| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id$"; |
| 3 |
#endif |
| 4 |
/*********************************************************************** |
| 5 |
* Author: Philip Thompson ([email protected]) |
| 6 |
* - convert from RADIANCE image file format to Xim and vice-versa. |
| 7 |
* Copyright (c) 1990, Massachusetts Institute of Technology |
| 8 |
* Philip R. Thompson ([email protected]) |
| 9 |
* Computer Resource Laboratory (CRL) |
| 10 |
* Dept. of Architecture and Planning |
| 11 |
* M.I.T., Rm 9-526 |
| 12 |
* Cambridge, MA 02139 |
| 13 |
* This software and its documentation may be used, copied, modified, |
| 14 |
* and distributed for any purpose without fee, provided: |
| 15 |
* -- The above copyright notice appears in all copies. |
| 16 |
* -- This disclaimer appears in all source code copies. |
| 17 |
* -- The names of M.I.T. and the CRL are not used in advertising |
| 18 |
* or publicity pertaining to distribution of the software |
| 19 |
* without prior specific written permission from me or CRL. |
| 20 |
* I provide this software freely as a public service. It is NOT |
| 21 |
* public domain nor a commercial product, and therefore is not subject |
| 22 |
* to an an implied warranty of merchantability or fitness for a |
| 23 |
* particular purpose. I provide it as is, without warranty. |
| 24 |
* This software is furnished only on the basis that any party who |
| 25 |
* receives it indemnifies and holds harmless the parties who furnish |
| 26 |
* it against any claims, demands, or liabilities connected with using |
| 27 |
* it, furnishing it to others, or providing it to a third party. |
| 28 |
***********************************************************************/ |
| 29 |
#if (!defined(lint) && !defined(SABER)) |
| 30 |
static char radiance_rcsid[] = |
| 31 |
"$Header: /mit/phils/X/lib/RCS/radiance_io.c,v 1.2 90/09/10 14:37:21 phils Exp Locker: phils $"; |
| 32 |
#endif |
| 33 |
|
| 34 |
#include <stdio.h> |
| 35 |
#include <math.h> |
| 36 |
#include <pwd.h> |
| 37 |
#include <sys/types.h> |
| 38 |
#ifdef SYSV |
| 39 |
#include <string.h> |
| 40 |
#else |
| 41 |
#include <strings.h> |
| 42 |
#include <sys/time.h> |
| 43 |
#endif |
| 44 |
|
| 45 |
/* XimHeader.h */ |
| 46 |
|
| 47 |
/* |
| 48 |
* Author: Philip R. Thompson |
| 49 |
* Address: [email protected], 9-526 |
| 50 |
* $Header: /mit/phils/X/RCS/XimHeader.h,v 1.11 90/08/09 20:48:33 phils Exp Locker: phils $ |
| 51 |
* $Date: 90/08/09 20:48:33 $ |
| 52 |
* $Source: /mit/phils/X/RCS/XimHeader.h,v $ |
| 53 |
* Copyright (c) 1989, 1990 Massachusetts Institute of Technology |
| 54 |
* 1988, Philip R. Thompson ([email protected]) |
| 55 |
* Computer Resource Laboratory (CRL) |
| 56 |
* Dept. of Architecture and Planning |
| 57 |
* M.I.T., Rm 9-526 |
| 58 |
* Cambridge, MA 02139 |
| 59 |
* This software and its documentation may be used, copied, modified, |
| 60 |
* and distributed for any purpose without fee, provided: |
| 61 |
* -- The above copyright notice appears in all copies. |
| 62 |
* -- This disclaimer appears in all source code copies. |
| 63 |
* -- The names of M.I.T. and the CRL are not used in advertising |
