1 |
/* Copyright (c) 1990 Regents of the University of California */ |
2 |
|
3 |
#ifndef lint |
4 |
static char SCCSid[] = "$SunId$ LBL"; |
5 |
#endif |
6 |
|
7 |
/* |
8 |
* x11image.c - driver for X-windows |
9 |
* |
10 |
* 3/1/90 |
11 |
*/ |
12 |
|
13 |
/* |
14 |
* Modified for X11 |
15 |
* |
16 |
* January 1990 |
17 |
* |
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* Anat Grynberg and Greg Ward |
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*/ |
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|
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|
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#include "standard.h" |
23 |
|
24 |
#include <X11/Xlib.h> |
25 |
#include <X11/cursorfont.h> |
26 |
#include <X11/Xutil.h> |
27 |
|
28 |
#include "color.h" |
29 |
#include "view.h" |
30 |
#include "pic.h" |
31 |
#include "x11raster.h" |
32 |
#include "random.h" |
33 |
|
34 |
#define FONTNAME "8x13" /* text font we'll use */ |
35 |
|
36 |
#define CTRL(c) ('c'-'@') |
37 |
|
38 |
#define BORWIDTH 5 /* border width */ |
39 |
|
40 |
#define ourscreen DefaultScreen(thedisplay) |
41 |
#define ourblack BlackPixel(thedisplay,ourscreen) |
42 |
#define ourwhite WhitePixel(thedisplay,ourscreen) |
43 |
#define ourroot RootWindow(thedisplay,ourscreen) |
44 |
#define ourgc DefaultGC(thedisplay,ourscreen) |
45 |
|
46 |
double gamcor = 2.2; /* gamma correction */ |
47 |
|
48 |
int dither = 1; /* dither colors? */ |
49 |
int fast = 0; /* keep picture in Pixmap? */ |
50 |
|
51 |
Window wind = 0; /* our output window */ |
52 |
Font fontid; /* our font */ |
53 |
|
54 |
long maxcolors = 0; /* maximum colors */ |
55 |
int greyscale = 0; /* in grey */ |
56 |
|
57 |
int scale = 0; /* scalefactor; power of two */ |
58 |
|
59 |
int xoff = 0; /* x image offset */ |
60 |
int yoff = 0; /* y image offset */ |
61 |
|
62 |
VIEW ourview = STDVIEW; /* image view parameters */ |
63 |
int gotview = 0; /* got parameters from file */ |
64 |
|
65 |
COLR *scanline; /* scan line buffer */ |
66 |
|
67 |
int xmax, ymax; /* picture resolution */ |
68 |
int width, height; /* window size */ |
69 |
char *fname = NULL; /* input file name */ |
70 |
FILE *fin = stdin; /* input file */ |
71 |
long *scanpos = NULL; /* scan line positions in file */ |
72 |
int cury = 0; /* current scan location */ |
73 |
|
74 |
double exposure = 1.0; /* exposure compensation used */ |
75 |
|
76 |
XRASTER *ourras; /* our stored image */ |
77 |
unsigned char *ourdata; /* our image data */ |
78 |
|
79 |
struct { |
80 |
int xmin, ymin, xsiz, ysiz; |
81 |
} box = {0, 0, 0, 0}; /* current box */ |
82 |
|
83 |
char *geometry = NULL; /* geometry specification */ |
84 |
|
85 |
char *progname; |
86 |
|
87 |
char errmsg[128]; |
88 |
|
89 |
extern long ftell(); |
90 |
|
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extern char *malloc(), *calloc(); |
92 |
|
93 |
extern double atof(), pow(), log(); |
94 |
|
