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 |
19 |
*/ |
20 |
|
21 |
|
22 |
#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 |
#define revline(x0,y0,x1,y1) XDrawLine(thedisplay,wind,revgc,x0,y0,x1,y1) |
47 |
|
48 |
#define redraw(x,y,w,h) patch_raster(wind,(x)-xoff,(y)-yoff,x,y,w,h,ourras) |
49 |
|
50 |
double gamcor = 2.2; /* gamma correction */ |
51 |
|
52 |
int dither = 1; /* dither colors? */ |
53 |
int fast = 0; /* keep picture in Pixmap? */ |
54 |
|
55 |
Window wind = 0; /* our output window */ |
56 |
Font fontid; /* our font */ |
57 |
|
58 |
int maxcolors = 0; /* maximum colors */ |
59 |
int greyscale = 0; /* in grey */ |
60 |
|
61 |
int scale = 0; /* scalefactor; power of two */ |
62 |
|
63 |
int xoff = 0; /* x image offset */ |
64 |
int yoff = 0; /* y image offset */ |
65 |
|
66 |
VIEW ourview = STDVIEW; /* image view parameters */ |
67 |
int gotview = 0; /* got parameters from file */ |
68 |
|
69 |
COLR *scanline; /* scan line buffer */ |
70 |
|
71 |
int xmax, ymax; /* picture resolution */ |
72 |
int width, height; /* window size */ |
73 |
char *fname = NULL; /* input file name */ |
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FILE *fin = stdin; /* input file */ |
75 |
long *scanpos = NULL; /* scan line positions in file */ |
76 |
int cury = 0; /* current scan location */ |
77 |
|
78 |
double exposure = 1.0; /* exposure compensation used */ |
79 |
|
80 |
GC revgc; /* graphics context with GXinvert */ |
81 |
|
82 |
XRASTER *ourras; /* our stored image */ |
83 |
unsigned char *ourdata; /* our image data */ |
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|
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struct { |
86 |
int xmin, ymin, xsiz, ysiz; |
87 |
} box = {0, 0, 0, 0}; /* current box */ |
88 |
|
89 |
char *geometry = NULL; /* geometry specification */ |
90 |
|
91 |
char *progname; |
92 |
|
93 |
char errmsg[128]; |
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|
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extern long ftell(); |
96 |
|
97 |
extern char *malloc(), *calloc(); |
98 |
|
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extern double atof(), pow(), log(); |
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|
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Display *thedisplay; |
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|
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main(argc, argv) |
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int argc; |
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char *argv[]; |
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{ |
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int headline(); |
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int i; |
109 |
|
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progname = argv[0]; |
111 |
|
112 |
for (i = 1; i < argc; i++) |
113 |
if (argv[i][0] == '-') |
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switch (argv[i][1]) { |
115 |
case 'c': |
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maxcolors = atoi(argv[++i]); |
