1 |
#ifndef lint |
2 |
static const char RCSid[] = "$Id: ximage.c,v 2.12 2003/06/30 14:59:12 schorsch Exp $"; |
3 |
#endif |
4 |
/* |
5 |
* ximage.c - driver for X-windows |
6 |
* |
7 |
* 4/30/87 |
8 |
* 3/3/88 Added calls to xraster & Paul Heckbert's ciq routines |
9 |
*/ |
10 |
|
11 |
#include "standard.h" |
12 |
|
13 |
#include <X/Xlib.h> |
14 |
#include <X/cursors/bcross.cursor> |
15 |
#include <X/cursors/bcross_mask.cursor> |
16 |
|
17 |
#include <sys/types.h> |
18 |
#include <string.h> |
19 |
#include <ctype.h> |
20 |
#include <time.h> |
21 |
|
22 |
#include "color.h" |
23 |
#include "resolu.h" |
24 |
#include "xraster.h" |
25 |
#include "view.h" |
26 |
#include "pic.h" |
27 |
#include "random.h" |
28 |
|
29 |
#define controlshift(e) (((XButtonEvent *)(e))->detail & (ShiftMask|ControlMask)) |
30 |
|
31 |
#define FONTNAME "9x15" /* text font we'll use */ |
32 |
|
33 |
#define CTRL(c) ((c)-'@') |
34 |
|
35 |
#define BORWIDTH 5 /* border width */ |
36 |
#define BARHEIGHT 25 /* menu bar size */ |
37 |
|
38 |
double gamcor = 2.2; /* gamma correction */ |
39 |
|
40 |
XRASTER *ourras = NULL; /* our stored raster image */ |
41 |
|
42 |
int dither = 1; /* dither colors? */ |
43 |
int fast = 0; /* keep picture in Pixmap? */ |
44 |
|
45 |
Window wind = 0; /* our output window */ |
46 |
Font fontid; /* our font */ |
47 |
|
48 |
int maxcolors = 0; /* maximum colors */ |
49 |
int greyscale = 0; /* in grey */ |
50 |
|
51 |
int scale = 0; /* scalefactor; power of two */ |
52 |
|
53 |
int xoff = 0; /* x image offset */ |
54 |
int yoff = 0; /* y image offset */ |
55 |
|
56 |
VIEW ourview = STDVIEW; /* image view parameters */ |
57 |
int gotview = 0; /* got parameters from file */ |
58 |
|
59 |
COLR *scanline; /* scan line buffer */ |
60 |
|
61 |
int xmax, ymax; /* picture resolution */ |
62 |
int width, height; /* window size */ |
63 |
char *fname = NULL; /* input file name */ |
64 |
FILE *fin = stdin; /* input file */ |
65 |
long *scanpos = NULL; /* scan line positions in file */ |
66 |
int cury = 0; /* current scan location */ |
67 |
|
68 |
double exposure = 1.0; /* exposure compensation used */ |
69 |
|
70 |
int wrongformat = 0; /* input in another format */ |
71 |
|
72 |
struct { |
73 |
int xmin, ymin, xsiz, ysiz; |
74 |
} box = {0, 0, 0, 0}; /* current box */ |
75 |
|
76 |
char *geometry = NULL; /* geometry specification */ |
77 |
|
78 |
char *progname; |
79 |
|
80 |
char errmsg[128]; |
81 |
|
82 |
static gethfunc headline; |
83 |
|
84 |
|
85 |
main(argc, argv) |
86 |
int argc; |
87 |
char *argv[]; |
88 |
{ |
89 |
extern char *getenv(); |
90 |
char *gv; |
91 |
int i; |
92 |
|
93 |
progname = argv[0]; |
94 |
if ((gv = getenv("DISPLAY_GAMMA")) != NULL) |
95 |
gamcor = atof(gv); |
96 |
|
97 |
for (i = 1; i < argc; i++) |
98 |
