| 1 |
/* Copyright (c) 1994 Regents of the University of California */ |
| 2 |
|
| 3 |
#ifndef lint |
| 4 |
static char SCCSid[] = "$SunId$ LBL"; |
| 5 |
#endif |
| 6 |
|
| 7 |
/* |
| 8 |
* Interpolate and extrapolate pictures with different view parameters. |
| 9 |
* |
| 10 |
* Greg Ward 09Dec89 |
| 11 |
*/ |
| 12 |
|
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#include "standard.h" |
| 14 |
|
| 15 |
#include <ctype.h> |
| 16 |
|
| 17 |
#include "view.h" |
| 18 |
|
| 19 |
#include "color.h" |
| 20 |
|
| 21 |
#include "resolu.h" |
| 22 |
|
| 23 |
#define pscan(y) (ourpict+(y)*hresolu) |
| 24 |
#define sscan(y) (ourspict+(y)*hresolu) |
| 25 |
#define wscan(y) (ourweigh+(y)*hresolu) |
| 26 |
#define zscan(y) (ourzbuf+(y)*hresolu) |
| 27 |
#define averaging (ourweigh != NULL) |
| 28 |
|
| 29 |
#define MAXWT 1000. /* maximum pixel weight (averaging) */ |
| 30 |
|
| 31 |
#define F_FORE 1 /* fill foreground */ |
| 32 |
#define F_BACK 2 /* fill background */ |
| 33 |
|
| 34 |
#define PACKSIZ 256 /* max. calculation packet size */ |
| 35 |
|
| 36 |
#define RTCOM "rtrace -h- -ovl -fff " |
| 37 |
|
| 38 |
#define ABS(x) ((x)>0?(x):-(x)) |
| 39 |
|
| 40 |
struct position {int x,y; float z;}; |
| 41 |
|
| 42 |
#define NSTEPS 64 /* number steps in overlap prescan */ |
| 43 |
#define MINSTEP 4 /* minimum worthwhile preview step */ |
| 44 |
|
| 45 |
struct bound {int min,max;}; |
| 46 |
|
| 47 |
VIEW ourview = STDVIEW; /* desired view */ |
| 48 |
int hresolu = 512; /* horizontal resolution */ |
| 49 |
int vresolu = 512; /* vertical resolution */ |
| 50 |
double pixaspect = 1.0; /* pixel aspect ratio */ |
| 51 |
|
| 52 |
double zeps = .02; /* allowed z epsilon */ |
| 53 |
|
| 54 |
COLR *ourpict; /* output picture (COLR's) */ |
| 55 |
COLOR *ourspict; /* output pixel sums (averaging) */ |
| 56 |
float *ourweigh = NULL; /* output pixel weights (averaging) */ |
| 57 |
float *ourzbuf; /* corresponding z-buffer */ |
| 58 |
|
| 59 |
char *progname; |
| 60 |
|
| 61 |
int fillo = F_FORE|F_BACK; /* selected fill options */ |
| 62 |
int fillsamp = 0; /* sample separation (0 == inf) */ |
| 63 |
extern int backfill(), rcalfill(); /* fill functions */ |
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int (*fillfunc)() = backfill; /* selected fill function */ |
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COLR backcolr = BLKCOLR; /* background color */ |
| 66 |
COLOR backcolor = BLKCOLOR; /* background color (float) */ |
| 67 |
double backz = 0.0; /* background z value */ |
| 68 |
int normdist = 1; /* normalized distance? */ |
| 69 |
double ourexp = -1; /* output picture exposure */ |
| 70 |
|
| 71 |
VIEW theirview = STDVIEW; /* input view */ |
| 72 |
int gotview; /* got input view? */ |
| 73 |
int wrongformat = 0; /* input in another format? */ |
| 74 |
RESOLU tresolu; /* input resolution */ |
| 75 |
double theirexp; /* input picture exposure */ |
| 76 |
MAT4 theirs2ours; /* transformation matrix */ |
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int hasmatrix = 0; /* has transformation matrix */ |
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|
| 79 |
int PDesc[3] = {-1,-1,-1}; /* rtrace process descriptor */ |
| 80 |
#define childpid (PDesc[2]) |
| 81 |
unsigned short queue[PACKSIZ][2]; /* pending pixels */ |
| 82 |
int packsiz; /* actual packet size */ |
| 83 |
int queuesiz; /* number of pixels pending */ |
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|
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extern double movepixel(); |
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|
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|
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main(argc, argv) /* interpolate pictures */ |
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int argc; |
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char *argv[]; |
| 91 |
{ |
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#define check(ol,al) if (argv[i][ol] || \ |
| 93 |
badarg(argc-i-1,argv+i+1,al)) \ |
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goto badopt |
| 95 |
int gotvfile = 0; |
| 96 |
int doavg = -1; |
| 97 |
char *zfile = NULL; |
| 98 |
char *err; |
| 99 |
int i, rval; |
| 100 |
|
| 101 |
progname = argv[0]; |
| 102 |
|
| 103 |
for (i = 1; i < argc && argv[i][0] == '-'; i++) { |
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rval = getviewopt(&ourview, argc-i, argv+i); |
| 105 |
if (rval >= 0) { |
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i += rval; |
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continue; |
| 108 |
} |
| 109 |
switch (argv[i][1]) { |
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case 't': /* threshold */ |
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check(2,"f"); |
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zeps = atof(argv[++i]); |
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break; |
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case 'a': /* average */ |
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check(2,NULL); |
