| 1 |
greg |
1.1 |
#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 |
greg |
1.3 |
#define ABS(x) ((x)>0?(x):-(x)) |
| 21 |
|
|
|
| 22 |
greg |
1.1 |
VIEW ourview = STDVIEW(512); /* desired view */ |
| 23 |
|
|
|
| 24 |
greg |
1.8 |
double zeps = .02; /* allowed z epsilon */ |
| 25 |
greg |
1.1 |
|
| 26 |
|
|
COLR *ourpict; /* output picture */ |
| 27 |
|
|
float *ourzbuf; /* corresponding z-buffer */ |
| 28 |
|
|
|
| 29 |
|
|
char *progname; |
| 30 |
|
|
|
| 31 |
|
|
VIEW theirview = STDVIEW(512); /* input view */ |
| 32 |
|
|
int gotview; /* got input view? */ |
| 33 |
|
|
|
| 34 |
greg |
1.5 |
double theirs2ours[4][4]; /* transformation matrix */ |
| 35 |
greg |
1.10 |
int regdist = 0; /* regular distance? */ |
| 36 |
greg |
1.1 |
|
| 37 |
greg |
1.5 |
|
| 38 |
greg |
1.1 |
main(argc, argv) /* interpolate pictures */ |
| 39 |
|
|
int argc; |
| 40 |
|
|
char *argv[]; |
| 41 |
|
|
{ |
| 42 |
|
|
#define check(olen,narg) if (argv[i][olen] || narg >= argc-i) goto badopt |
| 43 |
|
|
int gotvfile = 0; |
| 44 |
|
|
char *err; |
| 45 |
|
|
int i; |
| 46 |
|
|
|
| 47 |
|
|
progname = argv[0]; |
| 48 |
|
|
|
| 49 |
|
|
for (i = 1; i < argc && argv[i][0] == '-'; i++) |
| 50 |
|
|
switch (argv[i][1]) { |
| 51 |
|
|
case 't': /* threshold */ |
| 52 |
|
|
check(2,1); |
| 53 |
|
|
zeps = atof(argv[++i]); |
| 54 |
|
|
break; |
| 55 |
greg |
1.10 |
case 'r': /* regular distance */ |
| 56 |
|
|
check(2,0); |
| 57 |
|
|
regdist = !regdist; |
| 58 |
|
|
break; |
| 59 |
greg |
1.6 |
case 'x': /* x resolution */ |
| 60 |
|
|
check(2,1); |
| 61 |
|
|
ourview.hresolu = atoi(argv[++i]); |
| 62 |
|
|
break; |
| 63 |
|
|
case 'y': /* y resolution */ |
| 64 |
|
|
check(2,1); |
| 65 |
|
|
ourview.vresolu = atoi(argv[++i]); |
| 66 |
|
|
break; |
| 67 |
greg |
1.1 |
case 'v': /* view */ |
| 68 |
|
|
switch (argv[i][2]) { |
| 69 |
|
|
case 't': /* type */ |
| 70 |
|
|
check(4,0); |
| 71 |
|
|
ourview.type = argv[i][3]; |
| 72 |
|
|
break; |
| 73 |
|
|
case 'p': /* point */ |
| 74 |
|
|
check(3,3); |
| 75 |
|
|
ourview.vp[0] = atof(argv[++i]); |
| 76 |
|
|
ourview.vp[1] = atof(argv[++i]); |
| 77 |
|
|
ourview.vp[2] = atof(argv[++i]); |
| 78 |
|
|
break; |
| 79 |
|
|
case 'd': /* direction */ |
| 80 |
|
|
check(3,3); |
| 81 |
|
|
ourview.vdir[0] = atof(argv[++i]); |
| 82 |
|
|
ourview.vdir[1] = atof(argv[++i]); |
| 83 |
|
|
ourview.vdir[2] = atof(argv[++i]); |
| 84 |
|
|
break; |
| 85 |
|
|
