1 |
greg |
1.1 |
#ifndef lint |
2 |
schorsch |
2.9 |
static const char RCSid[] = "$Id: glareval.c,v 2.8 2003/06/27 06:53:23 greg Exp $"; |
3 |
greg |
1.1 |
#endif |
4 |
|
|
/* |
5 |
|
|
* Compute pixels for glare calculation |
6 |
|
|
*/ |
7 |
|
|
|
8 |
schorsch |
2.9 |
#include "copyright.h" |
9 |
|
|
|
10 |
|
|
#include <string.h> |
11 |
|
|
|
12 |
schorsch |
2.7 |
#include "rtprocess.h" /* Windows: must come first because of conflicts */ |
13 |
greg |
1.1 |
#include "glare.h" |
14 |
schorsch |
2.7 |
|
15 |
greg |
1.19 |
/* maximum rtrace buffer size */ |
16 |
|
|
#define MAXPIX (4096/(6*sizeof(float))) |
17 |
greg |
1.1 |
|
18 |
greg |
1.16 |
#define MAXSBUF 786432 /* maximum total size of scanline buffer */ |
19 |
greg |
1.9 |
#define HSIZE 317 /* size of scanline hash table */ |
20 |
greg |
1.8 |
#define NRETIRE 16 /* number of scanlines to retire at once */ |
21 |
greg |
1.1 |
|
22 |
schorsch |
2.7 |
static SUBPROC rt_pd = SP_INACTIVE; /* process id & descriptors for rtrace */ |
23 |
greg |
1.1 |
|
24 |
|
|
FILE *pictfp = NULL; /* picture file pointer */ |
25 |
|
|
double exposure; /* picture exposure */ |
26 |
|
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int pxsiz, pysiz; /* picture dimensions */ |
27 |
greg |
1.8 |
|
28 |
|
|
static int curpos; /* current scanline */ |
29 |
|
|
static long *scanpos; /* scanline positions */ |
30 |
|
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|
31 |
|
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typedef struct scan { |
32 |
|
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int y; /* scanline position */ |
33 |
greg |
1.1 |
long lused; /* for LRU replacement */ |
34 |
greg |
1.8 |
struct scan *next; /* next in this hash or free list */ |
35 |
|
|
/* followed by the scanline data */ |
36 |
|
|
} SCAN; /* buffered scanline */ |
37 |
greg |
1.1 |
|
38 |
greg |
1.8 |
#define scandata(sl) ((COLR *)((sl)+1)) |
39 |
|
|
#define shash(y) ((y)%HSIZE) |
40 |
|
|
|
41 |
greg |
1.19 |
static int maxpix; /* maximum number of pixels to buffer */ |
42 |
|
|
|
43 |
greg |
1.8 |
static SCAN *freelist; /* scanline free list */ |
44 |
|
|
static SCAN *hashtab[HSIZE]; /* scanline hash table */ |
45 |
|
|
|
46 |
greg |
2.2 |
static long scanbufsiz; /* size of allocated scanline buffer */ |
47 |
|
|
|
48 |
greg |
1.2 |
static long ncall = 0L; /* number of calls to getpictscan */ |
49 |
|
|
static long nread = 0L; /* number of scanlines read */ |
50 |
greg |
1.15 |
static long nrecl = 0L; /* number of scanlines reclaimed */ |
51 |
greg |
1.1 |
|
52 |
greg |
1.13 |
static int wrongformat = 0; |
53 |
|
|
|
54 |
greg |
1.8 |
SCAN *scanretire(); |
55 |
|
|
|
56 |
greg |
1.5 |
extern long ftell(); |
57 |
greg |
1.2 |
|
58 |
greg |
1.5 |
|
59 |
greg |
1.8 |
SCAN * |
60 |
|
|
claimscan(y) /* claim scanline from buffers */ |
61 |
|
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int y; |
62 |
|
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{ |
63 |
|
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int hi = shash(y); |
