9 |
|
*/ |
10 |
|
|
11 |
|
#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) |
12 |
> |
#include "resolu.h" |
13 |
> |
/* maximum rtrace buffer size */ |
14 |
> |
#define MAXPIX (4096/(6*sizeof(float))) |
15 |
|
|
16 |
< |
#ifndef BSD |
17 |
< |
#define vfork fork |
18 |
< |
#endif |
16 |
> |
#define MAXSBUF 786432 /* maximum total size of scanline buffer */ |
17 |
> |
#define HSIZE 317 /* size of scanline hash table */ |
18 |
> |
#define NRETIRE 16 /* number of scanlines to retire at once */ |
19 |
|
|
20 |
< |
#define NSCANS 64 /* number of scanlines to buffer */ |
20 |
> |
int rt_pd[3] = {-1,-1,-1}; /* process id & descriptors for rtrace */ |
21 |
|
|
25 |
– |
int rt_pid = -1; /* process id for rtrace */ |
26 |
– |
int fd_tort, fd_fromrt; /* pipe descriptors */ |
27 |
– |
|
22 |
|
FILE *pictfp = NULL; /* picture file pointer */ |
23 |
|
double exposure; /* picture exposure */ |
24 |
|
int pxsiz, pysiz; /* picture dimensions */ |
25 |
< |
int curpos; /* current scanline */ |
26 |
< |
long *scanpos; /* scanline positions */ |
27 |
< |
struct { |
28 |
< |
long lused; /* for LRU replacement */ |
25 |
> |
|
26 |
> |
static int curpos; /* current scanline */ |
27 |
> |
static long *scanpos; /* scanline positions */ |
28 |
> |
|
29 |
> |
typedef struct scan { |
30 |
|
int y; /* scanline position */ |
31 |
< |
COLR *sl; /* scanline contents */ |
32 |
< |
} scan[NSCANS]; /* buffered scanlines */ |
31 |
> |
long lused; /* for LRU replacement */ |
32 |
> |
struct scan *next; /* next in this hash or free list */ |
33 |
> |
/* followed by the scanline data */ |
34 |
> |
} SCAN; /* buffered scanline */ |
35 |
|
|
36 |
+ |
#define scandata(sl) ((COLR *)((sl)+1)) |
37 |
+ |
#define shash(y) ((y)%HSIZE) |
38 |
+ |
|
39 |
+ |
static int maxpix; /* maximum number of pixels to buffer */ |
40 |
+ |
|
41 |
+ |
static SCAN *freelist; /* scanline free list */ |
42 |
+ |
static SCAN *hashtab[HSIZE]; /* scanline hash table */ |
43 |
+ |
|
44 |
|
static long ncall = 0L; /* number of calls to getpictscan */ |
45 |
|
static long nread = 0L; /* number of scanlines read */ |
46 |
+ |
static long nrecl = 0L; /* number of scanlines reclaimed */ |
47 |
|
|
48 |
+ |
static int wrongformat = 0; |
49 |
|
|
50 |
+ |
SCAN *scanretire(); |
51 |
+ |
|
52 |
+ |
extern long ftell(); |
53 |
+ |
|
54 |
+ |
|
55 |
+ |
SCAN * |
56 |
+ |
claimscan(y) /* claim scanline from buffers */ |
57 |
+ |
int y; |
58 |
+ |
{ |
59 |
+ |
int hi = shash(y); |
60 |
+ |
SCAN *slast; |
61 |
+ |
register SCAN *sl; |
62 |
+ |
|
63 |
+ |
for (sl = hashtab[hi]; sl != NULL; sl = sl->next) |
64 |
+ |
if (sl->y == y) /* active scanline */ |
65 |
+ |
return(sl); |
66 |
+ |
for (slast = NULL, sl = freelist; sl != NULL; slast = sl, sl = sl->next) |
67 |
+ |
if (sl->y == -1 || sl->y == y || sl->next == NULL) { |
68 |
+ |
if (slast == NULL) /* remove from free */ |
69 |
+ |
freelist = sl->next; |
70 |
+ |
else |
71 |
+ |
slast->next = sl->next; |