95 |
Display *thedisplay; |
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|
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main(argc, argv) |
98 |
int argc; |
99 |
char *argv[]; |
100 |
{ |
101 |
int headline(); |
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int i; |
103 |
|
104 |
progname = argv[0]; |
105 |
|
106 |
for (i = 1; i < argc; i++) |
107 |
if (argv[i][0] == '-') |
108 |
switch (argv[i][1]) { |
109 |
case 'c': |
110 |
maxcolors = atoi(argv[++i]); |
111 |
break; |
112 |
case 'b': |
113 |
greyscale = !greyscale; |
114 |
break; |
115 |
case 'm': |
116 |
maxcolors = 2; |
117 |
break; |
118 |
case 'd': |
119 |
dither = !dither; |
120 |
break; |
121 |
case 'f': |
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fast = !fast; |
123 |
break; |
124 |
case 'e': |
125 |
if (argv[i+1][0] != '+' && argv[i+1][0] != '-') |
126 |
goto userr; |
127 |
scale = atoi(argv[++i]); |
128 |
break; |
129 |
case 'g': |
130 |
if (!strcmp(argv[i], "-geometry")) |
131 |
geometry = argv[++i]; |
132 |
else |
133 |
gamcor = atof(argv[++i]); |
134 |
break; |
135 |
default: |
136 |
goto userr; |
137 |
} |
138 |
else |
139 |
break; |
140 |
|
141 |
if (argc-i == 1) { |
142 |
fname = argv[i]; |
143 |
fin = fopen(fname, "r"); |
144 |
if (fin == NULL) { |
145 |
sprintf(errmsg, "can't open file \"%s\"", fname); |
146 |
quiterr(errmsg); |
147 |
} |
148 |
} |
149 |
/* get header */ |
150 |
getheader(fin, headline); |
151 |
/* get picture dimensions */ |
152 |
if (fgetresolu(&xmax, &ymax, fin) != (YMAJOR|YDECR)) |
153 |
quiterr("bad picture size"); |
154 |
/* set view parameters */ |
155 |
if (gotview && setview(&ourview) != NULL) |
156 |
gotview = 0; |
157 |
if ((scanline = (COLR *)malloc(xmax*sizeof(COLR))) == NULL) |
158 |
quiterr("out of memory"); |
159 |
|
160 |
init(); /* get file and open window */ |
161 |
|
162 |
for ( ; ; ) |
163 |
getevent(); /* main loop */ |
164 |
userr: |
165 |
fprintf(stderr, |
166 |
"Usage: %s [-geometry spec][-b][-m][-d][-f][-c ncolors][-e +/-stops] file\n", |
167 |
progname); |
168 |
quit(1); |
169 |
} |
170 |
|
171 |
|
172 |
headline(s) /* get relevant info from header */ |
173 |
char *s; |
174 |
{ |
175 |
static char *altname[] = {"rview","rpict","pinterp",VIEWSTR,NULL}; |
176 |
register char **an; |
177 |
|
178 |
if (!strncmp(s, "EXPOSURE=", 9)) |
179 |
exposure *= atof(s+9); |
180 |
else |
181 |
for (an = altname; *an != NULL; an++) |
182 |
if (!strncmp(*an, s, strlen(*an))) { |
183 |
if (sscanview(&ourview, s+strlen(*an)) == 0) |
184 |
gotview++; |
185 |
return; |
186 |
} |
187 |
} |
188 |
|
189 |
|
190 |
init() /* get data and open window */ |
191 |
{ |
192 |
XSizeHints oursizhints; |
193 |
register int i; |
194 |
|
195 |
if (fname != NULL) { |
196 |
scanpos = (long *)malloc(ymax*sizeof(long)); |
197 |
if (scanpos == NULL) |
198 |
goto memerr; |
199 |
for (i = 0; i < ymax; i++) |
200 |
scanpos[i] = -1; |
201 |
} |
202 |
