| 1 |
#ifndef lint |
| 2 |
static char SCCSid[] = "$SunId$ LBL"; |
| 3 |
#endif |
| 4 |
|
| 5 |
/* |
| 6 |
* Interpolate and extrapolate pictures with different view parameters. |
| 7 |
* |
| 8 |
* Greg Ward 09Dec89 |
| 9 |
*/ |
| 10 |
|
| 11 |
#include "standard.h" |
| 12 |
|
| 13 |
#include "view.h" |
| 14 |
|
| 15 |
#include "color.h" |
| 16 |
|
| 17 |
#define pscan(y) (ourpict+(y)*ourview.hresolu) |
| 18 |
#define zscan(y) (ourzbuf+(y)*ourview.hresolu) |
| 19 |
|
| 20 |
#define ABS(x) ((x)>0?(x):-(x)) |
| 21 |
|
| 22 |
VIEW ourview = STDVIEW(512); /* desired view */ |
| 23 |
|
| 24 |
double zeps = .02; /* allowed z epsilon */ |
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|
| 26 |
COLR *ourpict; /* output picture */ |
| 27 |
float *ourzbuf; /* corresponding z-buffer */ |
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|
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char *progname; |
| 30 |
|
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VIEW theirview = STDVIEW(512); /* input view */ |
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int gotview; /* got input view? */ |
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|
| 34 |
double theirs2ours[4][4]; /* transformation matrix */ |
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|
| 36 |
|
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main(argc, argv) /* interpolate pictures */ |
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int argc; |
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char *argv[]; |
| 40 |
{ |
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#define check(olen,narg) if (argv[i][olen] || narg >= argc-i) goto badopt |
| 42 |
int gotvfile = 0; |
| 43 |
char *err; |
| 44 |
int i; |
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|
| 46 |
progname = argv[0]; |
| 47 |
|
| 48 |
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 'x': /* x resolution */ |
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check(2,1); |
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ourview.hresolu = atoi(argv[++i]); |
| 57 |
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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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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char *err; |
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COLR *scanin; |
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float *zin, *zout; |
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int *pout; |
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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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zout = (float *)calloc(xres, sizeof(float)); |
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pout = (int *)calloc(xres, sizeof(int)); |
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if (scanin == NULL || zin == NULL || zout == NULL || pout == 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, pout, zout); |
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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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free((char *)pout); |
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free((char *)zout); |
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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; |
| 263 |
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, lasty, lastyz) /* add scanline to output */ |
| 275 |
int y; |
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COLR *pline; |
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float *zline; |
| 278 |
int *lasty; |
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float *lastyz; |
| 280 |
{ |
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extern double sqrt(), fabs(); |
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double pos[3]; |
| 283 |
int lastx = 0; |
| 284 |
double lastxz = 0; |
| 285 |
double zt; |
| 286 |
int xpos, ypos; |
| 287 |
register int x; |
| 288 |
|
| 289 |
for (x = theirview.hresolu-1; x >= 0; x--) { |
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pos[0] = x - .5*(theirview.hresolu-1); |
| 291 |
pos[1] = y - .5*(theirview.vresolu-1); |
