| 1 |
greg |
1.1 |
/* Copyright (c) 1986 Regents of the University of California */ |
| 2 |
|
|
|
| 3 |
|
|
#ifndef lint |
| 4 |
|
|
static char SCCSid[] = "$SunId$ LBL"; |
| 5 |
|
|
#endif |
| 6 |
|
|
|
| 7 |
|
|
/* |
| 8 |
|
|
* ra_t8.c - program to convert between RADIANCE and |
| 9 |
|
|
* Targa 8-bit color-mapped images. |
| 10 |
|
|
* |
| 11 |
|
|
* 8/22/88 Adapted from ra_pr.c |
| 12 |
|
|
*/ |
| 13 |
|
|
|
| 14 |
|
|
#include <stdio.h> |
| 15 |
|
|
|
| 16 |
|
|
#include "color.h" |
| 17 |
|
|
|
| 18 |
|
|
#include "pic.h" |
| 19 |
|
|
|
| 20 |
|
|
#include "targa.h" |
| 21 |
|
|
|
| 22 |
greg |
1.4 |
#ifndef BSD |
| 23 |
|
|
#define bcopy(s,d,n) (void)memcpy(d,s,n) |
| 24 |
|
|
extern char *memcpy(); |
| 25 |
|
|
#endif |
| 26 |
greg |
1.1 |
/* descriptor for a picture file or frame buffer */ |
| 27 |
|
|
typedef struct { |
| 28 |
|
|
char *name; /* file name */ |
| 29 |
|
|
FILE *fp; /* file pointer */ |
| 30 |
|
|
int nexty; /* file positioning */ |
| 31 |
|
|
int bytes_line; /* 0 == variable length lines */ |
| 32 |
|
|
union { |
| 33 |
|
|
long b; /* initial scanline */ |
| 34 |
|
|
long *y; /* individual scanline */ |
| 35 |
|
|
} pos; /* position(s) */ |
| 36 |
|
|
} pic; |
| 37 |
|
|
|
| 38 |
|
|
#define goodpic(h) (my_imType(h) && my_mapType(h)) |
| 39 |
|
|
#define my_imType(h) (((h)->dataType==IM_CMAP || (h)->dataType==IM_CCMAP) \ |
| 40 |
|
|
&& (h)->dataBits==8 && (h)->imType==0) |
| 41 |
|
|
#define my_mapType(h) ((h)->mapType==CM_HASMAP && \ |
| 42 |
|
|
((h)->CMapBits==24 || (h)->CMapBits==32)) |
| 43 |
|
|
|
| 44 |
|
|
#define taralloc(h) (pixel *)emalloc((h)->x*(h)->y*sizeof(pixel)) |
| 45 |
|
|
|
| 46 |
|
|
extern pic *openinput(); |
| 47 |
|
|
|
| 48 |
|
|
extern char *ecalloc(), *emalloc(); |
| 49 |
|
|
|
| 50 |
|
|
extern long ftell(); |
| 51 |
|
|
|
| 52 |
|
|
extern double atof(), pow(); |
| 53 |
|
|
|
| 54 |
|
|
double gamma = 2.0; /* gamma correction */ |
| 55 |
|
|
|
| 56 |
|
|
pic *inpic; |
| 57 |
|
|
|
| 58 |
|
|
char *progname; |
| 59 |
|
|
|
| 60 |
|
|
char errmsg[128]; |
| 61 |
|
|
|
| 62 |
greg |
1.7 |
COLR *inl; |
| 63 |
greg |
1.1 |
|
| 64 |
|
|
pixel *tarData; |
| 65 |
|
|
|
| 66 |
|
|
int xmax, ymax; |
| 67 |
|
|
|
| 68 |
|
|
|
| 69 |
|
|
main(argc, argv) |
| 70 |
|
|
int argc; |
| 71 |
|
|
char *argv[]; |
| 72 |
|
|
{ |
| 73 |
|
|
colormap rasmap; |
| 74 |
|
|
struct hdStruct head; |
| 75 |
|
|
int dither = 1; |
| 76 |
|
|
int reverse = 0; |
| 77 |
|
|
int ncolors = 256; |
| 78 |
|
|
int greyscale = 0; |
| 79 |
|
|
int i; |
| 80 |
|
|
|
| 81 |
|
|
progname = argv[0]; |
| 82 |
|
|
|
| 83 |
|
|
for (i = 1; i < argc; i++) |
| 84 |
|
|
if (argv[i][0] == '-') |
| 85 |
|
|
switch (argv[i][1]) { |
