| 1 |
The RADIANCE Picture File Format
|
| 2 |
|
| 3 |
Radiance is a lighting simulation and rendering system available by
|
| 4 |
anonymous ftp from hobbes.lbl.gov (128.3.12.38). The picture file
|
| 5 |
format used by the program uses a floating point representation that
|
| 6 |
provides greater fidelity and numerical accuracy over a 24-bit
|
| 7 |
image, without taking much extra space.
|
| 8 |
|
| 9 |
At the end of this message I have put a shar file of the routines you
|
| 10 |
need to read and write Radiance pictures. The format has been
|
| 11 |
enhanced slightly for the next release (in an upward compatible
|
| 12 |
way), so you should definitely use these newer routines.
|
| 13 |
|
| 14 |
The file format, like most binary files used by Radiance, contains
|
| 15 |
an ASCII information header that is terminated by an empty line.
|
| 16 |
This header typically begins with the line "#?RADIANCE", followd
|
| 17 |
by the commands used to generate the file, along with variables
|
| 18 |
indicating exposure, view parameters, and so on. Next there is a
|
| 19 |
single line that indicates the resolution and pixel scanning order of
|
| 20 |
the image. For Radiance pictures, the pixels are order as English
|
| 21 |
text, left to right and top to bottom. This is indicated with a line
|
| 22 |
of the form:
|
| 23 |
|
| 24 |
-Y M +X N
|
| 25 |
|
| 26 |
Where M and N are the y and x resolutions, respectively. The x and y
|
| 27 |
image coordinates are always the same, starting with (0,0) at the lower
|
| 28 |
left corner, (N,0) at the lower right, and (0,M) at the upper left.
|
| 29 |
The y resolution appears first in our specification because it is the
|
| 30 |
major sort, and is preceded by a minus sign because it is decreasing in
|
| 31 |
the file.
|
| 32 |
|
| 33 |
Finally, the floating point scanlines follow. Each pixel is represented by
|
| 34 |
at most 4 bytes. The first three bytes are the red, green and blue mantissas
|
| 35 |
(in that order), and the fourth byte is a common exponent. The floating point
|
| 36 |
color (R,G,B)=(1.,.5,.25) would be represented by the bytes (128,64,32,129).
|
| 37 |
The conversion back to floating point is possible using the ldexp() library
|
| 38 |
routine, or it's better to use the colr_color() routine included in color.c.
|
| 39 |
|
| 40 |
The scanlines are usually run-length encoded. My previous scheme (release 1.4
|
| 41 |
and earlier) used a simple count for repeated pixels. My new scheme is
|
| 42 |
more complicated and encodes the four components separately. I don't
|
| 43 |
recommend writing your own routine to decode it -- use what's in color.c.
|
| 44 |
|
| 45 |
A skeletal program to read a Radiance picture file and convert to 24-bit
|
| 46 |
gamma-corrected color looks like this:
|
| 47 |
|
| 48 |
/* Copyright (c) 1992 Regents of the University of California */
|
| 49 |
|
| 50 |
#ifndef lint
|
| 51 |
static char SCCSid[] = "@(#)ra_skel.c 2.9 2/27/94 LBL";
|
| 52 |
#endif
|
| 53 |
|
| 54 |
/*
|
| 55 |
* Skeletal 24-bit image conversion program. Replace "skel"
|
| 56 |
* in this file with a more appropriate image type identifier.
|
| 57 |
*
|
| 58 |
* The Rmakefile entry should look something like this:
|
| 59 |
* ra_skel: ra_skel.o
|
| 60 |
* cc $(CFLAGS) -o ra_skel ra_skel.o -lrtrad -lm
|
| 61 |
* ra_skel.o: ../common/color.h ../common/resolu.h
|
| 62 |
*
|
| 63 |
* If you like to do things the hard way, you can link directly
|
| 64 |
* to the object files "color.o colrops.o resolu.o header.o" in
|
| 65 |
* the common subdirectory instead of using the -lrtrad library.
|
| 66 |
*/
|
| 67 |
|
| 68 |
#include <stdio.h>
|
| 69 |
#include <math.h>
|
| 70 |
#ifdef MSDOS
|
| 71 |
#include <fcntl.h>
|
| 72 |
#endif
|
| 73 |
#include "color.h"
|
| 74 |
#include "resolu.h"
|
| 75 |
|
| 76 |
extern char *malloc();
|
| 77 |
|
| 78 |
double gamcor = 2.2; /* gamma correction */
|
| 79 |
|
| 80 |
int bradj = 0; /* brightness adjustment */
|
| 81 |
|
| 82 |
char *progname;
|
| 83 |
|
| 84 |
int xmax, ymax;
|
| 85 |
|
| 86 |
|
| 87 |
main(argc, argv)
|
| 88 |
int argc;
|
| 89 |
char *argv[];
|
| 90 |
{
|
| 91 |
int reverse = 0;
|
| 92 |
int i;
|
| 93 |
|
| 94 |
progname = argv[0];
|
| 95 |
|
| 96 |
for (i = 1; i < argc; i++)
|
| 97 |
if (argv[i][0] == '-')
|
| 98 |
switch (argv[i][1]) {
|
| 99 |
case 'g': /* gamma correction */
|
| 100 |
gamcor = atof(argv[++i]);
|
| 101 |
break;
|
| 102 |
case 'e': /* exposure adjustment */
|
| 103 |
if (argv[i+1][0] != '+' && argv[i+1][0] != '-')
|
| 104 |
goto userr;
|
| 105 |
bradj = atoi(argv[++i]);
|
| 106 |
break;
|
| 107 |
case 'r': /* reverse conversion */
|
| 108 |
reverse = 1;
|
| 109 |
break;
|
| 110 |
default:
|
| 111 |
goto userr;
|
| 112 |
}
|
| 113 |
else
|
| 114 |
break;
|
| 115 |
|
| 116 |
if (i < argc-2)
|
| 117 |
goto userr;
|
| 118 |
if (i <= argc-1 && freopen(argv[i], "r", stdin) == NULL) {
|
| 119 |
fprintf(stderr, "%s: can't open input \"%s\"\n",
|
| 120 |
progname, argv[i]);
|
| 121 |
exit(1);
|
| 122 |
}
|
| 123 |
if (i == argc-2 && freopen(argv[i+1], "w", stdout) == NULL) {
|
| 124 |
fprintf(stderr, "%s: can't open output \"%s\"\n",
|
| 125 |
progname, argv[i+1]);
|
| 126 |
exit(1);
|
| 127 |
}
|
| 128 |
#ifdef MSDOS
|
| 129 |
setmode(fileno(stdin), O_BINARY);
|
| 130 |
setmode(fileno(stdout), O_BINARY);
|
| 131 |
#endif
|
| 132 |
setcolrgam(gamcor); /* set up gamma correction */
|
| 133 |
if (reverse) {
|
| 134 |
/* get their image resolution */
|
| 135 |
read_skel_head(&xmax, &ymax);
|
| 136 |
/* put our header */
|
| 137 |
newheader("RADIANCE", stdout);
|
| 138 |
printargs(i, argv, stdout);
|
| 139 |
fputformat(COLRFMT, stdout);
|
| 140 |
putchar('\n');
|
| 141 |
fprtresolu(xmax, ymax, stdout);
|
| 142 |
/* convert file */
|
| 143 |
skel2ra();
