1 |
/* Copyright (c) 1987 Regents of the University of California */ |
2 |
|
3 |
#ifndef lint |
4 |
static char SCCSid[] = "$SunId$ LBL"; |
5 |
#endif |
6 |
|
7 |
/* |
8 |
* ximage.c - driver for X-windows |
9 |
* |
10 |
* 4/30/87 |
11 |
* 3/3/88 Added calls to xraster & Paul Heckbert's ciq routines |
12 |
*/ |
13 |
|
14 |
#include "standard.h" |
15 |
|
16 |
#include <X/Xlib.h> |
17 |
#include <X/cursors/bcross.cursor> |
18 |
#include <X/cursors/bcross_mask.cursor> |
19 |
|
20 |
#include <sys/types.h> |
21 |
|
22 |
#include <ctype.h> |
23 |
|
24 |
#include "color.h" |
25 |
|
26 |
#include "xraster.h" |
27 |
|
28 |
#include "view.h" |
29 |
|
30 |
#include "pic.h" |
31 |
|
32 |
#define controlshift(e) (((XButtonEvent *)(e))->detail & (ShiftMask|ControlMask)) |
33 |
|
34 |
#define FONTNAME "9x15" /* text font we'll use */ |
35 |
|
36 |
#define CTRL(c) ('c'-'@') |
37 |
|
38 |
#define BORWIDTH 5 /* border width */ |
39 |
#define BARHEIGHT 25 /* menu bar size */ |
40 |
|
41 |
double gamcor = 2.0; /* gamma correction */ |
42 |
|
43 |
XRASTER *ourras = NULL; /* our stored raster image */ |
44 |
|
45 |
int dither = 1; /* dither colors? */ |
46 |
int fast = 0; /* keep picture in Pixmap? */ |
47 |
|
48 |
Window wind = 0; /* our output window */ |
49 |
Font fontid; /* our font */ |
50 |
|
51 |
int maxcolors = 0; /* maximum colors */ |
52 |
int greyscale = 0; /* in grey */ |
53 |
|
54 |
int scale = 0; /* scalefactor; power of two */ |
55 |
|
56 |
int xoff = 0; /* x image offset */ |
57 |
int yoff = 0; /* y image offset */ |
58 |
|
59 |
VIEW ourview = STDVIEW(0); /* image view parameters */ |
60 |
int gotview = 0; /* got parameters from file */ |
61 |
|
62 |
COLR *scanline; /* scan line buffer */ |
63 |
|
64 |
int xmax, ymax; /* picture resolution */ |
65 |
int width, height; /* window size */ |
66 |
char *fname = NULL; /* input file name */ |
67 |
FILE *fin = stdin; /* input file */ |
68 |
long *scanpos = NULL; /* scan line positions in file */ |
69 |
int cury = 0; /* current scan location */ |
70 |
|
71 |
double exposure = 1.0; /* exposure compensation used */ |
72 |
|
73 |
struct { |
74 |
int xmin, ymin, xsiz, ysiz; |
75 |
} box = {0, 0, 0, 0}; /* current box */ |
76 |
|
77 |
char *geometry = NULL; /* geometry specification */ |
78 |
|
79 |
char *progname; |
80 |
|
81 |
char errmsg[128]; |
82 |
|
83 |
extern long ftell(); |
84 |
|
85 |
extern char *malloc(), *calloc(); |
86 |
|
87 |
extern double atof(), pow(), log(); |
88 |
|
89 |
|
90 |
main(argc, argv) |
91 |
int argc; |
92 |
char *argv[]; |
93 |
{ |
94 |
int headline(); |
95 |
int i; |
96 |
|
97 |
progname = argv[0]; |
98 |
|
99 |
for (i = 1; i < argc; i++) |
