1 |
greg |
1.1 |
#ifndef lint |
2 |
greg |
2.14 |
static const char RCSid[] = "$Id: glareval.c,v 2.13 2010/12/02 18:08:11 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 |
schorsch |
2.10 |
#include <stdlib.h> |
11 |
schorsch |
2.9 |
#include <string.h> |
12 |
|
|
|
13 |
greg |
2.13 |
#include "platform.h" |
14 |
schorsch |
2.7 |
#include "rtprocess.h" /* Windows: must come first because of conflicts */ |
15 |
greg |
1.1 |
#include "glare.h" |
16 |
schorsch |
2.7 |
|
17 |
greg |
1.19 |
/* maximum rtrace buffer size */ |
18 |
|
|
#define MAXPIX (4096/(6*sizeof(float))) |
19 |
greg |
1.1 |
|
20 |
greg |
1.16 |
#define MAXSBUF 786432 /* maximum total size of scanline buffer */ |
21 |
greg |
1.9 |
#define HSIZE 317 /* size of scanline hash table */ |
22 |
greg |
1.8 |
#define NRETIRE 16 /* number of scanlines to retire at once */ |
23 |
greg |
1.1 |
|
24 |
schorsch |
2.7 |
static SUBPROC rt_pd = SP_INACTIVE; /* process id & descriptors for rtrace */ |
25 |
greg |
1.1 |
|
26 |
|
|
FILE *pictfp = NULL; /* picture file pointer */ |
27 |
|
|
double exposure; /* picture exposure */ |
28 |
|
|
int pxsiz, pysiz; /* picture dimensions */ |
29 |
greg |
1.8 |
|
30 |
|
|
static int curpos; /* current scanline */ |
31 |
|
|
static long *scanpos; /* scanline positions */ |
32 |
|
|
|
33 |
|
|
typedef struct scan { |
34 |
|
|
int y; /* scanline position */ |
35 |
greg |
1.1 |
long lused; /* for LRU replacement */ |
36 |
greg |
1.8 |
struct scan *next; /* next in this hash or free list */ |
37 |
|
|
/* followed by the scanline data */ |
38 |
|
|
} SCAN; /* buffered scanline */ |
39 |
greg |
1.1 |
|
40 |
greg |
1.8 |
#define scandata(sl) ((COLR *)((sl)+1)) |
41 |
|
|
#define shash(y) ((y)%HSIZE) |
42 |
|
|
|
43 |
greg |
1.19 |
static int maxpix; /* maximum number of pixels to buffer */ |
44 |
|
|
|
45 |
greg |
1.8 |
static SCAN *freelist; /* scanline free list */ |
46 |
|
|
static SCAN *hashtab[HSIZE]; /* scanline hash table */ |
47 |
|
|
|
48 |
greg |
2.2 |
static long scanbufsiz; /* size of allocated scanline buffer */ |
49 |
|
|
|
50 |
greg |
1.2 |
static long ncall = 0L; /* number of calls to getpictscan */ |
51 |
|
|
static long nread = 0L; /* number of scanlines read */ |
52 |
greg |
1.15 |
static long nrecl = 0L; /* number of scanlines reclaimed */ |
53 |
greg |
1.1 |
|
54 |
greg |
1.13 |
static int wrongformat = 0; |
55 |
|
|
|
56 |
schorsch |
2.11 |
static SCAN * claimscan(int y); |
57 |
|
|
static COLR * getpictscan(int y); |
58 |
|
|
static double pict_val(FVECT vd); |
59 |
|
|
static void rt_compute(float *pb, int np); |
60 |
|
|
static gethfunc getexpos; |
61 |
|
|
static SCAN * scanretire(void); |
62 |
|
|
static void initscans(void); |
63 |
|
|
static void donescans(void); |
64 |
greg |
1.8 |
|
65 |
greg |
1.2 |
|
66 |
schorsch |
2.11 |
static SCAN * |
67 |
|
|
claimscan( /* claim scanline from buffers */ |