64 |
|
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SCAN *slast; |
65 |
|
|
register SCAN *sl; |
66 |
|
|
|
67 |
|
|
for (sl = hashtab[hi]; sl != NULL; sl = sl->next) |
68 |
|
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if (sl->y == y) /* active scanline */ |
69 |
|
|
return(sl); |
70 |
|
|
for (slast = NULL, sl = freelist; sl != NULL; slast = sl, sl = sl->next) |
71 |
|
|
if (sl->y == -1 || sl->y == y || sl->next == NULL) { |
72 |
|
|
if (slast == NULL) /* remove from free */ |
73 |
|
|
freelist = sl->next; |
74 |
|
|
else |
75 |
|
|
slast->next = sl->next; |
76 |
|
|
if (sl->y == y) { /* reclaim */ |
77 |
|
|
sl->next = hashtab[hi]; |
78 |
|
|
hashtab[hi] = sl; |
79 |
greg |
1.15 |
nrecl++; |
80 |
greg |
1.8 |
} |
81 |
|
|
return(sl); |
82 |
|
|
} |
83 |
|
|
return(scanretire()); /* need more free scanlines */ |
84 |
|
|
} |
85 |
|
|
|
86 |
|
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|
87 |
greg |
1.1 |
COLR * |
88 |
|
|
getpictscan(y) /* get picture scanline */ |
89 |
|
|
int y; |
90 |
|
|
{ |
91 |
greg |
1.8 |
register SCAN *sl; |
92 |
greg |
1.1 |
register int i; |
93 |
|
|
/* first check our buffers */ |
94 |
greg |
1.8 |
sl = claimscan(y); |
95 |
|
|
if (sl == NULL) |
96 |
|
|
memerr("claimscan()"); |
97 |
|
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sl->lused = ncall++; |
98 |
|
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if (sl->y == y) /* scan hit */ |
99 |
|
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return(scandata(sl)); |
100 |
|
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/* else read in replacement */ |
101 |
greg |
1.5 |
if (scanpos[y] < 0) { /* need to search */ |
102 |
|
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for (i = y+1; i < curpos; i++) |
103 |
|
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if (scanpos[i] >= 0) { |
104 |
|
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if (fseek(pictfp, scanpos[i], 0) < 0) |
105 |
|
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goto seekerr; |
106 |
|
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curpos = i; |
107 |
|
|
break; |
108 |
|
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} |
109 |
|
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while (curpos >= y) { |
110 |
greg |
1.1 |
scanpos[curpos] = ftell(pictfp); |
111 |
greg |
1.8 |
if (freadcolrs(scandata(sl), pxsiz, pictfp) < 0) |
112 |
greg |
1.1 |
goto readerr; |
113 |
greg |
1.5 |
nread++; |
114 |
greg |
1.1 |
curpos--; |
115 |
|
|
} |
116 |
greg |
1.5 |
} else { |
117 |
|
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if (curpos != y && fseek(pictfp, scanpos[y], 0) < 0) |
118 |
|
|
goto seekerr; |
119 |
greg |
1.8 |
if (freadcolrs(scandata(sl), pxsiz, pictfp) < 0) |
120 |
greg |
1.5 |
goto readerr; |
121 |
|
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nread++; |
122 |
|
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curpos = y-1; |
123 |
greg |
1.1 |
} |
124 |
greg |
1.8 |
sl->y = y; |
125 |
|
