| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: cmatrix.c,v 2.4 2014/05/29 17:28:09 greg Exp $"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* Color matrix routines. |
| 6 |
* |
| 7 |
* G. Ward |
| 8 |
*/ |
| 9 |
|
| 10 |
#include <ctype.h> |
| 11 |
#include "standard.h" |
| 12 |
#include "cmatrix.h" |
| 13 |
#include "platform.h" |
| 14 |
#include "resolu.h" |
| 15 |
|
| 16 |
const char *cm_fmt_id[] = { |
| 17 |
"unknown", "ascii", "float", "double", |
| 18 |
COLRFMT, CIEFMT |
| 19 |
}; |
| 20 |
|
| 21 |
const int cm_elem_size[] = { |
| 22 |
0, 0, 3*sizeof(float), 3*sizeof(double), 4, 4 |
| 23 |
}; |
| 24 |
|
| 25 |
/* Allocate a color coefficient matrix */ |
| 26 |
CMATRIX * |
| 27 |
cm_alloc(int nrows, int ncols) |
| 28 |
{ |
| 29 |
CMATRIX *cm; |
| 30 |
|
| 31 |
if ((nrows <= 0) | (ncols <= 0)) |
| 32 |
error(USER, "attempt to create empty matrix"); |
| 33 |
cm = (CMATRIX *)malloc(sizeof(CMATRIX) + |
| 34 |
sizeof(COLOR)*(nrows*ncols - 1)); |
| 35 |
if (cm == NULL) |
| 36 |
error(SYSTEM, "out of memory in cm_alloc()"); |
| 37 |
cm->nrows = nrows; |
| 38 |
cm->ncols = ncols; |
| 39 |
return(cm); |
| 40 |
} |
| 41 |
|
| 42 |
/* Resize color coefficient matrix */ |
| 43 |
CMATRIX * |
| 44 |
cm_resize(CMATRIX *cm, int nrows) |
| 45 |
{ |
| 46 |
if (nrows == cm->nrows) |
| 47 |
return(cm); |
| 48 |
if (nrows <= 0) { |
| 49 |
cm_free(cm); |
| 50 |
return(NULL); |
| 51 |
} |
| 52 |
cm = (CMATRIX *)realloc(cm, sizeof(CMATRIX) + |
| 53 |
sizeof(COLOR)*(nrows*cm->ncols - 1)); |
| 54 |
if (cm == NULL) |
| 55 |
error(SYSTEM, "out of memory in cm_resize()"); |
| 56 |
cm->nrows = nrows; |
| 57 |
return(cm); |
| 58 |
} |
| 59 |
|
| 60 |
typedef struct { |
| 61 |
int dtype; /* data type */ |
| 62 |
int nrows, ncols; /* matrix size */ |
| 63 |
char *err; /* error message */ |
| 64 |
} CMINFO; /* header info record */ |
| 65 |
|
| 66 |
static int |
| 67 |
get_cminfo(char *s, void *p) |
| 68 |
{ |
| 69 |
CMINFO *ip = (CMINFO *)p; |
| 70 |
char fmt[32]; |
| 71 |
int i; |
| 72 |
|
| 73 |
if (!strncmp(s, "NCOMP=", 6) && atoi(s+6) != 3) { |
| 74 |
ip->err = "unexpected # components (must be 3)"; |
| 75 |
return(-1); |
| 76 |
} |
| 77 |
if (!strncmp(s, "NROWS=", 6)) { |
| 78 |
ip->nrows = atoi(s+6); |
| 79 |
return(0); |
| 80 |
} |
| 81 |
if (!strncmp(s, "NCOLS=", 6)) { |
| 82 |
ip->ncols = atoi(s+6); |
| 83 |
return(0); |
| 84 |
} |
| 85 |
if (!formatval(fmt, s)) |
| 86 |
return(0); |
| 87 |
for (i = 1; i < DTend; i++) |
| 88 |
if (!strcmp(fmt, cm_fmt_id[i])) |
| 89 |
ip->dtype = i; |
| 90 |
return(0); |
| 91 |
} |
| 92 |
|
| 93 |
/* Load header to obtain/check data type and number of columns */ |
| 94 |
char * |
| 95 |
cm_getheader(int *dt, int *nr, int *nc, FILE *fp) |
| 96 |
{ |
| 97 |
CMINFO cmi; |
| 98 |
/* read header */ |
| 99 |
cmi.dtype = DTfromHeader; |
| 100 |
cmi.nrows = cmi.ncols = 0; |
