| 1 |
greg |
1.1 |
#ifndef lint |
| 2 |
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static char SCCSid[] = "$SunId$ LBL"; |
| 3 |
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#endif |
| 4 |
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| 5 |
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/* |
| 6 |
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* Interpolate and extrapolate pictures with different view parameters. |
| 7 |
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* |
| 8 |
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* Greg Ward 09Dec89 |
| 9 |
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*/ |
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| 11 |
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#include "standard.h" |
| 12 |
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| 13 |
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#include "view.h" |
| 14 |
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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) |
| 19 |
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| 20 |
greg |
1.3 |
#define ABS(x) ((x)>0?(x):-(x)) |
| 21 |
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| 22 |
greg |
1.1 |
VIEW ourview = STDVIEW(512); /* desired view */ |
| 23 |
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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 */ |
| 28 |
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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 */ |
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greg |
1.1 |
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greg |
1.5 |
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greg |
1.1 |
main(argc, argv) /* interpolate pictures */ |
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int argc; |
| 39 |
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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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greg |
1.6 |
case 'x': /* x resolution */ |
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check(2,1); |
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ourview.hresolu = atoi(argv[++i]); |
| 57 |
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break; |
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case 'y': /* y resolution */ |
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check(2,1); |
| 60 |
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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]); |
| 78 |
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ourview.vdir[2] = atof(argv[++i]); |
| 79 |
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break; |
| 80 |
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case 'u': /* up */ |
| 81 |
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check(3,3); |
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ourview.vup[0] = atof(argv[++i]); |
| 83 |
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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 */ |
| 87 |
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check(3,1); |
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ourview.horiz = atof(argv[++i]); |
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break; |
| 90 |
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case 'v': /* vertical */ |
| 91 |
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check(3,1); |
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ourview.vert = atof(argv[++i]); |
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break; |
| 94 |
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case 'f': /* file */ |
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check(3,1); |
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gotvfile = viewfile(argv[++i], &ourview); |
| 97 |
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if (gotvfile < 0) { |
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perror(argv[i]); |
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exit(1); |
| 100 |
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} else if (gotvfile == 0) { |
| 101 |
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fprintf(stderr, "%s: bad view file\n", |
| 102 |
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argv[i]); |
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exit(1); |
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} |
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break; |
| 106 |
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default: |
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goto badopt; |
| 108 |
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} |
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break; |
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default: |
| 111 |
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badopt: |
| 112 |
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fprintf(stderr, "%s: unknown option '%s'\n", |
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progname, argv[i]); |
| 114 |
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exit(1); |
| 115 |
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} |
| 116 |
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/* check arguments */ |