| 64 |
* or publicity pertaining to distribution of the software |
| 65 |
* without prior specific written permission from me or CRL. |
| 66 |
* I provide this software freely as a public service. It is NOT |
| 67 |
* public domain nor a commercial product, and therefore is not subject |
| 68 |
* to an an implied warranty of merchantability or fitness for a |
| 69 |
* particular purpose. I provide it as is, without warranty. |
| 70 |
* |
| 71 |
* This software is furnished only on the basis that any party who |
| 72 |
* receives it indemnifies and holds harmless the parties who furnish |
| 73 |
* it against any claims, demands, or liabilities connected with using |
| 74 |
* it, furnishing it to others, or providing it to a third party. |
| 75 |
*/ |
| 76 |
|
| 77 |
#define IMAGE_VERSION 3 |
| 78 |
#ifndef _BYTE |
| 79 |
typedef unsigned char byte; |
| 80 |
#define _BYTE 1 |
| 81 |
#endif |
| 82 |
#include <sys/types.h> |
| 83 |
|
| 84 |
|
| 85 |
/* External ascii file format |
| 86 |
* Note: size of header should be 1024 (1K) bytes. |
| 87 |
*/ |
| 88 |
typedef struct ImageHeader { |
| 89 |
char file_version[8]; /* header version */ |
| 90 |
char header_size[8]; /* Size of file header in bytes (1024) */ |
| 91 |
char image_width[8]; /* Width of the raster image */ |
| 92 |
char image_height[8]; /* Height of the raster imgage */ |
| 93 |
char num_colors[4]; /* Actual number of entries in c_map */ |
| 94 |
char greyscale[2]; /* Flag if no c_map needed */ |
| 95 |
char flag[2]; /* Not used */ |
| 96 |
char num_channels[3]; /* 0 or 1 = pixmap, 3 = RG&B buffers */ |
| 97 |
char bytes_per_line[5]; /* bytes per scanline */ |
| 98 |
char num_pictures[4]; /* Number of pictures in file */ |
| 99 |
char bits_per_channel[4]; /* usually 1 or 8 */ |
| 100 |
char alpha_channel[4]; /* Alpha channel flag */ |
| 101 |
char runlength[4]; /* Runlength encoded flag */ |
| 102 |
char author[48]; /* Name of who made it */ |
| 103 |
char date[32]; /* Date and time image was made */ |
| 104 |
char program[16]; /* Program that created this file */ |
| 105 |
char comment[96]; /* other viewing info. for this image */ |
| 106 |
unsigned char c_map[256][3]; /* RGB values of the pixmap indices */ |
| 107 |
} XimAsciiHeader; |
| 108 |
|
| 109 |
|
| 110 |
/* Internal binary format |
| 111 |
*/ |
| 112 |
typedef struct Color { |
| 113 |
byte red, grn, blu, pixel; |
| 114 |
} Color; |
| 115 |
|
| 116 |
typedef struct XimImage { |
| 117 |
int width; /* width of the image in pixels */ |
| 118 |
int height; /* height of the image in pixels */ |
| 119 |
int bytes_line; /* bytes to hold one scanline */ |
| 120 |
unsigned datasize; /* size of one channel of data */ |
| 121 |
short nchannels; /* data channels per pixel, usually 1 or3 */ |
| 122 |
short bits_channel; /* depth of a channel, usually 1 or 8 */ |
| 123 |
byte *data; /* pixmap or red channel data */ |
| 124 |
byte *grn_data; /* green channel data */ |
| 125 |
byte *blu_data; /* blue channel data */ |
| 126 |
byte *other; /* other (alpha) data */ |
| 127 |
short ncolors; /* number of colors in the color table */ |
| 128 |
Color *colors; /* colortable for pixmaps */ |
