| 28 |
|
#define MINRUN 4 /* minimum run length */ |
| 29 |
|
|
| 30 |
|
|
| 31 |
< |
char * |
| 31 |
> |
int CNDX[4] = {0,1,2,3}; /* RGBE indices for SCOLOR, SCOLR */ |
| 32 |
> |
float WLPART[4] = {780,588,480,380}; /* RGB wavelength limits+partitions (nm) */ |
| 33 |
> |
|
| 34 |
> |
|
| 35 |
> |
int |
| 36 |
> |
setspectrsamp( /* assign spectral sampling, 1 if good, -1 if bad */ |
| 37 |
> |
int cn[4], /* input cn[3]=nsamps */ |
| 38 |
> |
float wlpt[4] /* input wlpt[0],wlpt[3]=extrema */ |
| 39 |
> |
) |
| 40 |
> |
{ |
| 41 |
> |
static const float PKWL[3] = {607, 553, 469}; |
| 42 |
> |
int i, j; |
| 43 |
> |
|
| 44 |
> |
if (cn[3] < 3) |
| 45 |
> |
return(-1); /* reject this */ |
| 46 |
> |
|
| 47 |
> |
if (wlpt[0] < wlpt[3]) { |
| 48 |
> |
float tf = wlpt[0]; |
| 49 |
> |
wlpt[0] = wlpt[3]; wlpt[3] = tf; |
| 50 |
> |
} |
| 51 |
> |
if (wlpt[0] - wlpt[3] < 50.f) |
| 52 |
> |
return(-1); /* also reject */ |
| 53 |
> |
|
| 54 |
> |
if (cn[3] > MAXCSAMP) |
| 55 |
> |
cn[3] = MAXCSAMP; |
| 56 |
> |
|
| 57 |
> |
if ((wlpt[3] >= PKWL[2]) | (wlpt[0] <= PKWL[0])) { |
| 58 |
> |
wlpt[1] = wlpt[0] + 0.333333f*(wlpt[3]-wlpt[0]); |
| 59 |
> |
wlpt[2] = wlpt[0] + 0.666667f*(wlpt[3]-wlpt[0]); |
| 60 |
> |
cn[0] = 0; cn[1] = cn[3]/3; cn[2] = cn[3]*2/3; |
| 61 |
> |
return(0); /* unhappy but non-fatal return value */ |
| 62 |
> |
} |
| 63 |
> |
wlpt[1] = 588.f; /* tuned for standard green channel */ |
| 64 |
> |
wlpt[2] = 480.f; |
| 65 |
> |
if (cn[3] == 3) { /* nothing to tune? */ |
| 66 |
> |
cn[0] = 0; cn[1] = 1; cn[2] = 2; |
| 67 |
> |
} else { /* else find nearest color indices */ |
| 68 |
> |
double curwl[3]; |
| 69 |
> |
memset(curwl, 0, sizeof(curwl)); |
| 70 |
> |
for (i = cn[3]; i--; ) { |
| 71 |
> |
const float cwl = (i+.5f)/cn[3]*(wlpt[3]-wlpt[0]) + wlpt[0]; |
| 72 |
> |
for (j = 3; j--; ) |
| 73 |
> |
if (fabs(cwl - PKWL[j]) < fabs(curwl[j] - PKWL[j])) { |
| 74 |
> |
curwl[j] = cwl; |
| 75 |
> |
cn[j] = i; |
| 76 |
> |
} |
| 77 |
> |
} |
| 78 |
> |
} |
| 79 |
> |
return(1); /* happy return value */ |
| 80 |
> |
} |
| 81 |
> |
|
| 82 |
> |
|
| 83 |
> |
void |
| 84 |
> |
setscolor( /* assign spectral color from RGB */ |
| 85 |
> |
SCOLOR scol, |
| 86 |
> |
double r, |
| 87 |
> |
double g, |
| 88 |
> |
double b |
| 89 |
> |
) |
| 90 |
> |
{ |
| 91 |
> |
const double step = (WLPART[3] - WLPART[0])/(double)NCSAMP; |
| 92 |
> |
double cwl = WLPART[0] + .5*step; |
| 93 |
> |
int i; |
| 94 |
> |
|
| 95 |
> |
