1 |
greg |
1.1 |
#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
3 |
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#endif |
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5 |
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/* |
6 |
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* Interpolate and extrapolate pictures with different view parameters. |
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* |
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* Greg Ward 09Dec89 |
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*/ |
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#include "standard.h" |
12 |
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13 |
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#include "view.h" |
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15 |
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#include "color.h" |
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17 |
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#define pscan(y) (ourpict+(y)*ourview.hresolu) |
18 |
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#define zscan(y) (ourzbuf+(y)*ourview.hresolu) |
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20 |
greg |
1.3 |
#define ABS(x) ((x)>0?(x):-(x)) |
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22 |
greg |
1.1 |
VIEW ourview = STDVIEW(512); /* desired view */ |
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24 |
greg |
1.8 |
double zeps = .02; /* allowed z epsilon */ |
25 |
greg |
1.1 |
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26 |
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COLR *ourpict; /* output picture */ |
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float *ourzbuf; /* corresponding z-buffer */ |
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29 |
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char *progname; |
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31 |
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VIEW theirview = STDVIEW(512); /* input view */ |
32 |
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int gotview; /* got input view? */ |
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34 |
greg |
1.5 |
double theirs2ours[4][4]; /* transformation matrix */ |
35 |
greg |
1.1 |
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36 |
greg |
1.5 |
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37 |
greg |
1.1 |
main(argc, argv) /* interpolate pictures */ |
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int argc; |
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char *argv[]; |
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{ |
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#define check(olen,narg) if (argv[i][olen] || narg >= argc-i) goto badopt |
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int gotvfile = 0; |
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char *err; |
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int i; |
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46 |
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progname = argv[0]; |
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48 |
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for (i = 1; i < argc && argv[i][0] == '-'; i++) |
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switch (argv[i][1]) { |
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case 't': /* threshold */ |
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check(2,1); |
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zeps = atof(argv[++i]); |
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break; |
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greg |
1.6 |
case 'x': /* x resolution */ |
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check(2,1); |
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ourview.hresolu = atoi(argv[++i]); |
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break; |
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case 'y': /* y resolution */ |
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check(2,1); |
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ourview.vresolu = atoi(argv[++i]); |
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break; |
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greg |
1.1 |
case 'v': /* view */ |
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switch (argv[i][2]) { |
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case 't': /* type */ |
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check(4,0); |
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ourview.type = argv[i][3]; |
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break; |
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case 'p': /* point */ |
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check(3,3); |
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ourview.vp[0] = atof(argv[++i]); |
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ourview.vp[1] = atof(argv[++i]); |
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ourview.vp[2] = atof(argv[++i]); |
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break; |
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case 'd': /* direction */ |
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check(3,3); |
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ourview.vdir[0] = atof(argv[++i]); |
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ourview.vdir[1] = atof(argv[++i]); |
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ourview.vdir[2] = atof(argv[++i]); |
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break; |
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case 'u': /* up */ |
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check(3,3); |