|
| 144 |
} else {
|
| 145 |
/* get our header */
|
| 146 |
if (checkheader(stdin, COLRFMT, NULL) < 0 ||
|
| 147 |
fgetresolu(&xmax, &ymax, stdin) < 0)
|
| 148 |
quiterr("bad picture format");
|
| 149 |
/* write their header */
|
| 150 |
write_skel_head(xmax, ymax);
|
| 151 |
/* convert file */
|
| 152 |
ra2skel();
|
| 153 |
}
|
| 154 |
exit(0);
|
| 155 |
userr:
|
| 156 |
fprintf(stderr,
|
| 157 |
"Usage: %s [-r][-g gamma][-e +/-stops] [input [output]]\n",
|
| 158 |
progname);
|
| 159 |
exit(1);
|
| 160 |
}
|
| 161 |
|
| 162 |
|
| 163 |
quiterr(err) /* print message and exit */
|
| 164 |
char *err;
|
| 165 |
{
|
| 166 |
if (err != NULL) {
|
| 167 |
fprintf(stderr, "%s: %s\n", progname, err);
|
| 168 |
exit(1);
|
| 169 |
}
|
| 170 |
exit(0);
|
| 171 |
}
|
| 172 |
|
| 173 |
|
| 174 |
skel2ra() /* convert 24-bit scanlines to Radiance picture */
|
| 175 |
{
|
| 176 |
COLR *scanout;
|
| 177 |
register int x;
|
| 178 |
int y;
|
| 179 |
/* allocate scanline */
|
| 180 |
scanout = (COLR *)malloc(xmax*sizeof(COLR));
|
| 181 |
if (scanout == NULL)
|
| 182 |
quiterr("out of memory in skel2ra");
|
| 183 |
/* convert image */
|
| 184 |
for (y = ymax-1; y >= 0; y--) {
|
| 185 |
for (x = 0; x < xmax; x++) {
|
| 186 |
scanout[x][RED] = getc(stdin);
|
| 187 |
scanout[x][GRN] = getc(stdin);
|
| 188 |
scanout[x][BLU] = getc(stdin);
|
| 189 |
}
|
| 190 |
if (feof(stdin) | ferror(stdin))
|
| 191 |
quiterr("error reading skel image");
|
| 192 |
/* undo gamma */
|
| 193 |
gambs_colrs(scanout, xmax);
|
| 194 |
if (bradj) /* adjust exposure */
|
| 195 |
shiftcolrs(scanout, xmax, bradj);
|
| 196 |
if (fwritecolrs(scanout, xmax, stdout) < 0)
|
| 197 |
quiterr("error writing Radiance picture");
|
| 198 |
}
|
| 199 |
/* free scanline */
|
| 200 |
free((char *)scanout);
|
| 201 |
}
|
| 202 |
|
| 203 |
|
| 204 |
ra2skel() /* convert Radiance scanlines to 24-bit */
|
| 205 |
{
|
| 206 |
COLR *scanin;
|
| 207 |
register int x;
|
| 208 |
int y;
|
| 209 |
/* allocate scanline */
|
| 210 |
scanin = (COLR *)malloc(xmax*sizeof(COLR));
|
| 211 |
if (scanin == NULL)
|
| 212 |
quiterr("out of memory in ra2skel");
|
| 213 |
/* convert image */
|
| 214 |
for (y = ymax-1; y >= 0; y--) {
|
| 215 |
if (freadcolrs(scanin, xmax, stdin) < 0)
|
| 216 |
quiterr("error reading Radiance picture");
|
| 217 |
if (bradj) /* adjust exposure */
|
| 218 |
shiftcolrs(scanin, xmax, bradj);
|
| 219 |
colrs_gambs(scanin, xmax); /* gamma correction */
|
| 220 |
for (x = 0; x < xmax; x++) {
|
| 221 |
putc(scanin[x][RED], stdout);
|
| 222 |
putc(scanin[x][GRN], stdout);
|
| 223 |
putc(scanin[x][BLU], stdout);
|
| 224 |
}
|
| 225 |
if (ferror(stdout))
|
| 226 |
quiterr("error writing skel file");
|
| 227 |
}
|
| 228 |
/* free scanline */
|
| 229 |
free((char *)scanin);
|
| 230 |
}
|
| 231 |
--------------------------------------------------------------
|
| 232 |
|
| 233 |
You will find all the routines you need in ray/src/common. The
|
| 234 |
checkheader() routine is in the module header.c, fgetresolu is in resolu.c,
|
| 235 |
freadcolrs() is in color.c, and setcolrgam() and colrs_gambs() are
|
| 236 |
in the module colrops.c.
|
| 237 |
|
| 238 |
If you want to convert the file to 8-bit color, the process is quite a
|
| 239 |
bit more complicated. I suggest you take a look at the ra_t8.c program
|
| 240 |
in the ray/src/px directory to get a better idea of what is involved.
|
| 241 |
|
| 242 |
------------------------------
|
| 243 |
#! /bin/sh
|
| 244 |
# This is a shell archive, meaning:
|
| 245 |
# 1. Remove everything above the #! /bin/sh line.
|
| 246 |
# 2. Save the resulting text in a file.
|
| 247 |
# 3. Execute the file with /bin/sh (not csh) to create:
|
| 248 |
# color.h
|
| 249 |
# resolu.h
|
| 250 |
# resolu.c
|
| 251 |
# header.c
|
| 252 |
# color.c
|
| 253 |
# colrops.c
|
| 254 |
# This archive created: Tue Apr 5 14:07:02 1994
|
| 255 |
export PATH; PATH=/bin:/usr/bin:$PATH
|
| 256 |
if test -f 'color.h'
|
| 257 |
then
|
| 258 |
echo shar: "will not over-write existing file 'color.h'"
|
| 259 |
else
|
| 260 |
sed 's/^X//' << \SHAR_EOF > 'color.h'
|
| 261 |
X/* Copyright (c) 1991 Regents of the University of California */
|
| 262 |
X
|
| 263 |
X/* SCCSid "@(#)color.h 2.6 8/2/93 LBL" */
|
| 264 |
X
|
| 265 |
X/*
|
| 266 |
X * color.h - header for routines using pixel color values.
|
| 267 |
X *
|
| 268 |
X * 12/31/85
|
| 269 |
X *
|
| 270 |
X * Two color representations are used, one for calculation and
|
| 271 |
X * another for storage. Calculation is done with three floats
|
| 272 |
X * for speed. Stored color values use 4 bytes which contain
|
| 273 |
X * three single byte mantissas and a common exponent.
|
| 274 |
X */
|
| 275 |
X
|
| 276 |
X#define RED 0
|
| 277 |
X#define GRN 1
|
| 278 |
X#define BLU 2
|
| 279 |
X#define EXP 3
|
| 280 |
X#define COLXS 128 /* excess used for exponent */
|
| 281 |
X
|
| 282 |
Xtypedef unsigned char BYTE; /* 8-bit unsigned integer */
|
| 283 |
X
|
| 284 |
Xtypedef BYTE COLR[4]; /* red, green, blue, exponent */
|
| 285 |
X
|
| 286 |
X#define copycolr(c1,c2) (c1[0]=c2[0],c1[1]=c2[1], \
|
| 287 |
X c1[2]=c2[2],c1[3]=c2[3])
|
| 288 |
X
|
| 289 |
Xtypedef float COLOR[3]; /* red, green, blue */
|
| 290 |
X
|
| 291 |
X#define colval(col,pri) ((col)[pri])
|
| 292 |
X
|
| 293 |
X#define setcolor(col,r,g,b) ((col)[RED]=(r),(col)[GRN]=(g),(col)[BLU]=(b))
|
| 294 |
X
|
| 295 |
X#define copycolor(c1,c2) ((c1)[0]=(c2)[0],(c1)[1]=(c2)[1],(c1)[2]=(c2)[2])
|
| 296 |
X
|
| 297 |
X#define scalecolor(col,sf) ((col)[0]*=(sf),(col)[1]*=(sf),(col)[2]*=(sf))
|
| 298 |
X
|
| 299 |
X#define addcolor(c1,c2) ((c1)[0]+=(c2)[0],(c1)[1]+=(c2)[1],(c1)[2]+=(c2)[2])
|
| 300 |
X
|
| 301 |
X#define multcolor(c1,c2) ((c1)[0]*=(c2)[0],(c1)[1]*=(c2)[1],(c1)[2]*=(c2)[2])
|
| 302 |
X
|
