1 |
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/* Copyright (c) 1991 Regents of the University of California */ |
2 |
– |
|
1 |
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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 |
– |
|
4 |
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/* |
5 |
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* Compute pixels for glare calculation |
6 |
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*/ |
7 |
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|
8 |
+ |
#include "copyright.h" |
9 |
+ |
|
10 |
+ |
#include <string.h> |
11 |
+ |
|
12 |
+ |
#include "rtprocess.h" /* Windows: must come first because of conflicts */ |
13 |
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#include "glare.h" |
12 |
– |
#include <sys/param.h> |
13 |
– |
/* compute rtrace buffer size */ |
14 |
– |
#ifndef PIPE_BUF |
15 |
– |
#define PIPE_BUF 512 /* hyperconservative */ |
16 |
– |
#endif |
17 |
– |
#define MAXPIX (PIPE_BUF/(6*sizeof(float)) - 1) |
14 |
|
|
15 |
< |
#ifndef BSD |
16 |
< |
#define vfork fork |
21 |
< |
#endif |
15 |
> |
/* maximum rtrace buffer size */ |
16 |
> |
#define MAXPIX (4096/(6*sizeof(float))) |
17 |
|
|
18 |
< |
#define NSCANS 64 /* number of scanlines to buffer */ |
18 |
> |
#define MAXSBUF 786432 /* maximum total size of scanline buffer */ |
19 |
> |
#define HSIZE 317 /* size of scanline hash table */ |
20 |
> |
#define NRETIRE 16 /* number of scanlines to retire at once */ |
21 |
|
|
22 |
< |
int rt_pid = -1; /* process id for rtrace */ |
26 |
< |
int fd_tort, fd_fromrt; /* pipe descriptors */ |
22 |
> |
static SUBPROC rt_pd = SP_INACTIVE; /* process id & descriptors for rtrace */ |
23 |
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|
24 |
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FILE *pictfp = NULL; /* picture file pointer */ |
25 |
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double exposure; /* picture exposure */ |
26 |
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int pxsiz, pysiz; /* picture dimensions */ |
27 |
< |
int curpos; /* current scanline */ |
28 |
< |
long *scanpos; /* scanline positions */ |
29 |
< |
struct { |
30 |
< |
long lused; /* for LRU replacement */ |
27 |
> |
|
28 |
> |
static int curpos; /* current scanline */ |
29 |
> |
static long *scanpos; /* scanline positions */ |
30 |
> |
|
31 |
> |
typedef struct scan { |
32 |
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int y; /* scanline position */ |
33 |
< |
COLR *sl; /* scanline contents */ |
34 |
< |
} scan[NSCANS]; /* buffered scanlines */ |
33 |
> |
long lused; /* for LRU replacement */ |
34 |
> |
struct scan *next; /* next in this hash or free list */ |
35 |
> |
/* followed by the scanline data */ |
36 |
> |
} SCAN; /* buffered scanline */ |
37 |
|
|
38 |
+ |
#define scandata(sl) ((COLR *)((sl)+1)) |
39 |
+ |
#define shash(y) ((y)%HSIZE) |
40 |
+ |
|
41 |
+ |
static int maxpix; /* maximum number of pixels to buffer */ |
42 |
+ |
|
43 |
+ |
static SCAN *freelist; /* scanline free list */ |
44 |
+ |
