10 |
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#include "copyright.h" |
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|
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#include <stdio.h> |
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|
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#include <stdlib.h> |
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|
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#include <math.h> |
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|
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#include "color.h" |
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|
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+ |
#ifdef getc_unlocked /* avoid horrendous overhead of flockfile */ |
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#undef getc |
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+ |
#undef putc |
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+ |
#undef ferror |
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+ |
#define getc getc_unlocked |
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#define putc putc_unlocked |
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+ |
#define ferror ferror_unlocked |
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+ |
#endif |
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+ |
|
26 |
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#define MINELEN 8 /* minimum scanline length for encoding */ |
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#define MAXELEN 0x7fff /* maximum scanline length for encoding */ |
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#define MINRUN 4 /* minimum run length */ |
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|
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|
31 |
< |
char * |
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tempbuffer(len) /* get a temporary buffer */ |
33 |
< |
unsigned int len; |
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> |
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) */ |
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> |
|
34 |
> |
|
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> |
int |
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> |
setspectrsamp( /* assign spectral sampling, 1 if good, -1 if bad */ |
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> |
int cn[4], /* input cn[3]=nsamps */ |
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> |
float wlpt[4] /* input wlpt[0],wlpt[3]=extrema */ |
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) |
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{ |
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static char *tempbuf = NULL; |
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static unsigned tempbuflen = 0; |
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> |
static const float PKWL[3] = {607, 553, 469}; |
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> |
int i, j; |
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|
44 |
< |
if (len > tempbuflen) { |
45 |
< |
if (tempbuflen > 0) |
46 |
< |
tempbuf = (char *)realloc(tempbuf, len); |
44 |
> |
if (cn[3] < 3) |
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> |
return(-1); /* reject this */ |
46 |
> |
|
47 |
> |
if (wlpt[0] < wlpt[3]) { |
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> |
float tf = wlpt[0]; |
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> |
wlpt[0] = wlpt[3]; wlpt[3] = tf; |
50 |
> |
} |
51 |
> |
if (wlpt[0] - wlpt[3] < 50.f) |
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> |
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]); |
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> |
cn[0] = 0; cn[1] = cn[3]/3; cn[2] = cn[3]*2/3; |
61 |
> |
return(0); /* unhappy but non-fatal return value */ |
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> |
} |
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> |
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]; |
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> |
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]; |
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> |
for (j = 3; j--; ) |
73 |
> |
if (fabs(cwl - PKWL[j]) < fabs(curwl[j] - PKWL[j])) { |
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> |
curwl[j] = cwl; |
75 |
> |
cn[j] = i; |
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> |
} |
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> |
} |
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> |
} |
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return(1); /* happy return value */ |