117 |
break; |
118 |
case 'b': |
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greyscale = !greyscale; |
120 |
break; |
121 |
case 'm': |
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maxcolors = 2; |
123 |
break; |
124 |
case 'd': |
125 |
dither = !dither; |
126 |
break; |
127 |
case 'f': |
128 |
fast = !fast; |
129 |
break; |
130 |
case 'e': |
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if (argv[i+1][0] != '+' && argv[i+1][0] != '-') |
132 |
goto userr; |
133 |
scale = atoi(argv[++i]); |
134 |
break; |
135 |
case 'g': |
136 |
if (!strcmp(argv[i], "-geometry")) |
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geometry = argv[++i]; |
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else |
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gamcor = atof(argv[++i]); |
140 |
break; |
141 |
default: |
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goto userr; |
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} |
144 |
else if (argv[i][0] == '=') |
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geometry = argv[i]; |
146 |
else |
147 |
break; |
148 |
|
149 |
if (i == argc-1) { |
150 |
fname = argv[i]; |
151 |
fin = fopen(fname, "r"); |
152 |
if (fin == NULL) { |
153 |
sprintf(errmsg, "can't open file \"%s\"", fname); |
154 |
quiterr(errmsg); |
155 |
} |
156 |
} else if (i != argc) |
157 |
goto userr; |
158 |
/* get header */ |
159 |
getheader(fin, headline); |
160 |
/* get picture dimensions */ |
161 |
if (fgetresolu(&xmax, &ymax, fin) != (YMAJOR|YDECR)) |
162 |
quiterr("bad picture size"); |
163 |
/* set view parameters */ |
164 |
if (gotview && setview(&ourview) != NULL) |
165 |
gotview = 0; |
166 |
if ((scanline = (COLR *)malloc(xmax*sizeof(COLR))) == NULL) |
167 |
quiterr("out of memory"); |
168 |
|
169 |
init(); /* get file and open window */ |
170 |
|
171 |
for ( ; ; ) |
172 |
getevent(); /* main loop */ |
173 |
userr: |
174 |
fprintf(stderr, |
175 |
"Usage: %s [-geometry spec][-b][-m][-d][-f][-c ncolors][-e +/-stops] file\n", |
176 |
progname); |
177 |
quit(1); |
178 |
} |
179 |
|
180 |
|
181 |
headline(s) /* get relevant info from header */ |
182 |
char *s; |
183 |
{ |
184 |
static char *altname[] = {"rview","rpict","pinterp",VIEWSTR,NULL}; |
185 |
register char **an; |
186 |
|
187 |
if (isexpos(s)) |
188 |
exposure *= exposval(s); |
189 |
else |
190 |
for (an = altname; *an != NULL; an++) |
191 |
if (!strncmp(*an, s, strlen(*an))) { |
192 |
if (sscanview(&ourview, s+strlen(*an)) > 0) |
193 |
gotview++; |
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return; |
195 |
} |
196 |
} |
197 |
|
198 |
|
199 |
init() /* get data and open window */ |
200 |
{ |
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XSetWindowAttributes ourwinattr; |
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XSizeHints oursizhints; |
203 |
register int i; |
204 |
|
205 |
if (fname != NULL) { |
206 |
scanpos = (long *)malloc(ymax*sizeof(long)); |
207 |
if (scanpos == NULL) |
208 |
goto memerr; |
209 |
for (i = 0; i < ymax; i++) |
210 |
scanpos[i] = -1; |
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} |