72 |
+ |
if (sl->y == y) { /* reclaim */ |
73 |
+ |
sl->next = hashtab[hi]; |
74 |
+ |
hashtab[hi] = sl; |
75 |
+ |
nrecl++; |
76 |
+ |
} |
77 |
+ |
return(sl); |
78 |
+ |
} |
79 |
+ |
return(scanretire()); /* need more free scanlines */ |
80 |
+ |
} |
81 |
+ |
|
82 |
+ |
|
83 |
|
COLR * |
84 |
|
getpictscan(y) /* get picture scanline */ |
85 |
|
int y; |
86 |
|
{ |
87 |
< |
extern long ftell(); |
48 |
< |
int minused; |
87 |
> |
register SCAN *sl; |
88 |
|
register int i; |
89 |
|
/* first check our buffers */ |
90 |
< |
ncall++; |
91 |
< |
minused = 0; |
92 |
< |
for (i = 0; i < NSCANS; i++) { |
93 |
< |
if (scan[i].y == y) { |
94 |
< |
scan[i].lused = ncall; |
95 |
< |
return(scan[i].sl); |
96 |
< |
} |
97 |
< |
if (scan[i].lused < scan[minused].lused) |
98 |
< |
minused = i; |
99 |
< |
} |
100 |
< |
/* not there, read it in */ |
101 |
< |
if (scanpos[y] == -1) { /* need to search */ |
102 |
< |
while (curpos > y) { |
90 |
> |
sl = claimscan(y); |
91 |
> |
if (sl == NULL) |
92 |
> |
memerr("claimscan()"); |
93 |
> |
sl->lused = ncall++; |
94 |
> |
if (sl->y == y) /* scan hit */ |
95 |
> |
return(scandata(sl)); |
96 |
> |
/* else read in replacement */ |
97 |
> |
if (scanpos[y] < 0) { /* need to search */ |
98 |
> |
for (i = y+1; i < curpos; i++) |
99 |
> |
if (scanpos[i] >= 0) { |
100 |
> |
if (fseek(pictfp, scanpos[i], 0) < 0) |
101 |
> |
goto seekerr; |
102 |
> |
curpos = i; |
103 |
> |
break; |
104 |
> |
} |
105 |
> |
while (curpos >= y) { |
106 |
|
scanpos[curpos] = ftell(pictfp); |
107 |
< |
if (freadcolrs(scan[minused].sl, pxsiz, pictfp) < 0) |
107 |
> |
if (freadcolrs(scandata(sl), pxsiz, pictfp) < 0) |
108 |
|
goto readerr; |
109 |
+ |
nread++; |
110 |
|
curpos--; |
111 |
|
} |
112 |
< |
} else if (fseek(pictfp, scanpos[y], 0) < 0) { |
113 |
< |
fprintf(stderr, "%s: picture seek error\n", progname); |
114 |
< |
exit(1); |
112 |
> |
} else { |
113 |
> |
if (curpos != y && fseek(pictfp, scanpos[y], 0) < 0) |
114 |
> |
goto seekerr; |
115 |
> |
if (freadcolrs(scandata(sl), pxsiz, pictfp) < 0) |
116 |
> |
goto readerr; |
117 |
> |
nread++; |
118 |
> |
curpos = y-1; |
119 |
|
} |
120 |
< |
if (freadcolrs(scan[minused].sl, pxsiz, pictfp) < 0) |
121 |
< |
goto readerr; |
122 |
< |
nread++; |
123 |
< |
curpos = y-1; |
124 |
< |
scan[minused].lused = ncall; |
78 |
< |
scan[minused].y = y; |
79 |
< |
return(scan[minused].sl); |
120 |
> |
sl->y = y; |
121 |
> |
i = shash(y); /* add to hash list */ |
122 |
> |
sl->next = hashtab[i]; |
123 |
> |
hashtab[i] = sl; |
124 |
> |
return(scandata(sl)); |
125 |
|
readerr: |
126 |
|
fprintf(stderr, "%s: picture read error\n", progname); |
127 |
|
exit(1); |
128 |
+ |
seekerr: |
129 |
+ |
fprintf(stderr, "%s: picture seek error\n", progname); |
130 |
+ |
exit(1); |
131 |
|
} |
132 |
|
|
133 |
|
|
134 |
+ |
#ifdef DEBUG |
135 |
|
pict_stats() /* print out picture read statistics */ |
136 |
|
{ |
137 |
|
static long lastcall = 0L; /* ncall at last report */ |
