1 |
greg |
1.1 |
/* Copyright (c) 1991 Regents of the University of California */ |
2 |
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#ifndef lint |
4 |
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static char SCCSid[] = "$SunId$ LBL"; |
5 |
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#endif |
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7 |
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/* |
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* Compute pixels for glare calculation |
9 |
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*/ |
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#include "glare.h" |
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#include <sys/param.h> |
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/* compute rtrace buffer size */ |
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#ifndef PIPE_BUF |
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#define PIPE_BUF 512 /* hyperconservative */ |
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#endif |
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#define MAXPIX (PIPE_BUF/(6*sizeof(float)) - 1) |
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#ifndef BSD |
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#define vfork fork |
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#endif |
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23 |
greg |
1.3 |
#define NSCANS 64 /* number of scanlines to buffer */ |
24 |
greg |
1.1 |
|
25 |
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int rt_pid = -1; /* process id for rtrace */ |
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int fd_tort, fd_fromrt; /* pipe descriptors */ |
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28 |
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FILE *pictfp = NULL; /* picture file pointer */ |
29 |
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double exposure; /* picture exposure */ |
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int pxsiz, pysiz; /* picture dimensions */ |
31 |
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int curpos; /* current scanline */ |
32 |
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long *scanpos; /* scanline positions */ |
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struct { |
34 |
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long lused; /* for LRU replacement */ |
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int y; /* scanline position */ |
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COLR *sl; /* scanline contents */ |
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} scan[NSCANS]; /* buffered scanlines */ |
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39 |
greg |
1.2 |
static long ncall = 0L; /* number of calls to getpictscan */ |
40 |
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static long nread = 0L; /* number of scanlines read */ |
41 |
greg |
1.1 |
|
42 |
greg |
1.5 |
extern long ftell(); |
43 |
greg |
1.2 |
|
44 |
greg |
1.5 |
|
45 |
greg |
1.1 |
COLR * |
46 |
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getpictscan(y) /* get picture scanline */ |
47 |
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int y; |
48 |
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{ |
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int minused; |
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register int i; |
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/* first check our buffers */ |
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ncall++; |
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minused = 0; |
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for (i = 0; i < NSCANS; i++) { |
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if (scan[i].y == y) { |
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scan[i].lused = ncall; |
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return(scan[i].sl); |
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} |
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if (scan[i].lused < scan[minused].lused) |
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minused = i; |
61 |
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} |
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/* not there, read it in */ |
63 |
greg |
1.5 |
if (scanpos[y] < 0) { /* need to search */ |
64 |
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for (i = y+1; i < curpos; i++) |
65 |
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if (scanpos[i] >= 0) { |
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if (fseek(pictfp, scanpos[i], 0) < 0) |
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goto seekerr; |
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curpos = i; |
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break; |
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} |
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while (curpos >= y) { |
72 |
greg |
1.1 |
scanpos[curpos] = ftell(pictfp); |
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if (freadcolrs(scan[minused].sl, pxsiz, pictfp) < 0) |
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goto readerr; |
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greg |
1.5 |
nread++; |
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greg |
1.1 |
curpos--; |
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} |
78 |
greg |
1.5 |
} else { |
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if (curpos != y && fseek(pictfp, scanpos[y], 0) < 0) |
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goto seekerr; |
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if (freadcolrs(scan[minused].sl, pxsiz, pictfp) < 0) |
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goto readerr; |
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nread++; |
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curpos = y-1; |
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greg |
1.1 |
} |
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scan[minused].lused = ncall; |
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scan[minused].y = y; |
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return(scan[minused].sl); |
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readerr: |
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fprintf(stderr, "%s: picture read error\n", progname); |
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exit(1); |
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greg |
1.5 |
seekerr: |
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fprintf(stderr, "%s: picture seek error\n", progname); |
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exit(1); |
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greg |
1.1 |
} |
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greg |
1.2 |
pict_stats() /* print out picture read statistics */ |
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{ |
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static long lastcall = 0L; /* ncall at last report */ |
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static long lastread = 0L; /* nread at last report */ |
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if (ncall == lastcall) |
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return; |
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fprintf(stderr, "%s: %ld scanlines read, %ld reused\n", |
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progname, nread-lastread, |
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(ncall-lastcall)-(nread-lastread)); |
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lastcall = ncall; |
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lastread = nread; |
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} |
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greg |
1.1 |
double |
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pict_val(vd) /* find picture value for view direction */ |
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FVECT vd; |
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{ |
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FVECT pp; |
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double vpx, vpy, vpz; |
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COLOR res; |
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if (pictfp == NULL) |
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return(-1.0); |
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pp[0] = pictview.vp[0] + vd[0]; |
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pp[1] = pictview.vp[1] + vd[1]; |
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pp[2] = pictview.vp[2] + vd[2]; |
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viewpixel(&vpx, &vpy, &vpz, &pictview, pp); |
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if (vpz <= FTINY || vpx < 0. || vpx >= 1. || vpy < 0. || vpy >= 1.) |