100 |
if (argv[i][0] == '-') |
101 |
switch (argv[i][1]) { |
102 |
case 'c': |
103 |
maxcolors = atoi(argv[++i]); |
104 |
break; |
105 |
case 'b': |
106 |
greyscale = !greyscale; |
107 |
break; |
108 |
case 'm': |
109 |
maxcolors = 2; |
110 |
break; |
111 |
case 'd': |
112 |
dither = !dither; |
113 |
break; |
114 |
case 'f': |
115 |
fast = !fast; |
116 |
break; |
117 |
case 'e': |
118 |
if (argv[i+1][0] != '+' && argv[i+1][0] != '-') |
119 |
goto userr; |
120 |
scale = atoi(argv[++i]); |
121 |
break; |
122 |
case 'g': |
123 |
gamcor = atof(argv[++i]); |
124 |
break; |
125 |
default: |
126 |
goto userr; |
127 |
} |
128 |
else if (argv[i][0] == '=') |
129 |
geometry = argv[i]; |
130 |
else |
131 |
break; |
132 |
|
133 |
if (argc-i == 1) { |
134 |
fname = argv[i]; |
135 |
fin = fopen(fname, "r"); |
136 |
if (fin == NULL) { |
137 |
sprintf(errmsg, "can't open file \"%s\"", fname); |
138 |
quiterr(errmsg); |
139 |
} |
140 |
} else |
141 |
goto userr; |
142 |
|
143 |
/* get header */ |
144 |
getheader(fin, headline); |
145 |
/* get picture dimensions */ |
146 |
if (fscanf(fin, "-Y %d +X %d\n", &ymax, &xmax) != 2) |
147 |
quiterr("bad picture size"); |
148 |
/* set view parameters */ |
149 |
if (gotview) { |
150 |
ourview.hresolu = xmax; |
151 |
ourview.vresolu = ymax; |
152 |
if (setview(&ourview) != NULL) |
153 |
gotview = 0; |
154 |
} |
155 |
if ((scanline = (COLR *)malloc(xmax*sizeof(COLR))) == NULL) |
156 |
quiterr("out of memory"); |
157 |
|
158 |
init(); /* get file and open window */ |
159 |
|
160 |
for ( ; ; ) |
161 |
getevent(); /* main loop */ |
162 |
userr: |
163 |
fprintf(stderr, |
164 |
"Usage: %s [=geometry][-b][-m][-d][-f][-c ncolors][-e +/-stops] file\n", |
165 |
progname); |
166 |
quit(1); |
167 |
} |
168 |
|
169 |
|
170 |
headline(s) /* get relevant info from header */ |
171 |
char *s; |
172 |
{ |
173 |
static char *altname[] = {"rview","rpict","VIEW=",NULL}; |
174 |
register char **an; |
175 |
|
176 |
if (!strncmp(s, "EXPOSURE=", 9)) |
177 |
exposure *= atof(s+9); |
178 |
else |
179 |
for (an = altname; *an != NULL; an++) |
180 |
if (!strncmp(*an, s, strlen(*an))) { |
181 |
if (sscanview(&ourview, s+strlen(*an)) == 0) |
182 |
gotview++; |
183 |
return; |
184 |
} |
185 |
} |
186 |
|
187 |
|
188 |
char * |
189 |
sskip(s) /* skip a word */ |
190 |
register char *s; |
191 |
{ |
192 |
while (isspace(*s)) s++; |
193 |
while (*s && !isspace(*s)) s++; |
194 |
return(s); |
195 |
} |
196 |
|
197 |
|
198 |
init() /* get data and open window */ |
199 |
{ |
200 |
register int i; |
201 |
OpaqueFrame mainframe; |
202 |
char defgeom[32]; |
203 |
|
204 |
if (fname != NULL) { |
205 |