| 86 |
|
|
case 'd': |
| 87 |
|
|
dither = !dither; |
| 88 |
|
|
break; |
| 89 |
|
|
case 'g': |
| 90 |
|
|
gamma = atof(argv[++i]); |
| 91 |
|
|
break; |
| 92 |
|
|
case 'r': |
| 93 |
|
|
reverse = !reverse; |
| 94 |
|
|
break; |
| 95 |
|
|
case 'b': |
| 96 |
|
|
greyscale = 1; |
| 97 |
|
|
break; |
| 98 |
|
|
case 'c': |
| 99 |
|
|
ncolors = atoi(argv[++i]); |
| 100 |
|
|
break; |
| 101 |
|
|
default: |
| 102 |
|
|
goto userr; |
| 103 |
|
|
} |
| 104 |
|
|
else |
| 105 |
|
|
break; |
| 106 |
|
|
|
| 107 |
|
|
if (reverse) { |
| 108 |
|
|
if (i < argc-2) |
| 109 |
|
|
goto userr; |
| 110 |
|
|
if (i <= argc-1 && freopen(argv[i], "r", stdin) == NULL) { |
| 111 |
|
|
sprintf(errmsg, "can't open input \"%s\"", argv[i]); |
| 112 |
|
|
quiterr(errmsg); |
| 113 |
|
|
} |
| 114 |
|
|
/* get header */ |
| 115 |
|
|
if (getthead(&head, NULL, stdin) < 0) |
| 116 |
|
|
quiterr("bad targa file"); |
| 117 |
|
|
if (!goodpic(&head)) |
| 118 |
|
|
quiterr("incompatible format"); |
| 119 |
|
|
xmax = head.x; |
| 120 |
|
|
ymax = head.y; |
| 121 |
|
|
/* open output file */ |
| 122 |
|
|
if (i == argc-2 && freopen(argv[i+1], "w", stdout) == NULL) { |
| 123 |
|
|
sprintf(errmsg, "can't open output \"%s\"", argv[i+1]); |
| 124 |
|
|
quiterr(errmsg); |
| 125 |
|
|
} |
| 126 |
|
|
/* put header */ |
| 127 |
greg |
1.6 |
printargs(i, argv, stdout); |
| 128 |
greg |
1.9 |
fputformat(COLRFMT, stdout); |
| 129 |
greg |
1.1 |
putchar('\n'); |
| 130 |
greg |
1.2 |
fputresolu(YMAJOR|YDECR, xmax, ymax, stdout); |
| 131 |
greg |
1.1 |
/* convert file */ |
| 132 |
|
|
tg2ra(&head); |
| 133 |
|
|
} else { |
| 134 |
|
|
if (i > argc-1 || i < argc-2) |
| 135 |
|
|
goto userr; |
| 136 |
|
|
if ((inpic = openinput(argv[i], &head)) == NULL) { |
| 137 |
|
|
sprintf(errmsg, "can't open input \"%s\"", argv[i]); |
| 138 |
|
|
quiterr(errmsg); |
| 139 |
|
|
} |
| 140 |
|
|
if (i == argc-2 && freopen(argv[i+1], "w", stdout) == NULL) { |
| 141 |
|
|
sprintf(errmsg, "can't open output \"%s\"", argv[i+1]); |
| 142 |
|
|
quiterr(errmsg); |
| 143 |
|
|
} |
| 144 |
|
|
/* write header */ |
| 145 |
|
|
putthead(&head, NULL, stdout); |
| 146 |
|
|
/* convert file */ |
| 147 |
|
|
if (greyscale) |
| 148 |
|
|
biq(dither,ncolors,1,rasmap); |
| 149 |
|
|
else |
| 150 |
|
|
ciq(dither,ncolors,1,rasmap); |
| 151 |
|
|
/* write data */ |
| 152 |
|
|
writetarga(&head, tarData, stdout); |
| 153 |
|
|
} |
| 154 |
|
|
quiterr(NULL); |
| 155 |
|
|
userr: |
| 156 |
|
|
fprintf(stderr, |
| 157 |
|
|
"Usage: %s [-d][-c ncolors][-b][-g gamma] input [output]\n", |
| 158 |
|
|
progname); |
| 159 |
|
|
fprintf(stderr, " Or: %s -r [-g gamma] [input [output]]\n", |
| 160 |
|
|