if ((thedisplay = XOpenDisplay(NULL)) == NULL) |
203 |
quiterr("can't open display; DISPLAY variable set?"); |
204 |
wind = XCreateSimpleWindow(thedisplay, |
205 |
ourroot, 0, 0, xmax, ymax, BORWIDTH, ourblack, ourwhite); |
206 |
if (wind == 0) |
207 |
quiterr("can't create window"); |
208 |
if (maxcolors == 0) { /* get number of available colors */ |
209 |
maxcolors = 1<<DisplayPlanes(thedisplay,ourscreen); |
210 |
if (maxcolors > 4) maxcolors -= 2; |
211 |
} |
212 |
fontid = XLoadFont(thedisplay, FONTNAME); |
213 |
if (fontid == 0) |
214 |
quiterr("can't get font"); |
215 |
XSetFont(thedisplay, ourgc, fontid); |
216 |
XStoreName(thedisplay, wind, fname == NULL ? progname : fname); |
217 |
XDefineCursor(thedisplay, wind, XCreateFontCursor(thedisplay, |
218 |
XC_diamond_cross)); |
219 |
if (geometry != NULL) { |
220 |
bzero((char *)&oursizhints, sizeof(oursizhints)); |
221 |
i = XParseGeometry(geometry, &oursizhints.x, &oursizhints.y, |
222 |
&oursizhints.width, &oursizhints.height); |
223 |
if (i & (XValue|YValue) == (XValue|YValue)) { |
224 |
oursizhints.flags |= USPosition; |
225 |
if (i & XNegative) |
226 |
oursizhints.x += DisplayWidth(thedisplay,ourscreen)-1; |
227 |
if (i & YNegative) |
228 |
oursizhints.y += DisplayHeight(thedisplay,ourscreen)-1; |
229 |
} |
230 |
if (i & (WidthValue|HeightValue) == (WidthValue|HeightValue)) |
231 |
oursizhints.flags |= USSize; |
232 |
XSetNormalHints(thedisplay, wind, &oursizhints); |
233 |
} |
234 |
/* store image */ |
235 |
getras(); |
236 |
XSelectInput(thedisplay, wind, ButtonPressMask|ButtonReleaseMask| |
237 |
StructureNotifyMask|ButtonMotionMask| |
238 |
KeyPressMask|ExposureMask); |
239 |
XMapWindow(thedisplay, wind); |
240 |
return; |
241 |
memerr: |
242 |
quiterr("out of memory"); |
243 |
} /* end of init */ |
244 |
|
245 |
|
246 |
quiterr(err) /* print message and exit */ |
247 |
char *err; |
248 |
{ |
249 |
if (err != NULL) { |
250 |
fprintf(stderr, "%s: %s\n", progname, err); |
251 |
exit(1); |
252 |
} |
253 |
exit(0); |
254 |
} |
255 |
|
256 |
|
257 |
eputs(s) |
258 |
char *s; |
259 |
{ |
260 |
fputs(s, stderr); |
261 |
} |
262 |
|
263 |
|
264 |
quit(code) |
265 |
int code; |
266 |
{ |
267 |
exit(code); |
268 |
} |
269 |
|
270 |
|
271 |
getras() /* get raster file */ |
272 |
{ |
273 |
colormap ourmap; |
274 |
unsigned char rmap[256], gmap[256], bmap[256]; |
275 |
XVisualInfo vinfo; |
276 |
register int i; |
277 |
|
278 |
if (maxcolors <= 2) { /* monochrome */ |
279 |
ourdata = (unsigned char *)malloc(ymax*((xmax+7)/8)); |
280 |
if (ourdata == NULL) |
281 |
goto fail; |
282 |
ourras = make_raster(thedisplay, ourscreen, 1, ourdata, |
283 |
xmax, ymax, 8); |
284 |
if (ourras == NULL) |
285 |
goto fail; |
286 |
getmono(); |
287 |
} else if (XMatchVisualInfo(thedisplay,ourscreen,24,TrueColor,&vinfo)) { |
288 |
ourdata = (unsigned char *)malloc(xmax*ymax*3); |
289 |
if (ourdata == NULL) |
290 |
goto fail; |