| 117 |
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if (argc-i < 2 || (argc-i)%2) { |
| 118 |
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fprintf(stderr, "Usage: %s [view args] pfile zfile ..\n", |
| 119 |
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progname); |
| 120 |
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exit(1); |
| 121 |
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} |
| 122 |
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/* set view */ |
| 123 |
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if (err = setview(&ourview)) { |
| 124 |
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fprintf(stderr, "%s: %s\n", progname, err); |
| 125 |
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exit(1); |
| 126 |
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} |
| 127 |
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/* allocate frame */ |
| 128 |
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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)); |
| 130 |
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if (ourpict == NULL || ourzbuf == NULL) { |
| 131 |
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perror(progname); |
| 132 |
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exit(1); |
| 133 |
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} |
| 134 |
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/* get input */ |
| 135 |
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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 */ |
| 138 |
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fillpicture(); |
| 139 |
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/* add to header */ |
| 140 |
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printargs(argc, argv, stdout); |
| 141 |
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if (gotvfile) { |
| 142 |
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printf(VIEWSTR); |
| 143 |
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fprintview(&ourview, stdout); |
| 144 |
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printf("\n"); |
| 145 |
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} |
| 146 |
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printf("\n"); |
| 147 |
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/* write output */ |
| 148 |
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writepicture(); |
| 149 |
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| 150 |
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exit(0); |
| 151 |
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#undef check |
| 152 |
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} |
| 153 |
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| 154 |
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| 155 |
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headline(s) /* process header string */ |
| 156 |
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char *s; |
| 157 |
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{ |
| 158 |
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static char *altname[] = {"rview","rpict","pinterp",VIEWSTR,NULL}; |
| 159 |
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register char **an; |
| 160 |
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printf("\t%s", s); |
| 162 |
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| 163 |
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for (an = altname; *an != NULL; an++) |
| 164 |
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if (!strncmp(*an, s, strlen(*an))) { |
| 165 |
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if (sscanview(&theirview, s+strlen(*an)) == 0) |
| 166 |
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gotview++; |
| 167 |
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break; |
| 168 |
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} |
| 169 |
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} |
| 170 |
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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; |
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greg |
1.8 |
char *err; |
| 177 |
greg |
1.1 |
COLR *scanin; |
| 178 |
greg |
1.9 |
float *zin, *zlast; |
| 179 |
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int *plast; |
| 180 |
greg |
1.1 |
int y; |
| 181 |
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/* open input files */ |
| 182 |
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if ((pfp = fopen(pfile, "r")) == NULL) { |
| 183 |
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perror(pfile); |
| 184 |
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exit(1); |
| 185 |
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} |
| 186 |
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if ((zfp = fopen(zfile, "r")) == NULL) { |
| 187 |
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perror(zfile); |
| 188 |
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exit(1); |
| 189 |
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} |
| 190 |
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/* get header and view */ |
| 191 |
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printf("%s:\n", pfile); |
| 192 |