static SCAN *hashtab[HSIZE]; /* scanline hash table */ |
45 |
+ |
|
46 |
+ |
static long scanbufsiz; /* size of allocated scanline buffer */ |
47 |
+ |
|
48 |
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static long ncall = 0L; /* number of calls to getpictscan */ |
49 |
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static long nread = 0L; /* number of scanlines read */ |
50 |
+ |
static long nrecl = 0L; /* number of scanlines reclaimed */ |
51 |
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|
52 |
+ |
static int wrongformat = 0; |
53 |
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|
54 |
+ |
SCAN *scanretire(); |
55 |
+ |
|
56 |
+ |
extern long ftell(); |
57 |
+ |
|
58 |
+ |
|
59 |
+ |
SCAN * |
60 |
+ |
claimscan(y) /* claim scanline from buffers */ |
61 |
+ |
int y; |
62 |
+ |
{ |
63 |
+ |
int hi = shash(y); |
64 |
+ |
SCAN *slast; |
65 |
+ |
register SCAN *sl; |
66 |
+ |
|
67 |
+ |
for (sl = hashtab[hi]; sl != NULL; sl = sl->next) |
68 |
+ |
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 |
+ |
nrecl++; |
80 |
+ |
} |
81 |
+ |
return(sl); |
82 |
+ |
} |
83 |
+ |
return(scanretire()); /* need more free scanlines */ |
84 |
+ |
} |
85 |
+ |
|
86 |
+ |
|
87 |
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COLR * |
88 |
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getpictscan(y) /* get picture scanline */ |
89 |
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int y; |
90 |
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{ |
91 |
< |
extern long ftell(); |
48 |
< |
int minused; |
91 |
> |
register SCAN *sl; |
92 |
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register int i; |
93 |
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/* first check our buffers */ |
94 |
< |
ncall++; |
95 |
< |
minused = 0; |
96 |
< |
for (i = 0; i < NSCANS; i++) { |
97 |
< |
if (scan[i].y == y) { |
98 |
< |
scan[i].lused = ncall; |
99 |
< |
return(scan[i].sl); |
100 |
< |
} |
101 |
< |
if (scan[i].lused < scan[minused].lused) |
102 |
< |
minused = i; |
103 |
< |
} |
104 |
< |
/* not there, read it in */ |
105 |
< |
if (scanpos[y] == -1) { /* need to search */ |
106 |
< |
while (curpos > y) { |
94 |
> |
sl = claimscan(y); |
95 |
> |
if (sl == NULL) |
96 |
> |
memerr("claimscan()"); |
97 |
> |
sl->lused = ncall++; |
98 |
> |
if (sl->y == y) /* scan hit */ |
99 |
> |
return(scandata(sl)); |
100 |
> |
/* else read in replacement */ |
101 |
> |
if (scanpos[y] < 0) { /* need to search */ |
102 |
> |
for (i = y+1; i < curpos; i++) |
103 |
> |
if (scanpos[i] >= 0) { |
104 |
> |
if (fseek(pictfp, scanpos[i], 0) < 0) |
105 |
> |
goto seekerr; |
106 |
> |
curpos = i; |
107 |
> |
break; |
108 |
> |
} |
109 |
> |
while (curpos >= y) { |
110 |
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scanpos[curpos] = ftell(pictfp); |
111 |
< |
if (freadcolrs(scan[minused].sl, pxsiz, pictfp) < 0) |
111 |
> |
if (freadcolrs(scandata(sl), pxsiz, pictfp) < 0) |
112 |
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goto readerr; |
113 |
+ |
nread++; |
114 |