291 |
ourras = make_raster(thedisplay, ourscreen, 24, ourdata, |
292 |
xmax, ymax, 8); |
293 |
if (ourras == NULL) |
294 |
goto fail; |
295 |
getfull(); |
296 |
} else { |
297 |
ourdata = (unsigned char *)malloc(xmax*ymax); |
298 |
if (ourdata == NULL) |
299 |
goto fail; |
300 |
ourras = make_raster(thedisplay, ourscreen, 8, ourdata, |
301 |
xmax, ymax, 8); |
302 |
if (ourras == NULL) |
303 |
goto fail; |
304 |
if (greyscale) |
305 |
biq(dither,maxcolors,1,ourmap); |
306 |
else |
307 |
ciq(dither,maxcolors,1,ourmap); |
308 |
for (i = 0; i < 256; i++) { |
309 |
rmap[i] = ourmap[0][i]; |
310 |
gmap[i] = ourmap[1][i]; |
311 |
bmap[i] = ourmap[2][i]; |
312 |
} |
313 |
if (init_rcolors(ourras, rmap, gmap, bmap) == 0) |
314 |
goto fail; |
315 |
} |
316 |
return; |
317 |
fail: |
318 |
quit("could not create raster image"); |
319 |
} |
320 |
|
321 |
|
322 |
getevent() /* process the next event */ |
323 |
{ |
324 |
union { |
325 |
XEvent u; |
326 |
XConfigureEvent c; |
327 |
XExposeEvent e; |
328 |
XButtonPressedEvent b; |
329 |
XKeyPressedEvent k; |
330 |
} e; |
331 |
|
332 |
XNextEvent(thedisplay, &e.u); |
333 |
switch (e.u.type) { |
334 |
case KeyPress: |
335 |
docom(&e.k); |
336 |
break; |
337 |
case ConfigureNotify: |
338 |
width = e.c.width; |
339 |
height = e.c.height; |
340 |
break; |
341 |
case MapNotify: |
342 |
map_rcolors(ourras, wind); |
343 |
if (fast) |
344 |
make_rpixmap(ourras); |
345 |
break; |
346 |
case UnmapNotify: |
347 |
unmap_rcolors(ourras); |
348 |
break; |
349 |
case Expose: |
350 |
redraw(e.e.x, e.e.y, e.e.width, e.e.height); |
351 |
break; |
352 |
case ButtonPress: |
353 |
if (e.b.state & (ShiftMask|ControlMask)) |
354 |
moveimage(&e.b); |
355 |
else |
356 |
getbox(&e.b); |
357 |
break; |
358 |
} |
359 |
} |
360 |
|
361 |
|
362 |
redraw(x, y, w, h) /* redraw section of window */ |
363 |
int x, y; |
364 |
int w, h; |
365 |
{ |
366 |
patch_raster(wind,x-xoff,y-yoff,x,y,w,h,ourras); |
367 |
} |
368 |
|
369 |
|
370 |
docom(ekey) /* execute command */ |
371 |
XKeyPressedEvent *ekey; |
372 |
{ |
373 |
char buf[80]; |
374 |
COLOR cval; |
375 |
XColor cvx; |
376 |
int com, n; |
377 |
double comp; |
378 |
FVECT rorg, rdir; |
379 |
|
380 |
n = XLookupString(ekey, buf, sizeof(buf), NULL, NULL); |
381 |
if (n == 0) |
382 |
return(0); |
383 |
com = buf[0]; |
384 |
switch (com) { /* interpret command */ |
385 |
case 'q': |
386 |
case CTRL(D): /* quit */ |
387 |
quit(0); |
388 |
case '\n': |
389 |
case '\r': |
390 |
case 'l': |
391 |
case 'c': /* value */ |
392 |
if (avgbox(cval) == -1) |
393 |
return(-1); |
394 |
switch (com) { |
395 |
case '\n': |
396 |
case '\r': /* radiance */ |
397 |
sprintf(buf, "%.3f", intens(cval)/exposure); |
398 |
break; |
399 |
case 'l': /* luminance */ |
400 |
sprintf(buf, "%.0fn", bright(cval)*683.0/exposure); |
401 |
break; |
402 |
case 'c': /* color */ |
403 |
comp = pow(2.0, (double)scale); |
404 |