scanpos = (long *)malloc(ymax*sizeof(long)); |
206 |
if (scanpos == NULL) |
207 |
goto memerr; |
208 |
for (i = 0; i < ymax; i++) |
209 |
scanpos[i] = -1; |
210 |
} |
211 |
if (XOpenDisplay(NULL) == NULL) |
212 |
quiterr("can't open display; DISPLAY variable set?"); |
213 |
#ifdef notdef |
214 |
if (DisplayWidth() - 2*BORWIDTH < xmax || |
215 |
DisplayHeight() - 2*BORWIDTH - BARHEIGHT < ymax) |
216 |
quiterr("resolution mismatch"); |
217 |
#endif |
218 |
if (maxcolors == 0) { /* get number of available colors */ |
219 |
maxcolors = 1<<DisplayPlanes(); |
220 |
if (maxcolors > 4) maxcolors -= 2; |
221 |
} |
222 |
/* store image */ |
223 |
getras(); |
224 |
|
225 |
mainframe.bdrwidth = BORWIDTH; |
226 |
mainframe.border = WhitePixmap; |
227 |
mainframe.background = BlackPixmap; |
228 |
sprintf(defgeom, "=%dx%d+0+22", xmax, ymax); |
229 |
wind = XCreate("Radiance Image", progname, geometry, defgeom, |
230 |
&mainframe, 16, 16); |
231 |
if (wind == 0) |
232 |
quiterr("can't create window"); |
233 |
width = mainframe.width; |
234 |
height = mainframe.height; |
235 |
fontid = XGetFont(FONTNAME); |
236 |
if (fontid == 0) |
237 |
quiterr("can't get font"); |
238 |
XStoreName(wind, fname == NULL ? progname : fname); |
239 |
XDefineCursor(wind, XCreateCursor(bcross_width, bcross_height, |
240 |
bcross_bits, bcross_mask_bits, |
241 |
bcross_x_hot, bcross_y_hot, |
242 |
BlackPixel, WhitePixel, GXcopy)); |
243 |
XSelectInput(wind, ButtonPressed|ButtonReleased|UnmapWindow |
244 |
|RightDownMotion|MiddleDownMotion|LeftDownMotion |
245 |
|KeyPressed|ExposeWindow|ExposeRegion); |
246 |
XMapWindow(wind); |
247 |
return; |
248 |
memerr: |
249 |
quiterr("out of memory"); |
250 |
} |
251 |
|
252 |
|
253 |
quiterr(err) /* print message and exit */ |
254 |
char *err; |
255 |
{ |
256 |
if (err != NULL) |
257 |
fprintf(stderr, "%s: %s\n", progname, err); |
258 |
|
259 |
exit(err == NULL ? 0 : 1); |
260 |
} |
261 |
|
262 |
|
263 |
eputs(s) |
264 |
char *s; |
265 |
{ |
266 |
fputs(s, stderr); |
267 |
} |
268 |
|
269 |
|
270 |
quit(code) |
271 |
int code; |
272 |
{ |
273 |
exit(code); |
274 |
} |
275 |
|
276 |
|
277 |
getras() /* get raster file */ |
278 |
{ |
279 |
colormap ourmap; |
280 |
|
281 |
ourras = (XRASTER *)calloc(1, sizeof(XRASTER)); |
282 |
if (ourras == NULL) |
283 |
goto memerr; |
284 |
ourras->width = xmax; |
285 |
ourras->height = ymax; |
286 |
if (maxcolors <= 2) { /* monochrome */ |
287 |
ourras->data.m = (unsigned short *)malloc(BitmapSize(xmax,ymax)); |
288 |
if (ourras->data.m == NULL) |
289 |
goto memerr; |
290 |
getmono(); |
291 |
} else { |
292 |
ourras->data.bz = (unsigned char *)malloc(BZPixmapSize(xmax,ymax)); |