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doavg = 1; |
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break; |
| 118 |
case 'q': /* quick (no avg.) */ |
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check(2,NULL); |
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doavg = 0; |
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break; |
| 122 |
case 'n': /* dist. normalized? */ |
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check(2,NULL); |
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normdist = !normdist; |
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break; |
| 126 |
case 'f': /* fill type */ |
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switch (argv[i][2]) { |
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case '0': /* none */ |
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check(3,NULL); |
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fillo = 0; |
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break; |
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case 'f': /* foreground */ |
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check(3,NULL); |
| 134 |
fillo = F_FORE; |
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break; |
| 136 |
case 'b': /* background */ |
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check(3,NULL); |
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fillo = F_BACK; |
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break; |
| 140 |
case 'a': /* all */ |
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check(3,NULL); |
| 142 |
fillo = F_FORE|F_BACK; |
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break; |
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case 's': /* sample */ |
| 145 |
check(3,"i"); |
| 146 |
fillsamp = atoi(argv[++i]); |
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break; |
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case 'c': /* color */ |
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check(3,"fff"); |
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fillfunc = backfill; |
| 151 |
setcolor(backcolor, atof(argv[i+1]), |
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atof(argv[i+2]), atof(argv[i+3])); |
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setcolr(backcolr, colval(backcolor,RED), |
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colval(backcolor,GRN), |
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colval(backcolor,BLU)); |
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i += 3; |
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break; |
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case 'z': /* z value */ |
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check(3,"f"); |
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fillfunc = backfill; |
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backz = atof(argv[++i]); |
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break; |
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case 'r': /* rtrace */ |
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check(3,"s"); |
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fillfunc = rcalfill; |
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calstart(RTCOM, argv[++i]); |
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break; |
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default: |
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goto badopt; |
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} |
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break; |
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case 'z': /* z file */ |
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check(2,"s"); |
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zfile = argv[++i]; |
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break; |
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case 'x': /* x resolution */ |
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check(2,"i"); |
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hresolu = atoi(argv[++i]); |
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break; |
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case 'y': /* y resolution */ |
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check(2,"i"); |
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vresolu = atoi(argv[++i]); |
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break; |
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case 'p': /* pixel aspect */ |
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if (argv[i][2] != 'a') |
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goto badopt; |
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check(3,"f"); |
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pixaspect = atof(argv[++i]); |
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break; |
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case 'v': /* view file */ |
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if (argv[i][2] != 'f') |