case 'u': /* up */ |
| 86 |
|
|
check(3,3); |
| 87 |
|
|
ourview.vup[0] = atof(argv[++i]); |
| 88 |
|
|
ourview.vup[1] = atof(argv[++i]); |
| 89 |
|
|
ourview.vup[2] = atof(argv[++i]); |
| 90 |
|
|
break; |
| 91 |
|
|
case 'h': /* horizontal */ |
| 92 |
|
|
check(3,1); |
| 93 |
|
|
ourview.horiz = atof(argv[++i]); |
| 94 |
|
|
break; |
| 95 |
|
|
case 'v': /* vertical */ |
| 96 |
|
|
check(3,1); |
| 97 |
|
|
ourview.vert = atof(argv[++i]); |
| 98 |
|
|
break; |
| 99 |
|
|
case 'f': /* file */ |
| 100 |
|
|
check(3,1); |
| 101 |
|
|
gotvfile = viewfile(argv[++i], &ourview); |
| 102 |
|
|
if (gotvfile < 0) { |
| 103 |
|
|
perror(argv[i]); |
| 104 |
|
|
exit(1); |
| 105 |
|
|
} else if (gotvfile == 0) { |
| 106 |
|
|
fprintf(stderr, "%s: bad view file\n", |
| 107 |
|
|
argv[i]); |
| 108 |
|
|
exit(1); |
| 109 |
|
|
} |
| 110 |
|
|
break; |
| 111 |
|
|
default: |
| 112 |
|
|
goto badopt; |
| 113 |
|
|
} |
| 114 |
|
|
break; |
| 115 |
|
|
default: |
| 116 |
|
|
badopt: |
| 117 |
greg |
1.10 |
fprintf(stderr, "%s: command line error at '%s'\n", |
| 118 |
greg |
1.1 |
progname, argv[i]); |
| 119 |
greg |
1.10 |
goto userr; |
| 120 |
greg |
1.1 |
} |
| 121 |
|
|
/* check arguments */ |
| 122 |
greg |
1.10 |
if (argc-i < 2 || (argc-i)%2) |
| 123 |
|
|
goto userr; |
| 124 |
greg |
1.1 |
/* set view */ |
| 125 |
|
|
if (err = setview(&ourview)) { |
| 126 |
|
|
fprintf(stderr, "%s: %s\n", progname, err); |
| 127 |
|
|
exit(1); |
| 128 |
|
|
} |
| 129 |
|
|
/* allocate frame */ |
| 130 |
|
|
ourpict = (COLR *)calloc(ourview.hresolu*ourview.vresolu,sizeof(COLR)); |
| 131 |
|
|
ourzbuf = (float *)calloc(ourview.hresolu*ourview.vresolu,sizeof(float)); |
| 132 |
|
|
if (ourpict == NULL || ourzbuf == NULL) { |
| 133 |
|
|
perror(progname); |
| 134 |
|
|
exit(1); |
| 135 |
|
|
} |
| 136 |
|
|
/* get input */ |
| 137 |
|
|
for ( ; i < argc; i += 2) |
| 138 |
|
|
addpicture(argv[i], argv[i+1]); |
| 139 |
|
|
/* fill in spaces */ |
| 140 |
|
|
fillpicture(); |
| 141 |
|
|
/* add to header */ |
| 142 |
|
|
printargs(argc, argv, stdout); |
| 143 |
|
|
if (gotvfile) { |
| 144 |
|
|
printf(VIEWSTR); |
| 145 |
|
|
fprintview(&ourview, stdout); |
| 146 |
|
|
printf("\n"); |
| 147 |
|
|
} |
| 148 |
|
|
printf("\n"); |
| 149 |
|
|
/* write output */ |
| 150 |
|
|
writepicture(); |
| 151 |
|
|
|
| 152 |
|
|
exit(0); |
| 153 |
greg |
1.10 |
userr: |
| 154 |
|
|
fprintf(stderr, |
| 155 |
|
|