68 |
|
|
int y |
69 |
|
|
) |
70 |
greg |
1.8 |
{ |
71 |
|
|
int hi = shash(y); |
72 |
|
|
SCAN *slast; |
73 |
|
|
register SCAN *sl; |
74 |
|
|
|
75 |
|
|
for (sl = hashtab[hi]; sl != NULL; sl = sl->next) |
76 |
|
|
if (sl->y == y) /* active scanline */ |
77 |
|
|
return(sl); |
78 |
|
|
for (slast = NULL, sl = freelist; sl != NULL; slast = sl, sl = sl->next) |
79 |
|
|
if (sl->y == -1 || sl->y == y || sl->next == NULL) { |
80 |
|
|
if (slast == NULL) /* remove from free */ |
81 |
|
|
freelist = sl->next; |
82 |
|
|
else |
83 |
|
|
slast->next = sl->next; |
84 |
|
|
if (sl->y == y) { /* reclaim */ |
85 |
|
|
sl->next = hashtab[hi]; |
86 |
|
|
hashtab[hi] = sl; |
87 |
greg |
1.15 |
nrecl++; |
88 |
greg |
1.8 |
} |
89 |
|
|
return(sl); |
90 |
|
|
} |
91 |
|
|
return(scanretire()); /* need more free scanlines */ |
92 |
|
|
} |
93 |
|
|
|
94 |
|
|
|
95 |
schorsch |
2.11 |
static COLR * |
96 |
|
|
getpictscan( /* get picture scanline */ |
97 |
|
|
int y |
98 |
|
|
) |
99 |
greg |
1.1 |
{ |
100 |
greg |
1.8 |
register SCAN *sl; |
101 |
greg |
1.1 |
register int i; |
102 |
|
|
/* first check our buffers */ |
103 |
greg |
1.8 |
sl = claimscan(y); |
104 |
|
|
if (sl == NULL) |
105 |
|
|
memerr("claimscan()"); |
106 |
|
|
sl->lused = ncall++; |
107 |
|
|
if (sl->y == y) /* scan hit */ |
108 |
|
|
return(scandata(sl)); |
109 |
|
|
/* else read in replacement */ |
110 |
greg |
1.5 |
if (scanpos[y] < 0) { /* need to search */ |
111 |
|
|
for (i = y+1; i < curpos; i++) |
112 |
|
|
if (scanpos[i] >= 0) { |
113 |
|
|
if (fseek(pictfp, scanpos[i], 0) < 0) |
114 |
|
|
goto seekerr; |
115 |
|
|
curpos = i; |
116 |
|
|
break; |
117 |
|
|
} |
118 |
|
|
while (curpos >= y) { |
119 |
greg |
1.1 |
scanpos[curpos] = ftell(pictfp); |
120 |
greg |
1.8 |
if (freadcolrs(scandata(sl), pxsiz, pictfp) < 0) |
121 |
greg |
1.1 |
goto readerr; |
122 |
greg |
1.5 |
nread++; |
123 |
greg |
1.1 |
curpos--; |
124 |
|
|
} |
125 |
greg |
1.5 |
} else { |
126 |
|
|
if (curpos != y && fseek(pictfp, scanpos[y], 0) < 0) |
127 |
|
|
goto seekerr; |
128 |
greg |
1.8 |
if (freadcolrs(scandata(sl), pxsiz, pictfp) < 0) |
129 |
greg |
1.5 |
goto readerr; |
130 |
|
|
nread++; |
131 |
|
|
curpos = y-1; |
132 |
greg |
1.1 |
} |
133 |
greg |
1.8 |
sl->y = y; |
134 |
|
|
i = shash(y); /* add to hash list */ |
135 |
|
|
sl->next = hashtab[i]; |
136 |
|
|
hashtab[i] = sl; |
137 |
|
|
return(scandata(sl)); |
138 |
greg |
1.1 |
readerr: |
139 |
|
|
fprintf(stderr, "%s: picture read error\n", progname); |
140 |
|
|
exit(1); |
141 |
greg |
1.5 |
seekerr: |
142 |
|
|
fprintf(stderr, "%s: picture seek error\n", progname); |
143 |
|
|
exit(1); |
144 |
greg |
1.1 |
} |
145 |
|
|
|
146 |
|
|
|
147 |
greg |
1.6 |
#ifdef DEBUG |
148 |
greg |
2.12 |
void |
149 |
schorsch |
2.11 |
pict_stats(void) /* print out picture read statistics */ |