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> |
} |
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|
82 |
> |
|
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void |
84 |
> |
setscolor( /* assign spectral color from RGB */ |
85 |
> |
SCOLOR scol, |
86 |
> |
double r, |
87 |
> |
double g, |
88 |
> |
double b |
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> |
) |
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]) |
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> |
scol[i] = r; |
98 |
> |
else if (cwl >= WLPART[2]) |
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scol[i] = g; |
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|
else |
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< |
tempbuf = (char *)malloc(len); |
102 |
< |
tempbuflen = tempbuf==NULL ? 0 : len; |
101 |
> |
scol[i] = b; |
102 |
> |
cwl += step; |
103 |
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} |
104 |
+ |
} |
105 |
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|
106 |
+ |
|
107 |
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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]); |
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+ |
} |
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 - (sdir>0 ? swl0 : swl1))/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 |
+ |
size_t len |
290 |
+ |
) |
291 |
+ |
{ |
292 |
+ |
static void *tempbuf = NULL; |
293 |
+ |
static size_t tempbuflen = 0; |
294 |
+ |
|
295 |
+ |
if (!len) { /* call to free */ |
296 |
+ |
if (tempbuflen) { |
297 |
+ |
free(tempbuf); |
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 |
|
|
313 |
|
|
314 |
|
int |
315 |
< |
fwritecolrs(scanline, len, fp) /* write out a colr scanline */ |
316 |
< |
register COLR *scanline; |
317 |
< |
int len; |
318 |
< |
register FILE *fp; |
315 |
> |
fwritecolrs( /* write out a colr scanline */ |
316 |
> |
COLR *scanline, |
317 |
> |
int len, |
318 |
> |
FILE *fp |
319 |
> |
) |
320 |
|
{ |
321 |
< |
register int i, j, beg, cnt = 1; |
321 |
> |
int i, j, beg, cnt = 1; |
322 |
|
int c2; |
323 |
|
|
324 |
< |
if (len < MINELEN | len > MAXELEN) /* OOBs, write out flat */ |
324 |
> |
if ((len < MINELEN) | (len > MAXELEN)) /* OOBs, write out flat */ |
325 |
|
return(fwrite((char *)scanline,sizeof(COLR),len,fp) - len); |
326 |
|
/* put magic header */ |
327 |
|
putc(2, fp); |
328 |
|
putc(2, fp); |
329 |
|
putc(len>>8, fp); |
330 |
< |
putc(len&255, fp); |
330 |
> |
putc(len&0xff, fp); |
331 |
|
/* put components seperately */ |
332 |
|
for (i = 0; i < 4; i++) { |
333 |
|
for (j = 0; j < len; j += cnt) { /* find next run */ |
334 |
|
for (beg = j; beg < len; beg += cnt) { |
335 |
< |
for (cnt = 1; cnt < 127 && beg+cnt < len && |
335 |
> |
for (cnt = 1; (cnt < 127) & (beg+cnt < len) && |
336 |
|
scanline[beg+cnt][i] == scanline[beg][i]; cnt++) |
337 |
|
; |
338 |
|
if (cnt >= MINRUN) |
339 |
|
break; /* long enough */ |
340 |
|
} |
341 |
< |
if (beg-j > 1 && beg-j < MINRUN) { |
341 |
> |
if ((beg-j > 1) & (beg-j < MINRUN)) { |
342 |
|
c2 = j+1; |
343 |
|
while (scanline[c2++][i] == scanline[j][i]) |
344 |
|
if (c2 == beg) { /* short run */ |
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(scanline, len, fp) /* read in an old colr scanline */ |
379 |
< |
register COLR *scanline; |
380 |
< |
int len; |
381 |
< |
register FILE *fp; |
378 |
> |
oldreadcolrs( /* read in an old-style colr scanline */ |
379 |
> |
COLR *scanline, |
380 |
> |
int len, |
381 |
> |
FILE *fp |
382 |
> |
) |
383 |
|
{ |
384 |
< |
int rshift; |
385 |
< |
register int i; |
384 |
> |
int rshift = 0; |
385 |
> |
int i; |
386 |
|
|
105 |
– |
rshift = 0; |
106 |
– |
|
387 |
|
while (len > 0) { |
388 |
|
scanline[0][RED] = getc(fp); |
389 |
|
scanline[0][GRN] = getc(fp); |
390 |
|
scanline[0][BLU] = getc(fp); |
391 |
< |
scanline[0][EXP] = getc(fp); |
392 |
< |
if (feof(fp) || ferror(fp)) |
391 |
> |
scanline[0][EXP] = i = getc(fp); |
392 |
> |
if (i == EOF) |
393 |
|
return(-1); |
394 |
< |
if (scanline[0][RED] == 1 && |
395 |
< |
scanline[0][GRN] == 1 && |
396 |
< |
scanline[0][BLU] == 1) { |
397 |
< |
for (i = scanline[0][EXP] << rshift; i > 0; i--) { |
394 |
> |
if (scanline[0][GRN] == 1 && |
395 |
> |
(scanline[0][RED] == 1) & |
396 |
> |
(scanline[0][BLU] == 1)) { |
397 |
> |
i = scanline[0][EXP] << rshift; |
398 |
> |
while (i--) { |
399 |
|
copycolr(scanline[0], scanline[-1]); |
400 |
+ |
if (--len <= 0) |
401 |
+ |
return(0); |
402 |
|
scanline++; |
120 |
– |
len--; |
403 |
|
} |
404 |
|
rshift += 8; |
405 |
|
} else { |