"Usage: %s [view opts][-t zthresh][-r] pfile zspec ..\n", |
| 156 |
|
|
progname); |
| 157 |
|
|
exit(1); |
| 158 |
greg |
1.1 |
#undef check |
| 159 |
|
|
} |
| 160 |
|
|
|
| 161 |
|
|
|
| 162 |
|
|
headline(s) /* process header string */ |
| 163 |
|
|
char *s; |
| 164 |
|
|
{ |
| 165 |
|
|
static char *altname[] = {"rview","rpict","pinterp",VIEWSTR,NULL}; |
| 166 |
|
|
register char **an; |
| 167 |
|
|
|
| 168 |
|
|
printf("\t%s", s); |
| 169 |
|
|
|
| 170 |
|
|
for (an = altname; *an != NULL; an++) |
| 171 |
|
|
if (!strncmp(*an, s, strlen(*an))) { |
| 172 |
|
|
if (sscanview(&theirview, s+strlen(*an)) == 0) |
| 173 |
|
|
gotview++; |
| 174 |
|
|
break; |
| 175 |
|
|
} |
| 176 |
|
|
} |
| 177 |
|
|
|
| 178 |
|
|
|
| 179 |
greg |
1.10 |
addpicture(pfile, zspec) /* add picture to output */ |
| 180 |
|
|
char *pfile, *zspec; |
| 181 |
greg |
1.1 |
{ |
| 182 |
greg |
1.10 |
extern double atof(); |
| 183 |
greg |
1.1 |
FILE *pfp, *zfp; |
| 184 |
greg |
1.8 |
char *err; |
| 185 |
greg |
1.1 |
COLR *scanin; |
| 186 |
greg |
1.9 |
float *zin, *zlast; |
| 187 |
|
|
int *plast; |
| 188 |
greg |
1.1 |
int y; |
| 189 |
greg |
1.10 |
/* open picture file */ |
| 190 |
greg |
1.1 |
if ((pfp = fopen(pfile, "r")) == NULL) { |
| 191 |
|
|
perror(pfile); |
| 192 |
|
|
exit(1); |
| 193 |
|
|
} |
| 194 |
|
|
/* get header and view */ |
| 195 |
|
|
printf("%s:\n", pfile); |
| 196 |
|
|
gotview = 0; |
| 197 |
|
|
getheader(pfp, headline); |
| 198 |
greg |
1.9 |
if (!gotview || fgetresolu(&theirview.hresolu, &theirview.vresolu, pfp) |
| 199 |
|
|
!= (YMAJOR|YDECR)) { |
| 200 |
greg |
1.1 |
fprintf(stderr, "%s: picture view error\n", pfile); |
| 201 |
|
|
exit(1); |
| 202 |
|
|
} |
| 203 |
|
|
if (err = setview(&theirview)) { |
| 204 |
|
|
fprintf(stderr, "%s: %s\n", pfile, err); |
| 205 |
|
|
exit(1); |
| 206 |
|
|
} |
| 207 |
greg |
1.5 |
/* compute transformation */ |
| 208 |
|
|
pixform(theirs2ours, &theirview, &ourview); |
| 209 |
greg |
1.1 |
/* allocate scanlines */ |
| 210 |
greg |
1.9 |
scanin = (COLR *)malloc(theirview.hresolu*sizeof(COLR)); |
| 211 |
|
|
zin = (float *)malloc(theirview.hresolu*sizeof(float)); |
| 212 |
greg |
1.10 |
plast = (int *)calloc(theirview.hresolu, sizeof(int)); |
| 213 |
greg |
1.9 |
zlast = (float *)calloc(theirview.hresolu, sizeof(float)); |
| 214 |
greg |
1.10 |
if (scanin == NULL || zin == NULL || plast == NULL || zlast == NULL) { |
| 215 |
greg |
1.1 |