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i = shash(y); /* add to hash list */ |
126 |
|
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sl->next = hashtab[i]; |
127 |
|
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hashtab[i] = sl; |
128 |
|
|
return(scandata(sl)); |
129 |
greg |
1.1 |
readerr: |
130 |
|
|
fprintf(stderr, "%s: picture read error\n", progname); |
131 |
|
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exit(1); |
132 |
greg |
1.5 |
seekerr: |
133 |
|
|
fprintf(stderr, "%s: picture seek error\n", progname); |
134 |
|
|
exit(1); |
135 |
greg |
1.1 |
} |
136 |
|
|
|
137 |
|
|
|
138 |
greg |
1.6 |
#ifdef DEBUG |
139 |
greg |
1.2 |
pict_stats() /* print out picture read statistics */ |
140 |
|
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{ |
141 |
|
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static long lastcall = 0L; /* ncall at last report */ |
142 |
|
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static long lastread = 0L; /* nread at last report */ |
143 |
greg |
1.15 |
static long lastrecl = 0L; /* nrecl at last report */ |
144 |
greg |
1.2 |
|
145 |
|
|
if (ncall == lastcall) |
146 |
|
|
return; |
147 |
greg |
1.15 |
fprintf(stderr, "%s: %ld scanlines read (%ld reclaimed) in %ld calls\n", |
148 |
|
|
progname, nread-lastread, nrecl-lastrecl, ncall-lastcall); |
149 |
greg |
1.2 |
lastcall = ncall; |
150 |
|
|
lastread = nread; |
151 |
greg |
1.15 |
lastrecl = nrecl; |
152 |
greg |
1.2 |
} |
153 |
greg |
1.6 |
#endif |
154 |
greg |
1.2 |
|
155 |
|
|
|
156 |
greg |
1.1 |
double |
157 |
|
|
pict_val(vd) /* find picture value for view direction */ |
158 |
|
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FVECT vd; |
159 |
|
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{ |
160 |
|
|
FVECT pp; |
161 |
greg |
1.21 |
FVECT ip; |
162 |
greg |
1.1 |
COLOR res; |
163 |
|
|
|
164 |
|
|
if (pictfp == NULL) |
165 |
|
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return(-1.0); |
166 |
|
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pp[0] = pictview.vp[0] + vd[0]; |
167 |
|
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pp[1] = pictview.vp[1] + vd[1]; |
168 |
|
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pp[2] = pictview.vp[2] + vd[2]; |
169 |
greg |
1.21 |
viewloc(ip, &pictview, pp); |
170 |
|
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if (ip[2] <= FTINY || ip[0] < 0. || ip[0] >= 1. || |
171 |
|
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ip[1] < 0. || ip[1] >= 1.) |
172 |
greg |
1.1 |
return(-1.0); |
173 |
greg |
1.21 |
colr_color(res, getpictscan((int)(ip[1]*pysiz))[(int)(ip[0]*pxsiz)]); |
174 |
greg |
1.1 |
return(luminance(res)/exposure); |
175 |
|
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} |
176 |
|
|
|
177 |
|
|
|
178 |
|
|
double |
179 |
greg |
1.14 |
getviewpix(vh, vv) /* compute single view pixel */ |
180 |
greg |
1.1 |
int vh, vv; |
181 |
|
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{ |
182 |
|
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FVECT dir; |