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goto badopt; |
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check(3,"s"); |
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gotvfile = viewfile(argv[++i], &ourview, 0, 0); |
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if (gotvfile < 0) |
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syserror(argv[i]); |
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else if (gotvfile == 0) { |
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fprintf(stderr, "%s: bad view file\n", |
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argv[i]); |
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exit(1); |
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} |
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break; |
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default: |
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badopt: |
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fprintf(stderr, "%s: command line error at '%s'\n", |
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progname, argv[i]); |
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goto userr; |
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} |
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} |
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/* check arguments */ |
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if ((argc-i)%2) |
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goto userr; |
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if (fillsamp == 1) |
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fillo &= ~F_BACK; |
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if (doavg < 0) |
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doavg = (argc-i) > 2; |
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/* set view */ |
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if ((err = setview(&ourview)) != NULL) { |
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fprintf(stderr, "%s: %s\n", progname, err); |
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exit(1); |
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} |
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normaspect(viewaspect(&ourview), &pixaspect, &hresolu, &vresolu); |
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/* allocate frame */ |
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if (doavg) { |
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ourspict = (COLOR *)bmalloc(hresolu*vresolu*sizeof(COLOR)); |
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ourweigh = (float *)bmalloc(hresolu*vresolu*sizeof(float)); |
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if (ourspict == NULL | ourweigh == NULL) |
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syserror(progname); |
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} else { |
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ourpict = (COLR *)bmalloc(hresolu*vresolu*sizeof(COLR)); |
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if (ourpict == NULL) |
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syserror(progname); |
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} |
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ourzbuf = (float *)bmalloc(hresolu*vresolu*sizeof(float)); |
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if (ourzbuf == NULL) |
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syserror(progname); |
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bzero((char *)ourzbuf, hresolu*vresolu*sizeof(float)); |
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/* new header */ |
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newheader("RADIANCE", stdout); |
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/* get input */ |
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for ( ; i < argc; i += 2) |
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addpicture(argv[i], argv[i+1]); |
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/* fill in spaces */ |
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if (fillo&F_BACK) |
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backpicture(fillfunc, fillsamp); |
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else |
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fillpicture(fillfunc); |
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/* close calculation */ |
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caldone(); |
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/* aft clipping */ |
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clipaft(); |
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/* add to header */ |
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printargs(argc, argv, stdout); |
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if (gotvfile) { |
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fputs(VIEWSTR, stdout); |
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fprintview(&ourview, stdout); |