progname); |
| 161 |
|
|
exit(1); |
| 162 |
|
|
} |
| 163 |
|
|
|
| 164 |
|
|
|
| 165 |
|
|
int |
| 166 |
|
|
getint2(fp) /* get a 2-byte positive integer */ |
| 167 |
|
|
register FILE *fp; |
| 168 |
|
|
{ |
| 169 |
|
|
register int b1, b2; |
| 170 |
|
|
|
| 171 |
|
|
if ((b1 = getc(fp)) == EOF || (b2 = getc(fp)) == EOF) |
| 172 |
|
|
quiterr("read error"); |
| 173 |
|
|
|
| 174 |
|
|
return(b1 | b2<<8); |
| 175 |
|
|
} |
| 176 |
|
|
|
| 177 |
|
|
|
| 178 |
|
|
putint2(i, fp) /* put a 2-byte positive integer */ |
| 179 |
|
|
register int i; |
| 180 |
|
|
register FILE *fp; |
| 181 |
|
|
{ |
| 182 |
|
|
putc(i&0xff, fp); |
| 183 |
|
|
putc(i>>8&0xff, fp); |
| 184 |
|
|
} |
| 185 |
|
|
|
| 186 |
|
|
|
| 187 |
|
|
quiterr(err) /* print message and exit */ |
| 188 |
|
|
char *err; |
| 189 |
|
|
{ |
| 190 |
|
|
if (err != NULL) { |
| 191 |
|
|
fprintf(stderr, "%s: %s\n", progname, err); |
| 192 |
|
|
exit(1); |
| 193 |
|
|
} |
| 194 |
|
|
exit(0); |
| 195 |
|
|
} |
| 196 |
|
|
|
| 197 |
|
|
|
| 198 |
|
|
eputs(s) |
| 199 |
|
|
char *s; |
| 200 |
|
|
{ |
| 201 |
|
|
fputs(s, stderr); |
| 202 |
|
|
} |
| 203 |
|
|
|
| 204 |
|
|
|
| 205 |
|
|
quit(code) |
| 206 |
|
|
int code; |
| 207 |
|
|
{ |
| 208 |
|
|
exit(code); |
| 209 |
|
|
} |
| 210 |
|
|
|
| 211 |
|
|
|
| 212 |
|
|
getthead(hp, ip, fp) /* read header from input */ |
| 213 |
|
|
struct hdStruct *hp; |
| 214 |
|
|
char *ip; |
| 215 |
|
|
register FILE *fp; |
| 216 |
|
|
{ |
| 217 |
|
|
int nidbytes; |
| 218 |
|
|
|
| 219 |
|
|
if ((nidbytes = getc(fp)) == EOF) |
| 220 |
|
|
return(-1); |
| 221 |
|
|
hp->mapType = getc(fp); |
| 222 |
|
|
hp->dataType = getc(fp); |
| 223 |
|
|
hp->mapOrig = getint2(fp); |
| 224 |
|
|
hp->mapLength = getint2(fp); |
| 225 |
|
|
hp->CMapBits = getc(fp); |
| 226 |
|
|
hp->XOffset = getint2(fp); |
| 227 |
|
|
hp->YOffset = getint2(fp); |
| 228 |
|
|
hp->x = getint2(fp); |
| 229 |
|
|
hp->y = getint2(fp); |
| 230 |
|
|
hp->dataBits = getc(fp); |
| 231 |
|
|
hp->imType = getc(fp); |
| 232 |
|
|
|
| 233 |
|
|
if (ip != NULL) |
| 234 |
|
|
if (nidbytes) |
| 235 |
greg |
1.4 |
fread((char *)ip, nidbytes, 1, fp); |
| 236 |
greg |
1.1 |
else |
| 237 |
|
|
*ip = '\0'; |
| 238 |
|
|
else if (nidbytes) |
| 239 |
|
|
fseek(fp, (long)nidbytes, 1); |
| 240 |
|
|
|
| 241 |
|
|
return(feof(fp) || ferror(fp) ? -1 : 0); |
| 242 |
|
|
} |
| 243 |
|
|
|
| 244 |
|
|
|
| 245 |
|
|
putthead(hp, ip, fp) /* write header to output */ |
| 246 |
|
|
struct hdStruct *hp; |
| 247 |
|
|
char *ip; |
| 248 |
|
|
register FILE *fp; |
| 249 |
|
|
{ |
| 250 |
|
|
if (ip != NULL) |
| 251 |
|
|
putc(strlen(ip), fp); |
| 252 |
|
|
else |
| 253 |
|
|
putc(0, fp); |
| 254 |
|
|
putc(hp->mapType, fp); |