| 101 |
cmi.err = "unexpected EOF in header"; |
| 102 |
if (getheader(fp, &get_cminfo, &cmi) < 0) |
| 103 |
return(cmi.err); |
| 104 |
if (dt != NULL) { /* get/check data type? */ |
| 105 |
if (cmi.dtype == DTfromHeader) { |
| 106 |
if (*dt == DTfromHeader) |
| 107 |
return("missing/unknown data format in header"); |
| 108 |
} else if (*dt == DTfromHeader) |
| 109 |
*dt = cmi.dtype; |
| 110 |
else if (*dt != cmi.dtype) |
| 111 |
return("unexpected data format in header"); |
| 112 |
} |
| 113 |
if (nr != NULL) { /* get/check #rows? */ |
| 114 |
if (*nr <= 0) |
| 115 |
*nr = cmi.nrows; |
| 116 |
else if ((cmi.nrows > 0) & (*nr != cmi.nrows)) |
| 117 |
return("unexpected row count in header"); |
| 118 |
} |
| 119 |
if (nc != NULL) { /* get/check #columns? */ |
| 120 |
if (*nc <= 0) |
| 121 |
*nc = cmi.ncols; |
| 122 |
else if ((cmi.ncols > 0) & (*nc != cmi.ncols)) |
| 123 |
return("unexpected column count in header"); |
| 124 |
} |
| 125 |
return(NULL); |
| 126 |
} |
| 127 |
|
| 128 |
/* Allocate and load a matrix from the given file (or stdin if NULL) */ |
| 129 |
CMATRIX * |
| 130 |
cm_load(const char *fname, int nrows, int ncols, int dtype) |
| 131 |
{ |
| 132 |
FILE *fp = stdin; |
| 133 |
CMATRIX *cm; |
| 134 |
|
| 135 |
if (fname == NULL) |
| 136 |
fname = "<stdin>"; |
| 137 |
else if ((fp = fopen(fname, "r")) == NULL) { |
| 138 |
sprintf(errmsg, "cannot open file '%s'", fname); |
| 139 |
error(SYSTEM, errmsg); |
| 140 |
} |
| 141 |
#ifdef getc_unlocked |
| 142 |
flockfile(fp); |
| 143 |
#endif |
| 144 |
if (dtype != DTascii) |
| 145 |
SET_FILE_BINARY(fp); /* doesn't really work */ |
| 146 |
if (!dtype | !ncols) { /* expecting header? */ |
| 147 |
char *err = cm_getheader(&dtype, &nrows, &ncols, fp); |
| 148 |
if (err != NULL) |
| 149 |
error(USER, err); |
| 150 |
if (ncols <= 0) |
| 151 |
error(USER, "unspecified number of columns"); |
| 152 |
} |
| 153 |
switch (dtype) { |
| 154 |
case DTascii: |
| 155 |
case DTfloat: |
| 156 |
case DTdouble: |
| 157 |
break; |
| 158 |
default: |
| 159 |
error(USER, "unexpected data type in cm_load()"); |
| 160 |
} |
| 161 |
if (nrows <= 0) { /* don't know length? */ |
| 162 |
int guessrows = 147; /* usually big enough */ |
| 163 |
if ((dtype != DTascii) & (fp != stdin)) { |
| 164 |
long startpos = ftell(fp); |
| 165 |
if (fseek(fp, 0L, SEEK_END) == 0) { |
| 166 |
long endpos = ftell(fp); |
| 167 |
long elemsiz = 3*(dtype==DTfloat ? |
| 168 |
sizeof(float) : sizeof(double)); |
| 169 |
|
| 170 |
if ((endpos - startpos) % (ncols*elemsiz)) { |
| 171 |
sprintf(errmsg, |
| 172 |
"improper length for binary file '%s'", |
| 173 |
fname); |
| 174 |
error(USER, errmsg); |
| 175 |
} |
| 176 |
guessrows = (endpos - startpos)/(ncols*elemsiz); |
| 177 |
if (fseek(fp, startpos, SEEK_SET) < 0) { |
| 178 |
sprintf(errmsg, |
| 179 |
"fseek() error on file '%s'", |
