1 |
greg |
1.1 |
/* Copyright (c) 1991 Regents of the University of California */ |
2 |
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3 |
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#ifndef lint |
4 |
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static char SCCSid[] = "$SunId$ LBL"; |
5 |
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#endif |
6 |
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7 |
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/* |
8 |
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* Compute pixels for glare calculation |
9 |
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*/ |
10 |
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11 |
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#include "glare.h" |
12 |
greg |
1.19 |
/* maximum rtrace buffer size */ |
13 |
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#define MAXPIX (4096/(6*sizeof(float))) |
14 |
greg |
1.1 |
|
15 |
greg |
1.16 |
#define MAXSBUF 786432 /* maximum total size of scanline buffer */ |
16 |
greg |
1.9 |
#define HSIZE 317 /* size of scanline hash table */ |
17 |
greg |
1.8 |
#define NRETIRE 16 /* number of scanlines to retire at once */ |
18 |
greg |
1.1 |
|
19 |
greg |
1.19 |
int rt_pd[3] = {-1,-1,-1}; /* process id & descriptors for rtrace */ |
20 |
greg |
1.1 |
|
21 |
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FILE *pictfp = NULL; /* picture file pointer */ |
22 |
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double exposure; /* picture exposure */ |
23 |
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int pxsiz, pysiz; /* picture dimensions */ |
24 |
greg |
1.8 |
|
25 |
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static int curpos; /* current scanline */ |
26 |
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static long *scanpos; /* scanline positions */ |
27 |
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28 |
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typedef struct scan { |
29 |
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int y; /* scanline position */ |
30 |
greg |
1.1 |
long lused; /* for LRU replacement */ |
31 |
greg |
1.8 |
struct scan *next; /* next in this hash or free list */ |
32 |
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/* followed by the scanline data */ |
33 |
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} SCAN; /* buffered scanline */ |
34 |
greg |
1.1 |
|
35 |
greg |
1.8 |
#define scandata(sl) ((COLR *)((sl)+1)) |
36 |
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#define shash(y) ((y)%HSIZE) |
37 |
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|
38 |
greg |
1.19 |
static int maxpix; /* maximum number of pixels to buffer */ |
39 |
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40 |
greg |
1.8 |
static SCAN *freelist; /* scanline free list */ |
41 |
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static SCAN *hashtab[HSIZE]; /* scanline hash table */ |
42 |
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43 |
greg |
1.2 |
static long ncall = 0L; /* number of calls to getpictscan */ |
44 |
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static long nread = 0L; /* number of scanlines read */ |
45 |
greg |
1.15 |
static long nrecl = 0L; /* number of scanlines reclaimed */ |
46 |
greg |
1.1 |
|
47 |
greg |
1.13 |
static int wrongformat = 0; |
48 |
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|
49 |
greg |
1.8 |
SCAN *scanretire(); |
50 |
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|
51 |
greg |
1.5 |
extern long ftell(); |
52 |
greg |
1.2 |
|
53 |
greg |
1.5 |
|
54 |
greg |
1.8 |
SCAN * |
55 |
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claimscan(y) /* claim scanline from buffers */ |
56 |
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int y; |
57 |
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{ |
58 |
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int hi = shash(y); |
59 |
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SCAN *slast; |
60 |
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register SCAN *sl; |
61 |
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62 |
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for (sl = hashtab[hi]; sl != NULL; sl = sl->next) |
63 |
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if (sl->y == y) /* active scanline */ |
64 |
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return(sl); |
65 |
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for (slast = NULL, sl = freelist; sl != NULL; slast = sl, sl = sl->next) |
66 |
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if (sl->y == -1 || sl->y == y || sl->next == NULL) { |
67 |
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if (slast == NULL) /* remove from free */ |
68 |
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freelist = sl->next; |
69 |
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else |
70 |
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slast->next = sl->next; |
71 |
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if (sl->y == y) { /* reclaim */ |
72 |
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sl->next = hashtab[hi]; |
73 |
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hashtab[hi] = sl; |
74 |
greg |
1.15 |
nrecl++; |
75 |
greg |
1.8 |
} |
76 |
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return(sl); |
77 |