if (argv[i][0] == '-') |
99 |
switch (argv[i][1]) { |
100 |
case 'c': |
101 |
maxcolors = atoi(argv[++i]); |
102 |
break; |
103 |
case 'b': |
104 |
greyscale = !greyscale; |
105 |
break; |
106 |
case 'm': |
107 |
maxcolors = 2; |
108 |
break; |
109 |
case 'd': |
110 |
dither = !dither; |
111 |
break; |
112 |
case 'f': |
113 |
fast = !fast; |
114 |
break; |
115 |
case 'e': |
116 |
if (argv[i+1][0] != '+' && argv[i+1][0] != '-') |
117 |
goto userr; |
118 |
scale = atoi(argv[++i]); |
119 |
break; |
120 |
case 'g': |
121 |
gamcor = atof(argv[++i]); |
122 |
break; |
123 |
default: |
124 |
goto userr; |
125 |
} |
126 |
else if (argv[i][0] == '=') |
127 |
geometry = argv[i]; |
128 |
else |
129 |
break; |
130 |
|
131 |
if (argc-i == 1) { |
132 |
fname = argv[i]; |
133 |
fin = fopen(fname, "r"); |
134 |
if (fin == NULL) { |
135 |
sprintf(errmsg, "can't open file \"%s\"", fname); |
136 |
quiterr(errmsg); |
137 |
} |
138 |
} |
139 |
/* get header */ |
140 |
getheader(fin, headline, NULL); |
141 |
/* get picture dimensions */ |
142 |
if (wrongformat || fgetresolu(&xmax, &ymax, fin) != (YMAJOR|YDECR)) |
143 |
quiterr("bad picture size"); |
144 |
/* set view parameters */ |
145 |
if (gotview && setview(&ourview) != NULL) |
146 |
gotview = 0; |
147 |
if ((scanline = (COLR *)malloc(xmax*sizeof(COLR))) == NULL) |
148 |
quiterr("out of memory"); |
149 |
|
150 |
init(); /* get file and open window */ |
151 |
|
152 |
for ( ; ; ) |
153 |
getevent(); /* main loop */ |
154 |
userr: |
155 |
fprintf(stderr, |
156 |
"Usage: %s [=geometry][-b][-m][-d][-f][-c ncolors][-e +/-stops] file\n", |
157 |
progname); |
158 |
quit(1); |
159 |
} |
160 |
|
161 |
|
162 |
static int |
163 |
headline( /* get relevant info from header */ |
164 |
char *s, |
165 |
void *p |
166 |
) |
167 |
{ |
168 |
char fmt[32]; |
169 |
|
170 |
if (isexpos(s)) |
171 |
exposure *= exposval(s); |
172 |
else if (isformat(s)) { |
173 |
formatval(fmt, s); |
174 |
wrongformat = strcmp(fmt, COLRFMT); |
175 |
} else if (isview(s) && sscanview(&ourview, s) > 0) |
176 |
gotview++; |
177 |
return(0); |
178 |
} |
179 |
|
180 |
|
181 |
init() /* get data and open window */ |
182 |
{ |
183 |
register int i; |
184 |
OpaqueFrame mainframe; |
185 |
char defgeom[32]; |
186 |
|
187 |
if (fname != NULL) { |
188 |
scanpos = (long *)malloc(ymax*sizeof(long)); |
189 |
if (scanpos == NULL) |
190 |
goto memerr; |
191 |
for (i = 0; i < ymax; i++) |
192 |
scanpos[i] = -1; |
193 |
} |
194 |
if (XOpenDisplay(NULL) == NULL) |
195 |
quiterr("can't open display; DISPLAY variable set?"); |
196 |
#ifdef notdef |
197 |
if (DisplayWidth() - 2*BORWIDTH < xmax || |
198 |
DisplayHeight() - 2*BORWIDTH - BARHEIGHT < ymax) |
199 |
quiterr("resolution mismatch"); |
200 |
#endif |
201 |
if (maxcolors == 0) { /* get number of available colors */ |
