| 1 |
/* Copyright (c) 1996 Regents of the University of California */ |
| 2 |
|
| 3 |
#ifndef lint |
| 4 |
static char SCCSid[] = "$SunId$ LBL"; |
| 5 |
#endif |
| 6 |
|
| 7 |
/* |
| 8 |
* data.c - routines dealing with interpolated data. |
| 9 |
*/ |
| 10 |
|
| 11 |
#include "standard.h" |
| 12 |
|
| 13 |
#include "color.h" |
| 14 |
|
| 15 |
#include "resolu.h" |
| 16 |
|
| 17 |
#include "data.h" |
| 18 |
|
| 19 |
/* picture memory usage before warning */ |
| 20 |
#ifndef PSIZWARN |
| 21 |
#ifdef BIGMEM |
| 22 |
#define PSIZWARN 5000000 |
| 23 |
#else |
| 24 |
#define PSIZWARN 1500000 |
| 25 |
#endif |
| 26 |
#endif |
| 27 |
|
| 28 |
#ifndef TABSIZ |
| 29 |
#define TABSIZ 97 /* table size (prime) */ |
| 30 |
#endif |
| 31 |
|
| 32 |
#define hash(s) (shash(s)%TABSIZ) |
| 33 |
|
| 34 |
|
| 35 |
extern char *getlibpath(); /* library search path */ |
| 36 |
|
| 37 |
static DATARRAY *dtab[TABSIZ]; /* data array list */ |
| 38 |
|
| 39 |
|
| 40 |
DATARRAY * |
| 41 |
getdata(dname) /* get data array dname */ |
| 42 |
char *dname; |
| 43 |
{ |
| 44 |
char *dfname; |
| 45 |
FILE *fp; |
| 46 |
int asize; |
| 47 |
register int i, j; |
| 48 |
register DATARRAY *dp; |
| 49 |
/* look for array in list */ |
| 50 |
for (dp = dtab[hash(dname)]; dp != NULL; dp = dp->next) |
| 51 |
if (!strcmp(dname, dp->name)) |
| 52 |
return(dp); /* found! */ |
| 53 |
|
| 54 |
/* |
| 55 |
* If we haven't loaded the data already, we will look |
| 56 |
* for it in the directories specified by the library path. |
| 57 |
* |
| 58 |
* The file has the following format: |
| 59 |
* |
| 60 |
* N |
| 61 |
* beg0 end0 n0 |
| 62 |
* beg1 end1 n1 |
| 63 |
* . . . |
| 64 |
* begN endN nN |
| 65 |
* data, later dimensions changing faster |
| 66 |
* . . . |
| 67 |
* |
| 68 |
* For irregularly spaced points, the following can be |
| 69 |
* substituted for begi endi ni: |
| 70 |
* |
| 71 |
* 0 0 ni p0i p1i .. pni |
| 72 |
*/ |
| 73 |
|
| 74 |
if ((dfname = getpath(dname, getlibpath(), R_OK)) == NULL) { |
| 75 |
sprintf(errmsg, "cannot find data file \"%s\"", dname); |
| 76 |
error(USER, errmsg); |
| 77 |
} |
| 78 |
if ((fp = fopen(dfname, "r")) == NULL) { |
| 79 |
sprintf(errmsg, "cannot open data file \"%s\"", dfname); |
| 80 |
error(SYSTEM, errmsg); |
| 81 |
} |
| 82 |
/* get dimensions */ |
| 83 |
if (fgetval(fp, 'i', &asize) <= 0) |
| 84 |
goto scanerr; |
| 85 |
if (asize <= 0 | asize > MAXDDIM) { |
| 86 |
sprintf(errmsg, "bad number of dimensions for \"%s\"", dname); |
| 87 |
error(USER, errmsg); |
| 88 |
} |
| 89 |
if ((dp = (DATARRAY *)malloc(sizeof(DATARRAY))) == NULL) |
| 90 |
goto memerr; |
| 91 |
dp->name = savestr(dname); |
| 92 |
dp->type = DATATY; |
| 93 |
dp->nd = asize; |
| 94 |
asize = 1; |
| 95 |
for (i = 0; i < dp->nd; i++) { |
| 96 |
if (fgetval(fp, DATATY, &dp->dim[i].org) <= 0) |
| 97 |
goto scanerr; |
| 98 |
if (fgetval(fp, DATATY, &dp->dim[i].siz) <= 0) |
| 99 |
goto scanerr; |
| 100 |
if (fgetval(fp, 'i', &dp->dim[i].ne) <= 0) |