212 |
if ((thedisplay = XOpenDisplay(NULL)) == NULL) |
213 |
quiterr("can't open display; DISPLAY variable set?"); |
214 |
if (maxcolors == 0) { /* get number of available colors */ |
215 |
i = DisplayPlanes(thedisplay,ourscreen); |
216 |
maxcolors = i > 8 ? 256 : 1<<i; |
217 |
if (maxcolors > 4) maxcolors -= 2; |
218 |
} |
219 |
/* store image */ |
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getras(); |
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/* open window */ |
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ourwinattr.border_pixel = ourblack; |
223 |
ourwinattr.background_pixel = ourwhite; |
224 |
wind = XCreateWindow(thedisplay, ourroot, 0, 0, xmax, ymax, BORWIDTH, |
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0, InputOutput, ourras->visual, |
226 |
CWBackPixel|CWBorderPixel, &ourwinattr); |
227 |
if (wind == 0) |
228 |
quiterr("can't create window"); |
229 |
width = xmax; |
230 |
height = ymax; |
231 |
fontid = XLoadFont(thedisplay, FONTNAME); |
232 |
if (fontid == 0) |
233 |
quiterr("can't get font"); |
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XSetFont(thedisplay, ourgc, fontid); |
235 |
revgc = XCreateGC(thedisplay, wind, 0, 0); |
236 |
XSetFunction(thedisplay, revgc, GXinvert); |
237 |
XStoreName(thedisplay, wind, fname == NULL ? progname : fname); |
238 |
XDefineCursor(thedisplay, wind, XCreateFontCursor(thedisplay, |
239 |
XC_diamond_cross)); |
240 |
if (geometry != NULL) { |
241 |
bzero((char *)&oursizhints, sizeof(oursizhints)); |
242 |
i = XParseGeometry(geometry, &oursizhints.x, &oursizhints.y, |
243 |
&oursizhints.width, &oursizhints.height); |
244 |
if ((i&(WidthValue|HeightValue)) == (WidthValue|HeightValue)) |
245 |
oursizhints.flags |= USSize; |
246 |
else { |
247 |
oursizhints.width = xmax; |
248 |
oursizhints.height = ymax; |
249 |
oursizhints.flags |= PSize; |
250 |
} |
251 |
if ((i&(XValue|YValue)) == (XValue|YValue)) { |
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oursizhints.flags |= USPosition; |
253 |
if (i & XNegative) |
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oursizhints.x += DisplayWidth(thedisplay, |
255 |
ourscreen)-1-oursizhints.width-2*BORWIDTH; |
256 |
if (i & YNegative) |
257 |
oursizhints.y += DisplayHeight(thedisplay, |
258 |
ourscreen)-1-oursizhints.height-2*BORWIDTH; |
259 |
} |
260 |
XSetNormalHints(thedisplay, wind, &oursizhints); |
261 |
} |
262 |
XSelectInput(thedisplay, wind, ButtonPressMask|ButtonReleaseMask |
263 |
|ButtonMotionMask|StructureNotifyMask |
264 |
|KeyPressMask|ExposureMask); |
265 |
XMapWindow(thedisplay, wind); |
266 |
return; |
267 |
memerr: |
268 |
quiterr("out of memory"); |
269 |
} /* end of init */ |
270 |
|
271 |
|
272 |
quiterr(err) /* print message and exit */ |
273 |
char *err; |
274 |
{ |
275 |
if (err != NULL) { |
276 |
fprintf(stderr, "%s: %s\n", progname, err); |
277 |
exit(1); |
278 |
} |
279 |
exit(0); |
280 |
} |
281 |
|
282 |
|
283 |
eputs(s) |
284 |
char *s; |
285 |
{ |
286 |
fputs(s, stderr); |
287 |
} |
288 |
|
289 |
|
290 |
quit(code) |
291 |
int code; |
292 |