sprintf(buf, "(%.2f,%.2f,%.2f)", |
405 |
colval(cval,RED)*comp, |
406 |
colval(cval,GRN)*comp, |
407 |
colval(cval,BLU)*comp); |
408 |
break; |
409 |
} |
410 |
XDrawImageString(thedisplay, wind, ourgc, box.xmin, box.ymin, |
411 |
buf, strlen(buf)); |
412 |
return(0); |
413 |
case 'i': /* identify (contour) */ |
414 |
if (ourras->pixels == NULL) |
415 |
return(-1); |
416 |
n = ourdata[ekey->x-xoff+xmax*(ekey->y-yoff)]; |
417 |
n = ourras->pmap[n]; |
418 |
cvx.pixel = ourras->cdefs[n].pixel; |
419 |
cvx.red = random() & 65535; |
420 |
cvx.green = random() & 65535; |
421 |
cvx.blue = random() & 65535; |
422 |
XStoreColors(thedisplay, ourras->cmap, &cvx, 1); |
423 |
return(0); |
424 |
case 'p': /* position */ |
425 |
sprintf(buf, "(%d,%d)", ekey->x-xoff, ymax-1-ekey->y+yoff); |
426 |
XDrawImageString(thedisplay, wind, ourgc, ekey->x, ekey->y, |
427 |
buf, strlen(buf)); |
428 |
return(0); |
429 |
case 't': /* trace */ |
430 |
if (!gotview) { |
431 |
XBell(thedisplay, 0); |
432 |
return(-1); |
433 |
} |
434 |
viewray(rorg, rdir, &ourview, |
435 |
(ekey->x-xoff+.5)/xmax, |
436 |
(ymax-1-ekey->y+yoff+.5)/ymax); |
437 |
printf("%e %e %e ", rorg[0], rorg[1], rorg[2]); |
438 |
printf("%e %e %e\n", rdir[0], rdir[1], rdir[2]); |
439 |
fflush(stdout); |
440 |
return(0); |
441 |
case '=': /* adjust exposure */ |
442 |
if (avgbox(cval) == -1) |
443 |
return(-1); |
444 |
n = log(.5/bright(cval))/.69315 - scale; /* truncate */ |
445 |
if (n == 0) |
446 |
return(0); |
447 |
scale_rcolors(ourras, pow(2.0, (double)n)); |
448 |
scale += n; |
449 |
sprintf(buf, "%+d", scale); |
450 |
XDrawImageString(thedisplay, wind, ourgc, box.xmin, box.ymin, |
451 |
buf, strlen(buf)); |
452 |
XFlush(thedisplay); |
453 |
free(ourdata); |
454 |
free_raster(ourras); |
455 |
getras(); |
456 |
/* fall through */ |
457 |
case CTRL(R): /* redraw */ |
458 |
case CTRL(L): |
459 |
unmap_rcolors(ourras); |
460 |
XClearWindow(thedisplay, wind); |
461 |
map_rcolors(ourras, wind); |
462 |
if (fast) |
463 |
make_rpixmap(ourras); |
464 |
redraw(0, 0, width, height); |
465 |
return(0); |
466 |
case ' ': /* clear */ |
467 |
redraw(box.xmin, box.ymin, box.xsiz, box.ysiz); |
468 |
return(0); |
469 |
default: |
470 |
XBell(0); |
471 |
return(-1); |
472 |
} |
473 |
} |
474 |
|
475 |
|
476 |
moveimage(ep) /* shift the image */ |
477 |
XButtonPressedEvent *ep; |
478 |
{ |
479 |
XButtonPressedEvent eb; |
480 |
|
481 |
XMaskEvent(thedisplay, ButtonReleaseMask, &eb); |
482 |
xoff += eb.x - ep->x; |
483 |
yoff += eb.y - ep->y; |
484 |
XClearWindow(thedisplay, wind); |
485 |
redraw(0, 0, width, height); |
486 |
return(0); |
487 |
} |
488 |
|
489 |
|
490 |
getbox(ebut) /* get new box */ |
491 |
XButtonPressedEvent *ebut; |
492 |
{ |
493 |
union { |
494 |
XEvent e; |
495 |
XButtonReleasedEvent b; |
496 |
XPointerMovedEvent m; |
497 |
} e; |
498 |
|
499 |
XMaskEvent(thedisplay, ButtonReleaseMask|ButtonMotionMask, &e.e); |
500 |