183 |
greg |
1.19 |
float rt_buf[12]; |
184 |
greg |
1.1 |
double res; |
185 |
|
|
|
186 |
greg |
1.14 |
if (compdir(dir, vh, vv) < 0) |
187 |
greg |
1.1 |
return(-1.0); |
188 |
greg |
1.7 |
npixinvw++; |
189 |
greg |
1.1 |
if ((res = pict_val(dir)) >= 0.0) |
190 |
|
|
return(res); |
191 |
schorsch |
2.7 |
if (rt_pd.r == -1) { |
192 |
greg |
1.7 |
npixmiss++; |
193 |
greg |
1.1 |
return(-1.0); |
194 |
greg |
1.7 |
} |
195 |
greg |
1.1 |
rt_buf[0] = ourview.vp[0]; |
196 |
|
|
rt_buf[1] = ourview.vp[1]; |
197 |
|
|
rt_buf[2] = ourview.vp[2]; |
198 |
|
|
rt_buf[3] = dir[0]; |
199 |
|
|
rt_buf[4] = dir[1]; |
200 |
|
|
rt_buf[5] = dir[2]; |
201 |
|
|
rt_compute(rt_buf, 1); |
202 |
|
|
return(luminance(rt_buf)); |
203 |
|
|
} |
204 |
|
|
|
205 |
|
|
|
206 |
|
|
getviewspan(vv, vb) /* compute a span of view pixels */ |
207 |
|
|
int vv; |
208 |
|
|
float *vb; |
209 |
|
|
{ |
210 |
|
|
float rt_buf[6*MAXPIX]; /* rtrace send/receive buffer */ |
211 |
greg |
1.3 |
register int n; /* number of pixels in buffer */ |
212 |
greg |
1.1 |
short buf_vh[MAXPIX]; /* pixel positions */ |
213 |
|
|
FVECT dir; |
214 |
|
|
register int vh; |
215 |
|
|
|
216 |
greg |
1.4 |
#ifdef DEBUG |
217 |
greg |
1.1 |
if (verbose) |
218 |
|
|
fprintf(stderr, "%s: computing view span at %d...\n", |
219 |
|
|
progname, vv); |
220 |
greg |
1.4 |
#endif |
221 |
greg |
1.3 |
n = 0; |
222 |
greg |
1.1 |
for (vh = -hsize; vh <= hsize; vh++) { |
223 |
greg |
1.14 |
if (compdir(dir, vh, vv) < 0) { /* not in view */ |
224 |
greg |
1.1 |
vb[vh+hsize] = -1.0; |
225 |
|
|
continue; |
226 |
|
|
} |
227 |
greg |
1.7 |
npixinvw++; |
228 |
greg |
1.1 |
if ((vb[vh+hsize] = pict_val(dir)) >= 0.0) |
229 |
|
|
continue; |
230 |
schorsch |
2.7 |
if (rt_pd.r == -1) { /* missing information */ |
231 |
greg |
1.7 |
npixmiss++; |
232 |
greg |
1.1 |
continue; |
233 |
greg |
1.7 |
} |
234 |
greg |
1.1 |
/* send to rtrace */ |
235 |
greg |
1.19 |
if (n >= maxpix) { /* flush */ |
236 |
greg |
1.3 |
rt_compute(rt_buf, n); |
237 |
|
|
while (n-- > 0) |
238 |
|
|
vb[buf_vh[n]+hsize] = luminance(rt_buf+3*n); |
239 |
greg |
1.1 |
} |
240 |
greg |
1.3 |
rt_buf[6*n] = ourview.vp[0]; |
241 |
|
|
rt_buf[6*n+1] = ourview.vp[1]; |
242 |
|
|
rt_buf[6*n+2] = ourview.vp[2]; |
243 |
|
|
rt_buf[6*n+3] = dir[0]; |
244 |
|
|
rt_buf[6*n+4] = dir[1]; |
245 |
|
|
rt_buf[6*n+5] = dir[2]; |
246 |
|
|
buf_vh[n++] = vh; |
247 |
greg |
1.1 |
} |
248 |
greg |
1.4 |
#ifdef DEBUG |
249 |
greg |
1.2 |
if (verbose) |
250 |
|
|
pict_stats(); |
251 |
greg |
1.4 |
#endif |
252 |
greg |
1.3 |
if (n > 0) { /* process pending buffer */ |
253 |
|
|
rt_compute(rt_buf, n); |
254 |
|
|
while (n-- > 0) |
255 |
|
|
vb[buf_vh[n]+hsize] = luminance(rt_buf+3*n); |
256 |
|
|
} |
257 |
greg |
1.1 |
} |
258 |
|
|
|
259 |
|
|
|
260 |
|
|
rt_compute(pb, np) /* process buffer through rtrace */ |
261 |
|
|
float *pb; |
262 |
|
|
int np; |
263 |
|
|
{ |
264 |
greg |
1.4 |
#ifdef DEBUG |
265 |
greg |
1.1 |
if (verbose && np > 1) |
266 |
|
|