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return(-1.0); |
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colr_color(res, getpictscan((int)(vpy*pysiz))[(int)(vpx*pxsiz)]); |
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return(luminance(res)/exposure); |
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} |
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double |
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getviewpix(vh, vv) /* compute single view pixel */ |
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int vh, vv; |
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{ |
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FVECT dir; |
139 |
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float rt_buf[6]; |
140 |
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double res; |
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142 |
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if (compdir(dir, vh, vv) < 0) |
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return(-1.0); |
144 |
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if ((res = pict_val(dir)) >= 0.0) |
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return(res); |
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if (rt_pid == -1) |
147 |
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return(-1.0); |
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rt_buf[0] = ourview.vp[0]; |
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rt_buf[1] = ourview.vp[1]; |
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rt_buf[2] = ourview.vp[2]; |
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rt_buf[3] = dir[0]; |
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rt_buf[4] = dir[1]; |
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rt_buf[5] = dir[2]; |
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rt_compute(rt_buf, 1); |
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return(luminance(rt_buf)); |
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} |
157 |
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158 |
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159 |
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getviewspan(vv, vb) /* compute a span of view pixels */ |
160 |
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int vv; |
161 |
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float *vb; |
162 |
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{ |
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float rt_buf[6*MAXPIX]; /* rtrace send/receive buffer */ |
164 |
greg |
1.3 |
register int n; /* number of pixels in buffer */ |
165 |
greg |
1.1 |
short buf_vh[MAXPIX]; /* pixel positions */ |
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FVECT dir; |
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register int vh; |
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169 |
greg |
1.4 |
#ifdef DEBUG |
170 |
greg |
1.1 |
if (verbose) |
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fprintf(stderr, "%s: computing view span at %d...\n", |
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progname, vv); |
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greg |
1.4 |
#endif |
174 |
greg |
1.3 |
n = 0; |
175 |
greg |
1.1 |
for (vh = -hsize; vh <= hsize; vh++) { |
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if (compdir(dir, vh, vv) < 0) { /* off viewable region */ |
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vb[vh+hsize] = -1.0; |
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continue; |
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} |
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if ((vb[vh+hsize] = pict_val(dir)) >= 0.0) |
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continue; |
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if (rt_pid == -1) /* missing information */ |
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continue; |
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/* send to rtrace */ |
185 |
greg |
1.3 |
if (n >= MAXPIX) { /* flush */ |
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rt_compute(rt_buf, n); |
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while (n-- > 0) |
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vb[buf_vh[n]+hsize] = luminance(rt_buf+3*n); |
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greg |
1.1 |
} |
190 |
greg |
1.3 |
rt_buf[6*n] = ourview.vp[0]; |
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rt_buf[6*n+1] = ourview.vp[1]; |
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rt_buf[6*n+2] = ourview.vp[2]; |
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rt_buf[6*n+3] = dir[0]; |
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rt_buf[6*n+4] = dir[1]; |
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rt_buf[6*n+5] = dir[2]; |
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buf_vh[n++] = vh; |
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greg |
1.1 |
} |
198 |
greg |
1.4 |
#ifdef DEBUG |
199 |
greg |
1.2 |
if (verbose) |
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pict_stats(); |
201 |
greg |
1.4 |
#endif |
202 |
greg |
1.3 |
if (n > 0) { /* process pending buffer */ |
203 |
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rt_compute(rt_buf, n); |
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while (n-- > 0) |
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vb[buf_vh[n]+hsize] = luminance(rt_buf+3*n); |
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} |
207 |
greg |
1.1 |
} |
208 |
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210 |
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rt_compute(pb, np) /* process buffer through rtrace */ |
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float *pb; |
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int np; |
213 |
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{ |
214 |
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static float nbuf[6] = {0.,0.,0.,0.,0.,0.}; |
215 |
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216 |
greg |
1.4 |
#ifdef DEBUG |
217 |
greg |
1.1 |
if (verbose && np > 1) |
218 |
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fprintf(stderr, "%s: sending %d samples to rtrace...\n", |
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progname, np); |
220 |
greg |
1.4 |
#endif |
221 |
greg |
1.1 |
if (writebuf(fd_tort,(char *)pb,6*sizeof(float)*np) < 6*sizeof(float)*np |
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|| writebuf(fd_tort,(char *)nbuf,sizeof(nbuf)) < sizeof(nbuf)) { |
223 |
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fprintf(stderr, "%s: error writing to rtrace process\n", |
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progname); |
225 |
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exit(1); |
226 |
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} |
227 |
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if (readbuf(fd_fromrt, (char *)pb, 3*sizeof(float)*np) |
228 |
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< 3*sizeof(float)*np) { |
229 |
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fprintf(stderr, "%s: error reading from rtrace process\n", |
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progname); |
231 |
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exit(1); |
232 |
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} |
233 |
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} |
234 |
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235 |
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236 |
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getexpos(s) /* get exposure from header line */ |
237 |
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char *s; |
238 |
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{ |
239 |
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if (isexpos(s)) |
240 |
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exposure *= exposval(s); |
241 |
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} |
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243 |
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244 |
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open_pict(fn) /* open picture file */ |
245 |
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char *fn; |
246 |
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{ |
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register int i; |
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if ((pictfp = fopen(fn, "r")) == NULL) { |
250 |
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fprintf("%s: cannot open\n", fn); |
251 |
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exit(1); |
252 |
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} |
253 |
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exposure = 1.0; |
254 |
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getheader(pictfp, getexpos); |
255 |