| 180 |
fname); |
| 181 |
error(SYSTEM, errmsg); |
| 182 |
} |
| 183 |
nrows = guessrows; /* we're confident */ |
| 184 |
} |
| 185 |
} |
| 186 |
cm = cm_alloc(guessrows, ncols); |
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} else |
| 188 |
cm = cm_alloc(nrows, ncols); |
| 189 |
if (cm == NULL) /* XXX never happens */ |
| 190 |
return(NULL); |
| 191 |
if (dtype == DTascii) { /* read text file */ |
| 192 |
int maxrow = (nrows > 0 ? nrows : 32000); |
| 193 |
int r, c; |
| 194 |
for (r = 0; r < maxrow; r++) { |
| 195 |
if (r >= cm->nrows) /* need more space? */ |
| 196 |
cm = cm_resize(cm, 2*cm->nrows); |
| 197 |
for (c = 0; c < ncols; c++) { |
| 198 |
COLORV *cv = cm_lval(cm,r,c); |
| 199 |
if (fscanf(fp, COLSPEC, cv, cv+1, cv+2) != 3) |
| 200 |
if ((nrows <= 0) & (r > 0) & !c) { |
| 201 |
cm = cm_resize(cm, maxrow=r); |
| 202 |
break; |
| 203 |
} else |
| 204 |
goto EOFerror; |
| 205 |
} |
| 206 |
} |
| 207 |
while ((c = getc(fp)) != EOF) |
| 208 |
if (!isspace(c)) { |
| 209 |
sprintf(errmsg, |
| 210 |
"unexpected data at end of ascii file %s", |
| 211 |
fname); |
| 212 |
error(WARNING, errmsg); |
| 213 |
break; |
| 214 |
} |
| 215 |
} else { /* read binary file */ |
| 216 |
if (sizeof(COLOR) == cm_elem_size[dtype]) { |
| 217 |
int nread = 0; |
| 218 |
do { /* read all we can */ |
| 219 |
nread += fread(cm->cmem + 3*nread, |
| 220 |
sizeof(COLOR), |
| 221 |
cm->nrows*cm->ncols - nread, |
| 222 |
fp); |
| 223 |
if (nrows <= 0) { /* unknown length */ |
| 224 |
if (nread == cm->nrows*cm->ncols) |
| 225 |
/* need more space? */ |
| 226 |
cm = cm_resize(cm, 2*cm->nrows); |
| 227 |
else if (nread && !(nread % cm->ncols)) |
| 228 |
/* seem to be done */ |
| 229 |
cm = cm_resize(cm, nread/cm->ncols); |
| 230 |
else /* ended mid-row */ |
| 231 |
goto EOFerror; |
| 232 |
} else if (nread < cm->nrows*cm->ncols) |
| 233 |
goto EOFerror; |
| 234 |
} while (nread < cm->nrows*cm->ncols); |
| 235 |
|
| 236 |
} else if (dtype == DTdouble) { |
| 237 |
double dc[3]; /* load from double */ |
| 238 |
COLORV *cvp = cm->cmem; |
| 239 |
int n = nrows*ncols; |
| 240 |
|
| 241 |
if (n <= 0) |
| 242 |
goto not_handled; |
| 243 |
while (n--) { |
| 244 |
if (fread(dc, sizeof(double), 3, fp) != 3) |
| 245 |
goto EOFerror; |
| 246 |
copycolor(cvp, dc); |
| 247 |
cvp += 3; |
| 248 |
} |
| 249 |
} else /* dtype == DTfloat */ { |
| 250 |
float fc[3]; /* load from float */ |
| 251 |
COLORV *cvp = cm->cmem; |
| 252 |
int n = nrows*ncols; |
| 253 |
|
| 254 |
if (n <= 0) |
| 255 |
goto not_handled; |
| 256 |
while (n--) { |
| 257 |
if (fread(fc, sizeof(float), 3, fp) != 3) |
| 258 |
goto EOFerror; |
| 259 |
copycolor(cvp, fc); |
| 260 |
cvp += 3; |
| 261 |
} |
| 262 |
} |
| 263 |
if (fgetc(fp) != EOF) { |
| 264 |
sprintf(errmsg, |
| 265 |
"unexpected data at end of binary file %s", |
| 266 |
fname); |
| 267 |