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putc('\n', stdout); |
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} |
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if (pixaspect < .99 || pixaspect > 1.01) |
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fputaspect(pixaspect, stdout); |
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if (ourexp > 0 && (ourexp < .995 || ourexp > 1.005)) |
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fputexpos(ourexp, stdout); |
| 263 |
fputformat(COLRFMT, stdout); |
| 264 |
putc('\n', stdout); |
| 265 |
/* write picture */ |
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writepicture(); |
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/* write z file */ |
| 268 |
if (zfile != NULL) |
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writedistance(zfile); |
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|
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exit(0); |
| 272 |
userr: |
| 273 |
fprintf(stderr, |
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"Usage: %s [view opts][-t eps][-z zout][-fT][-n] pfile zspec ..\n", |
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progname); |
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exit(1); |
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#undef check |
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} |
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|
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|
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headline(s) /* process header string */ |
| 282 |
char *s; |
| 283 |
{ |
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char fmt[32]; |
| 285 |
|
| 286 |
if (isheadid(s)) |
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return; |
| 288 |
if (formatval(fmt, s)) { |
| 289 |
wrongformat = strcmp(fmt, COLRFMT); |
| 290 |
return; |
| 291 |
} |
| 292 |
putc('\t', stdout); |
| 293 |
fputs(s, stdout); |
| 294 |
|
| 295 |
if (isexpos(s)) { |
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theirexp *= exposval(s); |
| 297 |
return; |
| 298 |
} |
| 299 |
if (isview(s) && sscanview(&theirview, s) > 0) |
| 300 |
gotview++; |
| 301 |
} |
| 302 |
|
| 303 |
|
| 304 |
addpicture(pfile, zspec) /* add picture to output */ |
| 305 |
char *pfile, *zspec; |
| 306 |
{ |
| 307 |
FILE *pfp; |
| 308 |
int zfd; |
| 309 |
char *err; |
| 310 |
COLR *scanin; |
| 311 |
float *zin; |
| 312 |
struct position *plast; |
| 313 |
struct bound *xlim, ylim; |
| 314 |
int y; |
| 315 |
/* open picture file */ |
| 316 |
if ((pfp = fopen(pfile, "r")) == NULL) |
| 317 |
syserror(pfile); |
| 318 |
/* get header with exposure and view */ |
| 319 |
theirexp = 1.0; |
| 320 |
gotview = 0; |
| 321 |
printf("%s:\n", pfile); |
| 322 |
getheader(pfp, headline, NULL); |
| 323 |
if (wrongformat || !gotview || !fgetsresolu(&tresolu, pfp)) { |
| 324 |
fprintf(stderr, "%s: picture format error\n", pfile); |
| 325 |
exit(1); |
| 326 |
} |
| 327 |
if (ourexp <= 0) |
| 328 |
ourexp = theirexp; |
| 329 |
else if (ABS(theirexp-ourexp) > .01*ourexp) |
| 330 |
fprintf(stderr, "%s: different exposure (warning)\n", pfile); |
| 331 |
if (err = setview(&theirview)) { |
| 332 |
fprintf(stderr, "%s: %s\n", pfile, err); |
| 333 |
exit(1); |
| 334 |
} |
| 335 |
/* compute transformation */ |
| 336 |
hasmatrix = pixform(theirs2ours, &theirview, &ourview); |
| 337 |
/* get z specification or file */ |
| 338 |
zin = (float *)malloc(scanlen(&tresolu)*sizeof(float)); |
| 339 |
if (zin == NULL) |
| 340 |
syserror(progname); |
| 341 |
if ((zfd = open(zspec, O_RDONLY)) == -1) { |
| 342 |
double zvalue; |
| 343 |
register int x; |
| 344 |
if (!isflt(zspec) || (zvalue = atof(zspec)) <= 0.0) |
| 345 |
syserror(zspec); |
| 346 |
for (x = scanlen(&tresolu); x-- > 0; ) |
| 347 |
zin[x] = zvalue; |
| 348 |
} |
| 349 |
/* compute transferrable perimeter */ |
| 350 |
xlim = (struct bound *)malloc(numscans(&tresolu)*sizeof(struct bound)); |
| 351 |
if (xlim == NULL) |
| 352 |
syserror(progname); |
| 353 |
if (!getperim(xlim, &ylim, zin, zfd)) { /* overlapping area? */ |
| 354 |
free((char *)zin); |
| 355 |
free((char *)xlim); |
| 356 |
if (zfd != -1) |
| 357 |
close(zfd); |
| 358 |
fclose(pfp); |
| 359 |
return; |
| 360 |
} |
| 361 |
/* allocate scanlines */ |
| 362 |
scanin = (COLR *)malloc(scanlen(&tresolu)*sizeof(COLR)); |
| 363 |
plast = (struct position *)calloc(scanlen(&tresolu), |
| 364 |
sizeof(struct position)); |
| 365 |
if (scanin == NULL | plast == NULL) |
| 366 |
syserror(progname); |
| 367 |
/* skip to starting point */ |
| 368 |
for (y = 0; y < ylim.min; y++) |
| 369 |
if (freadcolrs(scanin, scanlen(&tresolu), pfp) < 0) { |
| 370 |
fprintf(stderr, "%s: read error\n", pfile); |
| 371 |
exit(1); |
| 372 |
} |
| 373 |
if (zfd != -1 && lseek(zfd, |
| 374 |
(long)ylim.min*scanlen(&tresolu)*sizeof(float), 0) < 0) |
| 375 |
syserror(zspec); |
| 376 |
/* load image */ |
| 377 |
for (y = ylim.min; y <= ylim.max; y++) { |
| 378 |
if (freadcolrs(scanin, scanlen(&tresolu), pfp) < 0) { |