| 101 |
goto scanerr; |
| 102 |
if (dp->dim[i].ne < 2) |
| 103 |
goto scanerr; |
| 104 |
asize *= dp->dim[i].ne; |
| 105 |
if ((dp->dim[i].siz -= dp->dim[i].org) == 0) { |
| 106 |
dp->dim[i].p = (DATATYPE *) |
| 107 |
malloc(dp->dim[i].ne*sizeof(DATATYPE)); |
| 108 |
if (dp->dim[i].p == NULL) |
| 109 |
goto memerr; |
| 110 |
for (j = 0; j < dp->dim[i].ne; j++) |
| 111 |
if (fgetval(fp, DATATY, &dp->dim[i].p[j]) <= 0) |
| 112 |
goto scanerr; |
| 113 |
for (j = 1; j < dp->dim[i].ne-1; j++) |
| 114 |
if ((dp->dim[i].p[j-1] < dp->dim[i].p[j]) != |
| 115 |
(dp->dim[i].p[j] < dp->dim[i].p[j+1])) |
| 116 |
goto scanerr; |
| 117 |
dp->dim[i].org = dp->dim[i].p[0]; |
| 118 |
dp->dim[i].siz = dp->dim[i].p[dp->dim[i].ne-1] |
| 119 |
- dp->dim[i].p[0]; |
| 120 |
} else |
| 121 |
dp->dim[i].p = NULL; |
| 122 |
} |
| 123 |
if ((dp->arr.d = (DATATYPE *)malloc(asize*sizeof(DATATYPE))) == NULL) |
| 124 |
goto memerr; |
| 125 |
|
| 126 |
for (i = 0; i < asize; i++) |
| 127 |
if (fgetval(fp, DATATY, &dp->arr.d[i]) <= 0) |
| 128 |
goto scanerr; |
| 129 |
fclose(fp); |
| 130 |
i = hash(dname); |
| 131 |
dp->next = dtab[i]; |
| 132 |
return(dtab[i] = dp); |
| 133 |
|
| 134 |
memerr: |
| 135 |
error(SYSTEM, "out of memory in getdata"); |
| 136 |
scanerr: |
| 137 |
sprintf(errmsg, "%s in data file \"%s\"", |
| 138 |
feof(fp) ? "unexpected EOF" : "bad format", dfname); |
| 139 |
error(USER, errmsg); |
| 140 |
} |
| 141 |
|
| 142 |
|
| 143 |
static |
| 144 |
headaspect(s, iap) /* check string for aspect ratio */ |
| 145 |
char *s; |
| 146 |
double *iap; |
| 147 |
{ |
| 148 |
char fmt[32]; |
| 149 |
|
| 150 |
if (isaspect(s)) |
| 151 |
*iap *= aspectval(s); |
| 152 |
else if (formatval(fmt, s) && strcmp(fmt, COLRFMT)) |
| 153 |
*iap = 0.0; |
| 154 |
return(0); |
| 155 |
} |
| 156 |
|
| 157 |
|
| 158 |
DATARRAY * |
| 159 |
getpict(pname) /* get picture pname */ |
| 160 |
char *pname; |
| 161 |
{ |
| 162 |
double inpaspect; |
| 163 |
char *pfname; |
| 164 |
FILE *fp; |
| 165 |
COLR *scanin; |
| 166 |
int sl, ns; |
| 167 |
RESOLU inpres; |
| 168 |
FLOAT loc[2]; |
| 169 |
int y; |
| 170 |
register int x, i; |
| 171 |
register DATARRAY *pp; |
| 172 |
/* look for array in list */ |
| 173 |
for (pp = dtab[hash(pname)]; pp != NULL; pp = pp->next) |
| 174 |
if (!strcmp(pname, pp->name)) |
| 175 |
return(pp); /* found! */ |
| 176 |
|
| 177 |
if ((pfname = getpath(pname, getlibpath(), R_OK)) == NULL) { |
| 178 |
sprintf(errmsg, "cannot find picture file \"%s\"", pname); |
| 179 |
error(USER, errmsg); |
| 180 |
} |
| 181 |
if ((pp = (DATARRAY *)malloc(3*sizeof(DATARRAY))) == NULL) |
| 182 |
goto memerr; |
| 183 |
|
| 184 |
pp[0].name = savestr(pname); |
| 185 |
|
| 186 |
if ((fp = fopen(pfname, "r")) == NULL) { |
| 187 |
sprintf(errmsg, "cannot open picture file \"%s\"", pfname); |
| 188 |
error(SYSTEM, errmsg); |
| 189 |
} |
| 190 |
#ifdef MSDOS |
| 191 |
setmode(fileno(fp), O_BINARY); |
| 192 |
#endif |
| 193 |