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ourview.vup[0] = atof(argv[++i]); |
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ourview.vup[1] = atof(argv[++i]); |
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ourview.vup[2] = atof(argv[++i]); |
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break; |
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case 'h': /* horizontal */ |
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check(3,1); |
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ourview.horiz = atof(argv[++i]); |
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break; |
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case 'v': /* vertical */ |
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check(3,1); |
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ourview.vert = atof(argv[++i]); |
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break; |
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case 'f': /* file */ |
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check(3,1); |
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gotvfile = viewfile(argv[++i], &ourview); |
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if (gotvfile < 0) { |
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perror(argv[i]); |
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exit(1); |
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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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goto badopt; |
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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: unknown option '%s'\n", |
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progname, argv[i]); |
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exit(1); |
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} |
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/* check arguments */ |
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if (argc-i < 2 || (argc-i)%2) { |
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fprintf(stderr, "Usage: %s [view args] pfile zfile ..\n", |
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progname); |
120 |
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exit(1); |
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} |
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/* set view */ |
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if (err = setview(&ourview)) { |
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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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/* allocate frame */ |
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ourpict = (COLR *)calloc(ourview.hresolu*ourview.vresolu,sizeof(COLR)); |
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ourzbuf = (float *)calloc(ourview.hresolu*ourview.vresolu,sizeof(float)); |
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if (ourpict == NULL || ourzbuf == NULL) { |
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perror(progname); |
132 |
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exit(1); |
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} |
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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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fillpicture(); |
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/* add to header */ |
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printargs(argc, argv, stdout); |
141 |
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if (gotvfile) { |
142 |
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printf(VIEWSTR); |
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fprintview(&ourview, stdout); |
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printf("\n"); |
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} |
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printf("\n"); |
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/* write output */ |
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writepicture(); |
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150 |
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exit(0); |
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#undef check |
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} |
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154 |
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155 |
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headline(s) /* process header string */ |
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char *s; |
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{ |
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static char *altname[] = {"rview","rpict","pinterp",VIEWSTR,NULL}; |
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register char **an; |
160 |
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printf("\t%s", s); |
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for (an = altname; *an != NULL; an++) |
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if (!strncmp(*an, s, strlen(*an))) { |
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if (sscanview(&theirview, s+strlen(*an)) == 0) |
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gotview++; |
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break; |
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} |
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} |
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171 |
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172 |
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addpicture(pfile, zfile) /* add picture to output */ |
173 |
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char *pfile, *zfile; |