| 255 |
|
|
putc(hp->dataType, fp); |
| 256 |
|
|
putint2(hp->mapOrig, fp); |
| 257 |
|
|
putint2(hp->mapLength, fp); |
| 258 |
|
|
putc(hp->CMapBits, fp); |
| 259 |
|
|
putint2(hp->XOffset, fp); |
| 260 |
|
|
putint2(hp->YOffset, fp); |
| 261 |
|
|
putint2(hp->x, fp); |
| 262 |
|
|
putint2(hp->y, fp); |
| 263 |
|
|
putc(hp->dataBits, fp); |
| 264 |
|
|
putc(hp->imType, fp); |
| 265 |
|
|
|
| 266 |
|
|
if (ip != NULL) |
| 267 |
|
|
fputs(ip, fp); |
| 268 |
|
|
|
| 269 |
|
|
return(ferror(fp) ? -1 : 0); |
| 270 |
|
|
} |
| 271 |
|
|
|
| 272 |
|
|
|
| 273 |
|
|
pic * |
| 274 |
|
|
openinput(fname, h) /* open RADIANCE input file */ |
| 275 |
|
|
char *fname; |
| 276 |
|
|
register struct hdStruct *h; |
| 277 |
|
|
{ |
| 278 |
|
|
register pic *p; |
| 279 |
|
|
|
| 280 |
|
|
p = (pic *)emalloc(sizeof(pic)); |
| 281 |
|
|
p->name = fname; |
| 282 |
|
|
if (fname == NULL) |
| 283 |
|
|
p->fp = stdin; |
| 284 |
|
|
else if ((p->fp = fopen(fname, "r")) == NULL) |
| 285 |
|
|
return(NULL); |
| 286 |
greg |
1.9 |
/* get header info. */ |
| 287 |
|
|
if (checkheader(p->fp, COLRFMT, NULL) < 0 || |
| 288 |
|
|
fgetresolu(&xmax, &ymax, p->fp) != (YMAJOR|YDECR)) |
| 289 |
|
|
quiterr("bad picture format"); |
| 290 |
greg |
1.1 |
p->nexty = 0; |
| 291 |
|
|
p->bytes_line = 0; /* variable length lines */ |
| 292 |
|
|
p->pos.y = (long *)ecalloc(ymax, sizeof(long)); |
| 293 |
|
|
p->pos.y[0] = ftell(p->fp); |
| 294 |
|
|
/* assign header */ |
| 295 |
|
|
h->textSize = 0; |
| 296 |
|
|
h->mapType = CM_HASMAP; |
| 297 |
|
|
h->dataType = IM_CMAP; |
| 298 |
|
|
h->mapOrig = 0; |
| 299 |
|
|
h->mapLength = 256; |
| 300 |
|
|
h->CMapBits = 24; |
| 301 |
|
|
h->XOffset = 0; |
| 302 |
|
|
h->YOffset = 0; |
| 303 |
|
|
h->x = xmax; |
| 304 |
|
|
h->y = ymax; |
| 305 |
|
|
h->dataBits = 8; |
| 306 |
|
|
h->imType = 0; |
| 307 |
|
|
/* allocate scanline */ |
| 308 |
greg |
1.7 |
inl = (COLR *)emalloc(xmax*sizeof(COLR)); |
| 309 |
greg |
1.1 |
/* allocate targa data */ |
| 310 |
|
|
tarData = taralloc(h); |
| 311 |
|
|
|
| 312 |
|
|
return(p); |
| 313 |
|
|
} |
| 314 |
|
|
|
| 315 |
|
|
|
| 316 |
|
|
tg2ra(hp) /* targa file to RADIANCE file */ |
| 317 |
|
|
struct hdStruct *hp; |
| 318 |
|
|
{ |
| 319 |
|
|
union { |
| 320 |
|
|
BYTE c3[256][3]; |
| 321 |
|
|
BYTE c4[256][4]; |
| 322 |
|
|
} map; |
| 323 |
|
|
COLR ctab[256]; |
| 324 |
|
|
COLR *scanline; |
| 325 |
|
|
register int i, j; |
| 326 |
|
|
|
| 327 |
|
|
/* get color table */ |
| 328 |
greg |
1.4 |
if ((hp->CMapBits==24 ? fread((char *)map.c3,sizeof(map.c3),1,stdin) : |
| 329 |
|
|
fread((char *)map.c4,sizeof(map.c4),1,stdin)) != 1) |
| 330 |
greg |
1.1 |
quiterr("error reading color table"); |