| 303 |
X#ifdef NTSC
|
| 304 |
X#define bright(col) (.295*(col)[RED]+.636*(col)[GRN]+.070*(col)[BLU])
|
| 305 |
X#define normbright(c) (int)((74L*(c)[RED]+164L*(c)[GRN]+18L*(c)[BLU])>>8)
|
| 306 |
X#else
|
| 307 |
X#define bright(col) (.263*(col)[RED]+.655*(col)[GRN]+.082*(col)[BLU])
|
| 308 |
X#define normbright(c) (int)((67L*(c)[RED]+168L*(c)[GRN]+21L*(c)[BLU])>>8)
|
| 309 |
X#endif
|
| 310 |
X
|
| 311 |
X /* luminous efficacies over visible spectrum */
|
| 312 |
X#define MAXEFFICACY 683. /* defined maximum at 550 nm */
|
| 313 |
X#define WHTEFFICACY 179. /* uniform white light */
|
| 314 |
X#define D65EFFICACY 203. /* standard illuminant D65 */
|
| 315 |
X#define INCEFFICACY 160. /* illuminant A (incand.) */
|
| 316 |
X#define SUNEFFICACY 208. /* illuminant B (solar dir.) */
|
| 317 |
X#define SKYEFFICACY D65EFFICACY /* skylight */
|
| 318 |
X#define DAYEFFICACY D65EFFICACY /* combined sky and solar */
|
| 319 |
X
|
| 320 |
X#define luminance(col) (WHTEFFICACY * bright(col))
|
| 321 |
X
|
| 322 |
X#define intens(col) ( (col)[0] > (col)[1] \
|
| 323 |
X ? (col)[0] > (col)[2] ? (col)[0] : (col)[2] \
|
| 324 |
X : (col)[1] > (col)[2] ? (col)[1] : (col)[2] )
|
| 325 |
X
|
| 326 |
X#define colrval(c,p) ( (c)[EXP] ? \
|
| 327 |
X ldexp((c)[p]+.5,(int)(c)[EXP]-(COLXS+8)) : \
|
| 328 |
X 0. )
|
| 329 |
X
|
| 330 |
X#define WHTCOLOR {1.0,1.0,1.0}
|
| 331 |
X#define BLKCOLOR {0.0,0.0,0.0}
|
| 332 |
X#define WHTCOLR {128,128,128,COLXS+1}
|
| 333 |
X#define BLKCOLR {0,0,0,0}
|
| 334 |
X
|
| 335 |
X /* picture format identifier */
|
| 336 |
X#define COLRFMT "32-bit_rle_rgbe"
|
| 337 |
X
|
| 338 |
X /* macros for exposures */
|
| 339 |
X#define EXPOSSTR "EXPOSURE="
|
| 340 |
X#define LEXPOSSTR 9
|
| 341 |
X#define isexpos(hl) (!strncmp(hl,EXPOSSTR,LEXPOSSTR))
|
| 342 |
X#define exposval(hl) atof((hl)+LEXPOSSTR)
|
| 343 |
X#define fputexpos(ex,fp) fprintf(fp,"%s%e\n",EXPOSSTR,ex)
|
| 344 |
X
|
| 345 |
X /* macros for pixel aspect ratios */
|
| 346 |
X#define ASPECTSTR "PIXASPECT="
|
| 347 |
X#define LASPECTSTR 10
|
| 348 |
X#define isaspect(hl) (!strncmp(hl,ASPECTSTR,LASPECTSTR))
|
| 349 |
X#define aspectval(hl) atof((hl)+LASPECTSTR)
|
| 350 |
X#define fputaspect(pa,fp) fprintf(fp,"%s%f\n",ASPECTSTR,pa)
|
| 351 |
X
|
| 352 |
X /* macros for color correction */
|
| 353 |
X#define COLCORSTR "COLORCORR="
|
| 354 |
X#define LCOLCORSTR 10
|
| 355 |
X#define iscolcor(hl) (!strncmp(hl,COLCORSTR,LCOLCORSTR))
|
| 356 |
X#define colcorval(cc,hl) sscanf(hl+LCOLCORSTR,"%f %f %f", \
|
| 357 |
X &(cc)[RED],&(cc)[GRN],&(cc)[BLU])
|
| 358 |
X#define fputcolcor(cc,fp) fprintf(fp,"%s %f %f %f\n",COLCORSTR, \
|
| 359 |
X (cc)[RED],(cc)[GRN],(cc)[BLU])
|
| 360 |
X
|
| 361 |
X#ifdef DCL_ATOF
|
| 362 |
Xextern double atof(), ldexp(), frexp();
|
| 363 |
X#endif
|
| 364 |
SHAR_EOF
|
| 365 |
fi
|
| 366 |
if test -f 'resolu.h'
|
| 367 |
then
|
| 368 |
echo shar: "will not over-write existing file 'resolu.h'"
|
| 369 |
else
|
| 370 |
sed 's/^X//' << \SHAR_EOF > 'resolu.h'
|
| 371 |
X/* Copyright (c) 1991 Regents of the University of California */
|
| 372 |
X
|
| 373 |
X/* SCCSid "@(#)resolu.h 2.2 6/4/93 LBL" */
|
| 374 |
X
|
| 375 |
X/*
|
| 376 |
X * Definitions for resolution line in image file.
|
| 377 |
X *
|
| 378 |
X * True image orientation is defined by an xy coordinate system
|
| 379 |
X * whose origin is at the lower left corner of the image, with
|
| 380 |
X * x increasing to the right and y increasing in the upward direction.
|
| 381 |
X * This true orientation is independent of how the pixels are actually
|
| 382 |
X * ordered in the file, which is indicated by the resolution line.
|
| 383 |
X * This line is of the form "{+-}{XY} xyres {+-}{YX} yxres\n".
|
| 384 |
X * A typical line for a 1024x600 image might be "-Y 600 +X 1024\n",
|
| 385 |
X * indicating that the scanlines are in English text order (PIXSTANDARD).
|
| 386 |
X */
|
| 387 |
X
|
| 388 |
X /* flags for scanline ordering */
|
| 389 |
X#define XDECR 1
|
| 390 |
X#define YDECR 2
|
| 391 |
X#define YMAJOR 4
|
| 392 |
X
|
| 393 |
X /* standard scanline ordering */
|
| 394 |
X#define PIXSTANDARD (YMAJOR|YDECR)
|
| 395 |
X#define PIXSTDFMT "-Y %d +X %d\n"
|
| 396 |
X
|
| 397 |
X /* structure for image dimensions */
|
| 398 |
Xtypedef struct {
|
| 399 |
X int or; /* orientation (from flags above) */
|
| 400 |
X int xr, yr; /* x and y resolution */
|
| 401 |
X} RESOLU;
|
| 402 |
X
|
| 403 |
X /* macros to get scanline length and number */
|
| 404 |
X#define scanlen(rs) ((rs)->or & YMAJOR ? (rs)->xr : (rs)->yr)
|
| 405 |
X#define numscans(rs) ((rs)->or & YMAJOR ? (rs)->yr : (rs)->xr)
|
| 406 |
X
|
| 407 |
X /* resolution string buffer and its size */
|
| 408 |
X#define RESOLU_BUFLEN 32
|
| 409 |
Xextern char resolu_buf[RESOLU_BUFLEN];
|
| 410 |
X
|
| 411 |
X /* macros for reading/writing resolution struct */
|
| 412 |
X#define fputsresolu(rs,fp) fputs(resolu2str(resolu_buf,rs),fp)
|
| 413 |
X#define fgetsresolu(rs,fp) str2resolu(rs, \
|
| 414 |
X fgets(resolu_buf,RESOLU_BUFLEN,fp))
|
| 415 |
X
|
| 416 |
X /* reading/writing of standard ordering */
|
| 417 |
X#define fprtresolu(sl,ns,fp) fprintf(fp,PIXSTDFMT,ns,sl)
|
| 418 |
X#define fscnresolu(sl,ns,fp) (fscanf(fp,PIXSTDFMT,ns,sl)==2)
|
| 419 |
X
|
| 420 |
Xextern char *resolu2str();
|
| 421 |
SHAR_EOF
|
| 422 |
fi
|
| 423 |
if test -f 'resolu.c'
|
| 424 |
then
|
| 425 |
echo shar: "will not over-write existing file 'resolu.c'"
|
| 426 |
else
|
| 427 |
sed 's/^X//' << \SHAR_EOF > 'resolu.c'
|
| 428 |
X/* Copyright (c) 1991 Regents of the University of California */
|
| 429 |
X
|
| 430 |
X#ifndef lint
|
| 431 |
Xstatic char SCCSid[] = "@(#)resolu.c 2.2 11/28/91 LBL";
|
| 432 |
X#endif
|
| 433 |
X
|
| 434 |
X/*
|
| 435 |
X * Read and write image resolutions.