| 129 |
short curr_pic, npics; /* current & total file number of images */ |
| 130 |
unsigned alpha_flag: 1; /* alpha channel flag - "other" is used */ |
| 131 |
unsigned grey_flag : 1; /* is pixmap grey scaled */ |
| 132 |
unsigned packed_flag:1; /* is data packed in one chunk of memory */ |
| 133 |
unsigned runlen_flag:1; /* is data compressed flag (not used) */ |
| 134 |
unsigned : 0; /* future flags space and word alignment */ |
| 135 |
char *author; /* author credit, copyright, etc */ |
| 136 |
char *date; /* date image was made, grabbed, etc. */ |
| 137 |
char *program; /* program used to make this */ |
| 138 |
char *name; /* name of the image - usually filename */ |
| 139 |
short ncomments; /* number of comments strings */ |
| 140 |
char **comments; /* pointers to null terminated comments */ |
| 141 |
char *offset; /* original offset in memory when packed */ |
| 142 |
float gamcor; /* image storage gamma */ |
| 143 |
float chroma_red[2]; /* x, y image chromacity coords */ |
| 144 |
float chroma_grn[2]; |
| 145 |
float chroma_blu[2]; |
| 146 |
float chroma_wht[2]; |
| 147 |
} XimImage; |
| 148 |
|
| 149 |
|
| 150 |
/* Future external ascii variable length header - under review |
| 151 |
*/ |
| 152 |
#if (VERSION == 4) |
| 153 |
typedef struct XimAsciiHeader { |
| 154 |
char file_version[4]; /* header version */ |
| 155 |
char header_size[8]; /* Size of file header (fixed part only) */ |
| 156 |
char image_height[8]; /* Height of the raster imgage in pixels */ |
| 157 |
char image_width[8]; /* Width of the raster image in pixels */ |
| 158 |
char bytes_line[8]; /* Actual # of bytes separating scanlines */ |
| 159 |
char bits_channel[4]; /* Bits per channel (usually 1 or 8) */ |
| 160 |
char num_channels[4]; /* 1 = pixmap, 3 = RG&B buffers */ |
| 161 |
char alpha_channel[2]; /* Alpha channel flag */ |
| 162 |
char num_colors[4]; /* Number of entries in c_map (if any) */ |
| 163 |
char num_pictures[4]; /* Number of images in file */ |
| 164 |
char compress_flag[2]; /* Runlength encoded flag */ |
| 165 |
char greyscale_flag[2]; /* Greyscale flag */ |
| 166 |
char future_flags[4]; |
| 167 |
char author[48]; /* Name of who made it, from passwd entry */ |
| 168 |
char date[32]; /* Unix format date */ |
| 169 |
char program[32]; /* Program that created this */ |
| 170 |
char gamcor[12]; /* image storage gamma */ |
| 171 |
char chroma_red[24]; /* image red primary chromaticity coords. */ |
| 172 |
char chroma_grn[24]; /* " green " " " */ |
| 173 |
char chroma_blu[24]; /* " blue " " " */ |
| 174 |
char chroma_wht[24]; /* " white point " " */ |
| 175 |
char comment_length[8] /* Total length of all comments */ |
| 176 |
/* char *comment; Null separated comments */ |
| 177 |
/* byte c_map[]; RGB Colortable, (ncolors * 3 bytes) */ |
| 178 |
} XimAsciiHeader; |
| 179 |
#endif VERSION 4 |
| 180 |
|
| 181 |
#ifndef rnd |
| 182 |
#define rnd(x) ((int)((float)(x) + 0.5)) /* round a float to an int */ |
| 183 |
#endif |
| 184 |
|
| 185 |
/* Note: |
| 186 |
* - All external data is in char's in order to maintain easily |
| 187 |
* portability across machines and some human readibility. |