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} |
78 |
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return(scanretire()); /* need more free scanlines */ |
79 |
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} |
80 |
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81 |
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82 |
greg |
1.1 |
COLR * |
83 |
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getpictscan(y) /* get picture scanline */ |
84 |
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int y; |
85 |
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{ |
86 |
greg |
1.8 |
register SCAN *sl; |
87 |
greg |
1.1 |
register int i; |
88 |
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/* first check our buffers */ |
89 |
greg |
1.8 |
sl = claimscan(y); |
90 |
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if (sl == NULL) |
91 |
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memerr("claimscan()"); |
92 |
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sl->lused = ncall++; |
93 |
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if (sl->y == y) /* scan hit */ |
94 |
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return(scandata(sl)); |
95 |
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/* else read in replacement */ |
96 |
greg |
1.5 |
if (scanpos[y] < 0) { /* need to search */ |
97 |
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for (i = y+1; i < curpos; i++) |
98 |
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if (scanpos[i] >= 0) { |
99 |
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if (fseek(pictfp, scanpos[i], 0) < 0) |
100 |
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goto seekerr; |
101 |
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curpos = i; |
102 |
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break; |
103 |
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} |
104 |
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while (curpos >= y) { |
105 |
greg |
1.1 |
scanpos[curpos] = ftell(pictfp); |
106 |
greg |
1.8 |
if (freadcolrs(scandata(sl), pxsiz, pictfp) < 0) |
107 |
greg |
1.1 |
goto readerr; |
108 |
greg |
1.5 |
nread++; |
109 |
greg |
1.1 |
curpos--; |
110 |
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} |
111 |
greg |
1.5 |
} else { |
112 |
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if (curpos != y && fseek(pictfp, scanpos[y], 0) < 0) |
113 |
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goto seekerr; |
114 |
greg |
1.8 |
if (freadcolrs(scandata(sl), pxsiz, pictfp) < 0) |
115 |
greg |
1.5 |
goto readerr; |
116 |
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nread++; |
117 |
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curpos = y-1; |
118 |
greg |
1.1 |
} |
119 |
greg |
1.8 |
sl->y = y; |
120 |
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i = shash(y); /* add to hash list */ |
121 |
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sl->next = hashtab[i]; |
122 |
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hashtab[i] = sl; |
123 |
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return(scandata(sl)); |
124 |
greg |
1.1 |
readerr: |
125 |
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fprintf(stderr, "%s: picture read error\n", progname); |
126 |
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exit(1); |
127 |
greg |
1.5 |
seekerr: |
128 |
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fprintf(stderr, "%s: picture seek error\n", progname); |
129 |
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exit(1); |
130 |
greg |
1.1 |
} |
131 |
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132 |
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133 |
greg |
1.6 |
#ifdef DEBUG |
134 |
greg |
1.2 |
pict_stats() /* print out picture read statistics */ |
135 |
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{ |
136 |
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static long lastcall = 0L; /* ncall at last report */ |
137 |
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static long lastread = 0L; /* nread at last report */ |
138 |
greg |
1.15 |
static long lastrecl = 0L; /* nrecl at last report */ |
139 |
greg |
1.2 |
|
140 |
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if (ncall == lastcall) |
141 |
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return; |
142 |
greg |
1.15 |
fprintf(stderr, "%s: %ld scanlines read (%ld reclaimed) in %ld calls\n", |
143 |
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progname, nread-lastread, nrecl-lastrecl, ncall-lastcall); |
144 |
greg |
1.2 |
lastcall = ncall; |
145 |
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lastread = nread; |
146 |
greg |
1.15 |
lastrecl = nrecl; |
147 |
greg |
1.2 |
} |
148 |
greg |
1.6 |
#endif |
149 |
greg |
1.2 |
|
150 |
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|
151 |
greg |
1.1 |
double |
152 |
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pict_val(vd) /* find picture value for view direction */ |
153 |
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FVECT vd; |
154 |
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{ |
155 |
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FVECT pp; |
156 |
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double vpx, vpy, vpz; |
157 |
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COLOR res; |
158 |