293 |
if (ourras->data.bz == NULL) |
294 |
goto memerr; |
295 |
if (greyscale) |
296 |
biq(dither,maxcolors,1,ourmap); |
297 |
else |
298 |
ciq(dither,maxcolors,1,ourmap); |
299 |
if (init_rcolors(ourras, ourmap) == 0) |
300 |
goto memerr; |
301 |
} |
302 |
return; |
303 |
memerr: |
304 |
quit("out of memory"); |
305 |
} |
306 |
|
307 |
|
308 |
getevent() /* process the next event */ |
309 |
{ |
310 |
WindowInfo info; |
311 |
XEvent e; |
312 |
|
313 |
XNextEvent(&e); |
314 |
switch (e.type) { |
315 |
case KeyPressed: |
316 |
docom(&e); |
317 |
break; |
318 |
case ExposeWindow: |
319 |
XQueryWindow(wind, &info); /* in case resized */ |
320 |
width = info.width; |
321 |
height = info.height; |
322 |
/* fall through */ |
323 |
case ExposeRegion: |
324 |
fixwindow(&e); |
325 |
break; |
326 |
case UnmapWindow: |
327 |
unmap_rcolors(ourras); |
328 |
break; |
329 |
case ButtonPressed: |
330 |
if (controlshift(&e)) |
331 |
moveimage(&e); |
332 |
else |
333 |
getbox(&e); |
334 |
break; |
335 |
} |
336 |
} |
337 |
|
338 |
|
339 |
fixwindow(eexp) /* fix new or stepped-on window */ |
340 |
XExposeEvent *eexp; |
341 |
{ |
342 |
redraw(eexp->x, eexp->y, eexp->width, eexp->height); |
343 |
} |
344 |
|
345 |
|
346 |
redraw(x, y, w, h) /* redraw section of window */ |
347 |
int x, y; |
348 |
int w, h; |
349 |
{ |
350 |
if (map_rcolors(ourras) == NULL) { |
351 |
fprintf(stderr, "%s: cannot allocate colors\n", progname); |
352 |
return(-1); |
353 |
} |
354 |
if (fast) |
355 |
make_rpixmap(ourras); |
356 |
return(patch_raster(wind,x-xoff,y-yoff,x,y,w,h,ourras) ? 0 : -1); |
357 |
} |
358 |
|
359 |
|
360 |
docom(ekey) /* execute command */ |
361 |
XKeyEvent *ekey; |
362 |
{ |
363 |
char buf[80]; |
364 |
COLOR cval; |
365 |
char *cp; |
366 |
int n; |
367 |
double comp; |
368 |
FVECT rorg, rdir; |
369 |
|
370 |
cp = XLookupMapping(ekey, &n); |
371 |
if (n == 0) |
372 |
return(0); |
373 |
switch (*cp) { /* interpret command */ |
374 |
case 'q': |
375 |
case CTRL(D): /* quiterr */ |
376 |
quit(0); |
377 |
case '\n': |
378 |
case '\r': |
379 |
case 'l': |
380 |
case 'c': /* value */ |
381 |
if (avgbox(cval) == -1) |
382 |
return(-1); |
383 |
switch (*cp) { |
384 |
case '\n': |
385 |
case '\r': /* radiance */ |
386 |
sprintf(buf, "%-3g", intens(cval)/exposure); |
387 |
break; |
388 |
case 'l': /* luminance */ |
389 |
sprintf(buf, "%-3gL", bright(cval)*683.0/exposure); |
390 |
break; |
391 |
case 'c': /* color */ |
392 |
comp = pow(2.0, (double)scale); |
393 |
sprintf(buf, "(%.2f,%.2f,%.2f)", |
394 |
colval(cval,RED)*comp, |
395 |
colval(cval,GRN)*comp, |
396 |
colval(cval,BLU)*comp); |
397 |
break; |
398 |