for (i = 0; i < NCSAMP; i++) { |
| 96 |
> |
if (cwl >= WLPART[1]) |
| 97 |
> |
scol[i] = r; |
| 98 |
> |
else if (cwl >= WLPART[2]) |
| 99 |
> |
scol[i] = g; |
| 100 |
> |
else |
| 101 |
> |
scol[i] = b; |
| 102 |
> |
cwl += step; |
| 103 |
> |
} |
| 104 |
> |
} |
| 105 |
> |
|
| 106 |
> |
|
| 107 |
> |
void |
| 108 |
> |
scolor2color( /* assign RGB color from spectrum */ |
| 109 |
> |
COLOR col, |
| 110 |
> |
SCOLOR scol, /* uses average over bands */ |
| 111 |
> |
int ncs, |
| 112 |
> |
float wlpt[4] |
| 113 |
> |
) |
| 114 |
> |
{ |
| 115 |
> |
const double step = (wlpt[3] - wlpt[0])/(double)ncs; |
| 116 |
> |
double cwl = wlpt[0] + .5*step; |
| 117 |
> |
int i, j=0, n=0; |
| 118 |
> |
|
| 119 |
> |
setcolor(col, 0, 0, 0); |
| 120 |
> |
for (i = 0; i < ncs; i++) { |
| 121 |
> |
if (cwl < wlpt[j+1]) { |
| 122 |
> |
if (n > 1) col[j] /= (COLORV)n; |
| 123 |
> |
j++; |
| 124 |
> |
n = 0; |
| 125 |
> |
} |
| 126 |
> |
col[j] += scol[i]; |
| 127 |
> |
n++; |
| 128 |
> |
cwl += step; |
| 129 |
> |
} |
| 130 |
> |
if (n > 1) col[j] /= (COLORV)n; |
| 131 |
> |
} |
| 132 |
> |
|
| 133 |
> |
|
| 134 |
> |
void |
| 135 |
> |
scolor2colr( /* assign RGBE from spectral color */ |
| 136 |
> |
COLR clr, |
| 137 |
> |
SCOLOR scol, /* uses average over bands */ |
| 138 |
> |
int ncs, |
| 139 |
> |
float wlpt[4] |
| 140 |
> |
) |
| 141 |
> |
{ |
| 142 |
> |
COLOR col; |
| 143 |
> |
|
| 144 |
> |
scolor2color(col, scol, ncs, wlpt); |
| 145 |
> |
setcolr(clr, col[RED], col[GRN], col[BLU]); |
| 146 |
> |
} |
| 147 |
> |
|
| 148 |
> |
|
| 149 |
> |
void |
| 150 |
> |
scolor2scolr( /* float spectrum to common exponent */ |
| 151 |
> |
SCOLR sclr, |
| 152 |
> |
SCOLOR scol, |
| 153 |
> |
int ncs |
| 154 |
> |
) |
| 155 |
> |
{ |
| 156 |
> |
int i = ncs; |
| 157 |
> |
COLORV p = scol[--i]; |
| 158 |
> |
|
| 159 |
> |
while (i) |
| 160 |
> |
if (scol[--i] > p) |
| 161 |
> |
p = scol[i]; |
| 162 |
> |
if (p <= 1e-32) { |
| 163 |
> |
memset(sclr, 0, ncs+1); |
| 164 |
> |
return; |
| 165 |
> |
} |
| 166 |
> |
p = frexp(p, &i) * 256.0 / p; |
| 167 |
> |
sclr[ncs] = i + COLXS; |
| 168 |
> |
for (i = ncs; i--; ) |
| 169 |
> |
sclr[i] = (scol[i] > 0) * (int)(scol[i]*p); |
| 170 |
> |
} |
| 171 |
> |
|
| 172 |
> |
|
| 173 |
> |
void |
| 174 |
> |
scolr2scolor( /* common exponent to float spectrum */ |
| 175 |
> |
SCOLOR scol, |
| 176 |
> |
SCOLR sclr, |
| 177 |
> |
int ncs |
| 178 |
> |
) |
| 179 |
> |
{ |
| 180 |
> |
double f; |
| 181 |
> |
int i; |