150 |
greg |
1.2 |
{ |
151 |
|
|
static long lastcall = 0L; /* ncall at last report */ |
152 |
|
|
static long lastread = 0L; /* nread at last report */ |
153 |
greg |
1.15 |
static long lastrecl = 0L; /* nrecl at last report */ |
154 |
greg |
1.2 |
|
155 |
|
|
if (ncall == lastcall) |
156 |
|
|
return; |
157 |
greg |
1.15 |
fprintf(stderr, "%s: %ld scanlines read (%ld reclaimed) in %ld calls\n", |
158 |
|
|
progname, nread-lastread, nrecl-lastrecl, ncall-lastcall); |
159 |
greg |
1.2 |
lastcall = ncall; |
160 |
|
|
lastread = nread; |
161 |
greg |
1.15 |
lastrecl = nrecl; |
162 |
greg |
1.2 |
} |
163 |
greg |
1.6 |
#endif |
164 |
greg |
1.2 |
|
165 |
|
|
|
166 |
schorsch |
2.11 |
static double |
167 |
|
|
pict_val( /* find picture value for view direction */ |
168 |
|
|
FVECT vd |
169 |
|
|
) |
170 |
greg |
1.1 |
{ |
171 |
|
|
FVECT pp; |
172 |
greg |
1.21 |
FVECT ip; |
173 |
greg |
1.1 |
COLOR res; |
174 |
|
|
|
175 |
|
|
if (pictfp == NULL) |
176 |
|
|
return(-1.0); |
177 |
|
|
pp[0] = pictview.vp[0] + vd[0]; |
178 |
|
|
pp[1] = pictview.vp[1] + vd[1]; |
179 |
|
|
pp[2] = pictview.vp[2] + vd[2]; |
180 |
greg |
1.21 |
viewloc(ip, &pictview, pp); |
181 |
|
|
if (ip[2] <= FTINY || ip[0] < 0. || ip[0] >= 1. || |
182 |
|
|
ip[1] < 0. || ip[1] >= 1.) |
183 |
greg |
1.1 |
return(-1.0); |
184 |
greg |
1.21 |
colr_color(res, getpictscan((int)(ip[1]*pysiz))[(int)(ip[0]*pxsiz)]); |
185 |
greg |
1.1 |
return(luminance(res)/exposure); |
186 |
|
|
} |
187 |
|
|
|
188 |
|
|
|
189 |
schorsch |
2.11 |
extern double |
190 |
|
|
getviewpix( /* compute single view pixel */ |
191 |
|
|
int vh, |
192 |
|
|
int vv |
193 |
|
|
) |
194 |
greg |
1.1 |
{ |
195 |
|
|
FVECT dir; |
196 |
greg |
1.19 |
float rt_buf[12]; |
197 |
greg |
1.1 |
double res; |
198 |
|
|
|
199 |
greg |
1.14 |
if (compdir(dir, vh, vv) < 0) |
200 |
greg |
1.1 |
return(-1.0); |
201 |
greg |
1.7 |
npixinvw++; |
202 |
greg |
1.1 |
if ((res = pict_val(dir)) >= 0.0) |
203 |
|
|
return(res); |
204 |
schorsch |
2.7 |
if (rt_pd.r == -1) { |
205 |
greg |
1.7 |
npixmiss++; |
206 |
greg |
1.1 |
return(-1.0); |
207 |
greg |
1.7 |
} |
208 |
greg |
1.1 |
rt_buf[0] = ourview.vp[0]; |
209 |
|
|
rt_buf[1] = ourview.vp[1]; |
210 |
|
|
rt_buf[2] = ourview.vp[2]; |
211 |
|
|
rt_buf[3] = dir[0]; |
212 |
|
|
rt_buf[4] = dir[1]; |
213 |
|
|
rt_buf[5] = dir[2]; |
214 |
|
|
rt_compute(rt_buf, 1); |
215 |
|
|
return(luminance(rt_buf)); |
216 |
|
|
} |
217 |
|
|
|
218 |
|
|
|
219 |
schorsch |
2.11 |
extern void |
220 |
|
|
getviewspan( /* compute a span of view pixels */ |
221 |
|
|
int vv, |
222 |
|
|
float *vb |
223 |
|
|
) |
224 |
greg |
1.1 |
{ |
225 |
|
|
float rt_buf[6*MAXPIX]; /* rtrace send/receive buffer */ |
226 |
greg |
1.3 |
register int n; /* number of pixels in buffer */ |
227 |
greg |
1.1 |
short buf_vh[MAXPIX]; /* pixel positions */ |
228 |
|
|