/* get dimensions */ |
| 194 |
inpaspect = 1.0; |
| 195 |
getheader(fp, headaspect, &inpaspect); |
| 196 |
if (inpaspect <= FTINY || !fgetsresolu(&inpres, fp)) |
| 197 |
goto readerr; |
| 198 |
pp[0].nd = 2; |
| 199 |
pp[0].dim[0].ne = inpres.yr; |
| 200 |
pp[0].dim[1].ne = inpres.xr; |
| 201 |
pp[0].dim[0].org = |
| 202 |
pp[0].dim[1].org = 0.0; |
| 203 |
if (inpres.xr <= inpres.yr*inpaspect) { |
| 204 |
pp[0].dim[0].siz = inpaspect * |
| 205 |
(double)inpres.yr/inpres.xr; |
| 206 |
pp[0].dim[1].siz = 1.0; |
| 207 |
} else { |
| 208 |
pp[0].dim[0].siz = 1.0; |
| 209 |
pp[0].dim[1].siz = (double)inpres.xr/inpres.yr / |
| 210 |
inpaspect; |
| 211 |
} |
| 212 |
pp[0].dim[0].p = pp[0].dim[1].p = NULL; |
| 213 |
sl = scanlen(&inpres); /* allocate array */ |
| 214 |
ns = numscans(&inpres); |
| 215 |
i = ns*sl*sizeof(COLR); |
| 216 |
#if PSIZWARN |
| 217 |
if (i > PSIZWARN) { /* memory warning */ |
| 218 |
sprintf(errmsg, "picture file \"%s\" using %d bytes of memory", |
| 219 |
pname, i); |
| 220 |
error(WARNING, errmsg); |
| 221 |
} |
| 222 |
#endif |
| 223 |
if ((pp[0].arr.c = (COLR *)malloc(i)) == NULL) |
| 224 |
goto memerr; |
| 225 |
/* load picture */ |
| 226 |
if ((scanin = (COLR *)malloc(sl*sizeof(COLR))) == NULL) |
| 227 |
goto memerr; |
| 228 |
for (y = 0; y < ns; y++) { |
| 229 |
if (freadcolrs(scanin, sl, fp) < 0) |
| 230 |
goto readerr; |
| 231 |
for (x = 0; x < sl; x++) { |
| 232 |
pix2loc(loc, &inpres, x, y); |
| 233 |
i = (int)(loc[1]*inpres.yr)*inpres.xr + |
| 234 |
(int)(loc[0]*inpres.xr); |
| 235 |
copycolr(pp[0].arr.c[i], scanin[x]); |
| 236 |
} |
| 237 |
} |
| 238 |
free((char *)scanin); |
| 239 |
fclose(fp); |
| 240 |
i = hash(pname); |
| 241 |
pp[0].next = dtab[i]; /* link into picture list */ |
| 242 |
copystruct(&pp[1], &pp[0]); |
| 243 |
copystruct(&pp[2], &pp[0]); |
| 244 |
pp[0].type = RED; /* differentiate RGB records */ |
| 245 |
pp[1].type = GRN; |
| 246 |
pp[2].type = BLU; |
| 247 |
return(dtab[i] = pp); |
| 248 |
|
| 249 |
memerr: |
| 250 |
error(SYSTEM, "out of memory in getpict"); |
| 251 |
readerr: |
| 252 |
sprintf(errmsg, "bad picture file \"%s\"", pfname); |
| 253 |
error(USER, errmsg); |
| 254 |
} |
| 255 |
|
| 256 |
|
| 257 |
freedata(dname) /* free memory associated with dname */ |
| 258 |
char *dname; |
| 259 |
{ |
| 260 |
DATARRAY head; |
| 261 |
int hval, nents; |
| 262 |
register DATARRAY *dp, *dpl; |
| 263 |
register int i; |
| 264 |
|
| 265 |
if (dname == NULL) { /* free all if NULL */ |
| 266 |
hval = 0; nents = TABSIZ; |
| 267 |
} else { |
| 268 |
hval = hash(dname); nents = 1; |
| 269 |
} |
| 270 |
while (nents--) { |
| 271 |
head.next = dtab[hval]; |
| 272 |
dpl = &head; |
| 273 |
while ((dp = dpl->next) != NULL) |
| 274 |
if (dname == NULL || !strcmp(dname, dp->name)) { |
| 275 |
dpl->next = dp->next; |
| 276 |
if (dp->type == DATATY) |
| 277 |
free((char *)dp->arr.d); |
| 278 |
else |
| 279 |
free((char *)dp->arr.c); |
| 280 |