} |
399 |
XText(wind, box.xmin, box.ymin, buf, strlen(buf), |
400 |
fontid, BlackPixel, WhitePixel); |
401 |
return(0); |
402 |
case 'p': /* position */ |
403 |
sprintf(buf, "(%d,%d)", ekey->x-xoff, ymax-1-ekey->y+yoff); |
404 |
XText(wind, ekey->x, ekey->y, buf, strlen(buf), |
405 |
fontid, BlackPixel, WhitePixel); |
406 |
return(0); |
407 |
case 't': /* trace */ |
408 |
if (!gotview) { |
409 |
XFeep(0); |
410 |
return(-1); |
411 |
} |
412 |
rayview(rorg, rdir, &ourview, |
413 |
ekey->x-xoff + .5, ymax-1-ekey->y+yoff + .5); |
414 |
printf("%e %e %e ", rorg[0], rorg[1], rorg[2]); |
415 |
printf("%e %e %e\n", rdir[0], rdir[1], rdir[2]); |
416 |
fflush(stdout); |
417 |
return(0); |
418 |
case '=': /* adjust exposure */ |
419 |
if (avgbox(cval) == -1) |
420 |
return(-1); |
421 |
n = log(.5/bright(cval))/.69315 - scale; /* truncate */ |
422 |
if (n == 0) { |
423 |
XFeep(0); |
424 |
return(0); |
425 |
} |
426 |
scale_rcolors(ourras, pow(2.0, (double)n)); |
427 |
scale += n; |
428 |
sprintf(buf, "%+d", scale); |
429 |
XText(wind, box.xmin, box.ymin, buf, strlen(buf), |
430 |
fontid, BlackPixel, WhitePixel); |
431 |
XFlush(); |
432 |
free_raster(ourras); |
433 |
getras(); |
434 |
/* fall through */ |
435 |
case CTRL(R): /* redraw */ |
436 |
XClear(wind); |
437 |
return(redraw(0, 0, width, height)); |
438 |
case ' ': /* clear */ |
439 |
return(redraw(box.xmin, box.ymin, box.xsiz, box.ysiz)); |
440 |
default: |
441 |
XFeep(0); |
442 |
return(-1); |
443 |
} |
444 |
} |
445 |
|
446 |
|
447 |
moveimage(ep) /* shift the image */ |
448 |
XButtonEvent *ep; |
449 |
{ |
450 |
XButtonEvent eb; |
451 |
|
452 |
XMaskEvent(ButtonReleased, &eb); |
453 |
xoff += eb.x - ep->x; |
454 |
yoff += eb.y - ep->y; |
455 |
XClear(wind); |
456 |
return(redraw(0, 0, width, height)); |
457 |
} |
458 |
|
459 |
|
460 |
getbox(ebut) /* get new box */ |
461 |
XButtonEvent *ebut; |
462 |
{ |
463 |
union { |
464 |
XEvent e; |
465 |
XButtonEvent b; |
466 |
XMouseMovedEvent m; |
467 |
} e; |
468 |
|
469 |
XMaskEvent(ButtonReleased|MouseMoved, &e.e); |
470 |
while (e.e.type == MouseMoved) { |
471 |
revbox(ebut->x, ebut->y, box.xmin = e.m.x, box.ymin = e.m.y); |
472 |
XMaskEvent(ButtonReleased|MouseMoved, &e.e); |
473 |
revbox(ebut->x, ebut->y, box.xmin, box.ymin); |
474 |
} |
475 |
box.xmin = e.b.x<0 ? 0 : (e.b.x>=width ? width-1 : e.b.x); |
476 |
box.ymin = e.b.y<0 ? 0 : (e.b.y>=height ? height-1 : e.b.y); |
477 |
if (box.xmin > ebut->x) { |
478 |
box.xsiz = box.xmin - ebut->x + 1; |
479 |
box.xmin = ebut->x; |
480 |
} else { |
481 |
box.xsiz = ebut->x - box.xmin + 1; |
482 |
} |
483 |
if (box.ymin > ebut->y) { |
484 |