FVECT dir; |
229 |
|
|
register int vh; |
230 |
|
|
|
231 |
greg |
1.4 |
#ifdef DEBUG |
232 |
greg |
1.1 |
if (verbose) |
233 |
|
|
fprintf(stderr, "%s: computing view span at %d...\n", |
234 |
|
|
progname, vv); |
235 |
greg |
1.4 |
#endif |
236 |
greg |
1.3 |
n = 0; |
237 |
greg |
1.1 |
for (vh = -hsize; vh <= hsize; vh++) { |
238 |
greg |
1.14 |
if (compdir(dir, vh, vv) < 0) { /* not in view */ |
239 |
greg |
1.1 |
vb[vh+hsize] = -1.0; |
240 |
|
|
continue; |
241 |
|
|
} |
242 |
greg |
1.7 |
npixinvw++; |
243 |
greg |
1.1 |
if ((vb[vh+hsize] = pict_val(dir)) >= 0.0) |
244 |
|
|
continue; |
245 |
schorsch |
2.7 |
if (rt_pd.r == -1) { /* missing information */ |
246 |
greg |
1.7 |
npixmiss++; |
247 |
greg |
1.1 |
continue; |
248 |
greg |
1.7 |
} |
249 |
greg |
1.1 |
/* send to rtrace */ |
250 |
greg |
1.19 |
if (n >= maxpix) { /* flush */ |
251 |
greg |
1.3 |
rt_compute(rt_buf, n); |
252 |
greg |
2.14 |
while (n > 0) { |
253 |
|
|
--n; |
254 |
greg |
1.3 |
vb[buf_vh[n]+hsize] = luminance(rt_buf+3*n); |
255 |
greg |
2.14 |
} |
256 |
greg |
1.1 |
} |
257 |
greg |
1.3 |
rt_buf[6*n] = ourview.vp[0]; |
258 |
|
|
rt_buf[6*n+1] = ourview.vp[1]; |
259 |
|
|
rt_buf[6*n+2] = ourview.vp[2]; |
260 |
|
|
rt_buf[6*n+3] = dir[0]; |
261 |
|
|
rt_buf[6*n+4] = dir[1]; |
262 |
|
|
rt_buf[6*n+5] = dir[2]; |
263 |
|
|
buf_vh[n++] = vh; |
264 |
greg |
1.1 |
} |
265 |
greg |
1.4 |
#ifdef DEBUG |
266 |
greg |
1.2 |
if (verbose) |
267 |
|
|
pict_stats(); |
268 |
greg |
1.4 |
#endif |
269 |
greg |
1.3 |
if (n > 0) { /* process pending buffer */ |
270 |
|
|
rt_compute(rt_buf, n); |
271 |
|
|
while (n-- > 0) |
272 |
|
|
vb[buf_vh[n]+hsize] = luminance(rt_buf+3*n); |
273 |
|
|
} |
274 |
greg |
1.1 |
} |
275 |
|
|
|
276 |
|
|
|
277 |
schorsch |
2.11 |
static void |
278 |
|
|
rt_compute( /* process buffer through rtrace */ |
279 |
|
|
float *pb, |
280 |
|
|
int np |
281 |
|
|
) |
282 |
greg |
1.1 |
{ |
283 |
greg |
1.4 |
#ifdef DEBUG |
284 |
greg |
1.1 |
if (verbose && np > 1) |
285 |
|
|
fprintf(stderr, "%s: sending %d samples to rtrace...\n", |
286 |
|
|
progname, np); |
287 |
greg |
1.4 |
#endif |
288 |
schorsch |
2.9 |
memset(pb+6*np, '\0', 6*sizeof(float)); |
289 |
schorsch |
2.7 |
if (process(&rt_pd, (char *)pb, (char *)pb, 3*sizeof(float)*(np+1), |
290 |
gregl |
2.4 |
6*sizeof(float)*(np+1)) < 3*sizeof(float)*(np+1)) { |
291 |
greg |
1.19 |
fprintf(stderr, "%s: rtrace communication error\n", |
292 |
greg |
1.1 |
progname); |
293 |
|
|
exit(1); |
294 |
|
|
} |
295 |
|
|
} |
296 |
|
|
|
297 |
|
|
|
298 |
schorsch |
2.11 |
static int |
299 |
|
|
getexpos( /* get exposure from header line */ |
300 |
|
|
char *s, |
301 |
|
|
void *p |
302 |
|
|
) |
303 |
greg |
1.1 |
{ |
304 |
greg |
1.13 |
char fmt[32]; |
305 |
|
|
|
306 |
greg |
1.1 |
if (isexpos(s)) |
307 |
|
|
exposure *= exposval(s); |
308 |
greg |
1.13 |