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159 |
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if (pictfp == NULL) |
160 |
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return(-1.0); |
161 |
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pp[0] = pictview.vp[0] + vd[0]; |
162 |
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pp[1] = pictview.vp[1] + vd[1]; |
163 |
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pp[2] = pictview.vp[2] + vd[2]; |
164 |
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viewpixel(&vpx, &vpy, &vpz, &pictview, pp); |
165 |
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if (vpz <= FTINY || vpx < 0. || vpx >= 1. || vpy < 0. || vpy >= 1.) |
166 |
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return(-1.0); |
167 |
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colr_color(res, getpictscan((int)(vpy*pysiz))[(int)(vpx*pxsiz)]); |
168 |
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return(luminance(res)/exposure); |
169 |
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} |
170 |
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171 |
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172 |
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double |
173 |
greg |
1.14 |
getviewpix(vh, vv) /* compute single view pixel */ |
174 |
greg |
1.1 |
int vh, vv; |
175 |
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{ |
176 |
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FVECT dir; |
177 |
greg |
1.19 |
float rt_buf[12]; |
178 |
greg |
1.1 |
double res; |
179 |
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|
180 |
greg |
1.14 |
if (compdir(dir, vh, vv) < 0) |
181 |
greg |
1.1 |
return(-1.0); |
182 |
greg |
1.7 |
npixinvw++; |
183 |
greg |
1.1 |
if ((res = pict_val(dir)) >= 0.0) |
184 |
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return(res); |
185 |
greg |
1.19 |
if (rt_pd[0] == -1) { |
186 |
greg |
1.7 |
npixmiss++; |
187 |
greg |
1.1 |
return(-1.0); |
188 |
greg |
1.7 |
} |
189 |
greg |
1.1 |
rt_buf[0] = ourview.vp[0]; |
190 |
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rt_buf[1] = ourview.vp[1]; |
191 |
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rt_buf[2] = ourview.vp[2]; |
192 |
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rt_buf[3] = dir[0]; |
193 |
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rt_buf[4] = dir[1]; |
194 |
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rt_buf[5] = dir[2]; |
195 |
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rt_compute(rt_buf, 1); |
196 |
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return(luminance(rt_buf)); |
197 |
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} |
198 |
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199 |
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200 |
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getviewspan(vv, vb) /* compute a span of view pixels */ |
201 |
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int vv; |
202 |
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float *vb; |
203 |
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{ |
204 |
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float rt_buf[6*MAXPIX]; /* rtrace send/receive buffer */ |
205 |
greg |
1.3 |
register int n; /* number of pixels in buffer */ |
206 |
greg |
1.1 |
short buf_vh[MAXPIX]; /* pixel positions */ |
207 |
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FVECT dir; |
208 |
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register int vh; |
209 |
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210 |
greg |
1.4 |
#ifdef DEBUG |
211 |
greg |
1.1 |
if (verbose) |
212 |
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fprintf(stderr, "%s: computing view span at %d...\n", |
213 |
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progname, vv); |
214 |
greg |
1.4 |
#endif |
215 |
greg |
1.3 |
n = 0; |
216 |
greg |
1.1 |
for (vh = -hsize; vh <= hsize; vh++) { |
217 |
greg |
1.14 |
if (compdir(dir, vh, vv) < 0) { /* not in view */ |
218 |
greg |
1.1 |
vb[vh+hsize] = -1.0; |
219 |
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continue; |
220 |
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} |
221 |
greg |
1.7 |
npixinvw++; |
222 |
greg |
1.1 |
if ((vb[vh+hsize] = pict_val(dir)) >= 0.0) |
223 |
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continue; |
224 |
greg |
1.19 |
if (rt_pd[0] == -1) { /* missing information */ |
225 |
greg |
1.7 |
npixmiss++; |
226 |
greg |
1.1 |
continue; |
227 |
greg |
1.7 |
} |
228 |
greg |
1.1 |
/* send to rtrace */ |
229 |
greg |
1.19 |
if (n >= maxpix) { /* flush */ |
230 |
greg |
1.3 |
rt_compute(rt_buf, n); |
231 |
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while (n-- > 0) |
232 |
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vb[buf_vh[n]+hsize] = luminance(rt_buf+3*n); |
233 |
greg |
1.1 |
} |
234 |
greg |
1.3 |
rt_buf[6*n] = ourview.vp[0]; |
235 |
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rt_buf[6*n+1] = ourview.vp[1]; |
236 |
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rt_buf[6*n+2] = ourview.vp[2]; |
237 |
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rt_buf[6*n+3] = dir[0]; |
238 |
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rt_buf[6*n+4] = dir[1]; |
239 |
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rt_buf[6*n+5] = dir[2]; |
240 |