202 |
maxcolors = 1<<DisplayPlanes(); |
203 |
if (maxcolors > 4) maxcolors -= 2; |
204 |
} |
205 |
/* store image */ |
206 |
getras(); |
207 |
|
208 |
mainframe.bdrwidth = BORWIDTH; |
209 |
mainframe.border = WhitePixmap; |
210 |
mainframe.background = BlackPixmap; |
211 |
sprintf(defgeom, "=%dx%d+0+22", xmax, ymax); |
212 |
wind = XCreate("Radiance Image", progname, geometry, defgeom, |
213 |
&mainframe, 16, 16); |
214 |
if (wind == 0) |
215 |
quiterr("can't create window"); |
216 |
width = mainframe.width; |
217 |
height = mainframe.height; |
218 |
fontid = XGetFont(FONTNAME); |
219 |
if (fontid == 0) |
220 |
quiterr("can't get font"); |
221 |
XStoreName(wind, fname == NULL ? progname : fname); |
222 |
XDefineCursor(wind, XCreateCursor(bcross_width, bcross_height, |
223 |
bcross_bits, bcross_mask_bits, |
224 |
bcross_x_hot, bcross_y_hot, |
225 |
BlackPixel, WhitePixel, GXcopy)); |
226 |
XSelectInput(wind, ButtonPressed|ButtonReleased|UnmapWindow |
227 |
|RightDownMotion|MiddleDownMotion|LeftDownMotion |
228 |
|KeyPressed|ExposeWindow|ExposeRegion); |
229 |
XMapWindow(wind); |
230 |
return; |
231 |
memerr: |
232 |
quiterr("out of memory"); |
233 |
} |
234 |
|
235 |
|
236 |
quiterr(err) /* print message and exit */ |
237 |
char *err; |
238 |
{ |
239 |
if (err != NULL) |
240 |
fprintf(stderr, "%s: %s\n", progname, err); |
241 |
|
242 |
exit(err == NULL ? 0 : 1); |
243 |
} |
244 |
|
245 |
|
246 |
void |
247 |
eputs(s) |
248 |
char *s; |
249 |
{ |
250 |
fputs(s, stderr); |
251 |
} |
252 |
|
253 |
|
254 |
void |
255 |
quit(code) |
256 |
int code; |
257 |
{ |
258 |
exit(code); |
259 |
} |
260 |
|
261 |
|
262 |
getras() /* get raster file */ |
263 |
{ |
264 |
colormap ourmap; |
265 |
|
266 |
ourras = (XRASTER *)calloc(1, sizeof(XRASTER)); |
267 |
if (ourras == NULL) |
268 |
goto memerr; |
269 |
ourras->width = xmax; |
270 |
ourras->height = ymax; |
271 |
if (maxcolors <= 2) { /* monochrome */ |
272 |
ourras->data.m = (unsigned short *)malloc(BitmapSize(xmax,ymax)); |
273 |
if (ourras->data.m == NULL) |
274 |
goto memerr; |
275 |
getmono(); |
276 |
} else { |
277 |
ourras->data.bz = (unsigned char *)malloc(BZPixmapSize(xmax,ymax)); |
278 |
if (ourras->data.bz == NULL) |
279 |
goto memerr; |
280 |
if (greyscale) |
281 |
biq(dither,maxcolors,1,ourmap); |
282 |
else |
283 |
ciq(dither,maxcolors,1,ourmap); |
284 |
if (init_rcolors(ourras, ourmap) == 0) |
285 |
goto memerr; |
286 |
} |
287 |
return; |
288 |
memerr: |
289 |
quiterr("out of memory"); |
290 |
} |
291 |
|
292 |
|
293 |
getevent() /* process the next event */ |
294 |
{ |
295 |
WindowInfo info; |
296 |
XEvent e; |
297 |
|
298 |
XNextEvent(&e); |
299 |
switch (e.type) { |
300 |
case KeyPressed: |
301 |
docom(&e); |
302 |
break; |
303 |
case ExposeWindow: |
304 |