| 182 |
> |
|
| 183 |
> |
if (sclr[ncs] == 0) { |
| 184 |
> |
memset(scol, 0, sizeof(COLORV)*ncs); |
| 185 |
> |
return; |
| 186 |
> |
} |
| 187 |
> |
f = ldexp(1.0, (int)sclr[ncs]-(COLXS+8)); |
| 188 |
> |
|
| 189 |
> |
for (i = ncs; i--; ) |
| 190 |
> |
scol[i] = (sclr[i] + 0.5)*f; |
| 191 |
> |
} |
| 192 |
> |
|
| 193 |
> |
|
| 194 |
> |
double |
| 195 |
> |
scolor_mean( /* compute average for spectral color */ |
| 196 |
> |
SCOLOR scol |
| 197 |
> |
) |
| 198 |
> |
{ |
| 199 |
> |
int i = NCSAMP; |
| 200 |
> |
double sum = 0; |
| 201 |
> |
|
| 202 |
> |
while (i--) |
| 203 |
> |
sum += scol[i]; |
| 204 |
> |
|
| 205 |
> |
return sum/(double)NCSAMP; |
| 206 |
> |
} |
| 207 |
> |
|
| 208 |
> |
|
| 209 |
> |
double |
| 210 |
> |
sintens( /* find maximum value from spectrum */ |
| 211 |
> |
SCOLOR scol |
| 212 |
> |
) |
| 213 |
> |
{ |
| 214 |
> |
int i = NCSAMP; |
| 215 |
> |
COLORV peak = scol[--i]; |
| 216 |
> |
|
| 217 |
> |
while (i) |
| 218 |
> |
if (scol[--i] > peak) |
| 219 |
> |
peak = scol[i]; |
| 220 |
> |
|
| 221 |
> |
return peak; |
| 222 |
> |
} |
| 223 |
> |
|
| 224 |
> |
|
| 225 |
> |
void |
| 226 |
> |
convertscolor( /* spectrum conversion, zero-fill ends */ |
| 227 |
> |
SCOLOR dst, /* destination spectrum */ |
| 228 |
> |
int dnc, /* destination # of spectral samples/intervals */ |
| 229 |
> |
double dwl0, /* starting destination wavelength (longer) */ |
| 230 |
> |
double dwl1, /* ending destination wavelength (shorter) */ |
| 231 |
> |
const COLORV src[], /* source spectrum array */ |
| 232 |
> |
int snc, |
| 233 |
> |
double swl0, /* long/short wavelengths may be reversed */ |
| 234 |
> |
double swl1 |
| 235 |
> |
) |
| 236 |
> |
{ |
| 237 |
> |
const int sdir = 1 - 2*(swl0 < swl1); |
| 238 |
> |
const double sstp = (swl1 - swl0)/(double)snc; |
| 239 |
> |
const double dstp = (dwl1 - dwl0)/(double)dnc; |
| 240 |
> |
const double rdstp = 1./dstp; |
| 241 |
> |
int si, ssi, di; |
| 242 |
> |
double wl; |
| 243 |
> |
|
| 244 |
> |
if ((dnc < 3) | (dwl0 <= dwl1) | (dst == src)) |
| 245 |
> |
return; /* invalid destination */ |
| 246 |
> |
|
| 247 |
> |
if (dnc == snc && (dwl0-swl0)*(dwl0-swl0) + (dwl1-swl1)*(dwl1-swl1) <= .5) { |
| 248 |
> |
memcpy(dst, src, sizeof(COLORV)*dnc); |
| 249 |
> |
return; /* same spectral sampling */ |
| 250 |
> |
} |
| 251 |
> |
memset(dst, 0, sizeof(COLORV)*dnc); |
| 252 |
> |
/* set starting positions */ |
| 253 |
> |
if ((sdir>0 ? swl0 : swl1) <= dwl0) { |