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curpos--; |
115 |
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} |
116 |
< |
} else if (fseek(pictfp, scanpos[y], 0) < 0) { |
117 |
< |
fprintf(stderr, "%s: picture seek error\n", progname); |
118 |
< |
exit(1); |
116 |
> |
} else { |
117 |
> |
if (curpos != y && fseek(pictfp, scanpos[y], 0) < 0) |
118 |
> |
goto seekerr; |
119 |
> |
if (freadcolrs(scandata(sl), pxsiz, pictfp) < 0) |
120 |
> |
goto readerr; |
121 |
> |
nread++; |
122 |
> |
curpos = y-1; |
123 |
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} |
124 |
< |
if (freadcolrs(scan[minused].sl, pxsiz, pictfp) < 0) |
125 |
< |
goto readerr; |
126 |
< |
nread++; |
127 |
< |
curpos = y-1; |
128 |
< |
scan[minused].lused = ncall; |
78 |
< |
scan[minused].y = y; |
79 |
< |
return(scan[minused].sl); |
124 |
> |
sl->y = y; |
125 |
> |
i = shash(y); /* add to hash list */ |
126 |
> |
sl->next = hashtab[i]; |
127 |
> |
hashtab[i] = sl; |
128 |
> |
return(scandata(sl)); |
129 |
|
readerr: |
130 |
|
fprintf(stderr, "%s: picture read error\n", progname); |
131 |
|
exit(1); |
132 |
+ |
seekerr: |
133 |
+ |
fprintf(stderr, "%s: picture seek error\n", progname); |
134 |
+ |
exit(1); |
135 |
|
} |
136 |
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|
137 |
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|
138 |
+ |
#ifdef DEBUG |
139 |
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pict_stats() /* print out picture read statistics */ |
140 |
|
{ |
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 |
+ |
static long lastrecl = 0L; /* nrecl at last report */ |
144 |
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|
145 |
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if (ncall == lastcall) |
146 |
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return; |
147 |
< |
fprintf(stderr, "%s: %ld scanlines read, %ld reused\n", |
148 |
< |
progname, nread-lastread, |
95 |
< |
(ncall-lastcall)-(nread-lastread)); |
147 |
> |
fprintf(stderr, "%s: %ld scanlines read (%ld reclaimed) in %ld calls\n", |
148 |
> |
progname, nread-lastread, nrecl-lastrecl, ncall-lastcall); |
149 |
|
lastcall = ncall; |
150 |
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lastread = nread; |
151 |
+ |
lastrecl = nrecl; |
152 |
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} |
153 |
+ |
#endif |
154 |
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|
155 |
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|
156 |
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double |
158 |
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FVECT vd; |
159 |
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{ |
160 |
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FVECT pp; |
161 |
< |
double vpx, vpy, vpz; |
161 |
> |
FVECT ip; |
162 |
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COLOR res; |
163 |
|
|
164 |
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if (pictfp == NULL) |
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 |
< |
viewpixel(&vpx, &vpy, &vpz, &pictview, pp); |
170 |