XQueryWindow(wind, &info); /* in case resized */ |
305 |
width = info.width; |
306 |
height = info.height; |
307 |
/* fall through */ |
308 |
case ExposeRegion: |
309 |
fixwindow(&e); |
310 |
break; |
311 |
case UnmapWindow: |
312 |
unmap_rcolors(ourras); |
313 |
break; |
314 |
case ButtonPressed: |
315 |
if (controlshift(&e)) |
316 |
moveimage(&e); |
317 |
else |
318 |
getbox(&e); |
319 |
break; |
320 |
} |
321 |
} |
322 |
|
323 |
|
324 |
fixwindow(eexp) /* fix new or stepped-on window */ |
325 |
XExposeEvent *eexp; |
326 |
{ |
327 |
redraw(eexp->x, eexp->y, eexp->width, eexp->height); |
328 |
} |
329 |
|
330 |
|
331 |
redraw(x, y, w, h) /* redraw section of window */ |
332 |
int x, y; |
333 |
int w, h; |
334 |
{ |
335 |
if (ourras->ncolors && map_rcolors(ourras) == NULL) { |
336 |
fprintf(stderr, "%s: cannot allocate colors\n", progname); |
337 |
return(-1); |
338 |
} |
339 |
if (fast) |
340 |
make_rpixmap(ourras); |
341 |
return(patch_raster(wind,x-xoff,y-yoff,x,y,w,h,ourras) ? 0 : -1); |
342 |
} |
343 |
|
344 |
|
345 |
docom(ekey) /* execute command */ |
346 |
XKeyEvent *ekey; |
347 |
{ |
348 |
char buf[80]; |
349 |
COLOR cval; |
350 |
Color cvx; |
351 |
char *cp; |
352 |
int n; |
353 |
double comp; |
354 |
FVECT rorg, rdir; |
355 |
|
356 |
cp = XLookupMapping(ekey, &n); |
357 |
if (n == 0) |
358 |
return(0); |
359 |
switch (*cp) { /* interpret command */ |
360 |
case 'q': |
361 |
case CTRL('D'): /* quit */ |
362 |
quit(0); |
363 |
case '\n': |
364 |
case '\r': |
365 |
case 'l': |
366 |
case 'c': /* value */ |
367 |
if (avgbox(cval) == -1) |
368 |
return(-1); |
369 |
switch (*cp) { |
370 |
case '\n': |
371 |
case '\r': /* radiance */ |
372 |
sprintf(buf, "%.3f", intens(cval)/exposure); |
373 |
break; |
374 |
case 'l': /* luminance */ |
375 |
sprintf(buf, "%.0fL", luminance(cval)/exposure); |
376 |
break; |
377 |
case 'c': /* color */ |
378 |
comp = pow(2.0, (double)scale); |
379 |
sprintf(buf, "(%.2f,%.2f,%.2f)", |
380 |
colval(cval,RED)*comp, |
381 |
colval(cval,GRN)*comp, |
382 |
colval(cval,BLU)*comp); |
383 |
break; |
384 |
} |
385 |
XText(wind, box.xmin, box.ymin, buf, strlen(buf), |
386 |
fontid, BlackPixel, WhitePixel); |
387 |
return(0); |
388 |
case 'i': /* identify (contour) */ |
389 |
if (ourras->pixels == NULL) |
390 |
return(-1); |
391 |
n = ourras->data.bz[ekey->x-xoff+BZPixmapSize(xmax,ekey->y-yoff)]; |
392 |
n = ourras->pmap[n]; |
393 |
cvx.pixel = ourras->cdefs[n].pixel; |
394 |
cvx.red = random() & 65535; |
395 |
cvx.green = random() & 65535; |
396 |
cvx.blue = random() & 65535; |
397 |
XStoreColor(&cvx); |
398 |
return(0); |
399 |
case 'p': /* position */ |
400 |
sprintf(buf, "(%d,%d)", ekey->x-xoff, ymax-1-ekey->y+yoff); |
401 |
XText(wind, ekey->x, ekey->y, buf, strlen(buf), |
402 |