174 |
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{ |
175 |
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FILE *pfp, *zfp; |
176 |
greg |
1.8 |
char *err; |
177 |
greg |
1.1 |
COLR *scanin; |
178 |
greg |
1.8 |
float *zin, *zout; |
179 |
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int *pout; |
180 |
greg |
1.1 |
int xres, yres; |
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int y; |
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/* open input files */ |
183 |
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if ((pfp = fopen(pfile, "r")) == NULL) { |
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perror(pfile); |
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exit(1); |
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} |
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if ((zfp = fopen(zfile, "r")) == NULL) { |
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perror(zfile); |
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exit(1); |
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} |
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/* get header and view */ |
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printf("%s:\n", pfile); |
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gotview = 0; |
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getheader(pfp, headline); |
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if (!gotview || fgetresolu(&xres, &yres, pfp) != (YMAJOR|YDECR)) { |
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fprintf(stderr, "%s: picture view error\n", pfile); |
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exit(1); |
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} |
199 |
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theirview.hresolu = xres; |
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theirview.vresolu = yres; |
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if (err = setview(&theirview)) { |
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fprintf(stderr, "%s: %s\n", pfile, err); |
203 |
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exit(1); |
204 |
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} |
205 |
greg |
1.5 |
/* compute transformation */ |
206 |
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pixform(theirs2ours, &theirview, &ourview); |
207 |
greg |
1.1 |
/* allocate scanlines */ |
208 |
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scanin = (COLR *)malloc(xres*sizeof(COLR)); |
209 |
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zin = (float *)malloc(xres*sizeof(float)); |
210 |
greg |
1.8 |
zout = (float *)calloc(xres, sizeof(float)); |
211 |
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pout = (int *)calloc(xres, sizeof(int)); |
212 |
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if (scanin == NULL || zin == NULL || zout == NULL || pout == NULL) { |
213 |
greg |
1.1 |
perror(progname); |
214 |
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exit(1); |
215 |
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} |
216 |
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/* load image */ |
217 |
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for (y = yres-1; y >= 0; y--) { |
218 |
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if (freadcolrs(scanin, xres, pfp) < 0) { |
219 |
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fprintf(stderr, "%s: read error\n", pfile); |
220 |
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exit(1); |
221 |
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} |
222 |
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if (fread(zin, sizeof(float), xres, zfp) < xres) { |
223 |
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fprintf(stderr, "%s: read error\n", zfile); |
224 |
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exit(1); |
225 |
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} |
226 |
greg |
1.8 |
addscanline(y, scanin, zin, pout, zout); |
227 |
greg |
1.1 |
} |
228 |
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/* clean up */ |
229 |
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free((char *)scanin); |
230 |
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free((char *)zin); |
231 |
greg |
1.8 |
free((char *)pout); |
232 |
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free((char *)zout); |
233 |
greg |
1.1 |
fclose(pfp); |
234 |
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fclose(zfp); |
235 |
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} |
236 |
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237 |
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238 |
greg |
1.5 |
pixform(xfmat, vw1, vw2) /* compute view1 to view2 matrix */ |
239 |
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register double xfmat[4][4]; |
240 |
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register VIEW *vw1, *vw2; |
241 |
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{ |
242 |
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double m4t[4][4]; |
243 |
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244 |
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setident4(xfmat); |
245 |
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xfmat[0][0] = vw1->vhinc[0]; |
246 |
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xfmat[0][1] = vw1->vhinc[1]; |
247 |
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xfmat[0][2] = vw1->vhinc[2]; |
248 |
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xfmat[1][0] = vw1->vvinc[0]; |
249 |
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xfmat[1][1] = vw1->vvinc[1]; |
250 |
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xfmat[1][2] = vw1->vvinc[2]; |
251 |