perror(progname); |
| 216 |
|
|
exit(1); |
| 217 |
|
|
} |
| 218 |
greg |
1.10 |
/* get z specification or file */ |
| 219 |
|
|
if ((zfp = fopen(zspec, "r")) == NULL) { |
| 220 |
|
|
double zvalue; |
| 221 |
|
|
register int x; |
| 222 |
|
|
if (!isfloat(zspec) || (zvalue = atof(zspec)) <= 0.0) { |
| 223 |
|
|
perror(zspec); |
| 224 |
|
|
exit(1); |
| 225 |
|
|
} |
| 226 |
|
|
for (x = 0; x < theirview.hresolu; x++) |
| 227 |
|
|
zin[x] = zvalue; |
| 228 |
|
|
} |
| 229 |
greg |
1.1 |
/* load image */ |
| 230 |
greg |
1.9 |
for (y = theirview.vresolu-1; y >= 0; y--) { |
| 231 |
|
|
if (freadcolrs(scanin, theirview.hresolu, pfp) < 0) { |
| 232 |
greg |
1.1 |
fprintf(stderr, "%s: read error\n", pfile); |
| 233 |
|
|
exit(1); |
| 234 |
|
|
} |
| 235 |
greg |
1.10 |
if (zfp != NULL |
| 236 |
|
|
&& fread(zin,sizeof(float),theirview.hresolu,zfp) |
| 237 |
greg |
1.9 |
< theirview.hresolu) { |
| 238 |
greg |
1.10 |
fprintf(stderr, "%s: read error\n", zspec); |
| 239 |
greg |
1.1 |
exit(1); |
| 240 |
|
|
} |
| 241 |
greg |
1.9 |
addscanline(y, scanin, zin, plast, zlast); |
| 242 |
greg |
1.1 |
} |
| 243 |
|
|
/* clean up */ |
| 244 |
|
|
free((char *)scanin); |
| 245 |
|
|
free((char *)zin); |
| 246 |
greg |
1.9 |
free((char *)plast); |
| 247 |
|
|
free((char *)zlast); |
| 248 |
greg |
1.1 |
fclose(pfp); |
| 249 |
greg |
1.10 |
if (zfp != NULL) |
| 250 |
|
|
fclose(zfp); |
| 251 |
greg |
1.1 |
} |
| 252 |
|
|
|
| 253 |
|
|
|
| 254 |
greg |
1.5 |
pixform(xfmat, vw1, vw2) /* compute view1 to view2 matrix */ |
| 255 |
|
|
register double xfmat[4][4]; |
| 256 |
|
|
register VIEW *vw1, *vw2; |
| 257 |
|
|
{ |
| 258 |
|
|
double m4t[4][4]; |
| 259 |
|
|
|
| 260 |
|
|
setident4(xfmat); |
| 261 |
|
|
xfmat[0][0] = vw1->vhinc[0]; |
| 262 |
|
|
xfmat[0][1] = vw1->vhinc[1]; |
| 263 |
|
|
xfmat[0][2] = vw1->vhinc[2]; |
| 264 |
|
|
xfmat[1][0] = vw1->vvinc[0]; |
| 265 |
|
|
xfmat[1][1] = vw1->vvinc[1]; |
| 266 |
|
|
xfmat[1][2] = vw1->vvinc[2]; |
| 267 |
|
|
xfmat[2][0] = vw1->vdir[0]; |
| 268 |
|
|
xfmat[2][1] = vw1->vdir[1]; |
| 269 |
|
|
xfmat[2][2] = vw1->vdir[2]; |
| 270 |
|
|
xfmat[3][0] = vw1->vp[0]; |
| 271 |
|
|
xfmat[3][1] = vw1->vp[1]; |
| 272 |
|
|
xfmat[3][2] = vw1->vp[2]; |
| 273 |
|
|
setident4(m4t); |
| 274 |
|
|
m4t[0][0] = vw2->vhinc[0]/vw2->vhn2; |
| 275 |
|
|
m4t[1][0] = vw2->vhinc[1]/vw2->vhn2; |
| 276 |
|
|
m4t[2][0] = vw2->vhinc[2]/vw2->vhn2; |
| 277 |
|
|