< |
if (vpz <= FTINY || vpx < 0. || vpx >= 1. || vpy < 0. || vpy >= 1.) |
169 |
> |
viewloc(ip, &pictview, pp); |
170 |
> |
if (ip[2] <= FTINY || ip[0] < 0. || ip[0] >= 1. || |
171 |
> |
ip[1] < 0. || ip[1] >= 1.) |
172 |
|
return(-1.0); |
173 |
< |
colr_color(res, getpictscan((int)(vpy*pysiz))[(int)(vpx*pxsiz)]); |
173 |
> |
colr_color(res, getpictscan((int)(ip[1]*pysiz))[(int)(ip[0]*pxsiz)]); |
174 |
|
return(luminance(res)/exposure); |
175 |
|
} |
176 |
|
|
180 |
|
int vh, vv; |
181 |
|
{ |
182 |
|
FVECT dir; |
183 |
< |
float rt_buf[6]; |
183 |
> |
float rt_buf[12]; |
184 |
|
double res; |
185 |
|
|
186 |
|
if (compdir(dir, vh, vv) < 0) |
187 |
|
return(-1.0); |
188 |
+ |
npixinvw++; |
189 |
|
if ((res = pict_val(dir)) >= 0.0) |
190 |
|
return(res); |
191 |
< |
if (rt_pid == -1) |
191 |
> |
if (rt_pd.r == -1) { |
192 |
> |
npixmiss++; |
193 |
|
return(-1.0); |
194 |
+ |
} |
195 |
|
rt_buf[0] = ourview.vp[0]; |
196 |
|
rt_buf[1] = ourview.vp[1]; |
197 |
|
rt_buf[2] = ourview.vp[2]; |
220 |
|
#endif |
221 |
|
n = 0; |
222 |
|
for (vh = -hsize; vh <= hsize; vh++) { |
223 |
< |
if (compdir(dir, vh, vv) < 0) { /* off viewable region */ |
223 |
> |
if (compdir(dir, vh, vv) < 0) { /* not in view */ |
224 |
|
vb[vh+hsize] = -1.0; |
225 |
|
continue; |
226 |
|
} |
227 |
+ |
npixinvw++; |
228 |
|
if ((vb[vh+hsize] = pict_val(dir)) >= 0.0) |
229 |
|
continue; |
230 |
< |
if (rt_pid == -1) /* missing information */ |
230 |
> |
if (rt_pd.r == -1) { /* missing information */ |
231 |
> |
npixmiss++; |
232 |
|
continue; |
233 |
+ |
} |
234 |
|
/* send to rtrace */ |
235 |
< |
if (n >= MAXPIX) { /* flush */ |
235 |
> |
if (n >= maxpix) { /* flush */ |
236 |
|
rt_compute(rt_buf, n); |
237 |
|
while (n-- > 0) |
238 |
|
vb[buf_vh[n]+hsize] = luminance(rt_buf+3*n); |
261 |
|
float *pb; |
262 |
|
int np; |
263 |
|
{ |
202 |
– |
static float nbuf[6] = {0.,0.,0.,0.,0.,0.}; |
203 |
– |
|
264 |
|
#ifdef DEBUG |
265 |
|
if (verbose && np > 1) |
266 |
|
fprintf(stderr, "%s: sending %d samples to rtrace...\n", |
267 |
|
progname, np); |
268 |
|
#endif |
269 |
< |
if (writebuf(fd_tort,(char *)pb,6*sizeof(float)*np) < 6*sizeof(float)*np |
270 |
< |
|| writebuf(fd_tort,(char *)nbuf,sizeof(nbuf)) < sizeof(nbuf)) { |
271 |
< |
fprintf(stderr, "%s: error writing to rtrace process\n", |
269 |
> |
memset(pb+6*np, '\0', 6*sizeof(float)); |
270 |
> |
if (process(&rt_pd, (char *)pb, (char *)pb, 3*sizeof(float)*(np+1), |
271 |
> |
6*sizeof(float)*(np+1)) < 3*sizeof(float)*(np+1)) { |
272 |
> |
fprintf(stderr, "%s: rtrace communication error\n", |
273 |
|
progname); |
274 |
|
exit(1); |
275 |
|
} |
215 |
– |
if (readbuf(fd_fromrt, (char *)pb, 3*sizeof(float)*np) |
216 |
– |
< 3*sizeof(float)*np) { |
217 |
– |
fprintf(stderr, "%s: error reading from rtrace process\n", |
218 |
– |
progname); |
219 |
– |
exit(1); |
220 |
– |
} |
276 |
|
} |
277 |
|
|
278 |
|
|
279 |
+ |
int |
280 |
|
getexpos(s) /* get exposure from header line */ |
281 |
|
char *s; |
282 |
|
{ |
283 |
+ |
char fmt[32]; |
284 |
+ |
|
285 |
|
if (isexpos(s)) |
286 |
|