fprintf(stderr, "%s: sending %d samples to rtrace...\n", |
267 |
|
|
progname, np); |
268 |
greg |
1.4 |
#endif |
269 |
schorsch |
2.9 |
memset(pb+6*np, '\0', 6*sizeof(float)); |
270 |
schorsch |
2.7 |
if (process(&rt_pd, (char *)pb, (char *)pb, 3*sizeof(float)*(np+1), |
271 |
gregl |
2.4 |
6*sizeof(float)*(np+1)) < 3*sizeof(float)*(np+1)) { |
272 |
greg |
1.19 |
fprintf(stderr, "%s: rtrace communication error\n", |
273 |
greg |
1.1 |
progname); |
274 |
|
|
exit(1); |
275 |
|
|
} |
276 |
|
|
} |
277 |
|
|
|
278 |
|
|
|
279 |
gwlarson |
2.5 |
int |
280 |
greg |
1.1 |
getexpos(s) /* get exposure from header line */ |
281 |
|
|
char *s; |
282 |
|
|
{ |
283 |
greg |
1.13 |
char fmt[32]; |
284 |
|
|
|
285 |
greg |
1.1 |
if (isexpos(s)) |
286 |
|
|
exposure *= exposval(s); |
287 |
greg |
1.13 |
else if (isformat(s)) { |
288 |
|
|
formatval(fmt, s); |
289 |
|
|
wrongformat = strcmp(fmt, COLRFMT); |
290 |
|
|
} |
291 |
gwlarson |
2.5 |
return(0); |
292 |
greg |
1.1 |
} |
293 |
|
|
|
294 |
|
|
|
295 |
|
|
open_pict(fn) /* open picture file */ |
296 |
|
|
char *fn; |
297 |
|
|
{ |
298 |
|
|
if ((pictfp = fopen(fn, "r")) == NULL) { |
299 |
greg |
2.3 |
fprintf(stderr, "%s: cannot open\n", fn); |
300 |
greg |
1.1 |
exit(1); |
301 |
|
|
} |
302 |
|
|
exposure = 1.0; |
303 |
greg |
1.13 |
getheader(pictfp, getexpos, NULL); |
304 |
greg |
1.21 |
if (wrongformat || !fscnresolu(&pxsiz, &pysiz, pictfp)) { |
305 |
|
|
fprintf(stderr, "%s: incompatible picture format\n", fn); |
306 |
greg |
1.1 |
exit(1); |
307 |
|
|
} |
308 |
greg |
1.8 |
initscans(); |
309 |
greg |
1.1 |
} |
310 |
|
|
|
311 |
|
|
|
312 |
|
|
close_pict() /* done with picture */ |
313 |
|
|
{ |
314 |
|
|
if (pictfp == NULL) |
315 |
|
|
return; |
316 |
|
|
fclose(pictfp); |
317 |
greg |
1.8 |
donescans(); |
318 |
greg |
1.1 |
pictfp = NULL; |
319 |
|
|
} |
320 |
|
|
|
321 |
|
|
|
322 |
|
|
fork_rtrace(av) /* open pipe and start rtrace */ |
323 |
|
|
char *av[]; |
324 |
|
|
{ |
325 |
greg |
1.19 |
int rval; |
326 |
greg |
1.1 |
|
327 |
schorsch |
2.7 |
rval = open_process(&rt_pd, av); |
328 |
greg |
1.19 |
if (rval < 0) { |
329 |
greg |
1.1 |
perror(progname); |
330 |
|
|
exit(1); |
331 |
|
|
} |
332 |
greg |
1.19 |
if (rval == 0) { |
333 |
|
|
fprintf(stderr, "%s: command not found\n", av[0]); |
334 |
greg |
1.1 |
exit(1); |
335 |
|
|
} |
336 |
greg |
1.19 |
maxpix = rval/(6*sizeof(float)); |
337 |
|
|
if (maxpix > MAXPIX) |
338 |
|
|
maxpix = MAXPIX; |
339 |
|
|
maxpix--; |
340 |
greg |
1.1 |
} |
341 |
|
|
|
342 |
|
|
|
343 |
|
|
done_rtrace() /* wait for rtrace to finish */ |
344 |
|
|
{ |
345 |
greg |
1.19 |
int status; |
346 |
greg |
1.1 |
|
347 |
schorsch |
2.7 |
status = close_process(&rt_pd); |
348 |
greg |
1.19 |
if (status > 0) { |
349 |
greg |
1.1 |
fprintf(stderr, "%s: bad status (%d) from rtrace\n", |
350 |
|
|
progname, status); |
351 |
|
|
exit(1); |
352 |
|
|
} |
353 |
schorsch |
2.7 |
rt_pd.r = -1; |
354 |
greg |
1.8 |
} |
355 |
|
|
|
356 |
|
|
|
357 |
|
|
SCAN * |
358 |
|
|
scanretire() /* retire old scanlines to free list */ |