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gotview = 0; |
| 193 |
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getheader(pfp, headline); |
| 194 |
greg |
1.9 |
if (!gotview || fgetresolu(&theirview.hresolu, &theirview.vresolu, pfp) |
| 195 |
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!= (YMAJOR|YDECR)) { |
| 196 |
greg |
1.1 |
fprintf(stderr, "%s: picture view error\n", pfile); |
| 197 |
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exit(1); |
| 198 |
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} |
| 199 |
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if (err = setview(&theirview)) { |
| 200 |
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fprintf(stderr, "%s: %s\n", pfile, err); |
| 201 |
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exit(1); |
| 202 |
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} |
| 203 |
greg |
1.5 |
/* compute transformation */ |
| 204 |
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pixform(theirs2ours, &theirview, &ourview); |
| 205 |
greg |
1.1 |
/* allocate scanlines */ |
| 206 |
greg |
1.9 |
scanin = (COLR *)malloc(theirview.hresolu*sizeof(COLR)); |
| 207 |
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zin = (float *)malloc(theirview.hresolu*sizeof(float)); |
| 208 |
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zlast = (float *)calloc(theirview.hresolu, sizeof(float)); |
| 209 |
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plast = (int *)calloc(theirview.hresolu, sizeof(int)); |
| 210 |
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if (scanin == NULL || zin == NULL || zlast == NULL || plast == NULL) { |
| 211 |
greg |
1.1 |
perror(progname); |
| 212 |
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exit(1); |
| 213 |
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} |
| 214 |
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/* load image */ |
| 215 |
greg |
1.9 |
for (y = theirview.vresolu-1; y >= 0; y--) { |
| 216 |
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if (freadcolrs(scanin, theirview.hresolu, pfp) < 0) { |
| 217 |
greg |
1.1 |
fprintf(stderr, "%s: read error\n", pfile); |
| 218 |
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exit(1); |
| 219 |
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} |
| 220 |
greg |
1.9 |
if (fread(zin, sizeof(float), theirview.hresolu, zfp) |
| 221 |
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< theirview.hresolu) { |
| 222 |
greg |
1.1 |
fprintf(stderr, "%s: read error\n", zfile); |
| 223 |
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exit(1); |
| 224 |
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} |
| 225 |
greg |
1.9 |
addscanline(y, scanin, zin, plast, zlast); |
| 226 |
greg |
1.1 |
} |
| 227 |
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/* clean up */ |
| 228 |
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free((char *)scanin); |
| 229 |
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free((char *)zin); |
| 230 |
greg |
1.9 |
free((char *)plast); |
| 231 |
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free((char *)zlast); |
| 232 |
greg |
1.1 |
fclose(pfp); |
| 233 |
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fclose(zfp); |
| 234 |
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} |
| 235 |
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| 236 |
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| 237 |
greg |
1.5 |
pixform(xfmat, vw1, vw2) /* compute view1 to view2 matrix */ |
| 238 |
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register double xfmat[4][4]; |
| 239 |
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register VIEW *vw1, *vw2; |
| 240 |
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{ |
| 241 |
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double m4t[4][4]; |
| 242 |
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| 243 |
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setident4(xfmat); |
| 244 |
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xfmat[0][0] = vw1->vhinc[0]; |
| 245 |
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xfmat[0][1] = vw1->vhinc[1]; |
| 246 |
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xfmat[0][2] = vw1->vhinc[2]; |
| 247 |
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xfmat[1][0] = vw1->vvinc[0]; |
| 248 |
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xfmat[1][1] = vw1->vvinc[1]; |
| 249 |
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xfmat[1][2] = vw1->vvinc[2]; |
| 250 |
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xfmat[2][0] = vw1->vdir[0]; |
| 251 |
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xfmat[2][1] = vw1->vdir[1]; |
| 252 |
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xfmat[2][2] = vw1->vdir[2]; |
| 253 |
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xfmat[3][0] = vw1->vp[0]; |
| 254 |
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xfmat[3][1] = vw1->vp[1]; |
| 255 |
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xfmat[3][2] = vw1->vp[2]; |
| 256 |
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setident4(m4t); |
| 257 |
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m4t[0][0] = vw2->vhinc[0]/vw2->vhn2; |
| 258 |
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m4t[1][0] = vw2->vhinc[1]/vw2->vhn2; |