box.ysiz = box.ymin - ebut->y + 1; |
485 |
box.ymin = ebut->y; |
486 |
} else { |
487 |
box.ysiz = ebut->y - box.ymin + 1; |
488 |
} |
489 |
} |
490 |
|
491 |
|
492 |
revbox(x0, y0, x1, y1) /* draw box with reversed lines */ |
493 |
int x0, y0, x1, y1; |
494 |
{ |
495 |
XLine(wind, x0, y0, x1, y0, 1, 1, 0, GXinvert, AllPlanes); |
496 |
XLine(wind, x0, y1, x1, y1, 1, 1, 0, GXinvert, AllPlanes); |
497 |
XLine(wind, x0, y0, x0, y1, 1, 1, 0, GXinvert, AllPlanes); |
498 |
XLine(wind, x1, y0, x1, y1, 1, 1, 0, GXinvert, AllPlanes); |
499 |
} |
500 |
|
501 |
|
502 |
avgbox(clr) /* average color over current box */ |
503 |
COLOR clr; |
504 |
{ |
505 |
int left, right, top, bottom; |
506 |
int y; |
507 |
double d; |
508 |
COLOR ctmp; |
509 |
register int x; |
510 |
|
511 |
setcolor(clr, 0.0, 0.0, 0.0); |
512 |
left = box.xmin - xoff; |
513 |
right = left + box.xsiz; |
514 |
if (left < 0) |
515 |
left = 0; |
516 |
if (right > xmax) |
517 |
right = xmax; |
518 |
if (left >= right) |
519 |
return(-1); |
520 |
top = box.ymin - yoff; |
521 |
bottom = top + box.ysiz; |
522 |
if (top < 0) |
523 |
top = 0; |
524 |
if (bottom > ymax) |
525 |
bottom = ymax; |
526 |
if (top >= bottom) |
527 |
return(-1); |
528 |
for (y = top; y < bottom; y++) { |
529 |
if (getscan(y) == -1) |
530 |
return(-1); |
531 |
for (x = left; x < right; x++) { |
532 |
colr_color(ctmp, scanline[x]); |
533 |
addcolor(clr, ctmp); |
534 |
} |
535 |
} |
536 |
d = 1.0/((right-left)*(bottom-top)); |
537 |
scalecolor(clr, d); |
538 |
return(0); |
539 |
} |
540 |
|
541 |
|
542 |
getmono() /* get monochrome data */ |
543 |
{ |
544 |
register unsigned short *dp; |
545 |
register int x, err; |
546 |
int y; |
547 |
rgbpixel *inline; |
548 |
short *cerr; |
549 |
|
550 |
if ((inline = (rgbpixel *)malloc(xmax*sizeof(rgbpixel))) == NULL |
551 |
|| (cerr = (short *)calloc(xmax,sizeof(short))) == NULL) |
552 |
quit("out of memory in getmono"); |
553 |
dp = ourras->data.m - 1; |
554 |
for (y = 0; y < ymax; y++) { |
555 |
picreadline3(y, inline); |
556 |
err = 0; |
557 |
for (x = 0; x < xmax; x++) { |
558 |
if (!(x&0xf)) |
559 |
*++dp = 0; |
560 |
err += rgb_bright(&inline[x]) + cerr[x]; |
561 |
if (err > 127) |
562 |
err -= 255; |
563 |
else |
564 |
*dp |= 1<<(x&0xf); |
565 |
cerr[x] = err >>= 1; |
566 |
} |
567 |
} |
568 |
free((char *)inline); |
569 |
free((char *)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((char *)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 |
int maxv; |
610 |
|
611 |
sf = pow(sf, 1.0/gamcor); |
612 |
maxv = (1<<16) / sf; |
613 |
|
614 |
for (i = xr->ncolors; i--; ) { |
615 |
xr->cdefs[i].red = xr->cdefs[i].red >= maxv ? |
616 |