{ |
293 |
exit(code); |
294 |
} |
295 |
|
296 |
|
297 |
getras() /* get raster file */ |
298 |
{ |
299 |
colormap ourmap; |
300 |
XVisualInfo vinfo; |
301 |
|
302 |
if (maxcolors <= 2) { /* monochrome */ |
303 |
ourdata = (unsigned char *)malloc(ymax*((xmax+7)/8)); |
304 |
if (ourdata == NULL) |
305 |
goto fail; |
306 |
ourras = make_raster(thedisplay, ourscreen, 1, ourdata, |
307 |
xmax, ymax, 8); |
308 |
if (ourras == NULL) |
309 |
goto fail; |
310 |
getmono(); |
311 |
} else if (XMatchVisualInfo(thedisplay,ourscreen,24,TrueColor,&vinfo) |
312 |
/* kludge for DirectColor */ |
313 |
|| XMatchVisualInfo(thedisplay,ourscreen,24,DirectColor,&vinfo)) { |
314 |
ourdata = (unsigned char *)malloc(xmax*ymax*3); |
315 |
if (ourdata == NULL) |
316 |
goto fail; |
317 |
ourras = make_raster(thedisplay, ourscreen, 24, ourdata, |
318 |
xmax, ymax, 8); |
319 |
if (ourras == NULL) |
320 |
goto fail; |
321 |
getfull(); |
322 |
} else { |
323 |
ourdata = (unsigned char *)malloc(xmax*ymax); |
324 |
if (ourdata == NULL) |
325 |
goto fail; |
326 |
ourras = make_raster(thedisplay, ourscreen, 8, ourdata, |
327 |
xmax, ymax, 8); |
328 |
if (ourras == NULL) |
329 |
goto fail; |
330 |
if (greyscale) |
331 |
biq(dither,maxcolors,1,ourmap); |
332 |
else |
333 |
ciq(dither,maxcolors,1,ourmap); |
334 |
if (init_rcolors(ourras, ourmap[0], ourmap[1], ourmap[2]) == 0) |
335 |
goto fail; |
336 |
} |
337 |
return; |
338 |
fail: |
339 |
quit("could not create raster image"); |
340 |
} |
341 |
|
342 |
|
343 |
getevent() /* process the next event */ |
344 |
{ |
345 |
union { |
346 |
XEvent u; |
347 |
XConfigureEvent c; |
348 |
XExposeEvent e; |
349 |
XButtonPressedEvent b; |
350 |
XKeyPressedEvent k; |
351 |
} e; |
352 |
|
353 |
XNextEvent(thedisplay, &e.u); |
354 |
switch (e.u.type) { |
355 |
case KeyPress: |
356 |
docom(&e.k); |
357 |
break; |
358 |
case ConfigureNotify: |
359 |
width = e.c.width; |
360 |
height = e.c.height; |
361 |
break; |
362 |
case MapNotify: |
363 |
map_rcolors(ourras, wind); |
364 |
if (fast) |
365 |
make_rpixmap(ourras); |
366 |
break; |
367 |
case UnmapNotify: |
368 |
unmap_rcolors(ourras); |
369 |
break; |
370 |
case Expose: |
371 |
redraw(e.e.x, e.e.y, e.e.width, e.e.height); |
372 |
break; |
373 |
case ButtonPress: |
374 |
if (e.b.state & (ShiftMask|ControlMask)) |
375 |
moveimage(&e.b); |
376 |
else |
377 |
getbox(&e.b); |
378 |
break; |
379 |
} |
380 |
} |
381 |
|
382 |
|
383 |
docom(ekey) /* execute command */ |
384 |
XKeyPressedEvent *ekey; |
385 |
{ |
386 |
char buf[80]; |
387 |
COLOR cval; |
388 |
XColor cvx; |
389 |
int com, n; |
390 |
double comp; |
391 |
FVECT rorg, rdir; |
392 |
|
393 |
n = XLookupString(ekey, buf, sizeof(buf), NULL, NULL); |
394 |
if (n == 0) |
395 |
return(0); |
396 |
com = buf[0]; |
397 |
switch (com) { /* interpret command */ |
398 |
case 'q': |
399 |
case CTRL(D): /* quit */ |
400 |
quit(0); |
401 |
case '\n': |
402 |
case '\r': |
403 |
case 'l': |
404 |
case 'c': /* value */ |
405 |
if (avgbox(cval) == -1) |
406 |
return(-1); |
407 |
switch (com) { |
408 |
case '\n': |
409 |
case '\r': /* radiance */ |