exposure *= exposval(s); |
287 |
+ |
else if (isformat(s)) { |
288 |
+ |
formatval(fmt, s); |
289 |
+ |
wrongformat = strcmp(fmt, COLRFMT); |
290 |
+ |
} |
291 |
+ |
return(0); |
292 |
|
} |
293 |
|
|
294 |
|
|
295 |
|
open_pict(fn) /* open picture file */ |
296 |
|
char *fn; |
297 |
|
{ |
235 |
– |
register int i; |
236 |
– |
|
298 |
|
if ((pictfp = fopen(fn, "r")) == NULL) { |
299 |
< |
fprintf("%s: cannot open\n", fn); |
299 |
> |
fprintf(stderr, "%s: cannot open\n", fn); |
300 |
|
exit(1); |
301 |
|
} |
302 |
|
exposure = 1.0; |
303 |
< |
getheader(pictfp, getexpos); |
304 |
< |
if (fgetresolu(&pxsiz, &pysiz, pictfp) != (YMAJOR|YDECR)) { |
305 |
< |
fprintf("%s: bad picture resolution\n", fn); |
303 |
> |
getheader(pictfp, getexpos, NULL); |
304 |
> |
if (wrongformat || !fscnresolu(&pxsiz, &pysiz, pictfp)) { |
305 |
> |
fprintf(stderr, "%s: incompatible picture format\n", fn); |
306 |
|
exit(1); |
307 |
|
} |
308 |
< |
scanpos = (long *)malloc(pysiz*sizeof(long)); |
248 |
< |
if (scanpos == NULL) |
249 |
< |
memerr("scanline positions"); |
250 |
< |
for (i = 0; i < pysiz; i++) |
251 |
< |
scanpos[i] = -1L; |
252 |
< |
for (i = 0; i < NSCANS; i++) { |
253 |
< |
scan[i].lused = -1; |
254 |
< |
scan[i].y = -1; |
255 |
< |
scan[i].sl = (COLR *)malloc(pxsiz*sizeof(COLR)); |
256 |
< |
if (scan[i].sl == NULL) |
257 |
< |
memerr("scanline buffers"); |
258 |
< |
} |
259 |
< |
curpos = pysiz-1; |
308 |
> |
initscans(); |
309 |
|
} |
310 |
|
|
311 |
|
|
312 |
|
close_pict() /* done with picture */ |
313 |
|
{ |
265 |
– |
register int i; |
266 |
– |
|
314 |
|
if (pictfp == NULL) |
315 |
|
return; |
316 |
|
fclose(pictfp); |
317 |
< |
free((char *)scanpos); |
271 |
< |
for (i = 0; i < NSCANS; i++) |
272 |
< |
free((char *)scan[i].sl); |
317 |
> |
donescans(); |
318 |
|
pictfp = NULL; |
319 |
|
} |
320 |
|
|
322 |
|
fork_rtrace(av) /* open pipe and start rtrace */ |
323 |
|
char *av[]; |
324 |
|
{ |
325 |
< |
int p0[2], p1[2]; |
325 |
> |
int rval; |
326 |
|
|
327 |
< |
if (pipe(p0) < 0 || pipe(p1) < 0) { |
327 |
> |
rval = open_process(&rt_pd, av); |
328 |
> |
if (rval < 0) { |
329 |
|
perror(progname); |
330 |
|
exit(1); |
331 |
|
} |
332 |
< |
if ((rt_pid = vfork()) == 0) { /* if child */ |
333 |
< |
close(p0[1]); |
288 |
< |
close(p1[0]); |
289 |
< |
if (p0[0] != 0) { /* connect p0 to stdin */ |
290 |
< |
dup2(p0[0], 0); |
291 |
< |
close(p0[0]); |
292 |
< |
} |
293 |
< |
if (p1[1] != 0) { /* connect p1 to stdout */ |
294 |
< |
dup2(p1[1], 1); |
295 |
< |
close(p1[1]); |
296 |
< |
} |
297 |
< |
execvp(av[0], av); |
298 |
< |
perror(av[0]); |
299 |
< |
_exit(127); |
300 |
< |
} |
301 |
< |
if (rt_pid == -1) { |
302 |
< |
perror(progname); |
332 |
> |
if (rval == 0) { |
333 |
> |
fprintf(stderr, "%s: command not found\n", av[0]); |
334 |
|
exit(1); |
335 |
|
} |
336 |
< |
close(p0[0]); |
337 |
< |
close(p1[1]); |
338 |
< |
fd_tort = p0[1]; |
339 |
< |
fd_fromrt = p1[0]; |
336 |
> |
maxpix = rval/(6*sizeof(float)); |
337 |
> |
if (maxpix > MAXPIX) |
338 |
> |
maxpix = MAXPIX; |
339 |
> |
maxpix--; |
340 |
|
} |
341 |
|
|
342 |