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xfmat[2][0] = vw1->vdir[0]; |
252 |
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xfmat[2][1] = vw1->vdir[1]; |
253 |
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xfmat[2][2] = vw1->vdir[2]; |
254 |
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xfmat[3][0] = vw1->vp[0]; |
255 |
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xfmat[3][1] = vw1->vp[1]; |
256 |
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xfmat[3][2] = vw1->vp[2]; |
257 |
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setident4(m4t); |
258 |
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m4t[0][0] = vw2->vhinc[0]/vw2->vhn2; |
259 |
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m4t[1][0] = vw2->vhinc[1]/vw2->vhn2; |
260 |
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m4t[2][0] = vw2->vhinc[2]/vw2->vhn2; |
261 |
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m4t[3][0] = -DOT(vw2->vp,vw2->vhinc)/vw2->vhn2; |
262 |
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m4t[0][1] = vw2->vvinc[0]/vw2->vvn2; |
263 |
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m4t[1][1] = vw2->vvinc[1]/vw2->vvn2; |
264 |
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m4t[2][1] = vw2->vvinc[2]/vw2->vvn2; |
265 |
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m4t[3][1] = -DOT(vw2->vp,vw2->vvinc)/vw2->vvn2; |
266 |
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m4t[0][2] = vw2->vdir[0]; |
267 |
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m4t[1][2] = vw2->vdir[1]; |
268 |
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m4t[2][2] = vw2->vdir[2]; |
269 |
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m4t[3][2] = -DOT(vw2->vp,vw2->vdir); |
270 |
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multmat4(xfmat, xfmat, m4t); |
271 |
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} |
272 |
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273 |
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274 |
greg |
1.8 |
addscanline(y, pline, zline, lasty, lastyz) /* add scanline to output */ |
275 |
greg |
1.1 |
int y; |
276 |
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COLR *pline; |
277 |
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float *zline; |
278 |
greg |
1.8 |
int *lasty; |
279 |
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float *lastyz; |
280 |
greg |
1.1 |
{ |
281 |
greg |
1.8 |
extern double sqrt(), fabs(); |
282 |
greg |
1.5 |
double pos[3]; |
283 |
greg |
1.8 |
int lastx = 0; |
284 |
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double lastxz = 0; |
285 |
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double zt; |
286 |
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int xpos, ypos; |
287 |
greg |
1.1 |
register int x; |
288 |
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|
289 |
greg |
1.8 |
for (x = theirview.hresolu-1; x >= 0; x--) { |
290 |
greg |
1.5 |
pos[0] = x - .5*(theirview.hresolu-1); |
291 |
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pos[1] = y - .5*(theirview.vresolu-1); |
292 |
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pos[2] = zline[x]; |
293 |
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if (theirview.type == VT_PER) { |
294 |
greg |
1.8 |
/* |
295 |
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* The following (single) statement can go |
296 |
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* if z is along the view direction rather |
297 |
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* than an eye ray. |
298 |
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*/ |
299 |
greg |
1.5 |
pos[2] /= sqrt( 1. |
300 |
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+ pos[0]*pos[0]*theirview.vhn2 |
301 |
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+ pos[1]*pos[1]*theirview.vvn2 ); |
302 |
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pos[0] *= pos[2]; |
303 |
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pos[1] *= pos[2]; |
304 |
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} |
305 |
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multp3(pos, pos, theirs2ours); |
306 |
greg |
1.8 |
if (pos[2] <= 0) |
307 |
greg |
1.1 |
continue; |
308 |
greg |
1.5 |
if (ourview.type == VT_PER) { |
309 |
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pos[0] /= pos[2]; |
310 |
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pos[1] /= pos[2]; |
311 |
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} |
312 |
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pos[0] += .5*ourview.hresolu; |
313 |
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pos[1] += .5*ourview.vresolu; |
314 |
greg |
1.8 |
if (pos[0] < 0 || (xpos = pos[0]) >= ourview.hresolu |
315 |
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|| pos[1] < 0 || (ypos = pos[1]) >= ourview.vresolu) |
316 |
greg |
1.5 |
continue; |
317 |
greg |
1.8 |
/* add pixel to our image */ |
318 |
|
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zt = 2.*zeps*zline[x]; |
319 |
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addpixel(xpos, ypos, |
320 |
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(fabs(zline[x]-lastxz) <= zt) ? lastx - xpos : 1, |
321 |
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(fabs(zline[x]-lastyz[x]) <= zt) ? lasty[x] - ypos : 1, |
322 |
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pline[x], pos[2]); |
323 |
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lastx = xpos; |
324 |
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lasty[x] = ypos; |
325 |
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lastxz = lastyz[x] = zline[x]; |
326 |
greg |
1.1 |
} |
327 |
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} |
328 |
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329 |
