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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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#endif |
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|
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/* |
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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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|
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#include "standard.h" |
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|
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#include "view.h" |
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|
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#include "color.h" |
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|
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#define pscan(y) (ourpict+(y)*ourview.hresolu) |
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#define zscan(y) (ourzbuf+(y)*ourview.hresolu) |
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|
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#define ABS(x) ((x)>0?(x):-(x)) |
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|
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VIEW ourview = STDVIEW(512); /* desired view */ |
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|
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double zeps = 0.001; /* allowed z epsilon */ |
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|
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COLR *ourpict; /* output picture */ |
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float *ourzbuf; /* corresponding z-buffer */ |
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|
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char *progname; |
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|
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VIEW theirview = STDVIEW(512); /* input view */ |
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int gotview; /* got input view? */ |
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|
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double theirs2ours[4][4]; /* transformation matrix */ |
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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[]; |
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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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|
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progname = argv[0]; |
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|
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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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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); |
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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); |
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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); |
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if (gotvfile) { |
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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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|
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exit(0); |
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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 */ |
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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; |
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|
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printf("\t%s", s); |
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|
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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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|
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|
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addpicture(pfile, zfile) /* add picture to output */ |
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char *pfile, *zfile; |
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{ |
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FILE *pfp, *zfp; |
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COLR *scanin; |
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float *zin; |
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char *err; |
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int xres, yres; |
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int y; |
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/* open input files */ |
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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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} |
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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); |
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exit(1); |
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} |
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/* compute transformation */ |
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pixform(theirs2ours, &theirview, &ourview); |
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/* allocate scanlines */ |
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scanin = (COLR *)malloc(xres*sizeof(COLR)); |
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zin = (float *)malloc(xres*sizeof(float)); |
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if (scanin == NULL || zin == NULL) { |
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perror(progname); |
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exit(1); |
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} |
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/* load image */ |
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for (y = yres-1; y >= 0; y--) { |
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if (freadcolrs(scanin, xres, pfp) < 0) { |
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fprintf(stderr, "%s: read error\n", pfile); |
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exit(1); |
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} |
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if (fread(zin, sizeof(float), xres, zfp) < xres) { |
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fprintf(stderr, "%s: read error\n", zfile); |
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exit(1); |
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} |
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addscanline(y, scanin, zin); |
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} |
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/* clean up */ |
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free((char *)scanin); |
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free((char *)zin); |
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fclose(pfp); |
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fclose(zfp); |
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} |
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|
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|
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pixform(xfmat, vw1, vw2) /* compute view1 to view2 matrix */ |
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register double xfmat[4][4]; |
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register VIEW *vw1, *vw2; |
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{ |
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double m4t[4][4]; |
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|
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setident4(xfmat); |
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xfmat[0][0] = vw1->vhinc[0]; |
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xfmat[0][1] = vw1->vhinc[1]; |
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xfmat[0][2] = vw1->vhinc[2]; |
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xfmat[1][0] = vw1->vvinc[0]; |
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xfmat[1][1] = vw1->vvinc[1]; |
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xfmat[1][2] = vw1->vvinc[2]; |
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xfmat[2][0] = vw1->vdir[0]; |
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xfmat[2][1] = vw1->vdir[1]; |
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xfmat[2][2] = vw1->vdir[2]; |
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xfmat[3][0] = vw1->vp[0]; |
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xfmat[3][1] = vw1->vp[1]; |
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xfmat[3][2] = vw1->vp[2]; |
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setident4(m4t); |
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m4t[0][0] = vw2->vhinc[0]/vw2->vhn2; |
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m4t[1][0] = vw2->vhinc[1]/vw2->vhn2; |
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m4t[2][0] = vw2->vhinc[2]/vw2->vhn2; |