410 |
sprintf(buf, "%.3f", intens(cval)/exposure); |
411 |
break; |
412 |
case 'l': /* luminance */ |
413 |
sprintf(buf, "%.0fn", bright(cval)*683.0/exposure); |
414 |
break; |
415 |
case 'c': /* color */ |
416 |
comp = pow(2.0, (double)scale); |
417 |
sprintf(buf, "(%.2f,%.2f,%.2f)", |
418 |
colval(cval,RED)*comp, |
419 |
colval(cval,GRN)*comp, |
420 |
colval(cval,BLU)*comp); |
421 |
break; |
422 |
} |
423 |
XDrawImageString(thedisplay, wind, ourgc, |
424 |
box.xmin, box.ymin+box.ysiz, buf, strlen(buf)); |
425 |
return(0); |
426 |
case 'i': /* identify (contour) */ |
427 |
if (ourras->pixels == NULL) |
428 |
return(-1); |
429 |
n = ourdata[ekey->x-xoff+xmax*(ekey->y-yoff)]; |
430 |
n = ourras->pmap[n]; |
431 |
cvx.pixel = ourras->cdefs[n].pixel; |
432 |
cvx.red = random() & 65535; |
433 |
cvx.green = random() & 65535; |
434 |
cvx.blue = random() & 65535; |
435 |
cvx.flags = DoRed|DoGreen|DoBlue; |
436 |
XStoreColor(thedisplay, ourras->cmap, &cvx); |
437 |
return(0); |
438 |
case 'p': /* position */ |
439 |
sprintf(buf, "(%d,%d)", ekey->x-xoff, ymax-1-ekey->y+yoff); |
440 |
XDrawImageString(thedisplay, wind, ourgc, ekey->x, ekey->y, |
441 |
buf, strlen(buf)); |
442 |
return(0); |
443 |
case 't': /* trace */ |
444 |
if (!gotview) { |
445 |
XBell(thedisplay, 0); |
446 |
return(-1); |
447 |
} |
448 |
viewray(rorg, rdir, &ourview, |
449 |
(ekey->x-xoff+.5)/xmax, |
450 |
(ymax-1-ekey->y+yoff+.5)/ymax); |
451 |
printf("%e %e %e ", rorg[0], rorg[1], rorg[2]); |
452 |
printf("%e %e %e\n", rdir[0], rdir[1], rdir[2]); |
453 |
fflush(stdout); |
454 |
return(0); |
455 |
case '=': /* adjust exposure */ |
456 |
if (avgbox(cval) == -1) |
457 |
return(-1); |
458 |
n = log(.5/bright(cval))/.69315 - scale; /* truncate */ |
459 |
if (n == 0) |
460 |
return(0); |
461 |
scale_rcolors(ourras, pow(2.0, (double)n)); |
462 |
scale += n; |
463 |
sprintf(buf, "%+d", scale); |
464 |
XDrawImageString(thedisplay, wind, ourgc, |
465 |
box.xmin, box.ymin+box.ysiz, buf, strlen(buf)); |
466 |
XFlush(thedisplay); |
467 |
free(ourdata); |
468 |
free_raster(ourras); |
469 |
getras(); |
470 |
/* fall through */ |
471 |
case CTRL(R): /* redraw */ |
472 |
case CTRL(L): |
473 |
unmap_rcolors(ourras); |
474 |
XClearWindow(thedisplay, wind); |
475 |
map_rcolors(ourras, wind); |
476 |
if (fast) |
477 |
make_rpixmap(ourras); |
478 |
redraw(0, 0, width, height); |
479 |
return(0); |
480 |
case ' ': /* clear */ |
481 |
redraw(box.xmin, box.ymin, box.xsiz, box.ysiz); |
482 |
return(0); |
483 |
default: |
484 |
XBell(thedisplay, 0); |
485 |
return(-1); |
486 |
} |
487 |
} |
488 |
|
489 |
|
490 |
moveimage(ebut) /* shift the image */ |
491 |
XButtonPressedEvent *ebut; |
492 |
{ |
493 |
union { |
494 |
XEvent u; |
495 |
XButtonReleasedEvent b; |
496 |
XPointerMovedEvent m; |
497 |
} e; |
498 |
int mxo, myo; |
499 |
|
500 |
XMaskEvent(thedisplay, ButtonReleaseMask|ButtonMotionMask, &e.u); |
501 |
while (e.u.type == MotionNotify) { |
502 |
mxo = e.m.x; |
503 |
myo = e.m.y; |
504 |
revline(ebut->x, ebut->y, mxo, myo); |
505 |
revbox(xoff+mxo-ebut->x, yoff+myo-ebut->y, |
506 |