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if (fgetresolu(&pxsiz, &pysiz, pictfp) != (YMAJOR|YDECR)) { |
256 |
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fprintf("%s: bad picture resolution\n", fn); |
257 |
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exit(1); |
258 |
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} |
259 |
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scanpos = (long *)malloc(pysiz*sizeof(long)); |
260 |
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if (scanpos == NULL) |
261 |
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memerr("scanline positions"); |
262 |
greg |
1.5 |
for (i = pysiz-1; i >= 0; i--) |
263 |
greg |
1.1 |
scanpos[i] = -1L; |
264 |
greg |
1.5 |
curpos = pysiz-1; |
265 |
greg |
1.1 |
for (i = 0; i < NSCANS; i++) { |
266 |
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scan[i].lused = -1; |
267 |
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scan[i].y = -1; |
268 |
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scan[i].sl = (COLR *)malloc(pxsiz*sizeof(COLR)); |
269 |
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if (scan[i].sl == NULL) |
270 |
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memerr("scanline buffers"); |
271 |
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} |
272 |
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} |
273 |
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274 |
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275 |
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close_pict() /* done with picture */ |
276 |
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{ |
277 |
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register int i; |
278 |
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279 |
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if (pictfp == NULL) |
280 |
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return; |
281 |
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fclose(pictfp); |
282 |
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free((char *)scanpos); |
283 |
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for (i = 0; i < NSCANS; i++) |
284 |
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free((char *)scan[i].sl); |
285 |
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pictfp = NULL; |
286 |
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} |
287 |
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288 |
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289 |
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fork_rtrace(av) /* open pipe and start rtrace */ |
290 |
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char *av[]; |
291 |
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{ |
292 |
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int p0[2], p1[2]; |
293 |
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294 |
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if (pipe(p0) < 0 || pipe(p1) < 0) { |
295 |
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perror(progname); |
296 |
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exit(1); |
297 |
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} |
298 |
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if ((rt_pid = vfork()) == 0) { /* if child */ |
299 |
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close(p0[1]); |
300 |
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close(p1[0]); |
301 |
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if (p0[0] != 0) { /* connect p0 to stdin */ |
302 |
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dup2(p0[0], 0); |
303 |
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close(p0[0]); |
304 |
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} |
305 |
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if (p1[1] != 0) { /* connect p1 to stdout */ |
306 |
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dup2(p1[1], 1); |
307 |
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close(p1[1]); |
308 |
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} |
309 |
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execvp(av[0], av); |
310 |
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perror(av[0]); |
311 |
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_exit(127); |
312 |
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} |
313 |
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if (rt_pid == -1) { |
314 |
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perror(progname); |
315 |
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exit(1); |
316 |
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} |
317 |
greg |
1.3 |
close(p0[0]); |
318 |
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close(p1[1]); |
319 |
greg |
1.1 |
fd_tort = p0[1]; |
320 |
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fd_fromrt = p1[0]; |
321 |
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} |
322 |
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323 |
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324 |
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done_rtrace() /* wait for rtrace to finish */ |
325 |
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{ |
326 |
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int pid, status; |
327 |
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328 |
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if (rt_pid == -1) |
329 |
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return; |
330 |
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close(fd_tort); |
331 |
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close(fd_fromrt); |
332 |
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while ((pid = wait(&status)) != -1 && pid != rt_pid) |
333 |
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; |
334 |
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if (pid == rt_pid && status != 0) { |
335 |
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fprintf(stderr, "%s: bad status (%d) from rtrace\n", |
336 |
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progname, status); |
337 |
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exit(1); |
338 |
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} |
339 |
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rt_pid = -1; |
340 |
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} |
341 |
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342 |
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343 |
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int |
344 |
|
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readbuf(fd, bpos, siz) |
345 |
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int fd; |
346 |
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char *bpos; |
347 |
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int siz; |
348 |
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{ |
349 |
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register int cc, nrem = siz; |
350 |
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351 |
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while (nrem > 0 && (cc = read(fd, bpos, nrem)) > 0) { |
352 |
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bpos += cc; |
353 |
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nrem -= cc; |
354 |
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} |
355 |
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if (cc < 0) |
356 |
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return(cc); |
357 |
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return(siz-nrem); |
358 |
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} |
359 |
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360 |
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361 |
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int |
362 |
|
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writebuf(fd, bpos, siz) |
363 |
|
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char *bpos; |
364 |
|
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int siz; |
365 |
|
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{ |
366 |
|
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register int cc, nrem = siz; |
367 |
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368 |
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while (nrem > 0 && (cc = write(fd, bpos, nrem)) > 0) { |
369 |
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bpos += cc; |
370 |
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nrem -= cc; |
371 |
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} |
372 |
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if (cc < 0) |
373 |
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return(cc); |
374 |
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return(siz-nrem); |
375 |
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} |