| 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 -lrt -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 -lrt 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 |