138 |
|
static long lastread = 0L; /* nread at last report */ |
139 |
+ |
static long lastrecl = 0L; /* nrecl at last report */ |
140 |
|
|
141 |
|
if (ncall == lastcall) |
142 |
|
return; |
143 |
< |
fprintf(stderr, "%s: %ld scanlines read, %ld reused\n", |
144 |
< |
progname, nread-lastread, |
95 |
< |
(ncall-lastcall)-(nread-lastread)); |
143 |
> |
fprintf(stderr, "%s: %ld scanlines read (%ld reclaimed) in %ld calls\n", |
144 |
> |
progname, nread-lastread, nrecl-lastrecl, ncall-lastcall); |
145 |
|
lastcall = ncall; |
146 |
|
lastread = nread; |
147 |
+ |
lastrecl = nrecl; |
148 |
|
} |
149 |
+ |
#endif |
150 |
|
|
151 |
|
|
152 |
|
double |
154 |
|
FVECT vd; |
155 |
|
{ |
156 |
|
FVECT pp; |
157 |
< |
double vpx, vpy, vpz; |
157 |
> |
FVECT ip; |
158 |
|
COLOR res; |
159 |
|
|
160 |
|
if (pictfp == NULL) |
162 |
|
pp[0] = pictview.vp[0] + vd[0]; |
163 |
|
pp[1] = pictview.vp[1] + vd[1]; |
164 |
|
pp[2] = pictview.vp[2] + vd[2]; |
165 |
< |
viewpixel(&vpx, &vpy, &vpz, &pictview, pp); |
166 |
< |
if (vpz <= FTINY || vpx < 0. || vpx >= 1. || vpy < 0. || vpy >= 1.) |
165 |
> |
viewloc(ip, &pictview, pp); |
166 |
> |
if (ip[2] <= FTINY || ip[0] < 0. || ip[0] >= 1. || |
167 |
> |
ip[1] < 0. || ip[1] >= 1.) |
168 |
|
return(-1.0); |
169 |
< |
colr_color(res, getpictscan((int)(vpy*pysiz))[(int)(vpx*pxsiz)]); |
169 |
> |
colr_color(res, getpictscan((int)(ip[1]*pysiz))[(int)(ip[0]*pxsiz)]); |
170 |
|
return(luminance(res)/exposure); |
171 |
|
} |
172 |
|
|
176 |
|
int vh, vv; |
177 |
|
{ |
178 |
|
FVECT dir; |
179 |
< |
float rt_buf[6]; |
179 |
> |
float rt_buf[12]; |
180 |
|
double res; |
181 |
|
|
182 |
|
if (compdir(dir, vh, vv) < 0) |
183 |
|
return(-1.0); |
184 |
+ |
npixinvw++; |
185 |
|
if ((res = pict_val(dir)) >= 0.0) |
186 |
|
return(res); |
187 |
< |
if (rt_pid == -1) |
187 |
> |
if (rt_pd[0] == -1) { |
188 |
> |
npixmiss++; |
189 |
|
return(-1.0); |
190 |
+ |
} |
191 |
|
rt_buf[0] = ourview.vp[0]; |
192 |
|
rt_buf[1] = ourview.vp[1]; |
193 |
|
rt_buf[2] = ourview.vp[2]; |
209 |
|
FVECT dir; |
210 |
|
register int vh; |
211 |
|
|
212 |
+ |
#ifdef DEBUG |
213 |
|
if (verbose) |
214 |
|
fprintf(stderr, "%s: computing view span at %d...\n", |
215 |
|
progname, vv); |
216 |
+ |
#endif |
217 |
|
n = 0; |
218 |
|
for (vh = -hsize; vh <= hsize; vh++) { |
219 |
< |
if (compdir(dir, vh, vv) < 0) { /* off viewable region */ |
219 |
> |
if (compdir(dir, vh, vv) < 0) { /* not in view */ |
220 |
|
vb[vh+hsize] = -1.0; |
221 |
|
continue; |
222 |
|
} |
223 |
+ |
npixinvw++; |
224 |
|
if ((vb[vh+hsize] = pict_val(dir)) >= 0.0) |
225 |
|
continue; |
226 |
< |
if (rt_pid == -1) /* missing information */ |
226 |
> |
if (rt_pd[0] == -1) { /* missing information */ |
227 |
> |
npixmiss++; |
228 |
|
continue; |
229 |
+ |
} |
230 |
|
/* send to rtrace */ |
231 |
< |
if (n >= MAXPIX) { /* flush */ |
231 |
> |
if (n >= maxpix) { /* flush */ |
232 |
|
rt_compute(rt_buf, n); |