error(WARNING, errmsg); |
| 268 |
} |
| 269 |
} |
| 270 |
if (fp != stdin) |
| 271 |
fclose(fp); |
| 272 |
#ifdef getc_unlocked |
| 273 |
else |
| 274 |
funlockfile(fp); |
| 275 |
#endif |
| 276 |
return(cm); |
| 277 |
EOFerror: |
| 278 |
sprintf(errmsg, "unexpected EOF reading %s", fname); |
| 279 |
error(USER, errmsg); |
| 280 |
not_handled: |
| 281 |
error(INTERNAL, "unhandled data size or length in cm_load()"); |
| 282 |
return(NULL); /* gratis return */ |
| 283 |
} |
| 284 |
|
| 285 |
/* Extract a column vector from a matrix */ |
| 286 |
CMATRIX * |
| 287 |
cm_column(const CMATRIX *cm, int c) |
| 288 |
{ |
| 289 |
CMATRIX *cvr; |
| 290 |
int dr; |
| 291 |
|
| 292 |
if ((c < 0) | (c >= cm->ncols)) |
| 293 |
error(INTERNAL, "column requested outside matrix"); |
| 294 |
cvr = cm_alloc(cm->nrows, 1); |
| 295 |
if (cvr == NULL) |
| 296 |
return(NULL); |
| 297 |
for (dr = 0; dr < cm->nrows; dr++) { |
| 298 |
const COLORV *sp = cm_lval(cm,dr,c); |
| 299 |
COLORV *dp = cv_lval(cvr,dr); |
| 300 |
dp[0] = sp[0]; |
| 301 |
dp[1] = sp[1]; |
| 302 |
dp[2] = sp[2]; |
| 303 |
} |
| 304 |
return(cvr); |
| 305 |
} |
| 306 |
|
| 307 |
/* Scale a matrix by a single value */ |
| 308 |
CMATRIX * |
| 309 |
cm_scale(const CMATRIX *cm1, const COLOR sca) |
| 310 |
{ |
| 311 |
CMATRIX *cmr; |
| 312 |
int dr, dc; |
| 313 |
|
| 314 |
cmr = cm_alloc(cm1->nrows, cm1->ncols); |
| 315 |
if (cmr == NULL) |
| 316 |
return(NULL); |
| 317 |
for (dr = 0; dr < cmr->nrows; dr++) |
| 318 |
for (dc = 0; dc < cmr->ncols; dc++) { |
| 319 |
const COLORV *sp = cm_lval(cm1,dr,dc); |
| 320 |
COLORV *dp = cm_lval(cmr,dr,dc); |
| 321 |
dp[0] = sp[0] * sca[0]; |
| 322 |
dp[1] = sp[1] * sca[1]; |
| 323 |
dp[2] = sp[2] * sca[2]; |
| 324 |
} |
| 325 |
return(cmr); |
| 326 |
} |
| 327 |
|
| 328 |
/* Multiply two matrices (or a matrix and a vector) and allocate the result */ |
| 329 |
CMATRIX * |
| 330 |
cm_multiply(const CMATRIX *cm1, const CMATRIX *cm2) |
| 331 |
{ |
| 332 |
char *rowcheck=NULL, *colcheck=NULL; |
| 333 |
CMATRIX *cmr; |
| 334 |
int dr, dc, i; |
| 335 |
|
| 336 |
if ((cm1->ncols <= 0) | (cm1->ncols != cm2->nrows)) |
| 337 |
error(INTERNAL, "matrix dimension mismatch in cm_multiply()"); |
| 338 |
cmr = cm_alloc(cm1->nrows, cm2->ncols); |
| 339 |
if (cmr == NULL) |
| 340 |
return(NULL); |
| 341 |
/* optimization: check for zero rows & cols */ |
| 342 |
if (((cm1->nrows > 5) | (cm2->ncols > 5)) & (cm1->ncols > 5)) { |
| 343 |
static const COLOR czero; |
| 344 |
rowcheck = (char *)calloc(cmr->nrows, 1); |
| 345 |
for (dr = cm1->nrows*(rowcheck != NULL); dr--; ) |
| 346 |
for (dc = cm1->ncols; dc--; ) |
| 347 |
if (memcmp(cm_lval(cm1,dr,dc), czero, sizeof(COLOR))) { |
| 348 |
rowcheck[dr] = 1; |
| 349 |
break; |
| 350 |
} |
| 351 |
colcheck = (char *)calloc(cmr->ncols, 1); |
| 352 |
for (dc = cm2->ncols*(colcheck != NULL); dc--; ) |