|
| 436 |
X */
|
| 437 |
X
|
| 438 |
X#include <stdio.h>
|
| 439 |
X
|
| 440 |
X#include "resolu.h"
|
| 441 |
X
|
| 442 |
X
|
| 443 |
Xchar resolu_buf[RESOLU_BUFLEN]; /* resolution line buffer */
|
| 444 |
X
|
| 445 |
X
|
| 446 |
Xfputresolu(ord, sl, ns, fp) /* put out picture dimensions */
|
| 447 |
Xint ord; /* scanline ordering */
|
| 448 |
Xint sl, ns; /* scanline length and number */
|
| 449 |
XFILE *fp;
|
| 450 |
X{
|
| 451 |
X RESOLU rs;
|
| 452 |
X
|
| 453 |
X if ((rs.or = ord) & YMAJOR) {
|
| 454 |
X rs.xr = sl;
|
| 455 |
X rs.yr = ns;
|
| 456 |
X } else {
|
| 457 |
X rs.xr = ns;
|
| 458 |
X rs.yr = sl;
|
| 459 |
X }
|
| 460 |
X fputsresolu(&rs, fp);
|
| 461 |
X}
|
| 462 |
X
|
| 463 |
X
|
| 464 |
Xint
|
| 465 |
Xfgetresolu(sl, ns, fp) /* get picture dimensions */
|
| 466 |
Xint *sl, *ns; /* scanline length and number */
|
| 467 |
XFILE *fp;
|
| 468 |
X{
|
| 469 |
X RESOLU rs;
|
| 470 |
X
|
| 471 |
X if (!fgetsresolu(&rs, fp))
|
| 472 |
X return(-1);
|
| 473 |
X if (rs.or & YMAJOR) {
|
| 474 |
X *sl = rs.xr;
|
| 475 |
X *ns = rs.yr;
|
| 476 |
X } else {
|
| 477 |
X *sl = rs.yr;
|
| 478 |
X *ns = rs.xr;
|
| 479 |
X }
|
| 480 |
X return(rs.or);
|
| 481 |
X}
|
| 482 |
X
|
| 483 |
X
|
| 484 |
Xchar *
|
| 485 |
Xresolu2str(buf, rp) /* convert resolution struct to line */
|
| 486 |
Xchar *buf;
|
| 487 |
Xregister RESOLU *rp;
|
| 488 |
X{
|
| 489 |
X if (rp->or&YMAJOR)
|
| 490 |
X sprintf(buf, "%cY %d %cX %d\n",
|
| 491 |
X rp->or&YDECR ? '-' : '+', rp->yr,
|
| 492 |
X rp->or&XDECR ? '-' : '+', rp->xr);
|
| 493 |
X else
|
| 494 |
X sprintf(buf, "%cX %d %cY %d\n",
|
| 495 |
X rp->or&XDECR ? '-' : '+', rp->xr,
|
| 496 |
X rp->or&YDECR ? '-' : '+', rp->yr);
|
| 497 |
X return(buf);
|
| 498 |
X}
|
| 499 |
X
|
| 500 |
X
|
| 501 |
Xstr2resolu(rp, buf) /* convert resolution line to struct */
|
| 502 |
Xregister RESOLU *rp;
|
| 503 |
Xchar *buf;
|
| 504 |
X{
|
| 505 |
X register char *xndx, *yndx;
|
| 506 |
X register char *cp;
|
| 507 |
X
|
| 508 |
X if (buf == NULL)
|
| 509 |
X return(0);
|
| 510 |
X xndx = yndx = NULL;
|
| 511 |
X for (cp = buf; *cp; cp++)
|
| 512 |
X if (*cp == 'X')
|
| 513 |
X xndx = cp;
|
| 514 |
X else if (*cp == 'Y')
|
| 515 |
X yndx = cp;
|
| 516 |
X if (xndx == NULL || yndx == NULL)
|
| 517 |
X return(0);
|
| 518 |
X rp->or = 0;
|
| 519 |
X if (xndx > yndx) rp->or |= YMAJOR;
|
| 520 |
X if (xndx[-1] == '-') rp->or |= XDECR;
|
| 521 |
X if (yndx[-1] == '-') rp->or |= YDECR;
|
| 522 |
X if ((rp->xr = atoi(xndx+1)) <= 0)
|
| 523 |
X return(0);
|
| 524 |
X if ((rp->yr = atoi(yndx+1)) <= 0)
|
| 525 |
X return(0);
|
| 526 |
X return(1);
|
| 527 |
X}
|
| 528 |
SHAR_EOF
|
| 529 |
fi
|
| 530 |
if test -f 'header.c'
|
| 531 |
then
|
| 532 |
echo shar: "will not over-write existing file 'header.c'"
|
| 533 |
else
|
| 534 |
sed 's/^X//' << \SHAR_EOF > 'header.c'
|
| 535 |
X/* Copyright (c) 1994 Regents of the University of California */
|
| 536 |
X
|
| 537 |
X#ifndef lint
|
| 538 |
Xstatic char SCCSid[] = "@(#)header.c 2.4 2/27/94 LBL";
|
| 539 |
X#endif
|
| 540 |
X
|
| 541 |
X/*
|
| 542 |
X * header.c - routines for reading and writing information headers.
|
| 543 |
X *
|
| 544 |
X * 8/19/88
|
| 545 |
X *
|
| 546 |
X * newheader(t,fp) start new information header identified by string t
|
| 547 |
X * isheadid(s) returns true if s is a header id line
|
| 548 |
X * headidval(r,s) copy header identifier value in s to r
|
| 549 |
X * printargs(ac,av,fp) print an argument list to fp, followed by '\n'
|
| 550 |
X * isformat(s) returns true if s is of the form "FORMAT=*"
|
| 551 |
X * formatval(r,s) copy the format value in s to r
|
| 552 |
X * fputformat(s,fp) write "FORMAT=%s" to fp
|
| 553 |
X * getheader(fp,f,p) read header from fp, calling f(s,p) on each line
|
| 554 |
X * checkheader(i,p,o) check header format from i against p and copy to o
|
| 555 |
X *
|
| 556 |
X * To copy header from input to output, use getheader(fin, fputs, fout)
|
| 557 |
X */
|
| 558 |
X
|
| 559 |
X#include <stdio.h>
|
| 560 |
X#include <ctype.h>
|
| 561 |
X
|
| 562 |
X#define MAXLINE 512
|
| 563 |
X
|
| 564 |
X#ifndef BSD
|
| 565 |
X#define index strchr
|
| 566 |
X#endif
|
| 567 |
X
|
| 568 |
Xextern char *index();
|
| 569 |
X
|
| 570 |
Xchar HDRSTR[] = "#?"; /* information header magic number */
|
| 571 |
X
|
| 572 |
Xchar FMTSTR[] = "FORMAT="; /* format identifier */
|
| 573 |
X
|
| 574 |
X
|
| 575 |
Xnewheader(s, fp) /* identifying line of information header */
|
| 576 |
Xchar *s;
|
| 577 |
Xregister FILE *fp;
|
| 578 |
X{
|
| 579 |
X fputs(HDRSTR, fp);
|
| 580 |
X fputs(s, fp);
|
| 581 |
X putc('\n', fp);
|
| 582 |
X}
|
| 583 |
X
|
| 584 |
X
|
| 585 |
Xheadidval(r,s) /* get header id (return true if is id) */
|
| 586 |
Xregister char *r, *s;
|
| 587 |
X{
|
| 588 |
X register char *cp = HDRSTR;
|
| 589 |
X
|
| 590 |
X while (*cp) if (*cp++ != *s++) return(0);
|
| 591 |
X if (r == NULL) return(1);
|
| 592 |
X while (*s) *r++ = *s++;
|
| 593 |
X *r = '\0';
|
| 594 |
X return(1);
|
| 595 |
X}
|
| 596 |
X
|
| 597 |
X
|
| 598 |
Xisheadid(s) /* check to see if line is header id */
|
| 599 |
Xchar *s;
|
| 600 |
X{
|
| 601 |
X return(headidval(NULL, s));
|
| 602 |
X}
|
| 603 |
X
|
| 604 |
X
|
| 605 |
Xprintargs(ac, av, fp) /* print arguments to a file */
|
| 606 |
Xint ac;
|
| 607 |
Xchar **av;
|
| 608 |
Xregister FILE *fp;
|
| 609 |
X{
|
| 610 |
X int quote;
|
| 611 |
X
|
| 612 |
X while (ac-- > 0) {
|
| 613 |