| 379 |
fprintf(stderr, "%s: read error\n", pfile); |
| 380 |
exit(1); |
| 381 |
} |
| 382 |
if (zfd != -1 && read(zfd, (char *)zin, |
| 383 |
scanlen(&tresolu)*sizeof(float)) |
| 384 |
< scanlen(&tresolu)*sizeof(float)) |
| 385 |
syserror(zspec); |
| 386 |
addscanline(xlim+y, y, scanin, zin, plast); |
| 387 |
} |
| 388 |
/* clean up */ |
| 389 |
free((char *)xlim); |
| 390 |
free((char *)scanin); |
| 391 |
free((char *)zin); |
| 392 |
free((char *)plast); |
| 393 |
fclose(pfp); |
| 394 |
if (zfd != -1) |
| 395 |
close(zfd); |
| 396 |
} |
| 397 |
|
| 398 |
|
| 399 |
pixform(xfmat, vw1, vw2) /* compute view1 to view2 matrix */ |
| 400 |
register MAT4 xfmat; |
| 401 |
register VIEW *vw1, *vw2; |
| 402 |
{ |
| 403 |
double m4t[4][4]; |
| 404 |
|
| 405 |
if (vw1->type != VT_PER && vw1->type != VT_PAR) |
| 406 |
return(0); |
| 407 |
if (vw2->type != VT_PER && vw2->type != VT_PAR) |
| 408 |
return(0); |
| 409 |
setident4(xfmat); |
| 410 |
xfmat[0][0] = vw1->hvec[0]; |
| 411 |
xfmat[0][1] = vw1->hvec[1]; |
| 412 |
xfmat[0][2] = vw1->hvec[2]; |
| 413 |
xfmat[1][0] = vw1->vvec[0]; |
| 414 |
xfmat[1][1] = vw1->vvec[1]; |
| 415 |
xfmat[1][2] = vw1->vvec[2]; |
| 416 |
xfmat[2][0] = vw1->vdir[0]; |
| 417 |
xfmat[2][1] = vw1->vdir[1]; |
| 418 |
xfmat[2][2] = vw1->vdir[2]; |
| 419 |
xfmat[3][0] = vw1->vp[0]; |
| 420 |
xfmat[3][1] = vw1->vp[1]; |
| 421 |
xfmat[3][2] = vw1->vp[2]; |
| 422 |
setident4(m4t); |
| 423 |
m4t[0][0] = vw2->hvec[0]/vw2->hn2; |
| 424 |
m4t[1][0] = vw2->hvec[1]/vw2->hn2; |
| 425 |
m4t[2][0] = vw2->hvec[2]/vw2->hn2; |
| 426 |
m4t[3][0] = -DOT(vw2->vp,vw2->hvec)/vw2->hn2; |
| 427 |
m4t[0][1] = vw2->vvec[0]/vw2->vn2; |
| 428 |
m4t[1][1] = vw2->vvec[1]/vw2->vn2; |
| 429 |
m4t[2][1] = vw2->vvec[2]/vw2->vn2; |
| 430 |
m4t[3][1] = -DOT(vw2->vp,vw2->vvec)/vw2->vn2; |
| 431 |
m4t[0][2] = vw2->vdir[0]; |
| 432 |
m4t[1][2] = vw2->vdir[1]; |
| 433 |
m4t[2][2] = vw2->vdir[2]; |
| 434 |
m4t[3][2] = -DOT(vw2->vp,vw2->vdir); |
| 435 |
multmat4(xfmat, xfmat, m4t); |
| 436 |
return(1); |
| 437 |
} |
| 438 |
|
| 439 |
|
| 440 |
addscanline(xl, y, pline, zline, lasty) /* add scanline to output */ |
| 441 |
struct bound *xl; |
| 442 |
int y; |
| 443 |
COLR *pline; |
| 444 |
float *zline; |
| 445 |
struct position *lasty; /* input/output */ |
| 446 |
{ |
| 447 |
FVECT pos; |
| 448 |
struct position lastx, newpos; |
| 449 |
double wt; |
| 450 |
register int x; |
| 451 |
|
| 452 |
lastx.z = 0; |
| 453 |
for (x = xl->max; x >= xl->min; x--) { |
| 454 |
pix2loc(pos, &tresolu, x, y); |
| 455 |
pos[2] = zline[x]; |
| 456 |
if ((wt = movepixel(pos)) <= FTINY) { |
| 457 |
lasty[x].z = lastx.z = 0; /* mark invalid */ |
| 458 |
continue; |
| 459 |
} |
| 460 |
/* add pixel to our image */ |
| 461 |
newpos.x = pos[0] * hresolu; |
| 462 |
newpos.y = pos[1] * vresolu; |
| 463 |
newpos.z = zline[x]; |
| 464 |
addpixel(&newpos, &lastx, &lasty[x], pline[x], wt, pos[2]); |
| 465 |
lasty[x].x = lastx.x = newpos.x; |
| 466 |
lasty[x].y = lastx.y = newpos.y; |
| 467 |
lasty[x].z = lastx.z = newpos.z; |
| 468 |
} |
| 469 |
} |
| 470 |
|
| 471 |
|
| 472 |
addpixel(p0, p1, p2, pix, w, z) /* fill in pixel parallelogram */ |
| 473 |
struct position *p0, *p1, *p2; |
| 474 |
COLR pix; |
| 475 |
double w; |
| 476 |
double z; |
| 477 |
{ |
| 478 |
double zt = 2.*zeps*p0->z; /* threshold */ |
| 479 |
COLOR pval; /* converted+weighted pixel */ |
| 480 |
int s1x, s1y, s2x, s2y; /* step sizes */ |
| 481 |
int l1, l2, c1, c2; /* side lengths and counters */ |
| 482 |
int p1isy; /* p0p1 along y? */ |
| 483 |
int x1, y1; /* p1 position */ |
| 484 |
register int x, y; /* final position */ |
| 485 |
|
| 486 |
/* compute vector p0p1 */ |
| 487 |
if (fillo&F_FORE && ABS(p1->z-p0->z) <= zt) { |
| 488 |
s1x = p1->x - p0->x; |
| 489 |
s1y = p1->y - p0->y; |
| 490 |
l1 = ABS(s1x); |
| 491 |
if (p1isy = (ABS(s1y) > l1)) |
| 492 |
l1 = ABS(s1y); |
| 493 |
else if (l1 < 1) |
| 494 |
l1 = 1; |
| 495 |
} else { |
| 496 |
l1 = s1x = s1y = 1; |
| 497 |
p1isy = -1; |
| 498 |
} |
| 499 |
/* compute vector p0p2 */ |
| 500 |
if (fillo&F_FORE && ABS(p2->z-p0->z) <= zt) { |
| 501 |
s2x = p2->x - p0->x; |
| 502 |
s2y = p2->y - p0->y; |
| 503 |
if (p1isy == 1) |
| 504 |
l2 = ABS(s2x); |
| 505 |
else { |
| 506 |
l2 = ABS(s2y); |
| 507 |
if (p1isy != 0 && ABS(s2x) > l2) |
| 508 |
l2 = ABS(s2x); |
| 509 |
} |
| 510 |
if (l2 < 1) |
| 511 |
l2 = 1; |
| 512 |
} else |
| 513 |
l2 = s2x = s2y = 1; |
| 514 |
/* fill the parallelogram */ |
| 515 |
if (averaging) { |
| 516 |
colr_color(pval, pix); |
| 517 |
scalecolor(pval, w); |
| 518 |
} |
| 519 |
for (c1 = l1; c1-- > 0; ) { |
| 520 |
x1 = p0->x + c1*s1x/l1; |
| 521 |
y1 = p0->y + c1*s1y/l1; |
| 522 |
for (c2 = l2; c2-- > 0; ) { |
| 523 |
x = x1 + c2*s2x/l2; |
| 524 |
if (x < 0 || x >= hresolu) |
| 525 |
continue; |
| 526 |
y = y1 + c2*s2y/l2; |
| 527 |
if (y < 0 || y >= vresolu) |
| 528 |
continue; |
| 529 |
if (averaging) { |
| 530 |
if (zscan(y)[x] <= 0 || zscan(y)[x]-z |
| 531 |
> zeps*zscan(y)[x]) { |
| 532 |
copycolor(sscan(y)[x], pval); |
| 533 |
wscan(y)[x] = w; |
| 534 |
zscan(y)[x] = z; |