233 |
|
while (n-- > 0) |
234 |
|
vb[buf_vh[n]+hsize] = luminance(rt_buf+3*n); |
241 |
|
rt_buf[6*n+5] = dir[2]; |
242 |
|
buf_vh[n++] = vh; |
243 |
|
} |
244 |
+ |
#ifdef DEBUG |
245 |
|
if (verbose) |
246 |
|
pict_stats(); |
247 |
+ |
#endif |
248 |
|
if (n > 0) { /* process pending buffer */ |
249 |
|
rt_compute(rt_buf, n); |
250 |
|
while (n-- > 0) |
257 |
|
float *pb; |
258 |
|
int np; |
259 |
|
{ |
260 |
< |
static float nbuf[6] = {0.,0.,0.,0.,0.,0.}; |
199 |
< |
|
260 |
> |
#ifdef DEBUG |
261 |
|
if (verbose && np > 1) |
262 |
|
fprintf(stderr, "%s: sending %d samples to rtrace...\n", |
263 |
|
progname, np); |
264 |
< |
if (writebuf(fd_tort,(char *)pb,6*sizeof(float)*np) < 6*sizeof(float)*np |
265 |
< |
|| writebuf(fd_tort,(char *)nbuf,sizeof(nbuf)) < sizeof(nbuf)) { |
266 |
< |
fprintf(stderr, "%s: error writing to rtrace process\n", |
264 |
> |
#endif |
265 |
> |
bzero(pb+6*np, 6*sizeof(float)); |
266 |
> |
if (process(rt_pd, pb, pb, 3*sizeof(float)*np, |
267 |
> |
6*sizeof(float)*(np+1)) < 3*sizeof(float)*np) { |
268 |
> |
fprintf(stderr, "%s: rtrace communication error\n", |
269 |
|
progname); |
270 |
|
exit(1); |
271 |
|
} |
209 |
– |
if (readbuf(fd_fromrt, (char *)pb, 3*sizeof(float)*np) |
210 |
– |
< 3*sizeof(float)*np) { |
211 |
– |
fprintf(stderr, "%s: error reading from rtrace process\n", |
212 |
– |
progname); |
213 |
– |
exit(1); |
214 |
– |
} |
272 |
|
} |
273 |
|
|
274 |
|
|
275 |
|
getexpos(s) /* get exposure from header line */ |
276 |
|
char *s; |
277 |
|
{ |
278 |
+ |
char fmt[32]; |
279 |
+ |
|
280 |
|
if (isexpos(s)) |
281 |
|
exposure *= exposval(s); |
282 |
+ |
else if (isformat(s)) { |
283 |
+ |
formatval(fmt, s); |
284 |
+ |
wrongformat = strcmp(fmt, COLRFMT); |
285 |
+ |
} |
286 |
|
} |
287 |
|
|
288 |
|
|
289 |
|
open_pict(fn) /* open picture file */ |
290 |
|
char *fn; |
291 |
|
{ |
229 |
– |
register int i; |
230 |
– |
|
292 |
|
if ((pictfp = fopen(fn, "r")) == NULL) { |
293 |
|
fprintf("%s: cannot open\n", fn); |
294 |
|
exit(1); |
295 |
|
} |
296 |
|
exposure = 1.0; |
297 |
< |
getheader(pictfp, getexpos); |
298 |
< |
if (fgetresolu(&pxsiz, &pysiz, pictfp) != (YMAJOR|YDECR)) { |
299 |
< |
fprintf("%s: bad picture resolution\n", fn); |
297 |
> |
getheader(pictfp, getexpos, NULL); |
298 |
> |
if (wrongformat || !fscnresolu(&pxsiz, &pysiz, pictfp)) { |
299 |
> |
fprintf(stderr, "%s: incompatible picture format\n", fn); |
300 |
|
exit(1); |
301 |
|
} |
302 |
< |
scanpos = (long *)malloc(pysiz*sizeof(long)); |
242 |
< |
if (scanpos == NULL) |
243 |
< |
memerr("scanline positions"); |
244 |
< |
for (i = 0; i < pysiz; i++) |
245 |
< |
scanpos[i] = -1L; |
246 |
< |
for (i = 0; i < NSCANS; i++) { |
247 |
< |
scan[i].lused = -1; |
248 |
< |
scan[i].y = -1; |
249 |
< |
scan[i].sl = (COLR *)malloc(pxsiz*sizeof(COLR)); |
250 |
< |
if (scan[i].sl == NULL) |
251 |
< |
memerr("scanline buffers"); |
252 |
< |
} |
253 |
< |
curpos = pysiz-1; |
302 |