|
|
343 |
|
done_rtrace() /* wait for rtrace to finish */ |
344 |
|
{ |
345 |
< |
int pid, status; |
345 |
> |
int status; |
346 |
|
|
347 |
< |
if (rt_pid == -1) |
348 |
< |
return; |
318 |
< |
close(fd_tort); |
319 |
< |
close(fd_fromrt); |
320 |
< |
while ((pid = wait(&status)) != -1 && pid != rt_pid) |
321 |
< |
; |
322 |
< |
if (pid == rt_pid && status != 0) { |
347 |
> |
status = close_process(&rt_pd); |
348 |
> |
if (status > 0) { |
349 |
|
fprintf(stderr, "%s: bad status (%d) from rtrace\n", |
350 |
|
progname, status); |
351 |
|
exit(1); |
352 |
|
} |
353 |
< |
rt_pid = -1; |
353 |
> |
rt_pd.r = -1; |
354 |
|
} |
355 |
|
|
356 |
|
|
357 |
< |
int |
358 |
< |
readbuf(fd, bpos, siz) |
333 |
< |
int fd; |
334 |
< |
char *bpos; |
335 |
< |
int siz; |
357 |
> |
SCAN * |
358 |
> |
scanretire() /* retire old scanlines to free list */ |
359 |
|
{ |
360 |
< |
register int cc, nrem = siz; |
361 |
< |
|
362 |
< |
while (nrem > 0 && (cc = read(fd, bpos, nrem)) > 0) { |
363 |
< |
bpos += cc; |
364 |
< |
nrem -= cc; |
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 |
> |
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 |
> |
sold[i] = sold[i-1]; |
372 |
> |
if (i < NRETIRE) { |
373 |
> |
sold[i] = sl; |
374 |
> |
if (n < NRETIRE) /* grow list */ |
375 |
> |
n++; |
376 |
> |
} |
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 |
> |
sl = sl->next; |
387 |
> |
sl->next = sold[i]->next; |
388 |
> |
} |
389 |
> |
if (i > 0) { /* save oldest as return value */ |
390 |
> |
sold[i]->next = freelist; |
391 |
> |
freelist = sold[i]; |
392 |
> |
} |
393 |
|
} |
394 |
< |
if (cc < 0) |
344 |
< |
return(cc); |
345 |
< |
return(siz-nrem); |
394 |
> |
return(sold[0]); |
395 |
|
} |
396 |
|
|
397 |
|
|
398 |
< |
int |
350 |
< |
writebuf(fd, bpos, siz) |
351 |
< |
char *bpos; |
352 |
< |
int siz; |
353 |
< |
{ |
354 |
< |
register int cc, nrem = siz; |
398 |
> |
static char *scan_buf; |
399 |
|
|
400 |
< |
while (nrem > 0 && (cc = write(fd, bpos, nrem)) > 0) { |
401 |
< |
bpos += cc; |
402 |
< |
nrem -= cc; |
400 |
> |
|
401 |
> |
initscans() /* initialize scanline buffers */ |
402 |
> |
{ |
403 |
> |
int scansize; |
404 |
> |
register SCAN *ptr; |
405 |
> |
register int i; |
406 |
> |
/* initialize positions */ |
407 |
> |
scanpos = (long *)bmalloc(pysiz*sizeof(long)); |
408 |
> |
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 |
> |
#ifdef ALIGNT |
419 |
> |
scansize = scansize+(sizeof(ALIGNT)-1) & ~(sizeof(ALIGNT)-1); |
420 |
> |
#endif |
421 |
> |
i = MAXSBUF / scansize; /* compute number to allocate */ |
422 |
> |
if (i > HSIZE) |
423 |
> |
i = HSIZE; |
424 |
> |
scanbufsiz = i*scansize; |
425 |
> |
scan_buf = bmalloc(scanbufsiz); /* get in one big chunk */ |
426 |
> |
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 |
< |
if (cc < 0) |
438 |
< |
return(cc); |
439 |
< |
return(siz-nrem); |
437 |
> |
} |
438 |
> |
|
439 |
> |
|
440 |
> |
donescans() /* free up scanlines */ |
441 |
> |
{ |
442 |
> |
bfree(scan_buf, scanbufsiz); |
443 |
> |
bfree((char *)scanpos, pysiz*sizeof(long)); |
444 |
|
} |