| 188 |
* - Images may be stored as bitmaps (8 pixels/byte), pixmaps |
| 189 |
* (1 byte /pixel) or as seperate red, green, blue channel data |
| 190 |
* (3 bytes/pixel). |
| 191 |
* - An alpha channel is optional and is found after every num_channels |
| 192 |
* of data. |
| 193 |
* - Pixmaps or RG&B (and alpha) channel data are stored respectively |
| 194 |
* after the header. |
| 195 |
* - If num_channels == 1 a pixmap is assumed and the colormap in the |
| 196 |
* header is used unless its greyscale. |
| 197 |
* - Datasize is for one channel. |
| 198 |
*/ |
| 199 |
|
| 200 |
/*** end ImageHeader.h ***/ |
| 201 |
|
| 202 |
#define XDECR 1 |
| 203 |
#define YDECR 2 |
| 204 |
#define YMAJOR 4 |
| 205 |
#define RED 0 |
| 206 |
#define GRN 1 |
| 207 |
#define BLU 2 |
| 208 |
#define EXP 3 |
| 209 |
#define MAXLINE 512 |
| 210 |
|
| 211 |
#define setcolor(col,r,g,b) (col[RED]=(r), col[GRN]=(g), col[BLU]=(b)) |
| 212 |
#define copycolr(c1,c2) (c1[0]=c2[0],c1[1]=c2[1], \ |
| 213 |
c1[2]=c2[2],c1[3]=c2[3]) |
| 214 |
#define copycolor(c1,c2) ((c1)[0]=(c2)[0],(c1)[1]=(c2)[1],\ |
| 215 |
(c1)[2]=(c2)[2]) |
| 216 |
#define COLXS 128 /* excess used for exponent */ |
| 217 |
typedef float COLOR[3]; /* red, green, blue */ |
| 218 |
typedef byte COLR[4]; /* red, green, blue, exponent */ |
| 219 |
|
| 220 |
#define FREE(a) if ((a) != NULL) free((char*)(a)), (a) = NULL |
| 221 |
|
| 222 |
char *AllocAndCopy(); |
| 223 |
extern debug_flag; |
| 224 |
static byte RadiancePixel(); |
| 225 |
|
| 226 |
|
| 227 |
XimReadRadiance(ifp, xim, gamcor) |
| 228 |
FILE *ifp; |
| 229 |
XimImage *xim; |
| 230 |
double gamcor; |
| 231 |
{ |
| 232 |
register int x, y, i; |
| 233 |
int width, height; |
| 234 |
COLOR *scanline; /* RADIANCE variable */ |
| 235 |
struct timeval time_val; |
| 236 |
struct timezone time_zone; |
| 237 |
struct passwd *getpwnam(), *getpwuid(), *pwd = NULL; |
| 238 |
char *login_ptr = NULL, *ctime(), *getlogin(); |
| 239 |
byte gmap[256]; |
| 240 |
|
| 241 |
/* get width, height from radiance file */ |
| 242 |
bzero(xim, sizeof(XimImage)); |
| 243 |
if (!RadianceGetSize(ifp, &width, &height)) |
| 244 |
return 0; |
| 245 |
xim->width = xim->bytes_line = width; |
| 246 |
xim->height = height; |
| 247 |
xim->nchannels = 3; |
| 248 |
xim->bits_channel = 8; |
| 249 |
xim->datasize = xim->height * xim->bytes_line; |
| 250 |
xim->npics = 1; |
| 251 |
xim->data = (byte *)malloc(xim->datasize); |
| 252 |
xim->grn_data = (byte *)malloc(xim->datasize); |
| 253 |
xim->blu_data = (byte *)malloc(xim->datasize); |
| 254 |
if (!xim->data || !xim->grn_data || !xim->blu_data) { |
| 255 |
FREE(xim->data); |
| 256 |
FREE(xim->grn_data); |
| 257 |
FREE(xim->blu_data); |
| 258 |
XimWarn("XimReadRadiance: can't malloc xim buffers"); |
| 259 |
return 0; |
| 260 |
} |
| 261 |
if (!(scanline = (COLOR*)malloc(width * sizeof(COLOR)))) { |
| 262 |
XimWarn("XimReadRadiance: can't malloc scanline"); |
| 263 |
return(0); |
| 264 |
} |
| 265 |
for (i=0; i < 256; i++) { |
| 266 |
gmap[i] = (byte)(0.5 + 255.0 * pow(i / 255.0, 1.0/gamcor)); |
| 267 |
if (debug_flag) |
| 268 |
fprintf(stderr, "%2d: %u\n", i, gmap[i]); |