> |
initscans(); |
303 |
|
} |
304 |
|
|
305 |
|
|
306 |
|
close_pict() /* done with picture */ |
307 |
|
{ |
259 |
– |
register int i; |
260 |
– |
|
308 |
|
if (pictfp == NULL) |
309 |
|
return; |
310 |
|
fclose(pictfp); |
311 |
< |
free((char *)scanpos); |
265 |
< |
for (i = 0; i < NSCANS; i++) |
266 |
< |
free((char *)scan[i].sl); |
311 |
> |
donescans(); |
312 |
|
pictfp = NULL; |
313 |
|
} |
314 |
|
|
316 |
|
fork_rtrace(av) /* open pipe and start rtrace */ |
317 |
|
char *av[]; |
318 |
|
{ |
319 |
< |
int p0[2], p1[2]; |
319 |
> |
int rval; |
320 |
|
|
321 |
< |
if (pipe(p0) < 0 || pipe(p1) < 0) { |
321 |
> |
rval = open_process(rt_pd, av); |
322 |
> |
if (rval < 0) { |
323 |
|
perror(progname); |
324 |
|
exit(1); |
325 |
|
} |
326 |
< |
if ((rt_pid = vfork()) == 0) { /* if child */ |
327 |
< |
close(p0[1]); |
282 |
< |
close(p1[0]); |
283 |
< |
if (p0[0] != 0) { /* connect p0 to stdin */ |
284 |
< |
dup2(p0[0], 0); |
285 |
< |
close(p0[0]); |
286 |
< |
} |
287 |
< |
if (p1[1] != 0) { /* connect p1 to stdout */ |
288 |
< |
dup2(p1[1], 1); |
289 |
< |
close(p1[1]); |
290 |
< |
} |
291 |
< |
execvp(av[0], av); |
292 |
< |
perror(av[0]); |
293 |
< |
_exit(127); |
294 |
< |
} |
295 |
< |
if (rt_pid == -1) { |
296 |
< |
perror(progname); |
326 |
> |
if (rval == 0) { |
327 |
> |
fprintf(stderr, "%s: command not found\n", av[0]); |
328 |
|
exit(1); |
329 |
|
} |
330 |
< |
close(p0[0]); |
331 |
< |
close(p1[1]); |
332 |
< |
fd_tort = p0[1]; |
333 |
< |
fd_fromrt = p1[0]; |
330 |
> |
maxpix = rval/(6*sizeof(float)); |
331 |
> |
if (maxpix > MAXPIX) |
332 |
> |
maxpix = MAXPIX; |
333 |
> |
maxpix--; |
334 |
|
} |
335 |
|
|
336 |
|
|
337 |
|
done_rtrace() /* wait for rtrace to finish */ |
338 |
|
{ |
339 |
< |
int pid, status; |
339 |
> |
int status; |
340 |
|
|
341 |
< |
if (rt_pid == -1) |
342 |
< |
return; |
312 |
< |
close(fd_tort); |
313 |
< |
close(fd_fromrt); |
314 |
< |
while ((pid = wait(&status)) != -1 && pid != rt_pid) |
315 |
< |
; |
316 |
< |
if (pid == rt_pid && status != 0) { |
341 |
> |
status = close_process(rt_pd); |
342 |
> |
if (status > 0) { |
343 |
|
fprintf(stderr, "%s: bad status (%d) from rtrace\n", |
344 |
|
progname, status); |
345 |
|
exit(1); |
346 |
|
} |
347 |
< |
rt_pid = -1; |
347 |
> |
rt_pd[0] = -1; |
348 |
|
} |
349 |
|
|
350 |
|
|
351 |
< |
int |
352 |
< |
readbuf(fd, bpos, siz) |
327 |
< |
int fd; |
328 |
< |
char *bpos; |
329 |
< |
int siz; |
351 |
> |
SCAN * |
352 |
> |
scanretire() /* retire old scanlines to free list */ |
353 |
|
{ |
354 |
< |
register int cc, nrem = siz; |
355 |
< |
|
356 |
< |
while (nrem > 0 && (cc = read(fd, bpos, nrem)) > 0) { |
357 |
< |
bpos += cc; |
358 |
< |
nrem -= cc; |
354 |
> |
SCAN *sold[NRETIRE]; |
355 |
> |
int n; |
356 |
> |
int h; |
357 |
> |
register SCAN *sl; |
358 |
> |
register int i; |
359 |
> |
/* grab the NRETIRE oldest scanlines */ |
360 |
> |
sold[n = 0] = NULL; |
361 |
> |
for (h = 0; h < HSIZE; h++) |