for (i = 0; i < dp->nd; i++) |
| 281 |
if (dp->dim[i].p != NULL) |
| 282 |
free((char *)dp->dim[i].p); |
| 283 |
freestr(dp->name); |
| 284 |
free((char *)dp); |
| 285 |
} else |
| 286 |
dpl = dp; |
| 287 |
dtab[hval++] = head.next; |
| 288 |
} |
| 289 |
} |
| 290 |
|
| 291 |
|
| 292 |
double |
| 293 |
datavalue(dp, pt) /* interpolate data value at a point */ |
| 294 |
register DATARRAY *dp; |
| 295 |
double *pt; |
| 296 |
{ |
| 297 |
DATARRAY sd; |
| 298 |
int asize; |
| 299 |
int lower, upper; |
| 300 |
register int i; |
| 301 |
double x, y0, y1; |
| 302 |
/* set up dimensions for recursion */ |
| 303 |
if (dp->nd > 1) { |
| 304 |
sd.name = dp->name; |
| 305 |
sd.type = dp->type; |
| 306 |
sd.nd = dp->nd - 1; |
| 307 |
asize = 1; |
| 308 |
for (i = 0; i < sd.nd; i++) { |
| 309 |
sd.dim[i].org = dp->dim[i+1].org; |
| 310 |
sd.dim[i].siz = dp->dim[i+1].siz; |
| 311 |
sd.dim[i].p = dp->dim[i+1].p; |
| 312 |
asize *= sd.dim[i].ne = dp->dim[i+1].ne; |
| 313 |
} |
| 314 |
} |
| 315 |
/* get independent variable */ |
| 316 |
if (dp->dim[0].p == NULL) { /* evenly spaced points */ |
| 317 |
x = (pt[0] - dp->dim[0].org)/dp->dim[0].siz; |
| 318 |
x *= (double)(dp->dim[0].ne - 1); |
| 319 |
i = x; |
| 320 |
if (i < 0) |
| 321 |
i = 0; |
| 322 |
else if (i > dp->dim[0].ne - 2) |
| 323 |
i = dp->dim[0].ne - 2; |
| 324 |
} else { /* unevenly spaced points */ |
| 325 |
if (dp->dim[0].siz > 0.0) { |
| 326 |
lower = 0; |
| 327 |
upper = dp->dim[0].ne; |
| 328 |
} else { |
| 329 |
lower = dp->dim[0].ne; |
| 330 |
upper = 0; |
| 331 |
} |
| 332 |
do { |
| 333 |
i = (lower + upper) >> 1; |
| 334 |
if (pt[0] >= dp->dim[0].p[i]) |
| 335 |
lower = i; |
| 336 |
else |
| 337 |
upper = i; |
| 338 |
} while (i != (lower + upper) >> 1); |
| 339 |
if (i > dp->dim[0].ne - 2) |
| 340 |
i = dp->dim[0].ne - 2; |
| 341 |
x = i + (pt[0] - dp->dim[0].p[i]) / |
| 342 |
(dp->dim[0].p[i+1] - dp->dim[0].p[i]); |
| 343 |
} |
| 344 |
/* get dependent variable */ |
| 345 |
if (dp->nd > 1) { |
| 346 |
if (dp->type == DATATY) { |
| 347 |
sd.arr.d = dp->arr.d + i*asize; |
| 348 |
y0 = datavalue(&sd, pt+1); |
| 349 |
sd.arr.d = dp->arr.d + (i+1)*asize; |
| 350 |
y1 = datavalue(&sd, pt+1); |
| 351 |
} else { |
| 352 |
sd.arr.c = dp->arr.c + i*asize; |
| 353 |
y0 = datavalue(&sd, pt+1); |
| 354 |
sd.arr.c = dp->arr.c + (i+1)*asize; |
| 355 |
y1 = datavalue(&sd, pt+1); |
| 356 |
} |
| 357 |
} else { |
| 358 |
if (dp->type == DATATY) { |
| 359 |
y0 = dp->arr.d[i]; |
| 360 |
y1 = dp->arr.d[i+1]; |
| 361 |
} else { |
| 362 |
y0 = colrval(dp->arr.c[i],dp->type); |
| 363 |
y1 = colrval(dp->arr.c[i+1],dp->type); |
| 364 |
} |
| 365 |
} |
| 366 |
/* |
| 367 |
* Extrapolate as far as one division, then |
| 368 |
* taper off harmonically to zero. |
| 369 |
*/ |
| 370 |
if (x > i+2) |
| 371 |
return( (2*y1-y0)/(x-(i-1)) ); |
| 372 |
|
| 373 |
if (x < i-1) |
| 374 |
return( (2*y0-y1)/(i-x) ); |
| 375 |
|
| 376 |
return( y0*((i+1)-x) + y1*(x-i) ); |
| 377 |
} |