| 353 |
for (dr = cm2->nrows; dr--; ) |
| 354 |
if (memcmp(cm_lval(cm2,dr,dc), czero, sizeof(COLOR))) { |
| 355 |
colcheck[dc] = 1; |
| 356 |
break; |
| 357 |
} |
| 358 |
} |
| 359 |
for (dr = 0; dr < cmr->nrows; dr++) |
| 360 |
for (dc = 0; dc < cmr->ncols; dc++) { |
| 361 |
COLORV *dp = cm_lval(cmr,dr,dc); |
| 362 |
double res[3]; |
| 363 |
dp[0] = dp[1] = dp[2] = 0; |
| 364 |
if (rowcheck != NULL && !rowcheck[dr]) |
| 365 |
continue; |
| 366 |
if (colcheck != NULL && !colcheck[dc]) |
| 367 |
continue; |
| 368 |
res[0] = res[1] = res[2] = 0; |
| 369 |
for (i = 0; i < cm1->ncols; i++) { |
| 370 |
const COLORV *cp1 = cm_lval(cm1,dr,i); |
| 371 |
const COLORV *cp2 = cm_lval(cm2,i,dc); |
| 372 |
res[0] += cp1[0] * cp2[0]; |
| 373 |
res[1] += cp1[1] * cp2[1]; |
| 374 |
res[2] += cp1[2] * cp2[2]; |
| 375 |
} |
| 376 |
copycolor(dp, res); |
| 377 |
} |
| 378 |
if (rowcheck != NULL) free(rowcheck); |
| 379 |
if (colcheck != NULL) free(colcheck); |
| 380 |
return(cmr); |
| 381 |
} |
| 382 |
|
| 383 |
/* write out matrix to file (precede by resolution string if picture) */ |
| 384 |
int |
| 385 |
cm_write(const CMATRIX *cm, int dtype, FILE *fp) |
| 386 |
{ |
| 387 |
static const char tabEOL[2] = {'\t','\n'}; |
| 388 |
const COLORV *mp = cm->cmem; |
| 389 |
int r, c; |
| 390 |
|
| 391 |
switch (dtype) { |
| 392 |
case DTascii: |
| 393 |
for (r = 0; r < cm->nrows; r++) |
| 394 |
for (c = 0; c < cm->ncols; c++, mp += 3) |
| 395 |
fprintf(fp, "%.6e %.6e %.6e%c", |
| 396 |
mp[0], mp[1], mp[2], |
| 397 |
tabEOL[c >= cm->ncols-1]); |
| 398 |
break; |
| 399 |
case DTfloat: |
| 400 |
case DTdouble: |
| 401 |
if (sizeof(COLOR) == cm_elem_size[dtype]) { |
| 402 |
r = cm->ncols*cm->nrows; |
| 403 |
while (r > 0) { |
| 404 |
c = fwrite(mp, sizeof(COLOR), r, fp); |
| 405 |
if (c <= 0) |
| 406 |
return(0); |
| 407 |
mp += 3*c; |
| 408 |
r -= c; |
| 409 |
} |
| 410 |
} else if (dtype == DTdouble) { |
| 411 |
double dc[3]; |
| 412 |
r = cm->ncols*cm->nrows; |
| 413 |
while (r--) { |
| 414 |
copycolor(dc, mp); |
| 415 |
if (fwrite(dc, sizeof(double), 3, fp) != 3) |
| 416 |
return(0); |
| 417 |
mp += 3; |
| 418 |
} |
| 419 |
} else /* dtype == DTfloat */ { |
| 420 |
float fc[3]; |
| 421 |
r = cm->ncols*cm->nrows; |
| 422 |
while (r--) { |
| 423 |
copycolor(fc, mp); |
| 424 |
if (fwrite(fc, sizeof(float), 3, fp) != 3) |
| 425 |
return(0); |
| 426 |
mp += 3; |
| 427 |
} |
| 428 |
} |
| 429 |
break; |
| 430 |
case DTrgbe: |
| 431 |
case DTxyze: |
| 432 |
fprtresolu(cm->ncols, cm->nrows, fp); |
| 433 |
for (r = 0; r < cm->nrows; r++, mp += 3*cm->ncols) |
| 434 |
if (fwritescan((COLOR *)mp, cm->ncols, fp) < 0) |
| 435 |
return(0); |
| 436 |
break; |
| 437 |
default: |
| 438 |
fputs("Unsupported data type in cm_write()!\n", stderr); |
| 439 |
return(0); |
| 440 |
} |
| 441 |
return(fflush(fp) == 0); |
| 442 |
} |