else if (isformat(s)) { |
309 |
|
|
formatval(fmt, s); |
310 |
|
|
wrongformat = strcmp(fmt, COLRFMT); |
311 |
|
|
} |
312 |
gwlarson |
2.5 |
return(0); |
313 |
greg |
1.1 |
} |
314 |
|
|
|
315 |
|
|
|
316 |
schorsch |
2.11 |
extern void |
317 |
|
|
open_pict( /* open picture file */ |
318 |
|
|
char *fn |
319 |
|
|
) |
320 |
greg |
1.1 |
{ |
321 |
|
|
if ((pictfp = fopen(fn, "r")) == NULL) { |
322 |
greg |
2.3 |
fprintf(stderr, "%s: cannot open\n", fn); |
323 |
greg |
1.1 |
exit(1); |
324 |
|
|
} |
325 |
greg |
2.13 |
SET_FILE_BINARY(pictfp); |
326 |
greg |
1.1 |
exposure = 1.0; |
327 |
greg |
1.13 |
getheader(pictfp, getexpos, NULL); |
328 |
greg |
1.21 |
if (wrongformat || !fscnresolu(&pxsiz, &pysiz, pictfp)) { |
329 |
|
|
fprintf(stderr, "%s: incompatible picture format\n", fn); |
330 |
greg |
1.1 |
exit(1); |
331 |
|
|
} |
332 |
greg |
1.8 |
initscans(); |
333 |
greg |
1.1 |
} |
334 |
|
|
|
335 |
|
|
|
336 |
schorsch |
2.11 |
extern void |
337 |
|
|
close_pict(void) /* done with picture */ |
338 |
greg |
1.1 |
{ |
339 |
|
|
if (pictfp == NULL) |
340 |
|
|
return; |
341 |
|
|
fclose(pictfp); |
342 |
greg |
1.8 |
donescans(); |
343 |
greg |
1.1 |
pictfp = NULL; |
344 |
|
|
} |
345 |
|
|
|
346 |
|
|
|
347 |
schorsch |
2.11 |
extern void |
348 |
|
|
fork_rtrace( /* open pipe and start rtrace */ |
349 |
|
|
char *av[] |
350 |
|
|
) |
351 |
greg |
1.1 |
{ |
352 |
greg |
1.19 |
int rval; |
353 |
greg |
1.1 |
|
354 |
schorsch |
2.7 |
rval = open_process(&rt_pd, av); |
355 |
greg |
1.19 |
if (rval < 0) { |
356 |
greg |
1.1 |
perror(progname); |
357 |
|
|
exit(1); |
358 |
|
|
} |
359 |
greg |
1.19 |
if (rval == 0) { |
360 |
|
|
fprintf(stderr, "%s: command not found\n", av[0]); |
361 |
greg |
1.1 |
exit(1); |
362 |
|
|
} |
363 |
greg |
1.19 |
maxpix = rval/(6*sizeof(float)); |
364 |
|
|
if (maxpix > MAXPIX) |
365 |
|
|
maxpix = MAXPIX; |
366 |
|
|
maxpix--; |
367 |
greg |
1.1 |
} |
368 |
|
|
|
369 |
|
|
|
370 |
schorsch |
2.11 |
extern void |
371 |
|
|
done_rtrace(void) /* wait for rtrace to finish */ |
372 |
greg |
1.1 |
{ |
373 |
greg |
1.19 |
int status; |
374 |
greg |
1.1 |
|
375 |
schorsch |
2.7 |
status = close_process(&rt_pd); |
376 |
greg |
1.19 |
if (status > 0) { |
377 |
greg |
1.1 |
fprintf(stderr, "%s: bad status (%d) from rtrace\n", |
378 |
|
|
progname, status); |
379 |
|
|
exit(1); |
380 |
|
|
} |
381 |
schorsch |
2.7 |
rt_pd.r = -1; |
382 |
greg |
1.8 |
} |
383 |
|
|
|
384 |
|
|
|
385 |
schorsch |
2.11 |
static SCAN * |
386 |
|
|
scanretire(void) /* retire old scanlines to free list */ |
387 |
greg |
1.8 |
{ |
388 |
|
|
SCAN *sold[NRETIRE]; |
389 |
|
|
int n; |
390 |
|
|
int h; |
391 |
|
|
register SCAN *sl; |
392 |
|
|
register int i; |
393 |
|
|
/* grab the NRETIRE oldest scanlines */ |
394 |
|
|
sold[n = 0] = NULL; |
395 |
greg |
1.10 |
for (h = 0; h < HSIZE; h++) |
396 |
|