fontid, BlackPixel, WhitePixel); |
403 |
return(0); |
404 |
case 't': /* trace */ |
405 |
if (!gotview) { |
406 |
XFeep(0); |
407 |
return(-1); |
408 |
} |
409 |
if (viewray(rorg, rdir, &ourview, (ekey->x-xoff+.5)/xmax, |
410 |
(ymax-1-ekey->y+yoff+.5)/ymax) < 0) |
411 |
return(-1); |
412 |
printf("%e %e %e ", rorg[0], rorg[1], rorg[2]); |
413 |
printf("%e %e %e\n", rdir[0], rdir[1], rdir[2]); |
414 |
fflush(stdout); |
415 |
return(0); |
416 |
case '=': /* adjust exposure */ |
417 |
if (avgbox(cval) == -1) |
418 |
return(-1); |
419 |
n = log(.5/bright(cval))/.69315 - scale; /* truncate */ |
420 |
if (n == 0) |
421 |
return(0); |
422 |
scale_rcolors(ourras, pow(2.0, (double)n)); |
423 |
scale += n; |
424 |
sprintf(buf, "%+d", scale); |
425 |
XText(wind, box.xmin, box.ymin, buf, strlen(buf), |
426 |
fontid, BlackPixel, WhitePixel); |
427 |
XFlush(); |
428 |
free_raster(ourras); |
429 |
getras(); |
430 |
/* fall through */ |
431 |
case CTRL('R'): /* redraw */ |
432 |
case CTRL('L'): |
433 |
unmap_rcolors(ourras); |
434 |
XClear(wind); |
435 |
return(redraw(0, 0, width, height)); |
436 |
case ' ': /* clear */ |
437 |
return(redraw(box.xmin, box.ymin, box.xsiz, box.ysiz)); |
438 |
default: |
439 |
XFeep(0); |
440 |
return(-1); |
441 |
} |
442 |
} |
443 |
|
444 |
|
445 |
moveimage(ep) /* shift the image */ |
446 |
XButtonEvent *ep; |
447 |
{ |
448 |
XButtonEvent eb; |
449 |
|
450 |
XMaskEvent(ButtonReleased, &eb); |
451 |
xoff += eb.x - ep->x; |
452 |
yoff += eb.y - ep->y; |
453 |
XClear(wind); |
454 |
return(redraw(0, 0, width, height)); |
455 |
} |
456 |
|
457 |
|
458 |
getbox(ebut) /* get new box */ |
459 |
XButtonEvent *ebut; |
460 |
{ |
461 |
union { |
462 |
XEvent e; |
463 |
XButtonEvent b; |
464 |
XMouseMovedEvent m; |
465 |
} e; |
466 |
|
467 |
XMaskEvent(ButtonReleased|MouseMoved, &e.e); |
468 |
while (e.e.type == MouseMoved) { |
469 |
revbox(ebut->x, ebut->y, box.xmin = e.m.x, box.ymin = e.m.y); |
470 |
XMaskEvent(ButtonReleased|MouseMoved, &e.e); |
471 |
revbox(ebut->x, ebut->y, box.xmin, box.ymin); |
472 |
} |
473 |
box.xmin = e.b.x<0 ? 0 : (e.b.x>=width ? width-1 : e.b.x); |
474 |
box.ymin = e.b.y<0 ? 0 : (e.b.y>=height ? height-1 : e.b.y); |
475 |
if (box.xmin > ebut->x) { |
476 |
box.xsiz = box.xmin - ebut->x + 1; |
477 |
box.xmin = ebut->x; |
478 |
} else { |
479 |
box.xsiz = ebut->x - box.xmin + 1; |
480 |
} |
481 |
if (box.ymin > ebut->y) { |
482 |
box.ysiz = box.ymin - ebut->y + 1; |
483 |
box.ymin = ebut->y; |
484 |
} else { |
485 |
box.ysiz = ebut->y - box.ymin + 1; |
486 |
} |
487 |
} |
488 |
|
489 |
|
490 |
revbox(x0, y0, x1, y1) /* draw box with reversed lines */ |
491 |
int x0, y0, x1, y1; |
492 |
{ |
493 |
XLine(wind, x0, y0, x1, y0, 1, 1, 0, GXinvert, AllPlanes); |
494 |
XLine(wind, x0, y1, x1, y1, 1, 1, 0, GXinvert, AllPlanes); |