| 254 |
> |
if (sdir > 0) { |
| 255 |
> |
wl = swl0; |
| 256 |
> |
ssi = 0; |
| 257 |
> |
} else { |
| 258 |
> |
wl = swl1; |
| 259 |
> |
ssi = snc-1; |
| 260 |
> |
} |
| 261 |
> |
si = 0; |
| 262 |
> |
di = (wl - dwl0)*rdstp; |
| 263 |
> |
} else { |
| 264 |
> |
wl = dwl0; |
| 265 |
> |
si = (wl - swl0)/sstp; |
| 266 |
> |
ssi = sdir > 0 ? si : snc-1 - si; |
| 267 |
> |
di = 0; |
| 268 |
> |
} |
| 269 |
> |
swl0 += (sdir < 0)*sstp; |
| 270 |
> |
/* step through intervals */ |
| 271 |
> |
while ((si < snc) & (di < dnc)) { |
| 272 |
> |
double intvl; |
| 273 |
> |
if (swl0 + (ssi+sdir)*sstp < dwl0 + (di+1)*dstp) { |
| 274 |
> |
intvl = dwl0 + (di+1)*dstp - wl; |
| 275 |
> |
dst[di++] += src[ssi]*intvl*rdstp; |
| 276 |
> |
} else { |
| 277 |
> |
intvl = swl0 + (ssi+sdir)*sstp - wl; |
| 278 |
> |
dst[di] += src[ssi]*intvl*rdstp; |
| 279 |
> |
ssi += sdir; |
| 280 |
> |
si++; |
| 281 |
> |
} |
| 282 |
> |
wl += intvl; |
| 283 |
> |
} |
| 284 |
> |
} |
| 285 |
> |
|
| 286 |
> |
|
| 287 |
> |
void * |
| 288 |
|
tempbuffer( /* get a temporary buffer */ |
| 289 |
< |
unsigned int len |
| 289 |
> |
size_t len |
| 290 |
|
) |
| 291 |
|
{ |
| 292 |
< |
static char *tempbuf = NULL; |
| 293 |
< |
static unsigned tempbuflen = 0; |
| 292 |
> |
static void *tempbuf = NULL; |
| 293 |
> |
static size_t tempbuflen = 0; |
| 294 |
|
|
| 295 |
< |
if (!len | (len > tempbuflen)) { |
| 296 |
< |
if (tempbuflen) |
| 295 |
> |
if (!len) { /* call to free */ |
| 296 |
> |
if (tempbuflen) { |
| 297 |
|
free(tempbuf); |
| 298 |
< |
tempbuf = len ? (char *)malloc(len) : (char *)NULL; |
| 299 |
< |
tempbuflen = len*(tempbuf != NULL); |
| 298 |
> |
tempbuf = NULL; |
| 299 |
> |
tempbuflen = 0; |
| 300 |
> |
} |
| 301 |
> |
return(NULL); |
| 302 |
|
} |
| 303 |
+ |
if (len <= tempbuflen) /* big enough already? */ |
| 304 |
+ |
return(tempbuf); |
| 305 |
+ |
/* else free & reallocate */ |
| 306 |
+ |
if (tempbuflen) |
| 307 |
+ |
free(tempbuf); |
| 308 |
+ |
tempbuf = malloc(len); |
| 309 |
+ |
tempbuflen = len*(tempbuf != NULL); |
| 310 |
|
return(tempbuf); |
| 311 |
|
} |
| 312 |
|
|
| 364 |
|
return(ferror(fp) ? -1 : 0); |
| 365 |
|
} |
| 366 |
|
|
| 367 |
< |
|
| 367 |
> |
/* |
| 368 |
> |
* An old-format scanline is either a stream of valid RGBE or XYZE real |
| 369 |
> |
* pixels or at least one real pixel followed by some number of |
| 370 |
> |
* invalid real pixels of the form (1,1,1,n), where n is a count. |
| 371 |
> |