X if (index(*av, ' ') != NULL) { /* quote it */
|
| 614 |
X if (index(*av, '\'') != NULL)
|
| 615 |
X quote = '"';
|
| 616 |
X else
|
| 617 |
X quote = '\'';
|
| 618 |
X putc(quote, fp);
|
| 619 |
X fputs(*av++, fp);
|
| 620 |
X putc(quote, fp);
|
| 621 |
X } else
|
| 622 |
X fputs(*av++, fp);
|
| 623 |
X putc(' ', fp);
|
| 624 |
X }
|
| 625 |
X putc('\n', fp);
|
| 626 |
X}
|
| 627 |
X
|
| 628 |
X
|
| 629 |
Xformatval(r, s) /* get format value (return true if format) */
|
| 630 |
Xregister char *r;
|
| 631 |
Xregister char *s;
|
| 632 |
X{
|
| 633 |
X register char *cp = FMTSTR;
|
| 634 |
X
|
| 635 |
X while (*cp) if (*cp++ != *s++) return(0);
|
| 636 |
X while (isspace(*s)) s++;
|
| 637 |
X if (!*s) return(0);
|
| 638 |
X if (r == NULL) return(1);
|
| 639 |
X while(*s) *r++ = *s++;
|
| 640 |
X while (isspace(r[-1])) r--;
|
| 641 |
X *r = '\0';
|
| 642 |
X return(1);
|
| 643 |
X}
|
| 644 |
X
|
| 645 |
X
|
| 646 |
Xisformat(s) /* is line a format line? */
|
| 647 |
Xchar *s;
|
| 648 |
X{
|
| 649 |
X return(formatval(NULL, s));
|
| 650 |
X}
|
| 651 |
X
|
| 652 |
X
|
| 653 |
Xfputformat(s, fp) /* put out a format value */
|
| 654 |
Xchar *s;
|
| 655 |
XFILE *fp;
|
| 656 |
X{
|
| 657 |
X fputs(FMTSTR, fp);
|
| 658 |
X fputs(s, fp);
|
| 659 |
X putc('\n', fp);
|
| 660 |
X}
|
| 661 |
X
|
| 662 |
X
|
| 663 |
Xgetheader(fp, f, p) /* get header from file */
|
| 664 |
XFILE *fp;
|
| 665 |
Xint (*f)();
|
| 666 |
Xchar *p;
|
| 667 |
X{
|
| 668 |
X char buf[MAXLINE];
|
| 669 |
X
|
| 670 |
X for ( ; ; ) {
|
| 671 |
X buf[MAXLINE-2] = '\n';
|
| 672 |
X if (fgets(buf, MAXLINE, fp) == NULL)
|
| 673 |
X return(-1);
|
| 674 |
X if (buf[0] == '\n')
|
| 675 |
X return(0);
|
| 676 |
X#ifdef MSDOS
|
| 677 |
X if (buf[0] == '\r' && buf[1] == '\n')
|
| 678 |
X return(0);
|
| 679 |
X#endif
|
| 680 |
X if (buf[MAXLINE-2] != '\n') {
|
| 681 |
X ungetc(buf[MAXLINE-2], fp); /* prevent false end */
|
| 682 |
X buf[MAXLINE-2] = '\0';
|
| 683 |
X }
|
| 684 |
X if (f != NULL)
|
| 685 |
X (*f)(buf, p);
|
| 686 |
X }
|
| 687 |
X}
|
| 688 |
X
|
| 689 |
X
|
| 690 |
Xstruct check {
|
| 691 |
X FILE *fp;
|
| 692 |
X char fs[64];
|
| 693 |
X};
|
| 694 |
X
|
| 695 |
X
|
| 696 |
Xstatic
|
| 697 |
Xmycheck(s, cp) /* check a header line for format info. */
|
| 698 |
Xchar *s;
|
| 699 |
Xregister struct check *cp;
|
| 700 |
X{
|
| 701 |
X if (!formatval(cp->fs, s) && cp->fp != NULL)
|
| 702 |
X fputs(s, cp->fp);
|
| 703 |
X}
|
| 704 |
X
|
| 705 |
X
|
| 706 |
X/*
|
| 707 |
X * Copymatch(pat,str) checks pat for wildcards, and
|
| 708 |
X * copies str into pat if there is a match (returning true).
|
| 709 |
X */
|
| 710 |
X
|
| 711 |
X#ifdef COPYMATCH
|
| 712 |
Xcopymatch(pat, str)
|
| 713 |
Xchar *pat, *str;
|
| 714 |
X{
|
| 715 |
X int docopy = 0;
|
| 716 |
X register char *p = pat, *s = str;
|
| 717 |
X
|
| 718 |
X do {
|
| 719 |
X switch (*p) {
|
| 720 |
X case '?': /* match any character */
|
| 721 |
X if (!*s++)
|
| 722 |
X return(0);
|
| 723 |
X docopy++;
|
| 724 |
X break;
|
| 725 |
X case '*': /* match any string */
|
| 726 |
X while (p[1] == '*') p++;
|
| 727 |
X do
|
| 728 |
X if ( (p[1]=='?' || p[1]==*s)
|
| 729 |
X && copymatch(p+1,s) ) {
|
| 730 |
X strcpy(pat, str);
|
| 731 |
X return(1);
|
| 732 |
X }
|
| 733 |
X while (*s++);
|
| 734 |
X return(0);
|
| 735 |
X case '\\': /* literal next */
|
| 736 |
X p++;
|
| 737 |
X /* fall through */
|
| 738 |
X default: /* normal character */
|
| 739 |
X if (*p != *s)
|
| 740 |
X return(0);
|
| 741 |
X s++;
|
| 742 |
X break;
|
| 743 |
X }
|
| 744 |
X } while (*p++);
|
| 745 |
X if (docopy)
|
| 746 |
X strcpy(pat, str);
|
| 747 |
X return(1);
|
| 748 |
X}
|
| 749 |
X#else
|
| 750 |
X#define copymatch(pat, s) (!strcmp(pat, s))
|
| 751 |
X#endif
|
| 752 |
X
|
| 753 |
X
|
| 754 |
X/*
|
| 755 |
X * Checkheader(fin,fmt,fout) returns a value of 1 if the input format
|
| 756 |
X * matches the specification in fmt, 0 if no input format was found,
|
| 757 |
X * and -1 if the input format does not match or there is an
|
| 758 |
X * error reading the header. If fmt is empty, then -1 is returned
|
| 759 |
X * if any input format is found (or there is an error), and 0 otherwise.
|
| 760 |
X * If fmt contains any '*' or '?' characters, then checkheader
|
| 761 |
X * does wildcard expansion and copies a matching result into fmt.
|
| 762 |
X * Be sure that fmt is big enough to hold the match in such cases!
|
| 763 |
X * The input header (minus any format lines) is copied to fout
|
| 764 |
X * if fout is not NULL.
|
| 765 |
X */
|
| 766 |
X
|
| 767 |
Xcheckheader(fin, fmt, fout)
|
| 768 |
XFILE *fin;
|
| 769 |
Xchar *fmt;
|
| 770 |
XFILE *fout;
|
| 771 |
X{
|
| 772 |
X struct check cdat;
|
| 773 |
X
|
| 774 |
X cdat.fp = fout;
|
| 775 |
X cdat.fs[0] = '\0';
|
| 776 |
X if (getheader(fin, mycheck, &cdat) < 0)
|
| 777 |
X return(-1);
|
| 778 |
X if (cdat.fs[0] != '\0')
|
| 779 |
X return(copymatch(fmt, cdat.fs) ? 1 : -1);
|
| 780 |
X return(0);
|
| 781 |
X}
|
| 782 |
SHAR_EOF
|
| 783 |
fi
|
| 784 |
if test -f 'color.c'
|
| 785 |
then
|
| 786 |
echo shar: "will not over-write existing file 'color.c'"
|
| 787 |
else
|
| 788 |
sed 's/^X//' << \SHAR_EOF > 'color.c'
|
| 789 |
X/* Copyright (c) 1991 Regents of the University of California */
|
| 790 |
X
|
| 791 |
X#ifndef lint
|
| 792 |
Xstatic char SCCSid[] = "@(#)color.c 2.8 3/26/94 LBL";
|
| 793 |
X#endif
|
| 794 |
X
|
| 795 |
X/*
|
| 796 |
X * color.c - routines for color calculations.
