
< |
if (n == 0) |
493 |
> |
d = DOT(dir,s->dir)*s->dom*(sampdens*sampdens); |
494 |
> |
if (d <= 0.0) |
495 |
|
continue; |
496 |
< |
indirect[i].sum += n * s->brt; |
497 |
< |
indirect[i].n += n; |
496 |
> |
indirect[i].sum += d * s->brt; |
497 |
> |
indirect[i].n += d; |
498 |
|
} |
499 |
< |
for ( ; s->first != NULL; s->first = s->first->next) |
500 |
< |
free((char *)s->first); |
501 |
< |
free((char *)s); |
499 |
> |
freespans(s); |
500 |
> |
free((void *)s); |
501 |
> |
} |
502 |
> |
|
503 |
> |
|
504 |
> |
static void |
505 |
> |
freespans( /* free spans associated with source */ |
506 |
> |
struct source *sp |
507 |
> |
) |
508 |
> |
{ |
509 |
> |
struct srcspan *ss; |
510 |
> |
|
511 |
> |
while ((ss = sp->first) != NULL) { |
512 |
> |
sp->first = ss->next; |
513 |
> |
free((void *)ss); |
514 |
> |
} |
515 |
|
} |