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pos[2] = zline[x]; |
| 293 |
if (theirview.type == VT_PER) { |
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/* |
| 295 |
* The following (single) statement can go |
| 296 |
* if z is along the view direction rather |
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* than an eye ray. |
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*/ |
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pos[2] /= sqrt( 1. |
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+ pos[0]*pos[0]*theirview.vhn2 |
| 301 |
+ pos[1]*pos[1]*theirview.vvn2 ); |
| 302 |
pos[0] *= pos[2]; |
| 303 |
pos[1] *= pos[2]; |
| 304 |
} |
| 305 |
multp3(pos, pos, theirs2ours); |
| 306 |
if (pos[2] <= 0) |
| 307 |
continue; |
| 308 |
if (ourview.type == VT_PER) { |
| 309 |
pos[0] /= pos[2]; |
| 310 |
pos[1] /= pos[2]; |
| 311 |
} |
| 312 |
pos[0] += .5*ourview.hresolu; |
| 313 |
pos[1] += .5*ourview.vresolu; |
| 314 |
if (pos[0] < 0 || (xpos = pos[0]) >= ourview.hresolu |
| 315 |
|| pos[1] < 0 || (ypos = pos[1]) >= ourview.vresolu) |
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continue; |
| 317 |
/* add pixel to our image */ |
| 318 |
zt = 2.*zeps*zline[x]; |
| 319 |
addpixel(xpos, ypos, |
| 320 |
(fabs(zline[x]-lastxz) <= zt) ? lastx - xpos : 1, |
| 321 |
(fabs(zline[x]-lastyz[x]) <= zt) ? lasty[x] - ypos : 1, |
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pline[x], pos[2]); |
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lastx = xpos; |
| 324 |
lasty[x] = ypos; |
| 325 |
lastxz = lastyz[x] = zline[x]; |
| 326 |
} |
| 327 |
} |
| 328 |
|
| 329 |
|
| 330 |
addpixel(xstart, ystart, width, height, pix, z) /* fill in area for pixel */ |
| 331 |
int xstart, ystart; |
| 332 |
int width, height; |
| 333 |
COLR pix; |
| 334 |
double z; |
| 335 |
{ |
| 336 |
register int x, y; |
| 337 |
/* make width and height positive */ |
| 338 |
if (width < 0) { |
| 339 |
width = -width; |
| 340 |
xstart = xstart-width+1; |
| 341 |
} else if (width == 0) |
| 342 |
width = 1; |
| 343 |
if (height < 0) { |
| 344 |
height = -height; |
| 345 |
ystart = ystart-height+1; |
| 346 |
} else if (height == 0) |
| 347 |
height = 1; |
| 348 |
/* fill pixel(s) within rectangle */ |
| 349 |
for (y = ystart; y < ystart+height; y++) |
| 350 |
for (x = xstart; x < xstart+width; x++) |
| 351 |
if (zscan(y)[x] <= 0 |
| 352 |
|| zscan(y)[x]-z > zeps*zscan(y)[x]) { |
| 353 |
zscan(y)[x] = z; |
| 354 |
copycolr(pscan(y)[x], pix); |
| 355 |
} |
| 356 |
} |
| 357 |
|
| 358 |
|
| 359 |
fillpicture() /* fill in empty spaces */ |
| 360 |
{ |
| 361 |
int *yback, xback; |
| 362 |
int y; |
| 363 |
COLR pfill; |
| 364 |
register int x, i; |
| 365 |
/* get back buffer */ |
| 366 |
yback = (int *)malloc(ourview.hresolu*sizeof(int)); |
| 367 |
if (yback == NULL) { |
| 368 |
perror(progname); |
| 369 |
return; |
| 370 |
} |
| 371 |
for (x = 0; x < ourview.hresolu; x++) |
| 372 |
yback[x] = -2; |
| 373 |
/* |
| 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 |
/* fill image */ |
| 380 |
for (y = 0; y < ourview.vresolu; y++) { |
| 381 |
xback = -2; |
| 382 |
for (x = 0; x < ourview.hresolu; x++) |
| 383 |
if (zscan(y)[x] <= 0) { /* empty pixel */ |
| 384 |
/* |
| 385 |
* First, find background from above or below. |
| 386 |
* (farthest assigned pixel) |
| 387 |
*/ |
| 388 |
if (yback[x] == -2) { |
| 389 |
for (i = y+1; i < ourview.vresolu; i++) |
| 390 |
if (zscan(i)[x] > 0) |
| 391 |
break; |
| 392 |
if (i < ourview.vresolu |
| 393 |
&& (y <= 0 || zscan(y-1)[x] < zscan(i)[x])) |
| 394 |
yback[x] = i; |
| 395 |
else |
| 396 |
yback[x] = y-1; |
| 397 |
} |
| 398 |
/* |
| 399 |
* Next, find background from left or right. |
| 400 |
*/ |
| 401 |
if (xback == -2) { |
| 402 |
for (i = x+1; x < ourview.hresolu; i++) |
| 403 |
if (zscan(y)[i] > 0) |
| 404 |
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 |
continue; /* no background */ |
| 413 |
/* |
| 414 |
* Compare, and use the background that is |
| 415 |
* farther, unless one of them is next to us. |
| 416 |
*/ |
| 417 |
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 |
free((char *)yback); |
| 429 |
} |
| 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 |
} |