m4t[3][0] = -DOT(vw2->vp,vw2->vhinc)/vw2->vhn2; |
| 278 |
|
|
m4t[0][1] = vw2->vvinc[0]/vw2->vvn2; |
| 279 |
|
|
m4t[1][1] = vw2->vvinc[1]/vw2->vvn2; |
| 280 |
|
|
m4t[2][1] = vw2->vvinc[2]/vw2->vvn2; |
| 281 |
|
|
m4t[3][1] = -DOT(vw2->vp,vw2->vvinc)/vw2->vvn2; |
| 282 |
|
|
m4t[0][2] = vw2->vdir[0]; |
| 283 |
|
|
m4t[1][2] = vw2->vdir[1]; |
| 284 |
|
|
m4t[2][2] = vw2->vdir[2]; |
| 285 |
|
|
m4t[3][2] = -DOT(vw2->vp,vw2->vdir); |
| 286 |
|
|
multmat4(xfmat, xfmat, m4t); |
| 287 |
|
|
} |
| 288 |
|
|
|
| 289 |
|
|
|
| 290 |
greg |
1.8 |
addscanline(y, pline, zline, lasty, lastyz) /* add scanline to output */ |
| 291 |
greg |
1.1 |
int y; |
| 292 |
|
|
COLR *pline; |
| 293 |
|
|
float *zline; |
| 294 |
greg |
1.9 |
int *lasty; /* input/output */ |
| 295 |
|
|
float *lastyz; /* input/output */ |
| 296 |
greg |
1.1 |
{ |
| 297 |
greg |
1.8 |
extern double sqrt(), fabs(); |
| 298 |
greg |
1.5 |
double pos[3]; |
| 299 |
greg |
1.8 |
int lastx = 0; |
| 300 |
|
|
double lastxz = 0; |
| 301 |
|
|
double zt; |
| 302 |
|
|
int xpos, ypos; |
| 303 |
greg |
1.1 |
register int x; |
| 304 |
|
|
|
| 305 |
greg |
1.8 |
for (x = theirview.hresolu-1; x >= 0; x--) { |
| 306 |
greg |
1.5 |
pos[0] = x - .5*(theirview.hresolu-1); |
| 307 |
|
|
pos[1] = y - .5*(theirview.vresolu-1); |
| 308 |
|
|
pos[2] = zline[x]; |
| 309 |
|
|
if (theirview.type == VT_PER) { |
| 310 |
greg |
1.10 |
if (!regdist) /* adjust for eye-ray distance */ |
| 311 |
|
|
pos[2] /= sqrt( 1. |
| 312 |
greg |
1.5 |
+ pos[0]*pos[0]*theirview.vhn2 |
| 313 |
|
|
+ pos[1]*pos[1]*theirview.vvn2 ); |
| 314 |
|
|
pos[0] *= pos[2]; |
| 315 |
|
|
pos[1] *= pos[2]; |
| 316 |
|
|
} |
| 317 |
|
|
multp3(pos, pos, theirs2ours); |
| 318 |
greg |
1.8 |
if (pos[2] <= 0) |
| 319 |
greg |
1.1 |
continue; |
| 320 |
greg |
1.5 |
if (ourview.type == VT_PER) { |
| 321 |
|
|
pos[0] /= pos[2]; |
| 322 |
|
|
pos[1] /= pos[2]; |
| 323 |
|
|
} |
| 324 |
|
|
pos[0] += .5*ourview.hresolu; |
| 325 |
|
|
pos[1] += .5*ourview.vresolu; |
| 326 |
greg |
1.8 |
if (pos[0] < 0 || (xpos = pos[0]) >= ourview.hresolu |
| 327 |
|
|
|| pos[1] < 0 || (ypos = pos[1]) >= ourview.vresolu) |
| 328 |
greg |
1.5 |
continue; |
| 329 |
greg |
1.8 |
/* add pixel to our image */ |
| 330 |
|
|
zt = 2.*zeps*zline[x]; |
| 331 |
|
|
addpixel(xpos, ypos, |
| 332 |
|
|
(fabs(zline[x]-lastxz) <= zt) ? lastx - xpos : 1, |
| 333 |
|
|
(fabs(zline[x]-lastyz[x]) <= zt) ? lasty[x] - ypos : 1, |