| 535 |
} else if (z-zscan(y)[x] <= zeps*zscan(y)[x]) { |
| 536 |
addcolor(sscan(y)[x], pval); |
| 537 |
wscan(y)[x] += w; |
| 538 |
} |
| 539 |
} else if (zscan(y)[x] <= 0 || zscan(y)[x]-z |
| 540 |
> zeps*zscan(y)[x]) { |
| 541 |
copycolr(pscan(y)[x], pix); |
| 542 |
zscan(y)[x] = z; |
| 543 |
} |
| 544 |
} |
| 545 |
} |
| 546 |
} |
| 547 |
|
| 548 |
|
| 549 |
double |
| 550 |
movepixel(pos) /* reposition image point */ |
| 551 |
register FVECT pos; |
| 552 |
{ |
| 553 |
FVECT pt, tdir, odir; |
| 554 |
double d; |
| 555 |
register int i; |
| 556 |
|
| 557 |
if (pos[2] <= 0) /* empty pixel */ |
| 558 |
return(0); |
| 559 |
if (!averaging && hasmatrix) { |
| 560 |
pos[0] += theirview.hoff - .5; |
| 561 |
pos[1] += theirview.voff - .5; |
| 562 |
if (theirview.type == VT_PER) { |
| 563 |
if (normdist) /* adjust distance */ |
| 564 |
pos[2] /= sqrt(1. + pos[0]*pos[0]*theirview.hn2 |
| 565 |
+ pos[1]*pos[1]*theirview.vn2); |
| 566 |
pos[0] *= pos[2]; |
| 567 |
pos[1] *= pos[2]; |
| 568 |
} |
| 569 |
multp3(pos, pos, theirs2ours); |
| 570 |
if (pos[2] <= 0) |
| 571 |
return(0); |
| 572 |
if (ourview.type == VT_PER) { |
| 573 |
pos[0] /= pos[2]; |
| 574 |
pos[1] /= pos[2]; |
| 575 |
} |
| 576 |
pos[0] += .5 - ourview.hoff; |
| 577 |
pos[1] += .5 - ourview.voff; |
| 578 |
} else { |
| 579 |
if (viewray(pt, tdir, &theirview, pos[0], pos[1]) < -FTINY) |
| 580 |
return(0); |
| 581 |
if (!normdist && theirview.type == VT_PER) /* adjust */ |
| 582 |
pos[2] *= sqrt(1. + pos[0]*pos[0]*theirview.hn2 |
| 583 |
+ pos[1]*pos[1]*theirview.vn2); |
| 584 |
pt[0] += tdir[0]*pos[2]; |
| 585 |
pt[1] += tdir[1]*pos[2]; |
| 586 |
pt[2] += tdir[2]*pos[2]; |
| 587 |
viewloc(pos, &ourview, pt); |
| 588 |
if (pos[2] <= 0) |
| 589 |
return(0); |
| 590 |
} |
| 591 |
if (pos[0] < 0 || pos[0] >= 1-FTINY || pos[1] < 0 || pos[1] >= 1-FTINY) |
| 592 |
return(0); |
| 593 |
if (!averaging) |
| 594 |
return(1); |
| 595 |
if (ourview.type == VT_PAR) /* compute our direction */ |
| 596 |
VCOPY(odir, ourview.vdir); |
| 597 |
else |
| 598 |
for (i = 0; i < 3; i++) |
| 599 |
odir[i] = (pt[i] - ourview.vp[i])/pos[2]; |
| 600 |
d = DOT(odir,tdir); /* compute pixel weight */ |
| 601 |
if (d >= 1.-1./MAXWT/MAXWT) |
| 602 |
return(MAXWT); /* clip to maximum weight */ |
| 603 |
return(1./sqrt(1.-d)); |
| 604 |
} |
| 605 |
|
| 606 |
|
| 607 |
getperim(xl, yl, zline, zfd) /* compute overlapping image area */ |
| 608 |
register struct bound *xl; |
| 609 |
struct bound *yl; |
| 610 |
float *zline; |
| 611 |
int zfd; |
| 612 |
{ |
| 613 |
int step; |
| 614 |
FVECT pos; |
| 615 |
register int x, y; |
| 616 |
/* set up step size */ |
| 617 |
if (scanlen(&tresolu) < numscans(&tresolu)) |
| 618 |
step = scanlen(&tresolu)/NSTEPS; |
| 619 |
else |
| 620 |
step = numscans(&tresolu)/NSTEPS; |
| 621 |
if (step < MINSTEP) { /* not worth cropping? */ |
| 622 |
yl->min = 0; |
| 623 |
yl->max = numscans(&tresolu) - 1; |
| 624 |
x = scanlen(&tresolu) - 1; |
| 625 |
for (y = numscans(&tresolu); y--; ) { |
| 626 |
xl[y].min = 0; |
| 627 |
xl[y].max = x; |
| 628 |
} |
| 629 |
return(1); |
| 630 |
} |
| 631 |
yl->min = 32000; yl->max = 0; /* search for points on image */ |
| 632 |
for (y = step - 1; y < numscans(&tresolu); y += step) { |
| 633 |
if (zfd != -1) { |
| 634 |
if (lseek(zfd, (long)y*scanlen(&tresolu)*sizeof(float), |
| 635 |
0) < 0) |
| 636 |
syserror("lseek"); |
| 637 |
if (read(zfd, (char *)zline, |
| 638 |
scanlen(&tresolu)*sizeof(float)) |
| 639 |
< scanlen(&tresolu)*sizeof(float)) |
| 640 |
syserror("read"); |
| 641 |
} |
| 642 |
xl[y].min = 32000; xl[y].max = 0; /* x max */ |
| 643 |
for (x = scanlen(&tresolu); (x -= step) > 0; ) { |
| 644 |
pix2loc(pos, &tresolu, x, y); |
| 645 |
pos[2] = zline[x]; |
| 646 |
if (movepixel(pos) > FTINY) { |
| 647 |
xl[y].max = x + step - 1; |
| 648 |
xl[y].min = x - step + 1; /* x min */ |
| 649 |
if (xl[y].min < 0) |
| 650 |
xl[y].min = 0; |
| 651 |
for (x = step - 1; x < xl[y].max; x += step) { |
| 652 |
pix2loc(pos, &tresolu, x, y); |
| 653 |
pos[2] = zline[x]; |
| 654 |
if (movepixel(pos) > FTINY) { |
| 655 |
xl[y].min = x - step + 1; |
| 656 |
break; |
| 657 |
} |
| 658 |
} |
| 659 |
if (y < yl->min) /* y limits */ |
| 660 |
yl->min = y - step + 1; |
| 661 |
yl->max = y + step - 1; |
| 662 |
break; |
| 663 |
} |
| 664 |
} |
| 665 |
/* fill in between */ |
| 666 |
if (y < step) { |
| 667 |
xl[y-1].min = xl[y].min; |
| 668 |
xl[y-1].max = xl[y].max; |
| 669 |
} else { |
| 670 |
if (xl[y].min < xl[y-step].min) |
| 671 |
xl[y-1].min = xl[y].min; |
| 672 |
else |
| 673 |
xl[y-1].min = xl[y-step].min; |
| 674 |
if (xl[y].max > xl[y-step].max) |
| 675 |
xl[y-1].max = xl[y].max; |
| 676 |
else |
| 677 |
xl[y-1].max = xl[y-step].max; |
| 678 |
} |
| 679 |
for (x = 2; x < step; x++) |
| 680 |
copystruct(xl+y-x, xl+y-1); |
| 681 |
} |
| 682 |
if (yl->max >= numscans(&tresolu)) |
| 683 |
yl->max = numscans(&tresolu) - 1; |
| 684 |
y -= step; |
| 685 |
for (x = numscans(&tresolu) - 1; x > y; x--) /* fill bottom rows */ |
| 686 |
copystruct(xl+x, xl+y); |
| 687 |
return(yl->max >= yl->min); |