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buf_vh[n++] = vh; |
241 |
greg |
1.1 |
} |
242 |
greg |
1.4 |
#ifdef DEBUG |
243 |
greg |
1.2 |
if (verbose) |
244 |
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pict_stats(); |
245 |
greg |
1.4 |
#endif |
246 |
greg |
1.3 |
if (n > 0) { /* process pending buffer */ |
247 |
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rt_compute(rt_buf, n); |
248 |
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while (n-- > 0) |
249 |
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vb[buf_vh[n]+hsize] = luminance(rt_buf+3*n); |
250 |
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} |
251 |
greg |
1.1 |
} |
252 |
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253 |
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254 |
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rt_compute(pb, np) /* process buffer through rtrace */ |
255 |
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float *pb; |
256 |
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int np; |
257 |
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{ |
258 |
greg |
1.4 |
#ifdef DEBUG |
259 |
greg |
1.1 |
if (verbose && np > 1) |
260 |
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fprintf(stderr, "%s: sending %d samples to rtrace...\n", |
261 |
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progname, np); |
262 |
greg |
1.4 |
#endif |
263 |
greg |
1.19 |
pb[6*np+3] = 0.; pb[6*np+4] = 0.; pb[6*np+5] = 0.; |
264 |
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if (process(rt_pd, pb, pb, 3*sizeof(float)*np, |
265 |
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6*sizeof(float)*(np+1)) < 3*sizeof(float)*np) { |
266 |
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fprintf(stderr, "%s: rtrace communication error\n", |
267 |
greg |
1.1 |
progname); |
268 |
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exit(1); |
269 |
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} |
270 |
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} |
271 |
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272 |
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273 |
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getexpos(s) /* get exposure from header line */ |
274 |
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char *s; |
275 |
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{ |
276 |
greg |
1.13 |
char fmt[32]; |
277 |
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|
278 |
greg |
1.1 |
if (isexpos(s)) |
279 |
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exposure *= exposval(s); |
280 |
greg |
1.13 |
else if (isformat(s)) { |
281 |
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formatval(fmt, s); |
282 |
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wrongformat = strcmp(fmt, COLRFMT); |
283 |
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} |
284 |
greg |
1.1 |
} |
285 |
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286 |
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287 |
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open_pict(fn) /* open picture file */ |
288 |
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char *fn; |
289 |
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{ |
290 |
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if ((pictfp = fopen(fn, "r")) == NULL) { |
291 |
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fprintf("%s: cannot open\n", fn); |
292 |
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exit(1); |
293 |
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} |
294 |
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exposure = 1.0; |
295 |
greg |
1.13 |
getheader(pictfp, getexpos, NULL); |
296 |
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if (wrongformat || |
297 |
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fgetresolu(&pxsiz, &pysiz, pictfp) != (YMAJOR|YDECR)) { |
298 |
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fprintf("%s: bad picture format\n", fn); |
299 |
greg |
1.1 |
exit(1); |
300 |
|
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} |
301 |
greg |
1.8 |
initscans(); |
302 |
greg |
1.1 |
} |
303 |
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|
304 |
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|
305 |
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close_pict() /* done with picture */ |
306 |
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{ |
307 |
|
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if (pictfp == NULL) |
308 |
|
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return; |
309 |
|
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fclose(pictfp); |
310 |
greg |
1.8 |
donescans(); |
311 |
greg |
1.1 |
pictfp = NULL; |
312 |
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} |
313 |
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314 |
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315 |
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fork_rtrace(av) /* open pipe and start rtrace */ |
316 |
|
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char *av[]; |
317 |
|
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{ |
318 |
greg |
1.19 |
int rval; |
319 |
greg |
1.1 |
|
320 |
greg |
1.19 |
rval = open_process(rt_pd, av); |
321 |
|
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if (rval < 0) { |
322 |
greg |
1.1 |
perror(progname); |