| 259 |
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m4t[2][0] = vw2->vhinc[2]/vw2->vhn2; |
| 260 |
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m4t[3][0] = -DOT(vw2->vp,vw2->vhinc)/vw2->vhn2; |
| 261 |
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m4t[0][1] = vw2->vvinc[0]/vw2->vvn2; |
| 262 |
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m4t[1][1] = vw2->vvinc[1]/vw2->vvn2; |
| 263 |
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m4t[2][1] = vw2->vvinc[2]/vw2->vvn2; |
| 264 |
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m4t[3][1] = -DOT(vw2->vp,vw2->vvinc)/vw2->vvn2; |
| 265 |
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m4t[0][2] = vw2->vdir[0]; |
| 266 |
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m4t[1][2] = vw2->vdir[1]; |
| 267 |
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m4t[2][2] = vw2->vdir[2]; |
| 268 |
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m4t[3][2] = -DOT(vw2->vp,vw2->vdir); |
| 269 |
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multmat4(xfmat, xfmat, m4t); |
| 270 |
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} |
| 271 |
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| 272 |
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| 273 |
greg |
1.8 |
addscanline(y, pline, zline, lasty, lastyz) /* add scanline to output */ |
| 274 |
greg |
1.1 |
int y; |
| 275 |
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COLR *pline; |
| 276 |
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float *zline; |
| 277 |
greg |
1.9 |
int *lasty; /* input/output */ |
| 278 |
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float *lastyz; /* input/output */ |
| 279 |
greg |
1.1 |
{ |
| 280 |
greg |
1.8 |
extern double sqrt(), fabs(); |
| 281 |
greg |
1.5 |
double pos[3]; |
| 282 |
greg |
1.8 |
int lastx = 0; |
| 283 |
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double lastxz = 0; |
| 284 |
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double zt; |
| 285 |
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int xpos, ypos; |
| 286 |
greg |
1.1 |
register int x; |
| 287 |
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|
| 288 |
greg |
1.8 |
for (x = theirview.hresolu-1; x >= 0; x--) { |
| 289 |
greg |
1.5 |
pos[0] = x - .5*(theirview.hresolu-1); |
| 290 |
|
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pos[1] = y - .5*(theirview.vresolu-1); |
| 291 |
|
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pos[2] = zline[x]; |
| 292 |
|
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if (theirview.type == VT_PER) { |
| 293 |
greg |
1.8 |
/* |
| 294 |
|
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* The following (single) statement can go |
| 295 |
|
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* if z is along the view direction rather |
| 296 |
|
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* than an eye ray. |
| 297 |
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*/ |
| 298 |
greg |
1.5 |
pos[2] /= sqrt( 1. |
| 299 |
|
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+ pos[0]*pos[0]*theirview.vhn2 |
| 300 |
|
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+ pos[1]*pos[1]*theirview.vvn2 ); |
| 301 |
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pos[0] *= pos[2]; |
| 302 |
|
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pos[1] *= pos[2]; |
| 303 |
|
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} |
| 304 |
|
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multp3(pos, pos, theirs2ours); |
| 305 |
greg |
1.8 |
if (pos[2] <= 0) |
| 306 |
greg |
1.1 |
continue; |
| 307 |
greg |
1.5 |
if (ourview.type == VT_PER) { |
| 308 |
|
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pos[0] /= pos[2]; |
| 309 |
|
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pos[1] /= pos[2]; |
| 310 |
|
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} |
| 311 |
|
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pos[0] += .5*ourview.hresolu; |
| 312 |
|
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pos[1] += .5*ourview.vresolu; |
| 313 |
greg |
1.8 |
if (pos[0] < 0 || (xpos = pos[0]) >= ourview.hresolu |
| 314 |
|
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|| pos[1] < 0 || (ypos = pos[1]) >= ourview.vresolu) |
| 315 |
greg |
1.5 |
continue; |
| 316 |
greg |
1.8 |
/* add pixel to our image */ |
| 317 |
|
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zt = 2.*zeps*zline[x]; |
| 318 |
|
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addpixel(xpos, ypos, |
| 319 |
|
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(fabs(zline[x]-lastxz) <= zt) ? lastx - xpos : 1, |
| 320 |
|
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(fabs(zline[x]-lastyz[x]) <= zt) ? lasty[x] - ypos : 1, |
| 321 |
|
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pline[x], pos[2]); |
| 322 |
|
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lastx = xpos; |
| 323 |
|
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lasty[x] = ypos; |
| 324 |
|
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lastxz = lastyz[x] = zline[x]; |
| 325 |
greg |
1.1 |
} |
| 326 |
|
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} |
| 327 |
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| 328 |