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(scanline, len, fp) /* read in an encoded colr scanline */ |
436 |
< |
register COLR *scanline; |
437 |
< |
int len; |
438 |
< |
register FILE *fp; |
435 |
> |
freadcolrs( /* read in an encoded colr scanline */ |
436 |
> |
COLR *scanline, |
437 |
> |
int len, |
438 |
> |
FILE *fp |
439 |
> |
) |
440 |
|
{ |
441 |
< |
register int i, j; |
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) { |
147 |
< |
ungetc(i, fp); |
148 |
< |
return(oldreadcolrs(scanline, len, fp)); |
149 |
< |
} |
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] & 128) { |
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 |
|
} |
466 |
|
code &= 127; |
467 |
|
if ((val = getc(fp)) == EOF) |
468 |
|
return -1; |
469 |
+ |
if (j + code > len) |
470 |
+ |
return -1; /* overrun */ |
471 |
|
while (code--) |
472 |
|
scanline[j++][i] = val; |
473 |
< |
} else /* non-run */ |
473 |
> |
} else { /* non-run */ |
474 |
> |
if (j + code > len) |
475 |
> |
return -1; /* overrun */ |
476 |
|
while (code--) { |
477 |
|
if ((val = getc(fp)) == EOF) |
478 |
|
return -1; |
479 |
|
scanline[j++][i] = val; |
480 |
|
} |
481 |
+ |
} |
482 |
|
} |
483 |
|
return(0); |
484 |
|
} |
485 |
|
|
486 |
|
|
487 |
|
int |
488 |
< |
fwritescan(scanline, len, fp) /* write out a scanline */ |
489 |
< |
register COLOR *scanline; |
490 |
< |
int len; |
491 |
< |
FILE *fp; |
488 |
> |
fwritescan( /* write out a scanline */ |
489 |
> |
COLOR *scanline, |
490 |
> |
int len, |
491 |
> |
FILE *fp |
492 |
> |
) |
493 |
|
{ |
494 |
|
COLR *clrscan; |
495 |
|
int n; |
496 |
< |
register COLR *sp; |
496 |
> |
COLR *sp; |
497 |
|
/* get scanline buffer */ |
498 |
|
if ((sp = (COLR *)tempbuffer(len*sizeof(COLR))) == NULL) |
499 |
|
return(-1); |
512 |
|
|
513 |
|
|
514 |
|
int |
515 |
< |
freadscan(scanline, len, fp) /* read in a scanline */ |
516 |
< |
register COLOR *scanline; |
517 |
< |
int len; |
518 |
< |
FILE *fp; |
515 |
> |
freadscan( /* read in a scanline */ |
516 |
> |
COLOR *scanline, |
517 |
> |
int len, |
518 |
> |
FILE *fp |
519 |
> |
) |
520 |
|
{ |
521 |
< |
register COLR *clrscan; |
521 |
> |
COLR *clrscan; |
522 |
|
|
523 |
|
if ((clrscan = (COLR *)tempbuffer(len*sizeof(COLR))) == NULL) |
524 |
|
return(-1); |
528 |
|
colr_color(scanline[0], clrscan[0]); |
529 |
|
while (--len > 0) { |
530 |
|
scanline++; clrscan++; |
531 |
< |
if (clrscan[0][RED] == clrscan[-1][RED] && |
532 |
< |
clrscan[0][GRN] == clrscan[-1][GRN] && |
533 |
< |
clrscan[0][BLU] == clrscan[-1][BLU] && |
534 |
< |
clrscan[0][EXP] == clrscan[-1][EXP]) |
531 |
> |
if (clrscan[0][GRN] == clrscan[-1][GRN] && |
532 |
> |
(clrscan[0][RED] == clrscan[-1][RED]) & |
533 |
> |
(clrscan[0][BLU] == clrscan[-1][BLU]) & |
534 |
> |
(clrscan[0][EXP] == clrscan[-1][EXP])) |
535 |
|
copycolor(scanline[0], scanline[-1]); |
536 |
|
else |
537 |
|
colr_color(scanline[0], clrscan[0]); |
541 |
|
|
542 |
|
|
543 |
|
void |
544 |
< |
setcolr(clr, r, g, b) /* assign a short color value */ |
545 |
< |
register COLR clr; |
546 |
< |
double r, g, b; |
544 |
> |
setcolr( /* assign a short color value */ |
545 |
> |
COLR clr, |
546 |
> |
double r, |
547 |
> |
double g, |
548 |
> |
double b |
549 |
> |
) |
550 |
|
{ |
551 |
|
double d; |
552 |
|
int e; |
560 |
|
return; |
561 |
|
} |
562 |
|
|
563 |
< |
d = frexp(d, &e) * 255.9999 / d; |
563 |
> |
d = frexp(d, &e) * 256.0 / d; |
564 |
|
|
565 |
< |
if (r > 0.0) |
566 |
< |
clr[RED] = r * d; |
567 |
< |
else |
259 |
< |
clr[RED] = 0; |
260 |
< |
if (g > 0.0) |
261 |
< |
clr[GRN] = g * d; |
262 |
< |
else |
263 |
< |
clr[GRN] = 0; |
264 |
< |
if (b > 0.0) |
265 |
< |
clr[BLU] = b * d; |
266 |
< |
else |
267 |
< |
clr[BLU] = 0; |
268 |
< |
|
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 |
|
|
571 |
|
|
572 |
|
void |
573 |
< |
colr_color(col, clr) /* convert short to float color */ |
574 |
< |
register COLOR col; |
575 |
< |
register COLR clr; |
573 |
> |
colr_color( /* convert short to float color */ |
574 |
> |
COLOR col, |
575 |
> |
COLR clr |
576 |
> |
) |
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 { |
283 |
< |
f = ldexp(1.0, (int)clr[EXP]-(COLXS+8)); |
284 |
< |
col[RED] = (clr[RED] + 0.5)*f; |
285 |
< |
col[GRN] = (clr[GRN] + 0.5)*f; |
286 |
< |
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 |
|
|
591 |
|
int |
592 |
< |
bigdiff(c1, c2, md) /* c1 delta c2 > md? */ |
593 |
< |
register COLOR c1, c2; |
594 |
< |
double md; |
592 |
> |
bigdiff( /* c1 delta c2 > md? */ |
593 |
> |
COLOR c1, |
594 |
> |
COLOR c2, |
595 |
> |
double md |
596 |
> |
) |
597 |
|
{ |
598 |
< |
register int i; |
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 |
|
} |