|
| 797 |
X *
|
| 798 |
X * 10/10/85
|
| 799 |
X */
|
| 800 |
X
|
| 801 |
X#include <stdio.h>
|
| 802 |
X
|
| 803 |
X#include <math.h>
|
| 804 |
X
|
| 805 |
X#include "color.h"
|
| 806 |
X
|
| 807 |
X#define MINELEN 8 /* minimum scanline length for encoding */
|
| 808 |
X#define MAXELEN 0x7fff /* maximum scanline length for encoding */
|
| 809 |
X#define MINRUN 4 /* minimum run length */
|
| 810 |
X
|
| 811 |
X
|
| 812 |
Xchar *
|
| 813 |
Xtempbuffer(len) /* get a temporary buffer */
|
| 814 |
Xunsigned len;
|
| 815 |
X{
|
| 816 |
X extern char *malloc(), *realloc();
|
| 817 |
X static char *tempbuf = NULL;
|
| 818 |
X static unsigned tempbuflen = 0;
|
| 819 |
X
|
| 820 |
X if (len > tempbuflen) {
|
| 821 |
X if (tempbuflen > 0)
|
| 822 |
X tempbuf = realloc(tempbuf, len);
|
| 823 |
X else
|
| 824 |
X tempbuf = malloc(len);
|
| 825 |
X tempbuflen = tempbuf==NULL ? 0 : len;
|
| 826 |
X }
|
| 827 |
X return(tempbuf);
|
| 828 |
X}
|
| 829 |
X
|
| 830 |
X
|
| 831 |
Xfwritecolrs(scanline, len, fp) /* write out a colr scanline */
|
| 832 |
Xregister COLR *scanline;
|
| 833 |
Xunsigned len;
|
| 834 |
Xregister FILE *fp;
|
| 835 |
X{
|
| 836 |
X register int i, j, beg, cnt;
|
| 837 |
X int c2;
|
| 838 |
X
|
| 839 |
X if (len < MINELEN | len > MAXELEN) /* OOBs, write out flat */
|
| 840 |
X return(fwrite((char *)scanline,sizeof(COLR),len,fp) - len);
|
| 841 |
X /* put magic header */
|
| 842 |
X putc(2, fp);
|
| 843 |
X putc(2, fp);
|
| 844 |
X putc(len>>8, fp);
|
| 845 |
X putc(len&255, fp);
|
| 846 |
X /* put components seperately */
|
| 847 |
X for (i = 0; i < 4; i++) {
|
| 848 |
X for (j = 0; j < len; j += cnt) { /* find next run */
|
| 849 |
X for (beg = j; beg < len; beg += cnt) {
|
| 850 |
X for (cnt = 1; cnt < 127 && beg+cnt < len &&
|
| 851 |
X scanline[beg+cnt][i] == scanline[beg][i]; cnt++)
|
| 852 |
X ;
|
| 853 |
X if (cnt >= MINRUN)
|
| 854 |
X break; /* long enough */
|
| 855 |
X }
|
| 856 |
X if (beg-j > 1 && beg-j < MINRUN) {
|
| 857 |
X c2 = j+1;
|
| 858 |
X while (scanline[c2++][i] == scanline[j][i])
|
| 859 |
X if (c2 == beg) { /* short run */
|
| 860 |
X putc(128+beg-j, fp);
|
| 861 |
X putc(scanline[j][i], fp);
|
| 862 |
X j = beg;
|
| 863 |
X break;
|
| 864 |
X }
|
| 865 |
X }
|
| 866 |
X while (j < beg) { /* write out non-run */
|
| 867 |
X if ((c2 = beg-j) > 128) c2 = 128;
|
| 868 |
X putc(c2, fp);
|
| 869 |
X while (c2--)
|
| 870 |
X putc(scanline[j++][i], fp);
|
| 871 |
X }
|
| 872 |
X if (cnt >= MINRUN) { /* write out run */
|
| 873 |
X putc(128+cnt, fp);
|
| 874 |
X putc(scanline[beg][i], fp);
|
| 875 |
X } else
|
| 876 |
X cnt = 0;
|
| 877 |
X }
|
| 878 |
X }
|
| 879 |
X return(ferror(fp) ? -1 : 0);
|
| 880 |
X}
|
| 881 |
X
|
| 882 |
X
|
| 883 |
Xfreadcolrs(scanline, len, fp) /* read in an encoded colr scanline */
|
| 884 |
Xregister COLR *scanline;
|
| 885 |
Xint len;
|
| 886 |
Xregister FILE *fp;
|
| 887 |
X{
|
| 888 |
X register int i, j;
|
| 889 |
X int code, val;
|
| 890 |
X /* determine scanline type */
|
| 891 |
X if (len < MINELEN | len > MAXELEN)
|
| 892 |
X return(oldreadcolrs(scanline, len, fp));
|
| 893 |
X if ((i = getc(fp)) == EOF)
|
| 894 |
X return(-1);
|
| 895 |
X if (i != 2) {
|
| 896 |
X ungetc(i, fp);
|
| 897 |
X return(oldreadcolrs(scanline, len, fp));
|
| 898 |
X }
|
| 899 |
X scanline[0][GRN] = getc(fp);
|
| 900 |
X scanline[0][BLU] = getc(fp);
|
| 901 |
X if ((i = getc(fp)) == EOF)
|
| 902 |
X return(-1);
|
| 903 |
X if (scanline[0][GRN] != 2 || scanline[0][BLU] & 128) {
|
| 904 |
X scanline[0][RED] = 2;
|
| 905 |
X scanline[0][EXP] = i;
|
| 906 |
X return(oldreadcolrs(scanline+1, len-1, fp));
|
| 907 |
X }
|
| 908 |
X if ((scanline[0][BLU]<<8 | i) != len)
|
| 909 |
X return(-1); /* length mismatch! */
|
| 910 |
X /* read each component */
|
| 911 |
X for (i = 0; i < 4; i++)
|
| 912 |
X for (j = 0; j < len; ) {
|
| 913 |
X if ((code = getc(fp)) == EOF)
|
| 914 |
X return(-1);
|
| 915 |
X if (code > 128) { /* run */
|
| 916 |
X code &= 127;
|
| 917 |
X val = getc(fp);
|
| 918 |
X while (code--)
|
| 919 |
X scanline[j++][i] = val;
|
| 920 |
X } else /* non-run */
|
| 921 |
X while (code--)
|
| 922 |
X scanline[j++][i] = getc(fp);
|
| 923 |
X }
|
| 924 |
X return(feof(fp) ? -1 : 0);
|
| 925 |
X}
|
| 926 |
X
|
| 927 |
X
|
| 928 |
Xoldreadcolrs(scanline, len, fp) /* read in an old colr scanline */
|
| 929 |
Xregister COLR *scanline;
|
| 930 |
Xint len;
|
| 931 |
Xregister FILE *fp;
|
| 932 |
X{
|
| 933 |
X int rshift;
|
| 934 |
X register int i;
|
| 935 |
X
|
| 936 |
X rshift = 0;
|
| 937 |
X
|
| 938 |
X while (len > 0) {
|
| 939 |
X scanline[0][RED] = getc(fp);
|
| 940 |
X scanline[0][GRN] = getc(fp);
|
| 941 |
X scanline[0][BLU] = getc(fp);
|
| 942 |
X scanline[0][EXP] = getc(fp);
|
| 943 |
X if (feof(fp) || ferror(fp))
|
| 944 |
X return(-1);
|
| 945 |
X if (scanline[0][RED] == 1 &&
|
| 946 |
X scanline[0][GRN] == 1 &&
|
| 947 |
X scanline[0][BLU] == 1) {
|
| 948 |
X for (i = scanline[0][EXP] << rshift; i > 0; i--) {
|
| 949 |
X copycolr(scanline[0], scanline[-1]);
|
| 950 |
X scanline++;
|
| 951 |
X len--;
|
| 952 |
X }
|
| 953 |
X rshift += 8;
|
| 954 |
X } else {
|
| 955 |
X scanline++;
|
| 956 |
X len--;
|
| 957 |
X rshift = 0;
|
| 958 |
X }
|
| 959 |
X }
|
| 960 |
X return(0);
|
| 961 |
X}
|
| 962 |
X
|
| 963 |
X
|
| 964 |
Xfwritescan(scanline, len, fp) /* write out a scanline */
|
| 965 |
Xregister COLOR *scanline;
|
| 966 |
Xint len;
|
| 967 |
XFILE *fp;
|
| 968 |
X{
|
| 969 |