| 334 |
|
|
pline[x], pos[2]); |
| 335 |
|
|
lastx = xpos; |
| 336 |
|
|
lasty[x] = ypos; |
| 337 |
|
|
lastxz = lastyz[x] = zline[x]; |
| 338 |
greg |
1.1 |
} |
| 339 |
|
|
} |
| 340 |
|
|
|
| 341 |
|
|
|
| 342 |
greg |
1.8 |
addpixel(xstart, ystart, width, height, pix, z) /* fill in area for pixel */ |
| 343 |
|
|
int xstart, ystart; |
| 344 |
|
|
int width, height; |
| 345 |
|
|
COLR pix; |
| 346 |
|
|
double z; |
| 347 |
|
|
{ |
| 348 |
|
|
register int x, y; |
| 349 |
|
|
/* make width and height positive */ |
| 350 |
|
|
if (width < 0) { |
| 351 |
|
|
width = -width; |
| 352 |
|
|
xstart = xstart-width+1; |
| 353 |
|
|
} else if (width == 0) |
| 354 |
|
|
width = 1; |
| 355 |
|
|
if (height < 0) { |
| 356 |
|
|
height = -height; |
| 357 |
|
|
ystart = ystart-height+1; |
| 358 |
|
|
} else if (height == 0) |
| 359 |
|
|
height = 1; |
| 360 |
|
|
/* fill pixel(s) within rectangle */ |
| 361 |
|
|
for (y = ystart; y < ystart+height; y++) |
| 362 |
|
|
for (x = xstart; x < xstart+width; x++) |
| 363 |
|
|
if (zscan(y)[x] <= 0 |
| 364 |
|
|
|| zscan(y)[x]-z > zeps*zscan(y)[x]) { |
| 365 |
|
|
zscan(y)[x] = z; |
| 366 |
|
|
copycolr(pscan(y)[x], pix); |
| 367 |
|
|
} |
| 368 |
|
|
} |
| 369 |
|
|
|
| 370 |
|
|
|
| 371 |
greg |
1.1 |
fillpicture() /* fill in empty spaces */ |
| 372 |
|
|
{ |
| 373 |
greg |
1.2 |
int *yback, xback; |
| 374 |
greg |
1.1 |
int y; |
| 375 |
greg |
1.2 |
COLR pfill; |
| 376 |
|
|
register int x, i; |
| 377 |
|
|
/* get back buffer */ |
| 378 |
|
|
yback = (int *)malloc(ourview.hresolu*sizeof(int)); |
| 379 |
|
|
if (yback == NULL) { |
| 380 |
|
|
perror(progname); |
| 381 |
|
|
return; |
| 382 |
|
|
} |
| 383 |
|
|
for (x = 0; x < ourview.hresolu; x++) |
| 384 |
greg |
1.4 |
yback[x] = -2; |
| 385 |
greg |
1.7 |
/* |
| 386 |
|
|
* Xback and yback are the pixel locations of suitable |
| 387 |
|
|
* background values in each direction. |
| 388 |
|
|
* A value of -2 means unassigned, and -1 means |
| 389 |
|
|
* that there is no suitable background in this direction. |
| 390 |
|
|
*/ |
| 391 |
greg |
1.2 |
/* fill image */ |
| 392 |
greg |
1.4 |
for (y = 0; y < ourview.vresolu; y++) { |
| 393 |
|
|
xback = -2; |
| 394 |
greg |
1.1 |
for (x = 0; x < ourview.hresolu; x++) |
| 395 |
greg |
1.8 |
if (zscan(y)[x] <= 0) { /* empty pixel */ |
| 396 |
greg |
1.7 |
/* |
| 397 |
|
|
* First, find background from above or below. |
| 398 |
|
|