* These can themselves be repeated to create a multibyte repeat |
| 372 |
> |
* count, with the least significant byte first (little-endian order.) |
| 373 |
> |
* Repeat counts are limited by the size of an int; if a repetition |
| 374 |
> |
* leads to an overrun, the rest of the the repetition will be |
| 375 |
> |
* silently ignored. |
| 376 |
> |
*/ |
| 377 |
|
static int |
| 378 |
|
oldreadcolrs( /* read in an old-style colr scanline */ |
| 379 |
|
COLR *scanline, |
| 411 |
|
return(0); |
| 412 |
|
} |
| 413 |
|
|
| 414 |
< |
|
| 414 |
> |
/* |
| 415 |
> |
* There are two scanline formats: old and new. The old format |
| 416 |
> |
* compresses runs of RGBE or XYZE four-byte real pixels; the new |
| 417 |
> |
* format breaks the pixels into R, G, B, and E lines (or XYZE lines) |
| 418 |
> |
* which are individually run-length encoded. |
| 419 |
> |
* |
| 420 |
> |
* An old-format scanline always begins with a valid real pixel; at |
| 421 |
> |
* least one of the RGB (or XYZ) values will have its high-order bit |
| 422 |
> |
* set. A new-format scanline begins with four bytes which are not a |
| 423 |
> |
* valid real pixel: (2, 2, lenhigh, lenlow) where lenhigh is always |
| 424 |
> |
* less than 128 and hence never has a high-order bit set. |
| 425 |
> |
* |
| 426 |
> |
* A new-format scanline is broken into its RGBE or XYZE components. |
| 427 |
> |
* Each is output and run-length encoded separately so that a scanline |
| 428 |
> |
* is broken into four records. In turn, each record is organized |
| 429 |
> |
* into chunks of up to 128 characters, which begin with a count byte. |
| 430 |
> |
* If the count byte is greater than 128, the following data byte is |
| 431 |
> |
* repeated (count-128) times. If not, the count byte is followed by |
| 432 |
> |
* that many data bytes. |
| 433 |
> |
*/ |
| 434 |
|
int |
| 435 |
|
freadcolrs( /* read in an encoded colr scanline */ |
| 436 |
|
COLR *scanline, |
| 441 |
|
int i, j; |
| 442 |
|
int code, val; |
| 443 |
|
/* determine scanline type */ |
| 444 |
< |
if ((len < MINELEN) | (len > MAXELEN)) |
| 445 |
< |
return(oldreadcolrs(scanline, len, fp)); |
| 444 |
> |
if (len <= 0) |
| 445 |
> |
return(0); |
| 446 |
|
if ((i = getc(fp)) == EOF) |
| 447 |
|
return(-1); |
| 448 |
< |
if (i != 2) { |
| 156 |
< |
ungetc(i, fp); |
| 157 |
< |
return(oldreadcolrs(scanline, len, fp)); |
| 158 |
< |
} |
| 448 |
> |
scanline[0][RED] = i; |
| 449 |
|
scanline[0][GRN] = getc(fp); |
| 450 |
|