495 |
XLine(wind, x0, y0, x0, y1, 1, 1, 0, GXinvert, AllPlanes); |
496 |
XLine(wind, x1, y0, x1, y1, 1, 1, 0, GXinvert, AllPlanes); |
497 |
} |
498 |
|
499 |
|
500 |
avgbox(clr) /* average color over current box */ |
501 |
COLOR clr; |
502 |
{ |
503 |
int left, right, top, bottom; |
504 |
int y; |
505 |
double d; |
506 |
COLOR ctmp; |
507 |
register int x; |
508 |
|
509 |
setcolor(clr, 0.0, 0.0, 0.0); |
510 |
left = box.xmin - xoff; |
511 |
right = left + box.xsiz; |
512 |
if (left < 0) |
513 |
left = 0; |
514 |
if (right > xmax) |
515 |
right = xmax; |
516 |
if (left >= right) |
517 |
return(-1); |
518 |
top = box.ymin - yoff; |
519 |
bottom = top + box.ysiz; |
520 |
if (top < 0) |
521 |
top = 0; |
522 |
if (bottom > ymax) |
523 |
bottom = ymax; |
524 |
if (top >= bottom) |
525 |
return(-1); |
526 |
for (y = top; y < bottom; y++) { |
527 |
if (getscan(y) == -1) |
528 |
return(-1); |
529 |
for (x = left; x < right; x++) { |
530 |
colr_color(ctmp, scanline[x]); |
531 |
addcolor(clr, ctmp); |
532 |
} |
533 |
} |
534 |
d = 1.0/((right-left)*(bottom-top)); |
535 |
scalecolor(clr, d); |
536 |
return(0); |
537 |
} |
538 |
|
539 |
|
540 |
getmono() /* get monochrome data */ |
541 |
{ |
542 |
register unsigned short *dp; |
543 |
register int x, err; |
544 |
int y, errp; |
545 |
rgbpixel *inl; |
546 |
short *cerr; |
547 |
|
548 |
if ((inl = (rgbpixel *)malloc(xmax*sizeof(rgbpixel))) == NULL |
549 |
|| (cerr = (short *)calloc(xmax,sizeof(short))) == NULL) |
550 |
quiterr("out of memory in getmono"); |
551 |
dp = ourras->data.m - 1; |
552 |
for (y = 0; y < ymax; y++) { |
553 |
picreadline3(y, inl); |
554 |
err = 0; |
555 |
for (x = 0; x < xmax; x++) { |
556 |
if (!(x&0xf)) |
557 |
*++dp = 0; |
558 |
errp = err; |
559 |
err += rgb_bright(&inl[x]) + cerr[x]; |
560 |
if (err > 127) |
561 |
err -= 255; |
562 |
else |
563 |
*dp |= 1<<(x&0xf); |
564 |
err /= 3; |
565 |
cerr[x] = err + errp; |
566 |
} |
567 |
} |
568 |
free((void *)inl); |
569 |
free((void *)cerr); |
570 |
} |
571 |
|
572 |
|
573 |
init_rcolors(xr, cmap) /* (re)assign color values */ |
574 |
register XRASTER *xr; |
575 |
colormap cmap; |
576 |
{ |
577 |
register int i; |
578 |
register unsigned char *p; |
579 |
|
580 |
xr->pmap = (int *)malloc(256*sizeof(int)); |
581 |
if (xr->pmap == NULL) |
582 |
return(0); |
583 |
xr->cdefs = (Color *)malloc(256*sizeof(Color)); |
584 |
if (xr->cdefs == NULL) |
585 |
return(0); |
586 |
for (i = 0; i < 256; i++) |
587 |
xr->pmap[i] = -1; |
588 |
xr->ncolors = 0; |
589 |
for (p = xr->data.bz, i = BZPixmapSize(xr->width,xr->height); i--; p++) |
590 |
if (xr->pmap[*p] == -1) { |
591 |
xr->cdefs[xr->ncolors].red = cmap[0][*p] << 8; |
592 |
xr->cdefs[xr->ncolors].green = cmap[1][*p] << 8; |
593 |
xr->cdefs[xr->ncolors].blue = cmap[2][*p] << 8; |