| 269 |
} |
| 270 |
for (y=0, i=0; y < height; y++) { |
| 271 |
if (!freadscan(scanline, width, ifp)) { |
| 272 |
XimWarn("freadscan: read error"); |
| 273 |
free((char*)scanline); |
| 274 |
return 0; |
| 275 |
} |
| 276 |
for (x=0; x < width; x++, i++) { |
| 277 |
xim->data[i] = gmap[RadiancePixel(scanline[x], RED)]; |
| 278 |
xim->grn_data[i] = gmap[RadiancePixel(scanline[x], GRN)]; |
| 279 |
xim->blu_data[i] = gmap[RadiancePixel(scanline[x], BLU)]; |
| 280 |
} |
| 281 |
} |
| 282 |
free((char*)scanline); |
| 283 |
xim->comments = (char**)calloc(2, sizeof(char*)); |
| 284 |
xim->comments[0] =AllocAndCopy("converted from RADIANCE format",40); |
| 285 |
xim->ncomments = 1; |
| 286 |
(void)gettimeofday(&time_val, &time_zone); |
| 287 |
xim->date = ctime(&time_val.tv_sec); |
| 288 |
xim->date[strlen(xim->date)-1] = '\0'; |
| 289 |
/* date points to static memory, so copy it to make freeable */ |
| 290 |
xim->date = AllocAndCopy(xim->date, strlen(xim->date)+1); |
| 291 |
if ((login_ptr = getlogin()) != NULL) |
| 292 |
pwd = getpwnam(login_ptr); |
| 293 |
else |
| 294 |
pwd = getpwuid(getuid()); |
| 295 |
if (pwd && !(xim->author = AllocAndCopy(pwd->pw_gecos, |
| 296 |
strlen(pwd->pw_gecos)+1))) { |
| 297 |
XimWarn("XimReadXwdFile: Can't AllocAndCopy author's name"); |
| 298 |
return 0; |
| 299 |
} else |
| 300 |
xim->author = NULL; |
| 301 |
return 1; |
| 302 |
} |
| 303 |
|
| 304 |
|
| 305 |
XimWriteRadiance(ofp, xim, gamcor) |
| 306 |
FILE *ofp; |
| 307 |
XimImage *xim; |
| 308 |
double gamcor; |
| 309 |
{ |
| 310 |
COLOR *scanline; |
| 311 |
int width, height; |
| 312 |
register int x, y; |
| 313 |
register byte *red, *grn, *blu; |
| 314 |
float gmap[256]; |
| 315 |
|
| 316 |
/* get width, height from xim */ |
| 317 |
width = xim->width; |
| 318 |
height = xim->height; |
| 319 |
|
| 320 |
/* allocate scan line space */ |
| 321 |
if (!(scanline = (COLOR *)malloc(width * sizeof(COLOR)))) { |
| 322 |
XimWarn("XimWriteRadiance: cant' alloc scanline"); |
| 323 |
return(0); |
| 324 |
} |
| 325 |
/* write out the RADIANCE header */ |
| 326 |
radiance_writeheader(ofp, width, height); |
| 327 |
red = xim->data; |
| 328 |
grn = xim->grn_data; |
| 329 |
blu = xim->blu_data; |
| 330 |
for (x=0; x < 256; x++) { |
| 331 |
gmap[x] = (float)pow((x / 255.0), gamcor); |
| 332 |
if (debug_flag) |
| 333 |
fprintf(stderr, "%2d: %f\n", x, gmap[x]); |
| 334 |
} |
| 335 |
for (y = 0; y < height; y++) { |
| 336 |
for (x = 0; x < width; x++) |
| 337 |
setcolor(scanline[x], gmap[red[x]], gmap[grn[x]], gmap[blu[x]]); |
| 338 |
radiance_writescanline(ofp, scanline, width); |
| 339 |
red += xim->bytes_line; |
| 340 |
grn += xim->bytes_line; |
| 341 |
blu += xim->bytes_line; |
| 342 |
} |
| 343 |
return 1; |
| 344 |
} |
| 345 |
|
| 346 |
static RadianceGetSize(fp, w, h) |
| 347 |
FILE *fp; |
| 348 |
int *w, *h; |
| 349 |
{ |
| 350 |
if (!GetHeader(fp, NULL)) |
| 351 |
return 0; |
| 352 |
if (fgetresolu(w, h, fp) != (YMAJOR | YDECR)) { |
| 353 |
fprintf(stderr, "bad RADIANCE format\n"); |
| 354 |
return 0; |
| 355 |
} |
| 356 |
return 1; |
| 357 |
} |
| 358 |
|
| 359 |
static byte RadiancePixel(pixel, chan) |