| 331 |
|
|
/* convert table */ |
| 332 |
|
|
for (i = hp->mapOrig; i < hp->mapOrig+hp->mapLength; i++) |
| 333 |
|
|
if (hp->CMapBits == 24) |
| 334 |
|
|
setcolr(ctab[i], |
| 335 |
|
|
pow((map.c3[i][2]+.5)/256.,gamma), |
| 336 |
|
|
pow((map.c3[i][1]+.5)/256.,gamma), |
| 337 |
|
|
pow((map.c3[i][0]+.5)/256.,gamma)); |
| 338 |
|
|
else |
| 339 |
|
|
setcolr(ctab[i], |
| 340 |
|
|
pow((map.c4[i][3]+.5)/256.,gamma), |
| 341 |
|
|
pow((map.c4[i][2]+.5)/256.,gamma), |
| 342 |
|
|
pow((map.c4[i][1]+.5)/256.,gamma)); |
| 343 |
|
|
|
| 344 |
|
|
/* allocate targa data */ |
| 345 |
|
|
tarData = taralloc(hp); |
| 346 |
|
|
/* get data */ |
| 347 |
|
|
readtarga(hp, tarData, stdin); |
| 348 |
|
|
/* allocate input scanline */ |
| 349 |
|
|
scanline = (COLR *)emalloc(xmax*sizeof(COLR)); |
| 350 |
|
|
/* convert file */ |
| 351 |
|
|
for (i = ymax-1; i >= 0; i--) { |
| 352 |
|
|
for (j = 0; j < xmax; j++) |
| 353 |
|
|
copycolr(scanline[j], ctab[tarData[i*xmax+j]]); |
| 354 |
|
|
if (fwritecolrs(scanline, xmax, stdout) < 0) |
| 355 |
|
|
quiterr("error writing RADIANCE file"); |
| 356 |
|
|
} |
| 357 |
|
|
free((char *)scanline); |
| 358 |
|
|
free((char *)tarData); |
| 359 |
|
|
} |
| 360 |
|
|
|
| 361 |
|
|
|
| 362 |
|
|
picreadline3(y, l3) /* read in 3-byte scanline */ |
| 363 |
|
|
int y; |
| 364 |
|
|
register rgbpixel *l3; |
| 365 |
|
|
{ |
| 366 |
greg |
1.3 |
register int i; |
| 367 |
greg |
1.1 |
|
| 368 |
greg |
1.3 |
if (inpic->nexty != y) { /* find scanline */ |
| 369 |
greg |
1.1 |
if (inpic->bytes_line == 0) { |
| 370 |
|
|
if (inpic->pos.y[y] == 0) { |
| 371 |
|
|
while (inpic->nexty < y) { |
| 372 |
greg |
1.7 |
if (freadcolrs(inl, xmax, inpic->fp) < 0) |
| 373 |
greg |
1.1 |
quiterr("read error in picreadline3"); |
| 374 |
|
|
inpic->pos.y[++inpic->nexty] = ftell(inpic->fp); |
| 375 |
|
|
} |
| 376 |
|
|
} else if (fseek(inpic->fp, inpic->pos.y[y], 0) == EOF) |
| 377 |
|
|
quiterr("seek error in picreadline3"); |
| 378 |
|
|
} else if (fseek(inpic->fp, y*inpic->bytes_line+inpic->pos.b, 0) == EOF) |
| 379 |
|
|
quiterr("seek error in picreadline3"); |
| 380 |
|
|
} else if (inpic->bytes_line == 0 && inpic->pos.y[inpic->nexty] == 0) |
| 381 |
|
|
inpic->pos.y[inpic->nexty] = ftell(inpic->fp); |
| 382 |
greg |
1.7 |
if (freadcolrs(inl, xmax, inpic->fp) < 0) /* read scanline */ |
| 383 |
greg |
1.1 |
quiterr("read error in picreadline3"); |
| 384 |
|
|
inpic->nexty = y+1; |
| 385 |
|
|
/* convert scanline */ |
| 386 |
greg |
1.7 |
normcolrs(inl, xmax, 0); |
| 387 |
greg |
1.3 |
for (i = 0; i < xmax; i++) { |
| 388 |
greg |
1.7 |
l3[i].r = inl[i][RED]; |
| 389 |
|
|
l3[i].g = inl[i][GRN]; |
| 390 |
|
|