594 |
xr->cdefs[xr->ncolors].pixel = *p; |
595 |
xr->pmap[*p] = xr->ncolors++; |
596 |
} |
597 |
xr->cdefs = (Color *)realloc((void *)xr->cdefs, xr->ncolors*sizeof(Color)); |
598 |
if (xr->cdefs == NULL) |
599 |
return(0); |
600 |
return(1); |
601 |
} |
602 |
|
603 |
|
604 |
scale_rcolors(xr, sf) /* scale color map */ |
605 |
register XRASTER *xr; |
606 |
double sf; |
607 |
{ |
608 |
register int i; |
609 |
long maxv; |
610 |
|
611 |
if (xr->pixels == NULL) |
612 |
return; |
613 |
|
614 |
sf = pow(sf, 1.0/gamcor); |
615 |
maxv = 65535/sf; |
616 |
|
617 |
for (i = xr->ncolors; i--; ) { |
618 |
xr->cdefs[i].red = xr->cdefs[i].red > maxv ? |
619 |
65535 : |
620 |
xr->cdefs[i].red * sf; |
621 |
xr->cdefs[i].green = xr->cdefs[i].green > maxv ? |
622 |
65535 : |
623 |
xr->cdefs[i].green * sf; |
624 |
xr->cdefs[i].blue = xr->cdefs[i].blue > maxv ? |
625 |
65535 : |
626 |
xr->cdefs[i].blue * sf; |
627 |
} |
628 |
XStoreColors(xr->ncolors, xr->cdefs); |
629 |
} |
630 |
|
631 |
|
632 |
getscan(y) |
633 |
int y; |
634 |
{ |
635 |
if (y != cury) { |
636 |
if (scanpos == NULL || scanpos[y] == -1) |
637 |
return(-1); |
638 |
if (fseek(fin, scanpos[y], 0) == -1) |
639 |
quiterr("fseek error"); |
640 |
cury = y; |
641 |
} else if (scanpos != NULL && scanpos[y] == -1) |
642 |
scanpos[y] = ftell(fin); |
643 |
|
644 |
if (freadcolrs(scanline, xmax, fin) < 0) |
645 |
quiterr("read error"); |
646 |
|
647 |
cury++; |
648 |
return(0); |
649 |
} |
650 |
|
651 |
|
652 |
picreadline3(y, l3) /* read in 3-byte scanline */ |
653 |
int y; |
654 |
register rgbpixel *l3; |
655 |
{ |
656 |
register int i; |
657 |
/* read scanline */ |
658 |
if (getscan(y) < 0) |
659 |
quiterr("cannot seek for picreadline"); |
660 |
/* convert scanline */ |
661 |
normcolrs(scanline, xmax, scale); |
662 |
for (i = 0; i < xmax; i++) { |
663 |
l3[i].r = scanline[i][RED]; |
664 |
l3[i].g = scanline[i][GRN]; |
665 |
l3[i].b = scanline[i][BLU]; |
666 |
} |
667 |
} |
668 |
|
669 |
|
670 |
picwriteline(y, l) /* add 8-bit scanline to image */ |
671 |
int y; |
672 |
pixel *l; |
673 |
{ |
674 |
memcpy((void *)ourras->data.bz+BZPixmapSize(xmax,y), (void *)l, BZPixmapSize(xmax,1)); |
675 |
} |
676 |
|
677 |
|
678 |
picreadcm(map) /* do gamma correction */ |
679 |
colormap map; |
680 |
{ |
681 |
extern double pow(); |
682 |
register int i, val; |
683 |
|
684 |
for (i = 0; i < 256; i++) { |
685 |
val = pow((i+0.5)/256.0, 1.0/gamcor) * 256.0; |
686 |
map[0][i] = map[1][i] = map[2][i] = val; |
687 |
} |
688 |
} |
689 |
|
690 |
|
691 |
picwritecm(map) /* handled elsewhere */ |
692 |
colormap map; |
693 |
{ |
694 |
#ifdef DEBUG |
695 |
register int i; |
696 |
|
697 |
for (i = 0; i < 256; i++) |
698 |
printf("%d %d %d\n", map[0][i],map[1][i],map[2][i]); |
699 |
#endif |
700 |
} |