| 688 |
} |
| 689 |
|
| 690 |
|
| 691 |
backpicture(fill, samp) /* background fill algorithm */ |
| 692 |
int (*fill)(); |
| 693 |
int samp; |
| 694 |
{ |
| 695 |
int *yback, xback; |
| 696 |
int y; |
| 697 |
register int x, i; |
| 698 |
/* get back buffer */ |
| 699 |
yback = (int *)malloc(hresolu*sizeof(int)); |
| 700 |
if (yback == NULL) |
| 701 |
syserror(progname); |
| 702 |
for (x = 0; x < hresolu; x++) |
| 703 |
yback[x] = -2; |
| 704 |
/* |
| 705 |
* Xback and yback are the pixel locations of suitable |
| 706 |
* background values in each direction. |
| 707 |
* A value of -2 means unassigned, and -1 means |
| 708 |
* that there is no suitable background in this direction. |
| 709 |
*/ |
| 710 |
/* fill image */ |
| 711 |
for (y = 0; y < vresolu; y++) { |
| 712 |
xback = -2; |
| 713 |
for (x = 0; x < hresolu; x++) |
| 714 |
if (zscan(y)[x] <= 0) { /* empty pixel */ |
| 715 |
/* |
| 716 |
* First, find background from above or below. |
| 717 |
* (farthest assigned pixel) |
| 718 |
*/ |
| 719 |
if (yback[x] == -2) { |
| 720 |
for (i = y+1; i < vresolu; i++) |
| 721 |
if (zscan(i)[x] > 0) |
| 722 |
break; |
| 723 |
if (i < vresolu |
| 724 |
&& (y <= 0 || zscan(y-1)[x] < zscan(i)[x])) |
| 725 |
yback[x] = i; |
| 726 |
else |
| 727 |
yback[x] = y-1; |
| 728 |
} |
| 729 |
/* |
| 730 |
* Next, find background from left or right. |
| 731 |
*/ |
| 732 |
if (xback == -2) { |
| 733 |
for (i = x+1; i < hresolu; i++) |
| 734 |
if (zscan(y)[i] > 0) |
| 735 |
break; |
| 736 |
if (i < hresolu |
| 737 |
&& (x <= 0 || zscan(y)[x-1] < zscan(y)[i])) |
| 738 |
xback = i; |
| 739 |
else |
| 740 |
xback = x-1; |
| 741 |
} |
| 742 |
/* |
| 743 |
* If we have no background for this pixel, |
| 744 |
* use the given fill function. |
| 745 |
*/ |
| 746 |
if (xback < 0 && yback[x] < 0) |
| 747 |
goto fillit; |
| 748 |
/* |
| 749 |
* Compare, and use the background that is |
| 750 |
* farther, unless one of them is next to us. |
| 751 |
* If the background is too distant, call |
| 752 |
* the fill function. |
| 753 |
*/ |
| 754 |
if ( yback[x] < 0 |
| 755 |
|| (xback >= 0 && ABS(x-xback) <= 1) |
| 756 |
|| ( ABS(y-yback[x]) > 1 |
| 757 |
&& zscan(yback[x])[x] |
| 758 |
< zscan(y)[xback] ) ) { |
| 759 |
if (samp > 0 && ABS(x-xback) >= samp) |
| 760 |
goto fillit; |
| 761 |
if (averaging) { |
| 762 |
copycolor(sscan(y)[x], |
| 763 |
sscan(y)[xback]); |
| 764 |
wscan(y)[x] = wscan(y)[xback]; |
| 765 |
} else |
| 766 |
copycolr(pscan(y)[x], |
| 767 |
pscan(y)[xback]); |
| 768 |
zscan(y)[x] = zscan(y)[xback]; |
| 769 |
} else { |
| 770 |
if (samp > 0 && ABS(y-yback[x]) > samp) |
| 771 |
goto fillit; |
| 772 |
if (averaging) { |
| 773 |
copycolor(sscan(y)[x], |
| 774 |
sscan(yback[x])[x]); |
| 775 |
wscan(y)[x] = |
| 776 |
wscan(yback[x])[x]; |
| 777 |
} else |
| 778 |
copycolr(pscan(y)[x], |
| 779 |
pscan(yback[x])[x]); |
| 780 |
zscan(y)[x] = zscan(yback[x])[x]; |
| 781 |
} |
| 782 |
continue; |
| 783 |
fillit: |
| 784 |
(*fill)(x,y); |
| 785 |
if (fill == rcalfill) { /* use it */ |
| 786 |
clearqueue(); |
| 787 |
xback = x; |
| 788 |
yback[x] = y; |
| 789 |
} |
| 790 |
} else { /* full pixel */ |
| 791 |
yback[x] = -2; |
| 792 |
xback = -2; |
| 793 |
} |
| 794 |
} |
| 795 |
free((char *)yback); |
| 796 |
} |
| 797 |
|
| 798 |
|
| 799 |
fillpicture(fill) /* paint in empty pixels using fill */ |
| 800 |
int (*fill)(); |
| 801 |
{ |
| 802 |
register int x, y; |
| 803 |
|
| 804 |
for (y = 0; y < vresolu; y++) |
| 805 |
for (x = 0; x < hresolu; x++) |
| 806 |
if (zscan(y)[x] <= 0) |
| 807 |
(*fill)(x,y); |
| 808 |
} |
| 809 |
|
| 810 |
|
| 811 |
clipaft() /* perform aft clipping as indicated */ |
| 812 |
{ |
| 813 |
register int x, y; |
| 814 |
double tstdist; |
| 815 |
double yzn2, vx; |
| 816 |
|
| 817 |
if (ourview.vaft <= FTINY) |
| 818 |
return; |
| 819 |
tstdist = ourview.vaft - ourview.vfore; |
| 820 |
for (y = 0; y < vresolu; y++) { |
| 821 |
if (ourview.type == VT_PER) { /* adjust distance */ |
| 822 |
yzn2 = (y+.5)/vresolu + ourview.voff - .5; |
| 823 |
yzn2 = 1. + yzn2*yzn2*ourview.vn2; |
| 824 |
tstdist = (ourview.vaft - ourview.vfore)*sqrt(yzn2); |
| 825 |
} |
| 826 |
for (x = 0; x < hresolu; x++) |
| 827 |
if (zscan(y)[x] > tstdist) { |
| 828 |
if (ourview.type == VT_PER) { |
| 829 |
vx = (x+.5)/hresolu + ourview.hoff - .5; |
| 830 |
if (zscan(y)[x] <= (ourview.vaft - |
| 831 |
ourview.vfore) * |
| 832 |
sqrt(vx*vx*ourview.hn2 + yzn2)) |
| 833 |
continue; |
| 834 |
} |
| 835 |
if (averaging) |
| 836 |
bzero(sscan(y)[x], sizeof(COLOR)); |
| 837 |
else |
| 838 |
bzero(pscan(y)[x], sizeof(COLR)); |
| 839 |
zscan(y)[x] = 0.0; |
| 840 |
} |
| 841 |
} |
| 842 |
} |
| 843 |
|
| 844 |
|
| 845 |
writepicture() /* write out picture */ |
| 846 |
{ |
| 847 |
int y; |
| 848 |
register int x; |
| 849 |
double d; |
| 850 |
|
| 851 |
fprtresolu(hresolu, vresolu, stdout); |
| 852 |
for (y = vresolu-1; y >= 0; y--) |
| 853 |
if (averaging) { |
| 854 |
for (x = 0; x < hresolu; x++) { /* average pixels */ |
| 855 |
d = 1./wscan(y)[x]; |
| 856 |
scalecolor(sscan(y)[x], d); |
| 857 |
wscan(y)[x] = 1; |