xoff+mxo-ebut->x+xmax, yoff+myo-ebut->y+ymax); |
507 |
XMaskEvent(thedisplay,ButtonReleaseMask|ButtonMotionMask,&e.u); |
508 |
revline(ebut->x, ebut->y, mxo, myo); |
509 |
revbox(xoff+mxo-ebut->x, yoff+myo-ebut->y, |
510 |
xoff+mxo-ebut->x+xmax, yoff+myo-ebut->y+ymax); |
511 |
} |
512 |
xoff += e.b.x - ebut->x; |
513 |
yoff += e.b.y - ebut->y; |
514 |
XClearWindow(thedisplay, wind); |
515 |
redraw(0, 0, width, height); |
516 |
} |
517 |
|
518 |
|
519 |
getbox(ebut) /* get new box */ |
520 |
XButtonPressedEvent *ebut; |
521 |
{ |
522 |
union { |
523 |
XEvent u; |
524 |
XButtonReleasedEvent b; |
525 |
XPointerMovedEvent m; |
526 |
} e; |
527 |
|
528 |
XMaskEvent(thedisplay, ButtonReleaseMask|ButtonMotionMask, &e.u); |
529 |
while (e.u.type == MotionNotify) { |
530 |
revbox(ebut->x, ebut->y, box.xmin = e.m.x, box.ymin = e.m.y); |
531 |
XMaskEvent(thedisplay,ButtonReleaseMask|ButtonMotionMask,&e.u); |
532 |
revbox(ebut->x, ebut->y, box.xmin, box.ymin); |
533 |
} |
534 |
box.xmin = e.b.x<0 ? 0 : (e.b.x>=width ? width-1 : e.b.x); |
535 |
box.ymin = e.b.y<0 ? 0 : (e.b.y>=height ? height-1 : e.b.y); |
536 |
if (box.xmin > ebut->x) { |
537 |
box.xsiz = box.xmin - ebut->x + 1; |
538 |
box.xmin = ebut->x; |
539 |
} else { |
540 |
box.xsiz = ebut->x - box.xmin + 1; |
541 |
} |
542 |
if (box.ymin > ebut->y) { |
543 |
box.ysiz = box.ymin - ebut->y + 1; |
544 |
box.ymin = ebut->y; |
545 |
} else { |
546 |
box.ysiz = ebut->y - box.ymin + 1; |
547 |
} |
548 |
} |
549 |
|
550 |
|
551 |
revbox(x0, y0, x1, y1) /* draw box with reversed lines */ |
552 |
int x0, y0, x1, y1; |
553 |
{ |
554 |
revline(x0, y0, x1, y0); |
555 |
revline(x0, y1, x1, y1); |
556 |
revline(x0, y0, x0, y1); |
557 |
revline(x1, y0, x1, y1); |
558 |
} |
559 |
|
560 |
|
561 |
avgbox(clr) /* average color over current box */ |
562 |
COLOR clr; |
563 |
{ |
564 |
int left, right, top, bottom; |
565 |
int y; |
566 |
double d; |
567 |
COLOR ctmp; |
568 |
register int x; |
569 |
|
570 |
setcolor(clr, 0.0, 0.0, 0.0); |
571 |
left = box.xmin - xoff; |
572 |
right = left + box.xsiz; |
573 |
if (left < 0) |
574 |
left = 0; |
575 |
if (right > xmax) |
576 |
right = xmax; |
577 |
if (left >= right) |
578 |
return(-1); |
579 |
top = box.ymin - yoff; |
580 |
bottom = top + box.ysiz; |
581 |
if (top < 0) |
582 |
top = 0; |
583 |
if (bottom > ymax) |
584 |
bottom = ymax; |
585 |
if (top >= bottom) |
586 |
return(-1); |
587 |
for (y = top; y < bottom; y++) { |
588 |
if (getscan(y) == -1) |
589 |
return(-1); |
590 |
for (x = left; x < right; x++) { |
591 |
colr_color(ctmp, scanline[x]); |
592 |
addcolor(clr, ctmp); |
593 |
} |
594 |
} |
595 |
d = 1.0/((right-left)*(bottom-top)); |
596 |
scalecolor(clr, d); |
597 |
return(0); |
598 |
} |
599 |
|
600 |
|
601 |
getmono() /* get monochrome data */ |
602 |
{ |
603 |
register unsigned char *dp; |
604 |
register int x, err; |
605 |
int y; |
606 |
rgbpixel *inl; |
607 |
short *cerr; |
608 |
|
609 |
if ((inl = (rgbpixel *)malloc(xmax*sizeof(rgbpixel))) == NULL |
610 |
|| (cerr = (short *)calloc(xmax,sizeof(short))) == NULL) |
611 |
quit("out of memory in getmono"); |