| 360 |
COLOR pixel; |
| 361 |
int chan; |
| 362 |
{ |
| 363 |
float value; |
| 364 |
|
| 365 |
value = pixel[chan]; |
| 366 |
if (value <= 0.0) |
| 367 |
return (byte)0; |
| 368 |
else if (value >= 1.0) |
| 369 |
return (byte)255; |
| 370 |
return (byte)((int)((value * 256.0))); |
| 371 |
} |
| 372 |
|
| 373 |
static radiance_writeheader(fp, x, y) |
| 374 |
FILE *fp; |
| 375 |
int x; |
| 376 |
int y; |
| 377 |
{ |
| 378 |
fputc('\n', fp); |
| 379 |
fputresolu(YMAJOR | YDECR, x, y, fp); |
| 380 |
fflush(fp); |
| 381 |
} |
| 382 |
|
| 383 |
|
| 384 |
radiance_writescanline(fp, buf, x) |
| 385 |
FILE *fp; |
| 386 |
COLOR *buf; |
| 387 |
int x; |
| 388 |
{ |
| 389 |
if (fwritescan(buf, x, fp) < 0) { |
| 390 |
fprintf(stderr, "write error?\n"); |
| 391 |
perror("fwrite"); |
| 392 |
exit(1); |
| 393 |
} |
| 394 |
} |
| 395 |
|
| 396 |
|
| 397 |
freadscan(scanline, len, fp) /* read in a scanline */ |
| 398 |
register COLOR *scanline; |
| 399 |
int len; |
| 400 |
register FILE *fp; |
| 401 |
{ |
| 402 |
COLR thiscolr; |
| 403 |
int rshift; |
| 404 |
register int i; |
| 405 |
|
| 406 |
rshift = 0; |
| 407 |
while (len > 0) { |
| 408 |
thiscolr[RED] = getc(fp); |
| 409 |
thiscolr[GRN] = getc(fp); |
| 410 |
thiscolr[BLU] = getc(fp); |
| 411 |
thiscolr[EXP] = getc(fp); |
| 412 |
if (feof(fp) || ferror(fp)) |
| 413 |
return 0; |
| 414 |
if (thiscolr[RED] == 1 && |
| 415 |
thiscolr[GRN] == 1 && |
| 416 |
thiscolr[BLU] == 1) { |
| 417 |
for (i = thiscolr[EXP] << rshift; i > 0; i--) { |
| 418 |
copycolor(scanline[0], scanline[-1]); |
| 419 |
scanline++; |
| 420 |
len--; |
| 421 |
} |
| 422 |
rshift += 8; |
| 423 |
} else { |
| 424 |
colr_color(scanline[0], thiscolr); |
| 425 |
scanline++; |
| 426 |
len--; |
| 427 |
rshift = 0; |
| 428 |
} |
| 429 |
} |
| 430 |
return 1; |
| 431 |
} |
| 432 |
|
| 433 |
|
| 434 |
colr_color(col, clr) /* convert short to float color */ |
| 435 |
register COLOR col; |
| 436 |
register COLR clr; |
| 437 |
{ |
| 438 |
double f; |
| 439 |
|
| 440 |
if (clr[EXP] == 0) |
| 441 |
col[RED] = col[GRN] = col[BLU] = 0.0; |
| 442 |
else { |
| 443 |
f = ldexp(1.0, (int) clr[EXP] - (COLXS + 8)); |
| 444 |
col[RED] = (clr[RED] + 0.5) * f; |
| 445 |
col[GRN] = (clr[GRN] + 0.5) * f; |
| 446 |
col[BLU] = (clr[BLU] + 0.5) * f; |
| 447 |
} |
| 448 |
} |
| 449 |
|
| 450 |
static GetHeader(fp, f) /* get header from file */ |
| 451 |
FILE *fp; |
| 452 |
int (*f)(); |
| 453 |
{ |
| 454 |
char buf[MAXLINE]; |
| 455 |
|
| 456 |
for (;;) { |
| 457 |
buf[MAXLINE - 2] = '\n'; |
| 458 |
if (fgets(buf, sizeof(buf), fp) == NULL) |
| 459 |
return (-1); |
| 460 |
if (buf[0] == '\n') |
| 461 |
return 1; |
| 462 |
if (buf[MAXLINE - 2] != '\n') { |
| 463 |
ungetc(buf[MAXLINE - 2], fp); /* prevent false end */ |
| 464 |
buf[MAXLINE - 2] = '\0'; |
| 465 |
} |
| 466 |
if (f != NULL) |
| 467 |
(*f)(buf); |
| 468 |
} |
| 469 |
} |
| 470 |
|
| 471 |
|
| 472 |
static fgetresolu(xrp, yrp, fp) /* get x and y resolution */ |
| 473 |
int *xrp, *yrp; |
| 474 |
FILE *fp; |
| 475 |
{ |
| 476 |
char buf[64], *xndx, *yndx; |
| 477 |
register char *cp; |
| 478 |
register int ord; |
| 479 |
|
| 480 |
if (fgets(buf, sizeof(buf), fp) == NULL) |