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330 |
greg |
1.8 |
addpixel(xstart, ystart, width, height, pix, z) /* fill in area for pixel */ |
331 |
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int xstart, ystart; |
332 |
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int width, height; |
333 |
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COLR pix; |
334 |
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double z; |
335 |
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{ |
336 |
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register int x, y; |
337 |
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/* make width and height positive */ |
338 |
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if (width < 0) { |
339 |
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width = -width; |
340 |
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xstart = xstart-width+1; |
341 |
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} else if (width == 0) |
342 |
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width = 1; |
343 |
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if (height < 0) { |
344 |
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height = -height; |
345 |
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ystart = ystart-height+1; |
346 |
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} else if (height == 0) |
347 |
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height = 1; |
348 |
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/* fill pixel(s) within rectangle */ |
349 |
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for (y = ystart; y < ystart+height; y++) |
350 |
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for (x = xstart; x < xstart+width; x++) |
351 |
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if (zscan(y)[x] <= 0 |
352 |
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|| zscan(y)[x]-z > zeps*zscan(y)[x]) { |
353 |
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zscan(y)[x] = z; |
354 |
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copycolr(pscan(y)[x], pix); |
355 |
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} |
356 |
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} |
357 |
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358 |
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359 |
greg |
1.1 |
fillpicture() /* fill in empty spaces */ |
360 |
|
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{ |
361 |
greg |
1.2 |
int *yback, xback; |
362 |
greg |
1.1 |
int y; |
363 |
greg |
1.2 |
COLR pfill; |
364 |
|
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register int x, i; |
365 |
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/* get back buffer */ |
366 |
|
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yback = (int *)malloc(ourview.hresolu*sizeof(int)); |
367 |
|
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if (yback == NULL) { |
368 |
|
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perror(progname); |
369 |
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return; |
370 |
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} |
371 |
|
|
for (x = 0; x < ourview.hresolu; x++) |
372 |
greg |
1.4 |
yback[x] = -2; |
373 |
greg |
1.7 |
/* |
374 |
|
|
* Xback and yback are the pixel locations of suitable |
375 |
|
|
* background values in each direction. |
376 |
|
|
* A value of -2 means unassigned, and -1 means |
377 |
|
|
* that there is no suitable background in this direction. |
378 |
|
|
*/ |
379 |
greg |
1.2 |
/* fill image */ |
380 |
greg |
1.4 |
for (y = 0; y < ourview.vresolu; y++) { |
381 |
|
|
xback = -2; |
382 |
greg |
1.1 |
for (x = 0; x < ourview.hresolu; x++) |
383 |
greg |
1.8 |
if (zscan(y)[x] <= 0) { /* empty pixel */ |
384 |
greg |
1.7 |
/* |
385 |
|
|
* First, find background from above or below. |
386 |
|
|
* (farthest assigned pixel) |
387 |
|
|
*/ |
388 |
greg |
1.4 |
if (yback[x] == -2) { |
389 |
|
|
for (i = y+1; i < ourview.vresolu; i++) |
390 |
greg |
1.8 |
if (zscan(i)[x] > 0) |
391 |
greg |
1.4 |
break; |
392 |
|
|
if (i < ourview.vresolu |
393 |
greg |
1.2 |
&& (y <= 0 || zscan(y-1)[x] < zscan(i)[x])) |
394 |
greg |
1.4 |
yback[x] = i; |
395 |
|
|
else |
396 |
|
|
yback[x] = y-1; |
397 |
greg |
1.2 |
} |
398 |
greg |
1.7 |
/* |
399 |
|
|
* Next, find background from left or right. |
400 |
|
|
*/ |
401 |
greg |
1.4 |
if (xback == -2) { |
402 |
|
|
for (i = x+1; x < ourview.hresolu; i++) |
403 |
greg |
1.8 |
if (zscan(y)[i] > 0) |
404 |
greg |
1.4 |
break; |
405 |
|
|
if (i < ourview.hresolu |
406 |
|
|
&& (x <= 0 || zscan(y)[x-1] < zscan(y)[i])) |
407 |
|
|
xback = i; |
408 |
|
|
else |
409 |
|
|
xback = x-1; |
410 |
|
|
} |
411 |
|
|
if (xback < 0 && yback[x] < 0) |
412 |
greg |
1.7 |
continue; /* no background */ |
413 |
|
|
/* |
414 |
|
|
* Compare, and use the background that is |
415 |
|
|
* farther, unless one of them is next to us. |
416 |
|
|
*/ |
417 |
greg |
1.4 |
if (yback[x] < 0 || ABS(x-xback) <= 1 |
418 |
|
|
|| ( ABS(y-yback[x]) > 1 |
419 |
|
|
&& zscan(yback[x])[x] < zscan(y)[xback] )) |
420 |
|
|
copycolr(pscan(y)[x],pscan(y)[xback]); |
421 |
|
|
else |
422 |
|
|
copycolr(pscan(y)[x],pscan(yback[x])[x]); |
423 |
|
|
} else { /* full pixel */ |
424 |
|
|
yback[x] = -2; |
425 |
|
|
xback = -2; |
426 |
|
|
} |
427 |
|
|
} |
428 |
greg |
1.2 |
free((char *)yback); |
429 |
greg |
1.1 |
} |
430 |
|
|
|
431 |
|
|
|
432 |
|
|
writepicture() /* write out picture */ |
433 |
|
|
{ |
434 |
|
|
int y; |
435 |
|
|
|
436 |
|
|
fputresolu(YMAJOR|YDECR, ourview.hresolu, ourview.vresolu, stdout); |
437 |
|
|
for (y = ourview.vresolu-1; y >= 0; y--) |
438 |
|
|
if (fwritecolrs(pscan(y), ourview.hresolu, stdout) < 0) { |
439 |
|
|
perror(progname); |
440 |
|
|
exit(1); |
441 |
|
|
} |
442 |
|
|
} |