X COLR *clrscan;
|
| 970 |
X int n;
|
| 971 |
X register COLR *sp;
|
| 972 |
X /* get scanline buffer */
|
| 973 |
X if ((sp = (COLR *)tempbuffer(len*sizeof(COLR))) == NULL)
|
| 974 |
X return(-1);
|
| 975 |
X clrscan = sp;
|
| 976 |
X /* convert scanline */
|
| 977 |
X n = len;
|
| 978 |
X while (n-- > 0) {
|
| 979 |
X setcolr(sp[0], scanline[0][RED],
|
| 980 |
X scanline[0][GRN],
|
| 981 |
X scanline[0][BLU]);
|
| 982 |
X scanline++;
|
| 983 |
X sp++;
|
| 984 |
X }
|
| 985 |
X return(fwritecolrs(clrscan, len, fp));
|
| 986 |
X}
|
| 987 |
X
|
| 988 |
X
|
| 989 |
Xfreadscan(scanline, len, fp) /* read in a scanline */
|
| 990 |
Xregister COLOR *scanline;
|
| 991 |
Xint len;
|
| 992 |
XFILE *fp;
|
| 993 |
X{
|
| 994 |
X register COLR *clrscan;
|
| 995 |
X
|
| 996 |
X if ((clrscan = (COLR *)tempbuffer(len*sizeof(COLR))) == NULL)
|
| 997 |
X return(-1);
|
| 998 |
X if (freadcolrs(clrscan, len, fp) < 0)
|
| 999 |
X return(-1);
|
| 1000 |
X /* convert scanline */
|
| 1001 |
X colr_color(scanline[0], clrscan[0]);
|
| 1002 |
X while (--len > 0) {
|
| 1003 |
X scanline++; clrscan++;
|
| 1004 |
X if (clrscan[0][RED] == clrscan[-1][RED] &&
|
| 1005 |
X clrscan[0][GRN] == clrscan[-1][GRN] &&
|
| 1006 |
X clrscan[0][BLU] == clrscan[-1][BLU] &&
|
| 1007 |
X clrscan[0][EXP] == clrscan[-1][EXP])
|
| 1008 |
X copycolor(scanline[0], scanline[-1]);
|
| 1009 |
X else
|
| 1010 |
X colr_color(scanline[0], clrscan[0]);
|
| 1011 |
X }
|
| 1012 |
X return(0);
|
| 1013 |
X}
|
| 1014 |
X
|
| 1015 |
X
|
| 1016 |
Xsetcolr(clr, r, g, b) /* assign a short color value */
|
| 1017 |
Xregister COLR clr;
|
| 1018 |
Xdouble r, g, b;
|
| 1019 |
X{
|
| 1020 |
X double d;
|
| 1021 |
X int e;
|
| 1022 |
X
|
| 1023 |
X d = r > g ? r : g;
|
| 1024 |
X if (b > d) d = b;
|
| 1025 |
X
|
| 1026 |
X if (d <= 1e-32) {
|
| 1027 |
X clr[RED] = clr[GRN] = clr[BLU] = 0;
|
| 1028 |
X clr[EXP] = 0;
|
| 1029 |
X return;
|
| 1030 |
X }
|
| 1031 |
X
|
| 1032 |
X d = frexp(d, &e) * 255.9999 / d;
|
| 1033 |
X
|
| 1034 |
X clr[RED] = r * d;
|
| 1035 |
X clr[GRN] = g * d;
|
| 1036 |
X clr[BLU] = b * d;
|
| 1037 |
X clr[EXP] = e + COLXS;
|
| 1038 |
X}
|
| 1039 |
X
|
| 1040 |
X
|
| 1041 |
Xcolr_color(col, clr) /* convert short to float color */
|
| 1042 |
Xregister COLOR col;
|
| 1043 |
Xregister COLR clr;
|
| 1044 |
X{
|
| 1045 |
X double f;
|
| 1046 |
X
|
| 1047 |
X if (clr[EXP] == 0)
|
| 1048 |
X col[RED] = col[GRN] = col[BLU] = 0.0;
|
| 1049 |
X else {
|
| 1050 |
X f = ldexp(1.0, (int)clr[EXP]-(COLXS+8));
|
| 1051 |
X col[RED] = (clr[RED] + 0.5)*f;
|
| 1052 |
X col[GRN] = (clr[GRN] + 0.5)*f;
|
| 1053 |
X col[BLU] = (clr[BLU] + 0.5)*f;
|
| 1054 |
X }
|
| 1055 |
X}
|
| 1056 |
X
|
| 1057 |
X
|
| 1058 |
Xbigdiff(c1, c2, md) /* c1 delta c2 > md? */
|
| 1059 |
Xregister COLOR c1, c2;
|
| 1060 |
Xdouble md;
|
| 1061 |
X{
|
| 1062 |
X register int i;
|
| 1063 |
X
|
| 1064 |
X for (i = 0; i < 3; i++)
|
| 1065 |
X if (colval(c1,i)-colval(c2,i) > md*colval(c2,i) ||
|
| 1066 |
X colval(c2,i)-colval(c1,i) > md*colval(c1,i))
|
| 1067 |
X return(1);
|
| 1068 |
X return(0);
|
| 1069 |
X}
|
| 1070 |
SHAR_EOF
|
| 1071 |
fi
|
| 1072 |
if test -f 'colrops.c'
|
| 1073 |
then
|
| 1074 |
echo shar: "will not over-write existing file 'colrops.c'"
|
| 1075 |
else
|
| 1076 |
sed 's/^X//' << \SHAR_EOF > 'colrops.c'
|
| 1077 |
X/* Copyright (c) 1992 Regents of the University of California */
|
| 1078 |
X
|
| 1079 |
X#ifndef lint
|
| 1080 |
Xstatic char SCCSid[] = "@(#)colrops.c 2.4 10/2/92 LBL";
|
| 1081 |
X#endif
|
| 1082 |
X
|
| 1083 |
X/*
|
| 1084 |
X * Integer operations on COLR scanlines
|
| 1085 |
X */
|
| 1086 |
X
|
| 1087 |
X#include "color.h"
|
| 1088 |
X
|
| 1089 |
X#define NULL 0
|
| 1090 |
X
|
| 1091 |
Xextern char *bmalloc();
|
| 1092 |
X
|
| 1093 |
X#define MAXGSHIFT 31 /* maximum shift for gamma table */
|
| 1094 |
X
|
| 1095 |
Xstatic BYTE *g_mant = NULL, *g_nexp = NULL;
|
| 1096 |
X
|
| 1097 |
Xstatic BYTE (*g_bval)[256] = NULL;
|
| 1098 |
X
|
| 1099 |
X#ifndef pow
|
| 1100 |
Xextern double pow();
|
| 1101 |
X#endif
|
| 1102 |
X
|
| 1103 |
X
|
| 1104 |
Xsetcolrcor(f, a2) /* set brightness correction */
|
| 1105 |
Xdouble (*f)();
|
| 1106 |
Xdouble a2;
|
| 1107 |
X{
|
| 1108 |
X double mult;
|
| 1109 |
X register int i, j;
|
| 1110 |
X /* allocate tables */
|
| 1111 |
X if (g_bval == NULL && (g_bval =
|
| 1112 |
X (BYTE (*)[256])bmalloc((MAXGSHIFT+1)*256)) == NULL)
|
| 1113 |
X return(-1);
|
| 1114 |
X /* compute colr -> gamb mapping */
|
| 1115 |
X mult = 1.0/256.0;
|
| 1116 |
X for (i = 0; i <= MAXGSHIFT; i++) {
|
| 1117 |
X for (j = 0; j < 256; j++)
|
| 1118 |
X g_bval[i][j] = 256.0 * (*f)((j+.5)*mult, a2);
|
| 1119 |
X mult *= 0.5;
|
| 1120 |
X }
|
| 1121 |
X return(0);
|
| 1122 |
X}
|
| 1123 |
X
|
| 1124 |
X
|
| 1125 |
Xsetcolrinv(f, a2) /* set inverse brightness correction */
|
| 1126 |
Xdouble (*f)();
|
| 1127 |
Xdouble a2;
|
| 1128 |
X{
|
| 1129 |
X double mult;
|
| 1130 |
X register int i, j;
|
| 1131 |
X /* allocate tables */
|
| 1132 |
X if (g_mant == NULL && (g_mant = (BYTE *)bmalloc(256)) == NULL)
|
| 1133 |
X return(-1);
|
| 1134 |
X if (g_nexp == NULL && (g_nexp = (BYTE *)bmalloc(256)) == NULL)
|
| 1135 |
X return(-1);
|
| 1136 |
X /* compute gamb -> colr mapping */
|
| 1137 |
X i = 0;
|
| 1138 |
X mult = 256.0;
|
| 1139 |
X for (j = 255; j > 0; j--) {
|
| 1140 |
X while ((g_mant[j] = mult * (*f)(j/256.0, a2)) < 128) {
|
| 1141 |
X i++;
|
| 1142 |
X mult *= 2.0;
|
| 1143 |
X }
|
| 1144 |