323 |
|
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exit(1); |
324 |
|
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} |
325 |
greg |
1.19 |
if (rval == 0) { |
326 |
|
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fprintf(stderr, "%s: command not found\n", av[0]); |
327 |
greg |
1.1 |
exit(1); |
328 |
|
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} |
329 |
greg |
1.19 |
maxpix = rval/(6*sizeof(float)); |
330 |
|
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if (maxpix > MAXPIX) |
331 |
|
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maxpix = MAXPIX; |
332 |
|
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maxpix--; |
333 |
greg |
1.1 |
} |
334 |
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|
335 |
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|
336 |
|
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done_rtrace() /* wait for rtrace to finish */ |
337 |
|
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{ |
338 |
greg |
1.19 |
int status; |
339 |
greg |
1.1 |
|
340 |
greg |
1.19 |
status = close_process(rt_pd); |
341 |
|
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if (status > 0) { |
342 |
greg |
1.1 |
fprintf(stderr, "%s: bad status (%d) from rtrace\n", |
343 |
|
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progname, status); |
344 |
|
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exit(1); |
345 |
|
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} |
346 |
greg |
1.19 |
rt_pd[0] = -1; |
347 |
greg |
1.8 |
} |
348 |
|
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|
349 |
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|
350 |
|
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SCAN * |
351 |
|
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scanretire() /* retire old scanlines to free list */ |
352 |
|
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{ |
353 |
|
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SCAN *sold[NRETIRE]; |
354 |
|
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int n; |
355 |
|
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int h; |
356 |
|
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register SCAN *sl; |
357 |
|
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register int i; |
358 |
|
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/* grab the NRETIRE oldest scanlines */ |
359 |
|
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sold[n = 0] = NULL; |
360 |
greg |
1.10 |
for (h = 0; h < HSIZE; h++) |
361 |
|
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for (sl = hashtab[h]; sl != NULL; sl = sl->next) { |
362 |
|
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for (i = n; i && sold[i-1]->lused > sl->lused; i--) |
363 |
|
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if (i < NRETIRE) |
364 |
greg |
1.8 |
sold[i] = sold[i-1]; |
365 |
|
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if (i < NRETIRE) { |
366 |
greg |
1.10 |
sold[i] = sl; |
367 |
greg |
1.8 |
if (n < NRETIRE) /* grow list */ |
368 |
|
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n++; |
369 |
greg |
1.10 |
} |
370 |
|
|
} |
371 |
|
|
/* put scanlines into free list */ |
372 |
|
|
for (i = 0; i < n; i++) { |
373 |
|
|
h = shash(sold[i]->y); |
374 |
|
|
sl = hashtab[h]; |
375 |
|
|
if (sl == sold[i]) |
376 |
|
|
hashtab[h] = sl->next; |
377 |
|
|
else { |
378 |
|
|
while (sl->next != sold[i]) /* IS in list */ |
379 |
greg |
1.8 |
sl = sl->next; |
380 |
greg |
1.10 |
sl->next = sold[i]->next; |
381 |
greg |
1.8 |
} |
382 |
greg |
1.10 |
if (i > 0) { /* save oldest as return value */ |
383 |
|
|
sold[i]->next = freelist; |
384 |
|
|
freelist = sold[i]; |
385 |
|
|
} |
386 |
greg |
1.8 |
} |
387 |
|
|
return(sold[0]); |
388 |
|
|
} |
389 |
|
|
|
390 |
|
|
|
391 |
|
|
static char *scan_buf; |
392 |
|
|
|
393 |
|
|
|
394 |
|
|
initscans() /* initialize scanline buffers */ |
395 |
|
|
{ |
396 |
|
|
int scansize; |
397 |
|
|
register SCAN *ptr; |
398 |
|
|
register int i; |
399 |
|
|
/* initialize positions */ |
400 |
|
|
scanpos = (long *)malloc(pysiz*sizeof(long)); |
401 |
|
|
if (scanpos == NULL) |
402 |
|
|
memerr("scanline positions"); |
403 |
|
|
for (i = pysiz-1; i >= 0; i--) |
404 |
|
|
scanpos[i] = -1L; |
405 |
|
|
curpos = pysiz-1; |
406 |
|
|
/* clear hash table */ |
407 |
|
|
for (i = 0; i < HSIZE; i++) |
408 |
|
|
hashtab[i] = NULL; |
409 |
|
|
/* allocate scanline buffers */ |
410 |
|
|
scansize = sizeof(SCAN) + pxsiz*sizeof(COLR); |
411 |
|
|
#ifdef ALIGN |
412 |
greg |
1.17 |
scansize = scansize+(sizeof(ALIGN)-1) & ~(sizeof(ALIGN)-1); |
413 |
greg |
1.8 |
#endif |
414 |
|
|
i = MAXSBUF / scansize; /* compute number to allocate */ |
415 |
|
|
if (i > HSIZE) |
416 |
|
|
i = HSIZE; |
417 |
|
|
scan_buf = malloc(i*scansize); /* get in one big chunk */ |
418 |
|
|
if (scan_buf == NULL) |
419 |
|
|
memerr("scanline buffers"); |
420 |
|
|
ptr = (SCAN *)scan_buf; |
421 |
|
|
freelist = NULL; /* build our free list */ |
422 |
|
|
while (i-- > 0) { |
423 |
|
|
ptr->y = -1; |
424 |
|
|
ptr->lused = -1; |
425 |
|
|
ptr->next = freelist; |
426 |
|
|
freelist = ptr; |
427 |
|
|
ptr = (SCAN *)((char *)ptr + scansize); /* beware of C bugs */ |
428 |
|
|
} |
429 |
|
|
} |
430 |
|
|
|
431 |
|
|
|
432 |
|
|
donescans() /* free up scanlines */ |
433 |
|
|
{ |
434 |
|
|
free(scan_buf); |
435 |
|
|
free((char *)scanpos); |
436 |
greg |
1.1 |
} |