while (e.e.type == ButtonMotionMask) { |
501 |
revbox(ebut->x, ebut->y, box.xmin = e.m.x, box.ymin = e.m.y); |
502 |
XMaskEvent(thedisplay, ButtonReleaseMask|ButtonMotionMask, |
503 |
&e.e); |
504 |
revbox(ebut->x, ebut->y, box.xmin, box.ymin); |
505 |
} |
506 |
box.xmin = e.b.x<0 ? 0 : (e.b.x>=width ? width-1 : e.b.x); |
507 |
box.ymin = e.b.y<0 ? 0 : (e.b.y>=height ? height-1 : e.b.y); |
508 |
if (box.xmin > ebut->x) { |
509 |
box.xsiz = box.xmin - ebut->x + 1; |
510 |
box.xmin = ebut->x; |
511 |
} else { |
512 |
box.xsiz = ebut->x - box.xmin + 1; |
513 |
} |
514 |
if (box.ymin > ebut->y) { |
515 |
box.ysiz = box.ymin - ebut->y + 1; |
516 |
box.ymin = ebut->y; |
517 |
} else { |
518 |
box.ysiz = ebut->y - box.ymin + 1; |
519 |
} |
520 |
} |
521 |
|
522 |
|
523 |
revbox(x0, y0, x1, y1) /* draw box with reversed lines */ |
524 |
int x0, y0, x1, y1; |
525 |
{ |
526 |
static GC mygc = 0; |
527 |
|
528 |
if (mygc == 0) { |
529 |
mygc = XCreateGC(thedisplay, wind, 0, 0); |
530 |
XSetPlaneMask(thedisplay, mygc, ~0L); |
531 |
XSetFunction(thedisplay, mygc, GXinvert); |
532 |
} |
533 |
XDrawLine(thedisplay, wind, mygc, x0, y0, x1, y0); |
534 |
XDrawLine(thedisplay, wind, mygc, x0, y1, x1, y1); |
535 |
XDrawLine(thedisplay, wind, mygc, x0, y0, x0, y1); |
536 |
XDrawLine(thedisplay, wind, mygc, x1, y0, x1, y1); |
537 |
} /* end of revbox */ |
538 |
|
539 |
|
540 |
avgbox(clr) /* average color over current box */ |
541 |
COLOR clr; |
542 |
{ |
543 |
int left, right, top, bottom; |
544 |
int y; |
545 |
double d; |
546 |
COLOR ctmp; |
547 |
register int x; |
548 |
|
549 |
setcolor(clr, 0.0, 0.0, 0.0); |
550 |
left = box.xmin - xoff; |
551 |
right = left + box.xsiz; |
552 |
if (left < 0) |
553 |
left = 0; |
554 |
if (right > xmax) |
555 |
right = xmax; |
556 |
if (left >= right) |
557 |
return(-1); |
558 |
top = box.ymin - yoff; |
559 |
bottom = top + box.ysiz; |
560 |
if (top < 0) |
561 |
top = 0; |
562 |
if (bottom > ymax) |
563 |
bottom = ymax; |
564 |
if (top >= bottom) |
565 |
return(-1); |
566 |
for (y = top; y < bottom; y++) { |
567 |
if (getscan(y) == -1) |
568 |
return(-1); |
569 |
for (x = left; x < right; x++) { |
570 |
colr_color(ctmp, scanline[x]); |
571 |
addcolor(clr, ctmp); |
572 |
} |
573 |
} |
574 |
d = 1.0/((right-left)*(bottom-top)); |
575 |
scalecolor(clr, d); |
576 |
return(0); |
577 |
} |
578 |
|
579 |
|
580 |
getmono() /* get monochrome data */ |
581 |
{ |
582 |
register unsigned char *dp; |
583 |
register int x, err; |
584 |
int y; |
585 |
rgbpixel *inline; |
586 |
short *cerr; |
587 |
|
588 |
if ((inline = (rgbpixel *)malloc(xmax*sizeof(rgbpixel))) == NULL |
589 |
|| (cerr = (short *)calloc(xmax,sizeof(short))) == NULL) |
590 |
quit("out of memory in getmono"); |
591 |
dp = ourdata - 1; |
592 |
for (y = 0; y < ymax; y++) { |
593 |
picreadline3(y, inline); |
594 |
err = 0; |
595 |
for (x = 0; x < xmax; x++) { |
596 |
if (!(x&7)) |
597 |
*++dp = 0; |