|
for (sl = hashtab[h]; sl != NULL; sl = sl->next) { |
397 |
|
|
for (i = n; i && sold[i-1]->lused > sl->lused; i--) |
398 |
|
|
if (i < NRETIRE) |
399 |
greg |
1.8 |
sold[i] = sold[i-1]; |
400 |
|
|
if (i < NRETIRE) { |
401 |
greg |
1.10 |
sold[i] = sl; |
402 |
greg |
1.8 |
if (n < NRETIRE) /* grow list */ |
403 |
|
|
n++; |
404 |
greg |
1.10 |
} |
405 |
|
|
} |
406 |
|
|
/* put scanlines into free list */ |
407 |
|
|
for (i = 0; i < n; i++) { |
408 |
|
|
h = shash(sold[i]->y); |
409 |
|
|
sl = hashtab[h]; |
410 |
|
|
if (sl == sold[i]) |
411 |
|
|
hashtab[h] = sl->next; |
412 |
|
|
else { |
413 |
|
|
while (sl->next != sold[i]) /* IS in list */ |
414 |
greg |
1.8 |
sl = sl->next; |
415 |
greg |
1.10 |
sl->next = sold[i]->next; |
416 |
greg |
1.8 |
} |
417 |
greg |
1.10 |
if (i > 0) { /* save oldest as return value */ |
418 |
|
|
sold[i]->next = freelist; |
419 |
|
|
freelist = sold[i]; |
420 |
|
|
} |
421 |
greg |
1.8 |
} |
422 |
|
|
return(sold[0]); |
423 |
|
|
} |
424 |
|
|
|
425 |
|
|
|
426 |
|
|
static char *scan_buf; |
427 |
|
|
|
428 |
|
|
|
429 |
schorsch |
2.11 |
static void |
430 |
|
|
initscans(void) /* initialize scanline buffers */ |
431 |
greg |
1.8 |
{ |
432 |
|
|
int scansize; |
433 |
|
|
register SCAN *ptr; |
434 |
|
|
register int i; |
435 |
|
|
/* initialize positions */ |
436 |
greg |
2.2 |
scanpos = (long *)bmalloc(pysiz*sizeof(long)); |
437 |
greg |
1.8 |
if (scanpos == NULL) |
438 |
|
|
memerr("scanline positions"); |
439 |
|
|
for (i = pysiz-1; i >= 0; i--) |
440 |
|
|
scanpos[i] = -1L; |
441 |
|
|
curpos = pysiz-1; |
442 |
|
|
/* clear hash table */ |
443 |
|
|
for (i = 0; i < HSIZE; i++) |
444 |
|
|
hashtab[i] = NULL; |
445 |
|
|
/* allocate scanline buffers */ |
446 |
|
|
scansize = sizeof(SCAN) + pxsiz*sizeof(COLR); |
447 |
greg |
2.8 |
#ifdef ALIGNT |
448 |
|
|
scansize = scansize+(sizeof(ALIGNT)-1) & ~(sizeof(ALIGNT)-1); |
449 |
greg |
1.8 |
#endif |
450 |
|
|
i = MAXSBUF / scansize; /* compute number to allocate */ |
451 |
|
|
if (i > HSIZE) |
452 |
|
|
i = HSIZE; |
453 |
greg |
2.2 |
scanbufsiz = i*scansize; |
454 |
|
|
scan_buf = bmalloc(scanbufsiz); /* get in one big chunk */ |
455 |
greg |
1.8 |
if (scan_buf == NULL) |
456 |
|
|
memerr("scanline buffers"); |
457 |
|
|
ptr = (SCAN *)scan_buf; |
458 |
|
|
freelist = NULL; /* build our free list */ |
459 |
|
|
while (i-- > 0) { |
460 |
|
|
ptr->y = -1; |
461 |
|
|
ptr->lused = -1; |
462 |
|
|
ptr->next = freelist; |
463 |
|
|
freelist = ptr; |
464 |
|
|
ptr = (SCAN *)((char *)ptr + scansize); /* beware of C bugs */ |
465 |
|
|
} |
466 |
|
|
} |
467 |
|
|
|
468 |
|
|
|
469 |
schorsch |
2.11 |
static void |
470 |
|
|
donescans(void) /* free up scanlines */ |
471 |
greg |
1.8 |
{ |
472 |
greg |
2.2 |
bfree(scan_buf, scanbufsiz); |
473 |
|
|
bfree((char *)scanpos, pysiz*sizeof(long)); |
474 |
greg |
1.1 |
} |