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| 329 |
greg |
1.8 |
addpixel(xstart, ystart, width, height, pix, z) /* fill in area for pixel */ |
| 330 |
|
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int xstart, ystart; |
| 331 |
|
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int width, height; |
| 332 |
|
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COLR pix; |
| 333 |
|
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double z; |
| 334 |
|
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{ |
| 335 |
|
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register int x, y; |
| 336 |
|
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/* make width and height positive */ |
| 337 |
|
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if (width < 0) { |
| 338 |
|
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width = -width; |
| 339 |
|
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xstart = xstart-width+1; |
| 340 |
|
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} else if (width == 0) |
| 341 |
|
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width = 1; |
| 342 |
|
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if (height < 0) { |
| 343 |
|
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height = -height; |
| 344 |
|
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ystart = ystart-height+1; |
| 345 |
|
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} else if (height == 0) |
| 346 |
|
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height = 1; |
| 347 |
|
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/* fill pixel(s) within rectangle */ |
| 348 |
|
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for (y = ystart; y < ystart+height; y++) |
| 349 |
|
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for (x = xstart; x < xstart+width; x++) |
| 350 |
|
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if (zscan(y)[x] <= 0 |
| 351 |
|
|
|| zscan(y)[x]-z > zeps*zscan(y)[x]) { |
| 352 |
|
|
zscan(y)[x] = z; |
| 353 |
|
|
copycolr(pscan(y)[x], pix); |
| 354 |
|
|
} |
| 355 |
|
|
} |
| 356 |
|
|
|
| 357 |
|
|
|
| 358 |
greg |
1.1 |
fillpicture() /* fill in empty spaces */ |
| 359 |
|
|
{ |
| 360 |
greg |
1.2 |
int *yback, xback; |
| 361 |
greg |
1.1 |
int y; |
| 362 |
greg |
1.2 |
COLR pfill; |
| 363 |
|
|
register int x, i; |
| 364 |
|
|
/* get back buffer */ |
| 365 |
|
|
yback = (int *)malloc(ourview.hresolu*sizeof(int)); |
| 366 |
|
|
if (yback == NULL) { |
| 367 |
|
|
perror(progname); |
| 368 |
|
|
return; |
| 369 |
|
|
} |
| 370 |
|
|
for (x = 0; x < ourview.hresolu; x++) |
| 371 |
greg |
1.4 |
yback[x] = -2; |
| 372 |
greg |
1.7 |
/* |
| 373 |
|
|
* Xback and yback are the pixel locations of suitable |
| 374 |
|
|
* background values in each direction. |
| 375 |
|
|
* A value of -2 means unassigned, and -1 means |
| 376 |
|
|
* that there is no suitable background in this direction. |
| 377 |
|
|
*/ |
| 378 |
greg |
1.2 |
/* fill image */ |
| 379 |
greg |
1.4 |
for (y = 0; y < ourview.vresolu; y++) { |
| 380 |
|
|
xback = -2; |
| 381 |
greg |
1.1 |
for (x = 0; x < ourview.hresolu; x++) |
| 382 |
greg |
1.8 |
if (zscan(y)[x] <= 0) { /* empty pixel */ |
| 383 |
greg |
1.7 |
/* |
| 384 |
|
|
* First, find background from above or below. |
| 385 |
|
|
* (farthest assigned pixel) |
| 386 |
|
|
*/ |
| 387 |
greg |
1.4 |
if (yback[x] == -2) { |
| 388 |
|
|
for (i = y+1; i < ourview.vresolu; i++) |
| 389 |
greg |
1.8 |
if (zscan(i)[x] > 0) |
| 390 |
greg |
1.4 |
break; |
| 391 |
|
|
if (i < ourview.vresolu |
| 392 |
greg |
1.2 |
&& (y <= 0 || zscan(y-1)[x] < zscan(i)[x])) |
| 393 |
greg |
1.4 |
yback[x] = i; |
| 394 |
|
|
else |
| 395 |
|
|
yback[x] = y-1; |
| 396 |
greg |
1.2 |
} |
| 397 |
greg |
1.7 |
/* |
| 398 |
|
|
* Next, find background from left or right. |
| 399 |
|
|
*/ |
| 400 |
greg |
1.4 |
if (xback == -2) { |
| 401 |
|
|
for (i = x+1; x < ourview.hresolu; i++) |
| 402 |
greg |
1.8 |
if (zscan(y)[i] > 0) |
| 403 |
greg |
1.4 |
break; |
| 404 |
|
|
if (i < ourview.hresolu |
| 405 |
|
|
&& (x <= 0 || zscan(y)[x-1] < zscan(y)[i])) |
| 406 |
|
|
xback = i; |
| 407 |
|
|
else |
| 408 |
|
|
xback = x-1; |
| 409 |
|
|
} |
| 410 |
|
|
if (xback < 0 && yback[x] < 0) |
| 411 |
greg |
1.7 |
continue; /* no background */ |
| 412 |
|
|
/* |
| 413 |
|
|
* Compare, and use the background that is |
| 414 |
|
|
* farther, unless one of them is next to us. |
| 415 |
|
|
*/ |
| 416 |
greg |
1.4 |
if (yback[x] < 0 || ABS(x-xback) <= 1 |
| 417 |
|
|
|| ( ABS(y-yback[x]) > 1 |
| 418 |
|
|
&& zscan(yback[x])[x] < zscan(y)[xback] )) |
| 419 |
|
|
copycolr(pscan(y)[x],pscan(y)[xback]); |
| 420 |
|
|
else |
| 421 |
|
|
copycolr(pscan(y)[x],pscan(yback[x])[x]); |
| 422 |
|
|
} else { /* full pixel */ |
| 423 |
|
|
yback[x] = -2; |
| 424 |
|
|
xback = -2; |
| 425 |
|
|
} |
| 426 |
|
|
} |
| 427 |
greg |
1.2 |
free((char *)yback); |
| 428 |
greg |
1.1 |
} |
| 429 |
|
|
|
| 430 |
|
|
|
| 431 |
|
|
writepicture() /* write out picture */ |
| 432 |
|
|
{ |
| 433 |
|
|
int y; |
| 434 |
|
|
|
| 435 |
|
|
fputresolu(YMAJOR|YDECR, ourview.hresolu, ourview.vresolu, stdout); |
| 436 |
|
|
for (y = ourview.vresolu-1; y >= 0; y--) |
| 437 |
|
|
if (fwritecolrs(pscan(y), ourview.hresolu, stdout) < 0) { |
| 438 |
|
|
perror(progname); |
| 439 |
|
|
exit(1); |
| 440 |
|
|
} |
| 441 |
|
|
} |