| 858 |
} |
| 859 |
if (fwritescan(sscan(y), hresolu, stdout) < 0) |
| 860 |
syserror(progname); |
| 861 |
} else if (fwritecolrs(pscan(y), hresolu, stdout) < 0) |
| 862 |
syserror(progname); |
| 863 |
} |
| 864 |
|
| 865 |
|
| 866 |
writedistance(fname) /* write out z file */ |
| 867 |
char *fname; |
| 868 |
{ |
| 869 |
int donorm = normdist && ourview.type == VT_PER; |
| 870 |
int fd; |
| 871 |
int y; |
| 872 |
float *zout; |
| 873 |
|
| 874 |
if ((fd = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666)) == -1) |
| 875 |
syserror(fname); |
| 876 |
if (donorm |
| 877 |
&& (zout = (float *)malloc(hresolu*sizeof(float))) == NULL) |
| 878 |
syserror(progname); |
| 879 |
for (y = vresolu-1; y >= 0; y--) { |
| 880 |
if (donorm) { |
| 881 |
double vx, yzn2; |
| 882 |
register int x; |
| 883 |
yzn2 = (y+.5)/vresolu + ourview.voff - .5; |
| 884 |
yzn2 = 1. + yzn2*yzn2*ourview.vn2; |
| 885 |
for (x = 0; x < hresolu; x++) { |
| 886 |
vx = (x+.5)/hresolu + ourview.hoff - .5; |
| 887 |
zout[x] = zscan(y)[x] |
| 888 |
* sqrt(vx*vx*ourview.hn2 + yzn2); |
| 889 |
} |
| 890 |
} else |
| 891 |
zout = zscan(y); |
| 892 |
if (write(fd, (char *)zout, hresolu*sizeof(float)) |
| 893 |
< hresolu*sizeof(float)) |
| 894 |
syserror(fname); |
| 895 |
} |
| 896 |
if (donorm) |
| 897 |
free((char *)zout); |
| 898 |
close(fd); |
| 899 |
} |
| 900 |
|
| 901 |
|
| 902 |
backfill(x, y) /* fill pixel with background */ |
| 903 |
int x, y; |
| 904 |
{ |
| 905 |
if (averaging) { |
| 906 |
copycolor(sscan(y)[x], backcolor); |
| 907 |
wscan(y)[x] = 1; |
| 908 |
} else |
| 909 |
copycolr(pscan(y)[x], backcolr); |
| 910 |
zscan(y)[x] = backz; |
| 911 |
} |
| 912 |
|
| 913 |
|
| 914 |
calstart(prog, args) /* start fill calculation */ |
| 915 |
char *prog, *args; |
| 916 |
{ |
| 917 |
char combuf[512]; |
| 918 |
char *argv[64]; |
| 919 |
int rval; |
| 920 |
register char **wp, *cp; |
| 921 |
|
| 922 |
if (childpid != -1) { |
| 923 |
fprintf(stderr, "%s: too many calculations\n", progname); |
| 924 |
exit(1); |
| 925 |
} |
| 926 |
strcpy(combuf, prog); |
| 927 |
strcat(combuf, args); |
| 928 |
cp = combuf; |
| 929 |
wp = argv; |
| 930 |
for ( ; ; ) { |
| 931 |
while (isspace(*cp)) /* nullify spaces */ |
| 932 |
*cp++ = '\0'; |
| 933 |
if (!*cp) /* all done? */ |
| 934 |
break; |
| 935 |
*wp++ = cp; /* add argument to list */ |
| 936 |
while (*++cp && !isspace(*cp)) |
| 937 |
; |
| 938 |
} |
| 939 |
*wp = NULL; |
| 940 |
/* start process */ |
| 941 |
if ((rval = open_process(PDesc, argv)) < 0) |
| 942 |
syserror(progname); |
| 943 |
if (rval == 0) { |
| 944 |
fprintf(stderr, "%s: command not found\n", argv[0]); |
| 945 |
exit(1); |
| 946 |
} |
| 947 |
packsiz = rval/(6*sizeof(float)) - 1; |
| 948 |
if (packsiz > PACKSIZ) |
| 949 |
packsiz = PACKSIZ; |
| 950 |
queuesiz = 0; |
| 951 |
} |
| 952 |
|
| 953 |
|
| 954 |
caldone() /* done with calculation */ |
| 955 |
{ |
| 956 |
if (childpid == -1) |
| 957 |
return; |
| 958 |
clearqueue(); |
| 959 |
close_process(PDesc); |
| 960 |
childpid = -1; |
| 961 |
} |
| 962 |
|
| 963 |
|
| 964 |
rcalfill(x, y) /* fill with ray-calculated pixel */ |
| 965 |
int x, y; |
| 966 |
{ |
| 967 |
if (queuesiz >= packsiz) /* flush queue if needed */ |
| 968 |
clearqueue(); |
| 969 |
/* add position to queue */ |
| 970 |
queue[queuesiz][0] = x; |
| 971 |
queue[queuesiz][1] = y; |
| 972 |
queuesiz++; |
| 973 |
} |
| 974 |
|
| 975 |
|
| 976 |
clearqueue() /* process queue */ |
| 977 |
{ |
| 978 |
FVECT orig, dir; |
| 979 |
float fbuf[6*(PACKSIZ+1)]; |
| 980 |
register float *fbp; |
| 981 |
register int i; |
| 982 |
|
| 983 |
if (queuesiz == 0) |
| 984 |
return; |
| 985 |
fbp = fbuf; |
| 986 |
for (i = 0; i < queuesiz; i++) { |
| 987 |
viewray(orig, dir, &ourview, |
| 988 |
(queue[i][0]+.5)/hresolu, |
| 989 |
(queue[i][1]+.5)/vresolu); |
| 990 |
*fbp++ = orig[0]; *fbp++ = orig[1]; *fbp++ = orig[2]; |
| 991 |
*fbp++ = dir[0]; *fbp++ = dir[1]; *fbp++ = dir[2]; |
| 992 |
} |
| 993 |
/* mark end and get results */ |
| 994 |
bzero((char *)fbp, 6*sizeof(float)); |
| 995 |
if (process(PDesc, fbuf, fbuf, 4*sizeof(float)*queuesiz, |
| 996 |
6*sizeof(float)*(queuesiz+1)) != |
| 997 |
4*sizeof(float)*queuesiz) { |
| 998 |
fprintf(stderr, "%s: error reading from rtrace process\n", |
| 999 |
progname); |
| 1000 |
exit(1); |
| 1001 |
} |
| 1002 |
fbp = fbuf; |
| 1003 |
for (i = 0; i < queuesiz; i++) { |
| 1004 |
if (ourexp > 0 && ourexp != 1.0) { |
| 1005 |
fbp[0] *= ourexp; |
| 1006 |
fbp[1] *= ourexp; |
| 1007 |
fbp[2] *= ourexp; |
| 1008 |
} |
| 1009 |
if (averaging) { |
| 1010 |
setcolor(sscan(queue[i][1])[queue[i][0]], |
| 1011 |
fbp[0], fbp[1], fbp[2]); |
| 1012 |
wscan(queue[i][1])[queue[i][0]] = 1; |
| 1013 |
} else |
| 1014 |
setcolr(pscan(queue[i][1])[queue[i][0]], |
| 1015 |
fbp[0], fbp[1], fbp[2]); |
| 1016 |
zscan(queue[i][1])[queue[i][0]] = fbp[3]; |
| 1017 |
fbp += 4; |
| 1018 |
} |
| 1019 |
queuesiz = 0; |
| 1020 |
} |
| 1021 |
|
| 1022 |
|
| 1023 |
syserror(s) /* report error and exit */ |
| 1024 |
char *s; |
| 1025 |
{ |
| 1026 |
perror(s); |
| 1027 |
exit(1); |
| 1028 |
} |