* (farthest assigned pixel) |
| 399 |
|
|
*/ |
| 400 |
greg |
1.4 |
if (yback[x] == -2) { |
| 401 |
|
|
for (i = y+1; i < ourview.vresolu; i++) |
| 402 |
greg |
1.8 |
if (zscan(i)[x] > 0) |
| 403 |
greg |
1.4 |
break; |
| 404 |
|
|
if (i < ourview.vresolu |
| 405 |
greg |
1.2 |
&& (y <= 0 || zscan(y-1)[x] < zscan(i)[x])) |
| 406 |
greg |
1.4 |
yback[x] = i; |
| 407 |
|
|
else |
| 408 |
|
|
yback[x] = y-1; |
| 409 |
greg |
1.2 |
} |
| 410 |
greg |
1.7 |
/* |
| 411 |
|
|
* Next, find background from left or right. |
| 412 |
|
|
*/ |
| 413 |
greg |
1.4 |
if (xback == -2) { |
| 414 |
|
|
for (i = x+1; x < ourview.hresolu; i++) |
| 415 |
greg |
1.8 |
if (zscan(y)[i] > 0) |
| 416 |
greg |
1.4 |
break; |
| 417 |
|
|
if (i < ourview.hresolu |
| 418 |
|
|
&& (x <= 0 || zscan(y)[x-1] < zscan(y)[i])) |
| 419 |
|
|
xback = i; |
| 420 |
|
|
else |
| 421 |
|
|
xback = x-1; |
| 422 |
|
|
} |
| 423 |
|
|
if (xback < 0 && yback[x] < 0) |
| 424 |
greg |
1.7 |
continue; /* no background */ |
| 425 |
|
|
/* |
| 426 |
|
|
* Compare, and use the background that is |
| 427 |
|
|
* farther, unless one of them is next to us. |
| 428 |
|
|
*/ |
| 429 |
greg |
1.4 |
if (yback[x] < 0 || ABS(x-xback) <= 1 |
| 430 |
|
|
|| ( ABS(y-yback[x]) > 1 |
| 431 |
|
|
&& zscan(yback[x])[x] < zscan(y)[xback] )) |
| 432 |
|
|
copycolr(pscan(y)[x],pscan(y)[xback]); |
| 433 |
|
|
else |
| 434 |
|
|
copycolr(pscan(y)[x],pscan(yback[x])[x]); |
| 435 |
|
|
} else { /* full pixel */ |
| 436 |
|
|
yback[x] = -2; |
| 437 |
|
|
xback = -2; |
| 438 |
|
|
} |
| 439 |
|
|
} |
| 440 |
greg |
1.2 |
free((char *)yback); |
| 441 |
greg |
1.1 |
} |
| 442 |
|
|
|
| 443 |
|
|
|
| 444 |
|
|
writepicture() /* write out picture */ |
| 445 |
|
|
{ |
| 446 |
|
|
int y; |
| 447 |
|
|
|
| 448 |
|
|
fputresolu(YMAJOR|YDECR, ourview.hresolu, ourview.vresolu, stdout); |
| 449 |
|
|
for (y = ourview.vresolu-1; y >= 0; y--) |
| 450 |
|
|
if (fwritecolrs(pscan(y), ourview.hresolu, stdout) < 0) { |
| 451 |
|
|
perror(progname); |
| 452 |
|
|
exit(1); |
| 453 |
|
|
} |
| 454 |
greg |
1.10 |
} |
| 455 |
|
|
|
| 456 |
|
|
|
| 457 |
|
|
isfloat(s) /* see if string is floating number */ |
| 458 |
|
|
register char *s; |
| 459 |
|
|
{ |
| 460 |
|
|
for ( ; *s; s++) |
| 461 |
|
|
if ((*s < '0' || *s > '9') && *s != '.' && *s != '-' |
| 462 |
|
|
&& *s != 'e' && *s != 'E' && *s != '+') |
| 463 |
|
|
return(0); |
| 464 |
|
|
return(1); |
| 465 |
greg |
1.1 |
} |