X g_nexp[j] = i;
|
| 1145 |
X }
|
| 1146 |
X g_mant[0] = 0;
|
| 1147 |
X g_nexp[0] = COLXS;
|
| 1148 |
X return(0);
|
| 1149 |
X}
|
| 1150 |
X
|
| 1151 |
X
|
| 1152 |
Xsetcolrgam(g) /* set gamma conversion */
|
| 1153 |
Xdouble g;
|
| 1154 |
X{
|
| 1155 |
X if (setcolrcor(pow, 1.0/g) < 0)
|
| 1156 |
X return(-1);
|
| 1157 |
X return(setcolrinv(pow, g));
|
| 1158 |
X}
|
| 1159 |
X
|
| 1160 |
X
|
| 1161 |
Xcolrs_gambs(scan, len) /* convert scanline of colrs to gamma bytes */
|
| 1162 |
Xregister COLR *scan;
|
| 1163 |
Xint len;
|
| 1164 |
X{
|
| 1165 |
X register int i, expo;
|
| 1166 |
X
|
| 1167 |
X if (g_bval == NULL)
|
| 1168 |
X return(-1);
|
| 1169 |
X while (len-- > 0) {
|
| 1170 |
X expo = scan[0][EXP] - COLXS;
|
| 1171 |
X if (expo < -MAXGSHIFT) {
|
| 1172 |
X if (expo < -MAXGSHIFT-8) {
|
| 1173 |
X scan[0][RED] =
|
| 1174 |
X scan[0][GRN] =
|
| 1175 |
X scan[0][BLU] = 0;
|
| 1176 |
X } else {
|
| 1177 |
X i = (-MAXGSHIFT-1) - expo;
|
| 1178 |
X scan[0][RED] =
|
| 1179 |
X g_bval[MAXGSHIFT][((scan[0][RED]>>i)+1)>>1];
|
| 1180 |
X scan[0][GRN] =
|
| 1181 |
X g_bval[MAXGSHIFT][((scan[0][GRN]>>i)+1)>>1];
|
| 1182 |
X scan[0][BLU] =
|
| 1183 |
X g_bval[MAXGSHIFT][((scan[0][BLU]>>i)+1)>>1];
|
| 1184 |
X }
|
| 1185 |
X } else if (expo > 0) {
|
| 1186 |
X if (expo > 8) {
|
| 1187 |
X scan[0][RED] =
|
| 1188 |
X scan[0][GRN] =
|
| 1189 |
X scan[0][BLU] = 255;
|
| 1190 |
X } else {
|
| 1191 |
X i = (scan[0][RED]<<1 | 1) << (expo-1);
|
| 1192 |
X scan[0][RED] = i > 255 ? 255 : g_bval[0][i];
|
| 1193 |
X i = (scan[0][GRN]<<1 | 1) << (expo-1);
|
| 1194 |
X scan[0][GRN] = i > 255 ? 255 : g_bval[0][i];
|
| 1195 |
X i = (scan[0][BLU]<<1 | 1) << (expo-1);
|
| 1196 |
X scan[0][BLU] = i > 255 ? 255 : g_bval[0][i];
|
| 1197 |
X }
|
| 1198 |
X } else {
|
| 1199 |
X scan[0][RED] = g_bval[-expo][scan[0][RED]];
|
| 1200 |
X scan[0][GRN] = g_bval[-expo][scan[0][GRN]];
|
| 1201 |
X scan[0][BLU] = g_bval[-expo][scan[0][BLU]];
|
| 1202 |
X }
|
| 1203 |
X scan[0][EXP] = COLXS;
|
| 1204 |
X scan++;
|
| 1205 |
X }
|
| 1206 |
X return(0);
|
| 1207 |
X}
|
| 1208 |
X
|
| 1209 |
X
|
| 1210 |
Xgambs_colrs(scan, len) /* convert gamma bytes to colr scanline */
|
| 1211 |
Xregister COLR *scan;
|
| 1212 |
Xint len;
|
| 1213 |
X{
|
| 1214 |
X register int nexpo;
|
| 1215 |
X
|
| 1216 |
X if (g_mant == NULL | g_nexp == NULL)
|
| 1217 |
X return(-1);
|
| 1218 |
X while (len-- > 0) {
|
| 1219 |
X nexpo = g_nexp[scan[0][RED]];
|
| 1220 |
X if (g_nexp[scan[0][GRN]] < nexpo)
|
| 1221 |
X nexpo = g_nexp[scan[0][GRN]];
|
| 1222 |
X if (g_nexp[scan[0][BLU]] < nexpo)
|
| 1223 |
X nexpo = g_nexp[scan[0][BLU]];
|
| 1224 |
X if (nexpo < g_nexp[scan[0][RED]])
|
| 1225 |
X scan[0][RED] = g_mant[scan[0][RED]]
|
| 1226 |
X >> (g_nexp[scan[0][RED]]-nexpo);
|
| 1227 |
X else
|
| 1228 |
X scan[0][RED] = g_mant[scan[0][RED]];
|
| 1229 |
X if (nexpo < g_nexp[scan[0][GRN]])
|
| 1230 |
X scan[0][GRN] = g_mant[scan[0][GRN]]
|
| 1231 |
X >> (g_nexp[scan[0][GRN]]-nexpo);
|
| 1232 |
X else
|
| 1233 |
X scan[0][GRN] = g_mant[scan[0][GRN]];
|
| 1234 |
X if (nexpo < g_nexp[scan[0][BLU]])
|
| 1235 |
X scan[0][BLU] = g_mant[scan[0][BLU]]
|
| 1236 |
X >> (g_nexp[scan[0][BLU]]-nexpo);
|
| 1237 |
X else
|
| 1238 |
X scan[0][BLU] = g_mant[scan[0][BLU]];
|
| 1239 |
X scan[0][EXP] = COLXS - nexpo;
|
| 1240 |
X scan++;
|
| 1241 |
X }
|
| 1242 |
X return(0);
|
| 1243 |
X}
|
| 1244 |
X
|
| 1245 |
X
|
| 1246 |
Xshiftcolrs(scan, len, adjust) /* shift a scanline of colors by 2^adjust */
|
| 1247 |
Xregister COLR *scan;
|
| 1248 |
Xregister int len;
|
| 1249 |
Xregister int adjust;
|
| 1250 |
X{
|
| 1251 |
X int minexp;
|
| 1252 |
X
|
| 1253 |
X if (adjust == 0)
|
| 1254 |
X return;
|
| 1255 |
X minexp = adjust < 0 ? -adjust : 0;
|
| 1256 |
X while (len-- > 0) {
|
| 1257 |
X if (scan[0][EXP] <= minexp)
|
| 1258 |
X scan[0][RED] = scan[0][GRN] = scan[0][BLU] =
|
| 1259 |
X scan[0][EXP] = 0;
|
| 1260 |
X else
|
| 1261 |
X scan[0][EXP] += adjust;
|
| 1262 |
X scan++;
|
| 1263 |
X }
|
| 1264 |
X}
|
| 1265 |
X
|
| 1266 |
X
|
| 1267 |
Xnormcolrs(scan, len, adjust) /* normalize a scanline of colrs */
|
| 1268 |
Xregister COLR *scan;
|
| 1269 |
Xint len;
|
| 1270 |
Xint adjust;
|
| 1271 |
X{
|
| 1272 |
X register int c;
|
| 1273 |
X register int shift;
|
| 1274 |
X
|
| 1275 |
X while (len-- > 0) {
|
| 1276 |
X shift = scan[0][EXP] + adjust - COLXS;
|
| 1277 |
X if (shift > 0) {
|
| 1278 |
X if (shift > 8) {
|
| 1279 |
X scan[0][RED] =
|
| 1280 |
X scan[0][GRN] =
|
| 1281 |
X scan[0][BLU] = 255;
|
| 1282 |
X } else {
|
| 1283 |
X shift--;
|
| 1284 |
X c = (scan[0][RED]<<1 | 1) << shift;
|
| 1285 |
X scan[0][RED] = c > 255 ? 255 : c;
|
| 1286 |
X c = (scan[0][GRN]<<1 | 1) << shift;
|
| 1287 |
X scan[0][GRN] = c > 255 ? 255 : c;
|
| 1288 |
X c = (scan[0][BLU]<<1 | 1) << shift;
|
| 1289 |
X scan[0][BLU] = c > 255 ? 255 : c;
|
| 1290 |
X }
|
| 1291 |
X } else if (shift < 0) {
|
| 1292 |
X if (shift < -8) {
|
| 1293 |
X scan[0][RED] =
|
| 1294 |
X scan[0][GRN] =
|
| 1295 |
X scan[0][BLU] = 0;
|
| 1296 |
X } else {
|
| 1297 |
X shift = -1-shift;
|
| 1298 |
X scan[0][RED] = ((scan[0][RED]>>shift)+1)>>1;
|
| 1299 |
X scan[0][GRN] = ((scan[0][GRN]>>shift)+1)>>1;
|
| 1300 |
X scan[0][BLU] = ((scan[0][BLU]>>shift)+1)>>1;
|
| 1301 |
X }
|
| 1302 |
X }
|
| 1303 |
X scan[0][EXP] = COLXS - adjust;
|
| 1304 |
X scan++;
|
| 1305 |
X }
|
| 1306 |
X}
|
| 1307 |
SHAR_EOF
|
| 1308 |
fi
|
| 1309 |
exit 0
|
| 1310 |
# End of shell archive
|