| 481 |
return (-1); |
| 482 |
xndx = yndx = NULL; |
| 483 |
for (cp = buf + 1; *cp; cp++) |
| 484 |
if (*cp == 'X') |
| 485 |
xndx = cp; |
| 486 |
else if (*cp == 'Y') |
| 487 |
yndx = cp; |
| 488 |
if (xndx == NULL || yndx == NULL) |
| 489 |
return (-1); |
| 490 |
ord = 0; |
| 491 |
if (xndx > yndx) |
| 492 |
ord |= YMAJOR; |
| 493 |
if (xndx[-1] == '-') |
| 494 |
ord |= XDECR; |
| 495 |
if (yndx[-1] == '-') |
| 496 |
ord |= YDECR; |
| 497 |
if ((*xrp = atoi(xndx + 1)) <= 0) |
| 498 |
return (-1); |
| 499 |
if ((*yrp = atoi(yndx + 1)) <= 0) |
| 500 |
return (-1); |
| 501 |
return(ord); |
| 502 |
} |
| 503 |
|
| 504 |
|
| 505 |
fputresolu(ord, xres, yres, fp) /* put x and y resolution */ |
| 506 |
register int ord; |
| 507 |
int xres, yres; |
| 508 |
FILE *fp; |
| 509 |
{ |
| 510 |
if (ord & YMAJOR) |
| 511 |
fprintf(fp, "%cY %d %cX %d\n", ord & YDECR ? '-' : '+', yres, |
| 512 |
ord & XDECR ? '-' : '+', xres); |
| 513 |
else |
| 514 |
fprintf(fp, "%cX %d %cY %d\n", ord & XDECR ? '-' : '+', xres, |
| 515 |
ord & YDECR ? '-' : '+', yres); |
| 516 |
} |
| 517 |
|
| 518 |
|
| 519 |
fwritescan(scanline, len, fp) /* write out a scanline */ |
| 520 |
register COLOR *scanline; |
| 521 |
int len; |
| 522 |
register FILE *fp; |
| 523 |
{ |
| 524 |
int rept; |
| 525 |
COLR lastcolr, thiscolr; |
| 526 |
|
| 527 |
lastcolr[RED] = lastcolr[GRN] = lastcolr[BLU] = 1; |
| 528 |
lastcolr[EXP] = 0; |
| 529 |
rept = 0; |
| 530 |
while (len > 0) { |
| 531 |
setcolr(thiscolr, scanline[0][RED], |
| 532 |
scanline[0][GRN], |
| 533 |
scanline[0][BLU]); |
| 534 |
if (thiscolr[EXP] == lastcolr[EXP] && |
| 535 |
thiscolr[RED] == lastcolr[RED] && |
| 536 |
thiscolr[GRN] == lastcolr[GRN] && |
| 537 |
thiscolr[BLU] == lastcolr[BLU]) |
| 538 |
rept++; |
| 539 |
else { |
| 540 |
while (rept) { /* write out count */ |
| 541 |
putc(1, fp); |
| 542 |
putc(1, fp); |
| 543 |
putc(1, fp); |
| 544 |
putc(rept & 255, fp); |
| 545 |
rept >>= 8; |
| 546 |
} |
| 547 |
putc(thiscolr[RED], fp); /* new color */ |
| 548 |
putc(thiscolr[GRN], fp); |
| 549 |
putc(thiscolr[BLU], fp); |
| 550 |
putc(thiscolr[EXP], fp); |
| 551 |
copycolr(lastcolr, thiscolr); |
| 552 |
rept = 0; |
| 553 |
} |
| 554 |
scanline++; |
| 555 |
len--; |
| 556 |
} |
| 557 |
while (rept) { /* write out count */ |
| 558 |
putc(1, fp); |
| 559 |
putc(1, fp); |
| 560 |
putc(1, fp); |
| 561 |
putc(rept & 255, fp); |
| 562 |
rept >>= 8; |
| 563 |
} |
| 564 |
return (ferror(fp) ? -1 : 0); |
| 565 |
} |
| 566 |
|
| 567 |
static setcolr(clr, r, g, b) /* assign a short color value */ |
| 568 |
register COLR clr; |
| 569 |
double r, g, b; |
| 570 |
{ |
| 571 |
double d, frexp(); |
| 572 |
int e; |
| 573 |
|
| 574 |
d = r > g ? r : g; |
| 575 |
if (b > d) |
| 576 |
d = b; |
| 577 |
if (d <= 1e-32) { |
| 578 |
clr[RED] = clr[GRN] = clr[BLU] = 0; |
| 579 |
clr[EXP] = 0; |
| 580 |
return; |
| 581 |
} |
| 582 |
d = frexp(d, &e) * 256.0 / d; |
| 583 |
|
| 584 |
clr[RED] = (byte)(r * d); |
| 585 |
clr[GRN] = (byte)(g * d); |
| 586 |
clr[BLU] = (byte)(b * d); |
| 587 |
clr[EXP] = (byte)(e + COLXS); |
| 588 |
} |
| 589 |
|
| 590 |
/*** radiance_io.c ***/ |