(1<<16)-1 : |
617 |
xr->cdefs[i].red * sf; |
618 |
xr->cdefs[i].green = xr->cdefs[i].green >= maxv ? |
619 |
(1<<16)-1 : |
620 |
xr->cdefs[i].green * sf; |
621 |
xr->cdefs[i].blue = xr->cdefs[i].blue >= maxv ? |
622 |
(1<<16)-1 : |
623 |
xr->cdefs[i].blue * sf; |
624 |
} |
625 |
if (xr->pixels != NULL) |
626 |
XStoreColors(xr->ncolors, xr->cdefs); |
627 |
} |
628 |
|
629 |
|
630 |
getscan(y) |
631 |
int y; |
632 |
{ |
633 |
if (y != cury) { |
634 |
if (scanpos == NULL || scanpos[y] == -1) |
635 |
return(-1); |
636 |
if (fseek(fin, scanpos[y], 0) == -1) |
637 |
quit("fseek error"); |
638 |
cury = y; |
639 |
} else if (scanpos != NULL) |
640 |
scanpos[y] = ftell(fin); |
641 |
|
642 |
if (freadcolrs(scanline, xmax, fin) < 0) |
643 |
quiterr("read error"); |
644 |
|
645 |
cury++; |
646 |
return(0); |
647 |
} |
648 |
|
649 |
|
650 |
picreadline3(y, l3) /* read in 3-byte scanline */ |
651 |
int y; |
652 |
register rgbpixel *l3; |
653 |
{ |
654 |
register BYTE *l4; |
655 |
register int shift, c; |
656 |
int i; |
657 |
|
658 |
if (getscan(y) < 0) |
659 |
quiterr("cannot seek for picreadline"); |
660 |
/* convert scanline */ |
661 |
for (l4=scanline[0], i=xmax; i--; l4+=4, l3++) { |
662 |
shift = l4[EXP] - COLXS + scale; |
663 |
if (shift >= 8) { |
664 |
l3->r = l3->g = l3->b = 255; |
665 |
} else if (shift <= -8) { |
666 |
l3->r = l3->g = l3->b = 0; |
667 |
} else if (shift > 0) { |
668 |
c = l4[RED] << shift; |
669 |
l3->r = c > 255 ? 255 : c; |
670 |
c = l4[GRN] << shift; |
671 |
l3->g = c > 255 ? 255 : c; |
672 |
c = l4[BLU] << shift; |
673 |
l3->b = c > 255 ? 255 : c; |
674 |
} else if (shift < 0) { |
675 |
l3->r = l4[RED] >> -shift; |
676 |
l3->g = l4[GRN] >> -shift; |
677 |
l3->b = l4[BLU] >> -shift; |
678 |
} else { |
679 |
l3->r = l4[RED]; |
680 |
l3->g = l4[GRN]; |
681 |
l3->b = l4[BLU]; |
682 |
} |
683 |
} |
684 |
} |
685 |
|
686 |
|
687 |
picwriteline(y, l) /* add 8-bit scanline to image */ |
688 |
int y; |
689 |
pixel *l; |
690 |
{ |
691 |
bcopy(l, ourras->data.bz+BZPixmapSize(xmax,y), BZPixmapSize(xmax,1)); |
692 |
} |
693 |
|
694 |
|
695 |
picreadcm(map) /* do gamcor correction */ |
696 |
colormap map; |
697 |
{ |
698 |
extern double pow(); |
699 |
register int i, val; |
700 |
|
701 |
for (i = 0; i < 256; i++) { |
702 |
val = pow(i/256.0, 1.0/gamcor) * 256.0; |
703 |
map[0][i] = map[1][i] = map[2][i] = val; |
704 |
} |
705 |
} |
706 |
|
707 |
|
708 |
picwritecm(map) /* handled elsewhere */ |
709 |
colormap map; |
710 |
{ |
711 |
#ifdef DEBUG |
712 |
register int i; |
713 |
|
714 |
for (i = 0; i < 256; i++) |
715 |
printf("%d %d %d\n", map[0][i],map[1][i],map[2][i]); |
716 |
#endif |
717 |
} |