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m4t[3][0] = -DOT(vw2->vp,vw2->vhinc)/vw2->vhn2; |
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m4t[0][1] = vw2->vvinc[0]/vw2->vvn2; |
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m4t[1][1] = vw2->vvinc[1]/vw2->vvn2; |
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m4t[2][1] = vw2->vvinc[2]/vw2->vvn2; |
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m4t[3][1] = -DOT(vw2->vp,vw2->vvinc)/vw2->vvn2; |
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m4t[0][2] = vw2->vdir[0]; |
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m4t[1][2] = vw2->vdir[1]; |
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m4t[2][2] = vw2->vdir[2]; |
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m4t[3][2] = -DOT(vw2->vp,vw2->vdir); |
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multmat4(xfmat, xfmat, m4t); |
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} |
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|
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|
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addscanline(y, pline, zline) /* add scanline to output */ |
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int y; |
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COLR *pline; |
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float *zline; |
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{ |
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extern double sqrt(); |
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double pos[3]; |
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register int x; |
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register int xpos, ypos; |
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|
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for (x = 0; x < theirview.hresolu; x++) { |
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pos[0] = x - .5*(theirview.hresolu-1); |
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pos[1] = y - .5*(theirview.vresolu-1); |
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pos[2] = zline[x]; |
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if (theirview.type == VT_PER) { |
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pos[2] /= sqrt( 1. |
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+ pos[0]*pos[0]*theirview.vhn2 |
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+ pos[1]*pos[1]*theirview.vvn2 ); |
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pos[0] *= pos[2]; |
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pos[1] *= pos[2]; |
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} |
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multp3(pos, pos, theirs2ours); |
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if (pos[2] <= 0.0) |
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continue; |
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if (ourview.type == VT_PER) { |
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pos[0] /= pos[2]; |
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pos[1] /= pos[2]; |
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} |
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pos[0] += .5*ourview.hresolu; |
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pos[1] += .5*ourview.vresolu; |
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if (pos[0] < 0 || pos[0] > ourview.hresolu |
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|| pos[1] < 0 || pos[1] > ourview.vresolu) |
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continue; |
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/* check current value at pos */ |
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xpos = pos[0]; |
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ypos = pos[1]; |
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if (zscan(ypos)[xpos] <= 0.0 |
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|| zscan(ypos)[xpos] - pos[2] |
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> zeps*zscan(ypos)[xpos]) { |
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zscan(ypos)[xpos] = pos[2]; |
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copycolr(pscan(ypos)[xpos], pline[x]); |
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} |
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} |
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} |
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|
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|
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fillpicture() /* fill in empty spaces */ |
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{ |
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int *yback, xback; |
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int y; |
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COLR pfill; |
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register int x, i; |
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/* get back buffer */ |
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yback = (int *)malloc(ourview.hresolu*sizeof(int)); |
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if (yback == NULL) { |
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perror(progname); |
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return; |
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} |
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for (x = 0; x < ourview.hresolu; x++) |
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yback[x] = -2; |
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/* fill image */ |
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for (y = 0; y < ourview.vresolu; y++) { |
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xback = -2; |
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for (x = 0; x < ourview.hresolu; x++) |
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if (zscan(y)[x] <= 0.0) { /* empty pixel */ |
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if (yback[x] == -2) { |
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for (i = y+1; i < ourview.vresolu; i++) |
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if (zscan(i)[x] > 0.0) |
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break; |
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if (i < ourview.vresolu |
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&& (y <= 0 || zscan(y-1)[x] < zscan(i)[x])) |
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yback[x] = i; |
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else |
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yback[x] = y-1; |
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} |
| 336 |
if (xback == -2) { |
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for (i = x+1; x < ourview.hresolu; i++) |
| 338 |
if (zscan(y)[i] > 0.0) |
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break; |
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if (i < ourview.hresolu |
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&& (x <= 0 || zscan(y)[x-1] < zscan(y)[i])) |
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xback = i; |
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else |
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xback = x-1; |
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} |
| 346 |
if (xback < 0 && yback[x] < 0) |
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continue; |
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if (yback[x] < 0 || ABS(x-xback) <= 1 |
| 349 |
|| ( ABS(y-yback[x]) > 1 |
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&& zscan(yback[x])[x] < zscan(y)[xback] )) |
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copycolr(pscan(y)[x],pscan(y)[xback]); |
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else |
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copycolr(pscan(y)[x],pscan(yback[x])[x]); |
| 354 |
} else { /* full pixel */ |
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yback[x] = -2; |
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xback = -2; |
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} |
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} |
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free((char *)yback); |
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} |
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|
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|
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writepicture() /* write out picture */ |
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{ |
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int y; |
| 366 |
|
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fputresolu(YMAJOR|YDECR, ourview.hresolu, ourview.vresolu, stdout); |
| 368 |
for (y = ourview.vresolu-1; y >= 0; y--) |
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if (fwritecolrs(pscan(y), ourview.hresolu, stdout) < 0) { |
| 370 |
perror(progname); |
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exit(1); |
| 372 |
} |
| 373 |
} |