l3[i].b = inl[i][BLU]; |
| 391 |
greg |
1.1 |
} |
| 392 |
|
|
} |
| 393 |
|
|
|
| 394 |
|
|
|
| 395 |
|
|
picwriteline(y, l) /* save output scanline */ |
| 396 |
|
|
int y; |
| 397 |
|
|
pixel *l; |
| 398 |
|
|
{ |
| 399 |
greg |
1.4 |
bcopy((char *)l, (char *)&tarData[(ymax-1-y)*xmax], xmax*sizeof(pixel)); |
| 400 |
greg |
1.1 |
} |
| 401 |
|
|
|
| 402 |
|
|
|
| 403 |
|
|
writetarga(h, d, fp) /* write out targa data */ |
| 404 |
|
|
struct hdStruct *h; |
| 405 |
|
|
pixel *d; |
| 406 |
|
|
FILE *fp; |
| 407 |
|
|
{ |
| 408 |
|
|
if (h->dataType == IM_CMAP) { /* uncompressed */ |
| 409 |
greg |
1.4 |
if (fwrite((char *)d,h->x*sizeof(pixel),h->y,fp) != h->y) |
| 410 |
greg |
1.1 |
quiterr("error writing targa file"); |
| 411 |
|
|
return; |
| 412 |
|
|
} |
| 413 |
|
|
quiterr("unsupported output type"); |
| 414 |
|
|
} |
| 415 |
|
|
|
| 416 |
|
|
|
| 417 |
|
|
readtarga(h, data, fp) /* read in targa data */ |
| 418 |
|
|
struct hdStruct *h; |
| 419 |
|
|
pixel *data; |
| 420 |
|
|
FILE *fp; |
| 421 |
|
|
{ |
| 422 |
|
|
register int cnt, c; |
| 423 |
|
|
register pixel *dp; |
| 424 |
|
|
|
| 425 |
|
|
if (h->dataType == IM_CMAP) { /* uncompressed */ |
| 426 |
greg |
1.4 |
if (fread((char *)data,h->x*sizeof(pixel),h->y,fp) != h->y) |
| 427 |
greg |
1.1 |
goto readerr; |
| 428 |
|
|
return; |
| 429 |
|
|
} |
| 430 |
|
|
for (dp = data; dp < data+h->x*h->y; ) { |
| 431 |
|
|
if ((c = getc(fp)) == EOF) |
| 432 |
|
|
goto readerr; |
| 433 |
|
|
cnt = (c & 0x7f) + 1; |
| 434 |
|
|
if (c & 0x80) { /* repeated pixel */ |
| 435 |
|
|
if ((c = getc(fp)) == EOF) |
| 436 |
|
|
goto readerr; |
| 437 |
|
|
while (cnt--) |
| 438 |
|
|
*dp++ = c; |
| 439 |
|
|
} else /* non-repeating pixels */ |
| 440 |
|
|
while (cnt--) { |
| 441 |
|
|
if ((c = getc(fp)) == EOF) |
| 442 |
|
|
goto readerr; |
| 443 |
|
|
*dp++ = c; |
| 444 |
|
|
} |
| 445 |
|
|
} |
| 446 |
|
|
return; |
| 447 |
|
|
readerr: |
| 448 |
|
|
quiterr("error reading targa file"); |
| 449 |
|
|
} |
| 450 |
|
|
|
| 451 |
|
|
|
| 452 |
|
|
picwritecm(cm) /* write out color map */ |
| 453 |
|
|
colormap cm; |
| 454 |
|
|
{ |
| 455 |
|
|
register int i, j; |
| 456 |
|
|
|
| 457 |
|
|
for (j = 0; j < 256; j++) |
| 458 |
|
|
for (i = 2; i >= 0; i--) |
| 459 |
|
|
putc(cm[i][j], stdout); |
| 460 |
|
|
} |
| 461 |
|
|
|
| 462 |
|
|
|
| 463 |
|
|
picreadcm(map) /* do gamma correction if requested */ |
| 464 |
|
|
colormap map; |
| 465 |
|
|
{ |
| 466 |
|
|
register int i, val; |
| 467 |
|
|
|
| 468 |
|
|
for (i = 0; i < 256; i++) { |
| 469 |
greg |
1.8 |
val = pow((i+0.5)/256.0, 1.0/gamma) * 256.0; |
| 470 |
greg |
1.1 |
map[0][i] = map[1][i] = map[2][i] = val; |
| 471 |
|
|
} |
| 472 |
|
|
} |