scanline[0][BLU] = getc(fp); |
| 451 |
|
if ((i = getc(fp)) == EOF) |
| 452 |
|
return(-1); |
| 453 |
< |
if ((scanline[0][GRN] != 2) | ((scanline[0][BLU] & 0x80) != 0)) { |
| 454 |
< |
scanline[0][RED] = 2; |
| 453 |
> |
if ((scanline[0][RED] != 2) | (scanline[0][GRN] != 2) | |
| 454 |
> |
(scanline[0][BLU] & 0x80)) { |
| 455 |
|
scanline[0][EXP] = i; |
| 456 |
|
return(oldreadcolrs(scanline+1, len-1, fp)); |
| 457 |
|
} |
| 562 |
|
|
| 563 |
|
d = frexp(d, &e) * 256.0 / d; |
| 564 |
|
|
| 565 |
< |
if (r > 0.0) |
| 566 |
< |
clr[RED] = r * d; |
| 567 |
< |
else |
| 278 |
< |
clr[RED] = 0; |
| 279 |
< |
if (g > 0.0) |
| 280 |
< |
clr[GRN] = g * d; |
| 281 |
< |
else |
| 282 |
< |
clr[GRN] = 0; |
| 283 |
< |
if (b > 0.0) |
| 284 |
< |
clr[BLU] = b * d; |
| 285 |
< |
else |
| 286 |
< |
clr[BLU] = 0; |
| 287 |
< |
|
| 565 |
> |
clr[RED] = (r > 0) * (int)(r*d); |
| 566 |
> |
clr[GRN] = (g > 0) * (int)(g*d); |
| 567 |
> |
clr[BLU] = (b > 0) * (int)(b*d); |
| 568 |
|
clr[EXP] = e + COLXS; |
| 569 |
|
} |
| 570 |
|
|
| 577 |
|
{ |
| 578 |
|
double f; |
| 579 |
|
|
| 580 |
< |
if (clr[EXP] == 0) |
| 580 |
> |
if (clr[EXP] == 0) { |
| 581 |
|
col[RED] = col[GRN] = col[BLU] = 0.0; |
| 582 |
< |
else { |
| 303 |
< |
f = ldexp(1.0, (int)clr[EXP]-(COLXS+8)); |
| 304 |
< |
col[RED] = (clr[RED] + 0.5)*f; |
| 305 |
< |
col[GRN] = (clr[GRN] + 0.5)*f; |
| 306 |
< |
col[BLU] = (clr[BLU] + 0.5)*f; |
| 582 |
> |
return; |
| 583 |
|
} |
| 584 |
+ |
f = ldexp(1.0, (int)clr[EXP]-(COLXS+8)); |
| 585 |
+ |
col[RED] = (clr[RED] + 0.5)*f; |
| 586 |
+ |
col[GRN] = (clr[GRN] + 0.5)*f; |
| 587 |
+ |
col[BLU] = (clr[BLU] + 0.5)*f; |
| 588 |
|
} |
| 589 |
|
|
| 590 |
|
|
| 598 |
|
int i; |
| 599 |
|
|
| 600 |
|
for (i = 0; i < 3; i++) |
| 601 |
< |
if (colval(c1,i)-colval(c2,i) > md*colval(c2,i) || |
| 602 |
< |
colval(c2,i)-colval(c1,i) > md*colval(c1,i)) |
| 601 |
> |
if ((colval(c1,i)-colval(c2,i) > md*colval(c2,i)) | |
| 602 |
> |
(colval(c2,i)-colval(c1,i) > md*colval(c1,i))) |
| 603 |
> |
return(1); |
| 604 |
> |
return(0); |
| 605 |
> |
} |
| 606 |
> |
|
| 607 |
> |
|
| 608 |
> |
int |
| 609 |
> |
sbigsdiff( /* sc1 delta sc2 > md? */ |
| 610 |
> |
SCOLOR c1, |
| 611 |
> |
SCOLOR c2, |
| 612 |
> |
double md |
| 613 |
> |
) |
| 614 |
> |
{ |
| 615 |
> |
int i = NCSAMP; |
| 616 |
> |
|
| 617 |
> |
while (i--) |
| 618 |
> |
if ((c1[i]-c2[i] > md*c2[i]) | (c2[i]-c1[i] > md*c1[i])) |
| 619 |
|
return(1); |
| 620 |
|
return(0); |
| 621 |
|
} |