598 |
err += rgb_bright(&inline[x]) + cerr[x]; |
599 |
if (err > 127) |
600 |
err -= 255; |
601 |
else |
602 |
*dp |= 1<<(x&07); |
603 |
cerr[x] = err >>= 1; |
604 |
} |
605 |
} |
606 |
free((char *)inline); |
607 |
free((char *)cerr); |
608 |
} |
609 |
|
610 |
|
611 |
getfull() /* get full (24-bit) data */ |
612 |
{ |
613 |
int y; |
614 |
|
615 |
for (y = 0; y < ymax; y++) |
616 |
picreadline3(y, (rgbpixel *)(ourdata+y*xmax*3)); |
617 |
} |
618 |
|
619 |
|
620 |
scale_rcolors(xr, sf) /* scale color map */ |
621 |
register XRASTER *xr; |
622 |
double sf; |
623 |
{ |
624 |
register int i; |
625 |
long maxv; |
626 |
|
627 |
if (xr->pixels == NULL) |
628 |
return; |
629 |
|
630 |
sf = pow(sf, 1.0/gamcor); |
631 |
maxv = 65535/sf; |
632 |
|
633 |
for (i = xr->ncolors; i--; ) { |
634 |
xr->cdefs[i].red = xr->cdefs[i].red > maxv ? |
635 |
65535 : |
636 |
xr->cdefs[i].red * sf; |
637 |
xr->cdefs[i].green = xr->cdefs[i].green > maxv ? |
638 |
65535 : |
639 |
xr->cdefs[i].green * sf; |
640 |
xr->cdefs[i].blue = xr->cdefs[i].blue > maxv ? |
641 |
65535 : |
642 |
xr->cdefs[i].blue * sf; |
643 |
} |
644 |
XStoreColors(thedisplay, xr->cmap, xr->cdefs, xr->ncolors); |
645 |
} |
646 |
|
647 |
|
648 |
getscan(y) |
649 |
int y; |
650 |
{ |
651 |
if (y != cury) { |
652 |
if (scanpos == NULL || scanpos[y] == -1) |
653 |
return(-1); |
654 |
if (fseek(fin, scanpos[y], 0) == -1) |
655 |
quit("fseek error"); |
656 |
cury = y; |
657 |
} else if (scanpos != NULL) |
658 |
scanpos[y] = ftell(fin); |
659 |
|
660 |
if (freadcolrs(scanline, xmax, fin) < 0) |
661 |
quiterr("read error"); |
662 |
|
663 |
cury++; |
664 |
return(0); |
665 |
} |
666 |
|
667 |
|
668 |
picreadline3(y, l3) /* read in 3-byte scanline */ |
669 |
int y; |
670 |
register rgbpixel *l3; |
671 |
{ |
672 |
register int i; |
673 |
/* read scanline */ |
674 |
if (getscan(y) < 0) |
675 |
quiterr("cannot seek for picreadline"); |
676 |
/* convert scanline */ |
677 |
normcolrs(scanline, xmax, scale); |
678 |
for (i = 0; i < xmax; i++) { |
679 |
l3[i].r = scanline[i][RED]; |
680 |
l3[i].g = scanline[i][GRN]; |
681 |
l3[i].b = scanline[i][BLU]; |
682 |
} |
683 |
} |
684 |
|
685 |
|
686 |
picwriteline(y, l) /* add 8-bit scanline to image */ |
687 |
int y; |
688 |
pixel *l; |
689 |
{ |
690 |
bcopy((char *)l, (char *)ourdata+y*xmax, xmax); |
691 |
} |
692 |
|
693 |
|
694 |
picreadcm(map) /* do gamma correction */ |
695 |
colormap map; |
696 |
{ |
697 |
extern double pow(); |
698 |
register int i, val; |
699 |
|
700 |
for (i = 0; i < 256; i++) { |
701 |
val = pow(i/256.0, 1.0/gamcor) * 256.0; |
702 |
map[0][i] = map[1][i] = map[2][i] = val; |
703 |
} |
704 |
} |
705 |
|
706 |
|
707 |
picwritecm(map) /* handled elsewhere */ |
708 |
colormap map; |
709 |
{ |
710 |
#ifdef DEBUG |
711 |
register int i; |
712 |
|
713 |
for (i = 0; i < 256; i++) |
714 |
printf("%d %d %d\n", map[0][i],map[1][i],map[2][i]); |
715 |
#endif |
716 |
} |