612 |
dp = ourdata - 1; |
613 |
for (y = 0; y < ymax; y++) { |
614 |
picreadline3(y, inl); |
615 |
err = 0; |
616 |
for (x = 0; x < xmax; x++) { |
617 |
if (!(x&7)) |
618 |
*++dp = 0; |
619 |
err += rgb_bright(&inl[x]) + cerr[x]; |
620 |
if (err > 127) |
621 |
err -= 255; |
622 |
else |
623 |
*dp |= 1<<(7-(x&07)); |
624 |
cerr[x] = err >>= 1; |
625 |
} |
626 |
} |
627 |
free((char *)inl); |
628 |
free((char *)cerr); |
629 |
} |
630 |
|
631 |
|
632 |
getfull() /* get full (24-bit) data */ |
633 |
{ |
634 |
int y; |
635 |
|
636 |
for (y = 0; y < ymax; y++) |
637 |
picreadline3(y, (rgbpixel *)(ourdata+y*xmax*3)); |
638 |
} |
639 |
|
640 |
|
641 |
scale_rcolors(xr, sf) /* scale color map */ |
642 |
register XRASTER *xr; |
643 |
double sf; |
644 |
{ |
645 |
register int i; |
646 |
long maxv; |
647 |
|
648 |
if (xr->pixels == NULL) |
649 |
return; |
650 |
|
651 |
sf = pow(sf, 1.0/gamcor); |
652 |
maxv = 65535/sf; |
653 |
|
654 |
for (i = xr->ncolors; i--; ) { |
655 |
xr->cdefs[i].red = xr->cdefs[i].red > maxv ? |
656 |
65535 : |
657 |
xr->cdefs[i].red * sf; |
658 |
xr->cdefs[i].green = xr->cdefs[i].green > maxv ? |
659 |
65535 : |
660 |
xr->cdefs[i].green * sf; |
661 |
xr->cdefs[i].blue = xr->cdefs[i].blue > maxv ? |
662 |
65535 : |
663 |
xr->cdefs[i].blue * sf; |
664 |
} |
665 |
XStoreColors(thedisplay, xr->cmap, xr->cdefs, xr->ncolors); |
666 |
} |
667 |
|
668 |
|
669 |
getscan(y) |
670 |
int y; |
671 |
{ |
672 |
if (y != cury) { |
673 |
if (scanpos == NULL || scanpos[y] == -1) |
674 |
return(-1); |
675 |
if (fseek(fin, scanpos[y], 0) == -1) |
676 |
quit("fseek error"); |
677 |
cury = y; |
678 |
} else if (scanpos != NULL) |
679 |
scanpos[y] = ftell(fin); |
680 |
|
681 |
if (freadcolrs(scanline, xmax, fin) < 0) |
682 |
quiterr("read error"); |
683 |
|
684 |
cury++; |
685 |
return(0); |
686 |
} |
687 |
|
688 |
|
689 |
picreadline3(y, l3) /* read in 3-byte scanline */ |
690 |
int y; |
691 |
register rgbpixel *l3; |
692 |
{ |
693 |
register int i; |
694 |
/* read scanline */ |
695 |
if (getscan(y) < 0) |
696 |
quiterr("cannot seek for picreadline"); |
697 |
/* convert scanline */ |
698 |
normcolrs(scanline, xmax, scale); |
699 |
for (i = 0; i < xmax; i++) { |
700 |
l3[i].r = scanline[i][RED]; |
701 |
l3[i].g = scanline[i][GRN]; |
702 |
l3[i].b = scanline[i][BLU]; |
703 |
} |
704 |
} |
705 |
|
706 |
|
707 |
picwriteline(y, l) /* add 8-bit scanline to image */ |
708 |
int y; |
709 |
pixel *l; |
710 |
{ |
711 |
bcopy((char *)l, (char *)ourdata+y*xmax, xmax); |
712 |
} |
713 |
|
714 |
|
715 |
picreadcm(map) /* do gamma correction */ |
716 |
colormap map; |
717 |
{ |
718 |
extern double pow(); |
719 |
register int i, val; |
720 |
|
721 |
for (i = 0; i < 256; i++) { |
722 |
val = pow(i/256.0, 1.0/gamcor) * 256.0; |
723 |
map[0][i] = map[1][i] = map[2][i] = val; |
724 |
} |
725 |
} |
726 |
|
727 |
|
728 |
picwritecm(map) /* handled elsewhere */ |
729 |
colormap map; |
730 |
{ |
731 |
#ifdef DEBUG |
732 |
register int i; |
733 |
|
734 |
for (i = 0; i < 256; i++) |
735 |
printf("%d %d %d\n", map[0][i],map[1][i],map[2][i]); |
736 |
#endif |
737 |
} |