359 |
|
|
{ |
360 |
|
|
SCAN *sold[NRETIRE]; |
361 |
|
|
int n; |
362 |
|
|
int h; |
363 |
|
|
register SCAN *sl; |
364 |
|
|
register int i; |
365 |
|
|
/* grab the NRETIRE oldest scanlines */ |
366 |
|
|
sold[n = 0] = NULL; |
367 |
greg |
1.10 |
for (h = 0; h < HSIZE; h++) |
368 |
|
|
for (sl = hashtab[h]; sl != NULL; sl = sl->next) { |
369 |
|
|
for (i = n; i && sold[i-1]->lused > sl->lused; i--) |
370 |
|
|
if (i < NRETIRE) |
371 |
greg |
1.8 |
sold[i] = sold[i-1]; |
372 |
|
|
if (i < NRETIRE) { |
373 |
greg |
1.10 |
sold[i] = sl; |
374 |
greg |
1.8 |
if (n < NRETIRE) /* grow list */ |
375 |
|
|
n++; |
376 |
greg |
1.10 |
} |
377 |
|
|
} |
378 |
|
|
/* put scanlines into free list */ |
379 |
|
|
for (i = 0; i < n; i++) { |
380 |
|
|
h = shash(sold[i]->y); |
381 |
|
|
sl = hashtab[h]; |
382 |
|
|
if (sl == sold[i]) |
383 |
|
|
hashtab[h] = sl->next; |
384 |
|
|
else { |
385 |
|
|
while (sl->next != sold[i]) /* IS in list */ |
386 |
greg |
1.8 |
sl = sl->next; |
387 |
greg |
1.10 |
sl->next = sold[i]->next; |
388 |
greg |
1.8 |
} |
389 |
greg |
1.10 |
if (i > 0) { /* save oldest as return value */ |
390 |
|
|
sold[i]->next = freelist; |
391 |
|
|
freelist = sold[i]; |
392 |
|
|
} |
393 |
greg |
1.8 |
} |
394 |
|
|
return(sold[0]); |
395 |
|
|
} |
396 |
|
|
|
397 |
|
|
|
398 |
|
|
static char *scan_buf; |
399 |
|
|
|
400 |
|
|
|
401 |
|
|
initscans() /* initialize scanline buffers */ |
402 |
|
|
{ |
403 |
|
|
int scansize; |
404 |
|
|
register SCAN *ptr; |
405 |
|
|
register int i; |
406 |
|
|
/* initialize positions */ |
407 |
greg |
2.2 |
scanpos = (long *)bmalloc(pysiz*sizeof(long)); |
408 |
greg |
1.8 |
if (scanpos == NULL) |
409 |
|
|
memerr("scanline positions"); |
410 |
|
|
for (i = pysiz-1; i >= 0; i--) |
411 |
|
|
scanpos[i] = -1L; |
412 |
|
|
curpos = pysiz-1; |
413 |
|
|
/* clear hash table */ |
414 |
|
|
for (i = 0; i < HSIZE; i++) |
415 |
|
|
hashtab[i] = NULL; |
416 |
|
|
/* allocate scanline buffers */ |
417 |
|
|
scansize = sizeof(SCAN) + pxsiz*sizeof(COLR); |
418 |
greg |
2.8 |
#ifdef ALIGNT |
419 |
|
|
scansize = scansize+(sizeof(ALIGNT)-1) & ~(sizeof(ALIGNT)-1); |
420 |
greg |
1.8 |
#endif |
421 |
|
|
i = MAXSBUF / scansize; /* compute number to allocate */ |
422 |
|
|
if (i > HSIZE) |
423 |
|
|
i = HSIZE; |
424 |
greg |
2.2 |
scanbufsiz = i*scansize; |
425 |
|
|
scan_buf = bmalloc(scanbufsiz); /* get in one big chunk */ |
426 |
greg |
1.8 |
if (scan_buf == NULL) |
427 |
|
|
memerr("scanline buffers"); |
428 |
|
|
ptr = (SCAN *)scan_buf; |
429 |
|
|
freelist = NULL; /* build our free list */ |
430 |
|
|
while (i-- > 0) { |
431 |
|
|
ptr->y = -1; |
432 |
|
|
ptr->lused = -1; |
433 |
|
|
ptr->next = freelist; |
434 |
|
|
freelist = ptr; |
435 |
|
|
ptr = (SCAN *)((char *)ptr + scansize); /* beware of C bugs */ |
436 |
|
|
} |
437 |
|
|
} |
438 |
|
|
|
439 |
|
|
|
440 |
|
|
donescans() /* free up scanlines */ |
441 |
|
|
{ |
442 |
greg |
2.2 |
bfree(scan_buf, scanbufsiz); |
443 |
|
|
bfree((char *)scanpos, pysiz*sizeof(long)); |
444 |
greg |
1.1 |
} |