362 |
> |
for (sl = hashtab[h]; sl != NULL; sl = sl->next) { |
363 |
> |
for (i = n; i && sold[i-1]->lused > sl->lused; i--) |
364 |
> |
if (i < NRETIRE) |
365 |
> |
sold[i] = sold[i-1]; |
366 |
> |
if (i < NRETIRE) { |
367 |
> |
sold[i] = sl; |
368 |
> |
if (n < NRETIRE) /* grow list */ |
369 |
> |
n++; |
370 |
> |
} |
371 |
> |
} |
372 |
> |
/* put scanlines into free list */ |
373 |
> |
for (i = 0; i < n; i++) { |
374 |
> |
h = shash(sold[i]->y); |
375 |
> |
sl = hashtab[h]; |
376 |
> |
if (sl == sold[i]) |
377 |
> |
hashtab[h] = sl->next; |
378 |
> |
else { |
379 |
> |
while (sl->next != sold[i]) /* IS in list */ |
380 |
> |
sl = sl->next; |
381 |
> |
sl->next = sold[i]->next; |
382 |
> |
} |
383 |
> |
if (i > 0) { /* save oldest as return value */ |
384 |
> |
sold[i]->next = freelist; |
385 |
> |
freelist = sold[i]; |
386 |
> |
} |
387 |
|
} |
388 |
< |
if (cc < 0) |
338 |
< |
return(cc); |
339 |
< |
return(siz-nrem); |
388 |
> |
return(sold[0]); |
389 |
|
} |
390 |
|
|
391 |
|
|
392 |
< |
int |
344 |
< |
writebuf(fd, bpos, siz) |
345 |
< |
char *bpos; |
346 |
< |
int siz; |
347 |
< |
{ |
348 |
< |
register int cc, nrem = siz; |
392 |
> |
static char *scan_buf; |
393 |
|
|
394 |
< |
while (nrem > 0 && (cc = write(fd, bpos, nrem)) > 0) { |
395 |
< |
bpos += cc; |
396 |
< |
nrem -= cc; |
394 |
> |
|
395 |
> |
initscans() /* initialize scanline buffers */ |
396 |
> |
{ |
397 |
> |
int scansize; |
398 |
> |
register SCAN *ptr; |
399 |
> |
register int i; |
400 |
> |
/* initialize positions */ |
401 |
> |
scanpos = (long *)malloc(pysiz*sizeof(long)); |
402 |
> |
if (scanpos == NULL) |
403 |
> |
memerr("scanline positions"); |
404 |
> |
for (i = pysiz-1; i >= 0; i--) |
405 |
> |
scanpos[i] = -1L; |
406 |
> |
curpos = pysiz-1; |
407 |
> |
/* clear hash table */ |
408 |
> |
for (i = 0; i < HSIZE; i++) |
409 |
> |
hashtab[i] = NULL; |
410 |
> |
/* allocate scanline buffers */ |
411 |
> |
scansize = sizeof(SCAN) + pxsiz*sizeof(COLR); |
412 |
> |
#ifdef ALIGN |
413 |
> |
scansize = scansize+(sizeof(ALIGN)-1) & ~(sizeof(ALIGN)-1); |
414 |
> |
#endif |
415 |
> |
i = MAXSBUF / scansize; /* compute number to allocate */ |
416 |
> |
if (i > HSIZE) |
417 |
> |
i = HSIZE; |
418 |
> |
scan_buf = malloc(i*scansize); /* get in one big chunk */ |
419 |
> |
if (scan_buf == NULL) |
420 |
> |
memerr("scanline buffers"); |
421 |
> |
ptr = (SCAN *)scan_buf; |
422 |
> |
freelist = NULL; /* build our free list */ |
423 |
> |
while (i-- > 0) { |
424 |
> |
ptr->y = -1; |
425 |
> |
ptr->lused = -1; |
426 |
> |
ptr->next = freelist; |
427 |
> |
freelist = ptr; |
428 |
> |
ptr = (SCAN *)((char *)ptr + scansize); /* beware of C bugs */ |
429 |
|
} |
430 |
< |
if (cc < 0) |
431 |
< |
return(cc); |
432 |
< |
return(siz-nrem); |
430 |
> |
} |
431 |
> |
|
432 |
> |
|
433 |
> |
donescans() /* free up scanlines */ |
434 |
> |
{ |
435 |
> |
free(scan_buf); |
436 |
> |
free((char *)scanpos); |
437 |
|
} |