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greg |
1.1 |
#ifndef lint
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static char SCCSid[] = "$SunId$ LBL";
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#endif
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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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#include "standard.h"
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#include "view.h"
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#include "color.h"
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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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greg |
1.3 |
#define ABS(x) ((x)>0?(x):-(x))
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greg |
1.1 |
VIEW ourview = STDVIEW(512); /* desired view */
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double zeps = 0.001; /* allowed z epsilon */
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COLR *ourpict; /* output picture */
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float *ourzbuf; /* corresponding z-buffer */
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char *progname;
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VIEW theirview = STDVIEW(512); /* input view */
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int gotview; /* got input view? */
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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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progname = argv[0];
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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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exit(0);
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#undef check
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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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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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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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/* 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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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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FVECT p, dir;
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double xnew, ynew, znew;
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register int x;
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register int xpos, ypos;
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for (x = 0; x < theirview.hresolu; x++) {
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rayview(p, dir, &theirview, x+.5, y+.5);
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p[0] += zline[x]*dir[0];
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p[1] += zline[x]*dir[1];
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p[2] += zline[x]*dir[2];
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pixelview(&xnew, &ynew, &znew, &ourview, p);
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if (znew <= 0.0 || xnew < 0 || xnew > ourview.hresolu
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|| ynew < 0 || ynew > ourview.vresolu)
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continue;
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/* check current value at position */
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xpos = xnew;
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ypos = ynew;
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if (zscan(ypos)[xpos] <= 0.0
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|| zscan(ypos)[xpos] - znew
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> zeps*zscan(ypos)[xpos]) {
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zscan(ypos)[xpos] = znew;
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copycolr(pscan(ypos)[xpos], pline[x]);
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}
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}
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| 250 |
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}
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| 253 |
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fillpicture() /* fill in empty spaces */
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| 254 |
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{
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greg |
1.2 |
int *yback, xback;
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| 256 |
greg |
1.1 |
int y;
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| 257 |
greg |
1.2 |
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] = -1;
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/* fill image */
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| 268 |
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for (y = 0; y < ourview.vresolu; y++)
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greg |
1.1 |
for (x = 0; x < ourview.hresolu; x++)
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greg |
1.2 |
if (zscan(y)[x] <= 0.0) { /* found hole */
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xback = x-1;
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do { /* find boundary */
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if (yback[x] < 0) {
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for (i = y+1;
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i < ourview.vresolu;
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i++)
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if (zscan(i)[x] > 0.0)
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break;
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| 279 |
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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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| 281 |
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yback[x] = i;
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else
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| 283 |
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yback[x] = y-1;
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| 284 |
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}
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| 285 |
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} while (++x < ourview.hresolu
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| 286 |
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&& zscan(y)[x] <= 0.0);
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| 287 |
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i = xback; /* pick background */
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| 288 |
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if (x < ourview.hresolu
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| 289 |
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&& (i < 0 || zscan(y)[i] < zscan(y)[x]))
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| 290 |
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xback = x;
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| 291 |
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/* fill hole */
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| 292 |
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if (xback < 0) {
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| 293 |
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while (++i < x)
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| 294 |
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if (yback[i] >= 0)
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| 295 |
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copycolr(pscan(y)[i],pscan(yback[i])[i]);
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| 296 |
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} else {
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| 297 |
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while (++i < x)
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| 298 |
greg |
1.3 |
if (yback[i] < 0
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| 299 |
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|| ABS(i-xback) <= 1 || (ABS(y-yback[i]) > 1
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| 300 |
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&& zscan(yback[i])[i] < zscan(y)[xback]))
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| 301 |
greg |
1.2 |
copycolr(pscan(y)[i],pscan(y)[xback]);
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| 302 |
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else
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| 303 |
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copycolr(pscan(y)[i],pscan(yback[i])[i]);
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| 304 |
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}
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| 305 |
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} else
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| 306 |
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yback[x] = -1; /* clear boundary */
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| 307 |
|
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free((char *)yback);
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| 308 |
greg |
1.1 |
}
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| 309 |
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| 310 |
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| 311 |
|
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writepicture() /* write out picture */
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| 312 |
|
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{
|
| 313 |
|
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int y;
|
| 314 |
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|
| 315 |
|
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fputresolu(YMAJOR|YDECR, ourview.hresolu, ourview.vresolu, stdout);
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| 316 |
|
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for (y = ourview.vresolu-1; y >= 0; y--)
|
| 317 |
|
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if (fwritecolrs(pscan(y), ourview.hresolu, stdout) < 0) {
|
| 318 |
|
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perror(progname);
|
| 319 |
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exit(1);
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| 320 |
|
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}
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| 321 |
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}
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