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Date:: Fri Sep 9 23:49:50 2005 UTC
Message:: Add uchar for NetBSD ctype.
Actions:: History | Blame | Raw File
1 /*
2  * Some of the stuff in this file is not X-dependent and should be elsewhere.
3  */
4 #include <u.h>
5 #include "x11-inc.h"
6 #include <libc.h>
7 #include <draw.h>
8 #include <memdraw.h>
9 #include <keyboard.h>
10 #include <mouse.h>
11 #include <cursor.h>
12 #include "x11-memdraw.h"
13 
14 char *winsize;
15 static int parsewinsize(char*, Rectangle*, int*);
16 
17 static Memimage	*xattach(char*);
18 static void	plan9cmap(void);
19 static int	setupcmap(XWindow);
20 static int	xreplacescreenimage(void);
21 static XGC	xgc(XDrawable, int, int);
22 static Image	*getimage0(Display*, Image*);
23 
24 Xprivate _x;
25 
26 Display*
27 _initdisplay(void (*error)(Display*, char*), char *label)
28 {
29 	Display *d;
30 	Memimage *m;
31 
32 	/*
33 	 * This rfork(RFNOTEG) isn't exactly right,
34 	 * but we need some way to signal window 
35 	 * closes.  Right now we post a hangup
36 	 * note to the note group, which kills a whole
37 	 * lot more than just the current program
38 	 * if we don't do this.
39 	 */
40 	/*
41 	 * Actually, I don't know what I changed but
42 	 * this appears not to be necessary anymore.
43 	 * I'll regret this probably.
44 	rfork(RFNOTEG);
45 	*/
46 	memimageinit();
47 
48 	d = mallocz(sizeof(Display), 1);
49 	if(d == nil)
50 		return nil;
51 
52 	d->buf = malloc(16000+5);
53 	d->obuf = malloc(16000);
54 	if(d->buf == nil || d->obuf == nil){
55 		free(d->buf);
56 		free(d->obuf);
57 		free(d);
58 		return nil;
59 	}
60 	d->bufsize = 16000;
61 	d->obufsize = 16000;
62 	d->bufp = d->buf;
63 	d->obufp = d->obuf;
64 
65 	m = xattach(label);
66 	if(m == nil){
67 		free(d);
68 		return nil;
69 	}
70 
71 	d->error = error;
72 	_initdisplaymemimage(d, m);
73 	d->image = getimage0(d, 0);
74 	
75 	return d;
76 }
77 
78 static Image*
79 getimage0(Display *d, Image *image)
80 {
81 	char info[12*12+1];
82 	uchar *a;
83 	int n;
84 	extern int _freeimage1(Image*);
85 
86 	/*
87 	 * If there's an old screen, it has id 0.  The 'J' request below
88 	 * will try to install the new screen as id 0, so the old one 
89 	 * must be freed first.
90 	 */
91 	if(image){
92 		_freeimage1(image);
93 		memset(image, 0, sizeof(Image));
94 	}
95 
96 	a = bufimage(d, 2);
97 	a[0] = 'J';
98 	a[1] = 'I';
99 	if(flushimage(d, 0) < 0){
100 		fprint(2, "cannot read screen info: %r\n");
101 		abort();
102 	}
103 
104 	n = _drawmsgread(d, info, sizeof info);
105 	if(n != 12*12){
106 		fprint(2, "short screen info\n");
107 		abort();
108 	}
109 
110 	if(image == nil){
111 		image = mallocz(sizeof(Image), 1);
112 		if(image == nil){
113 			fprint(2, "cannot allocate image: %r\n");
114 			abort();
115 		}
116 	}
117 
118 	image->display = d;
119 	image->id = 0;
120 	image->chan = strtochan(info+2*12);
121 	image->depth = chantodepth(image->chan);
122 	image->repl = atoi(info+3*12);
123 	image->r.min.x = atoi(info+4*12);
124 	image->r.min.y = atoi(info+5*12);
125 	image->r.max.x = atoi(info+6*12);
126 	image->r.max.y = atoi(info+7*12);
127 	image->clipr.min.x = atoi(info+8*12);
128 	image->clipr.min.y = atoi(info+9*12);
129 	image->clipr.max.x = atoi(info+10*12);
130 	image->clipr.max.y = atoi(info+11*12);
131 	return image;
132 }
133 
134 int
135 getwindow(Display *d, int ref)
136 {
137 	Image *i;
138 	Image *oi;
139 
140 	if(_x.destroyed)
141 		postnote(PNGROUP, getpgrp(), "hangup");
142 	if(xreplacescreenimage() == 0)
143 		return 0;
144 
145 	/*
146 	 * Libdraw promises not to change the value of "screen",
147 	 * so we have to reuse the image structure
148 	 * memory we already have.
149 	 */
150 	oi = d->image;
151 	i = getimage0(d, oi);
152 	d->image = i;
153 	// fprint(2, "getwindow %p -> %p\n", oi, i);
154 
155 	_screen = allocscreen(i, d->white, 0);
156 	_freeimage1(screen);
157 	screen = _allocwindow(screen, _screen, i->r, ref, DWhite);
158 	d->screenimage = screen;
159 	return 0;
160 }
161 
162 static int
163 xerror(XDisplay *d, XErrorEvent *e)
164 {
165 	char buf[200];
166 
167 	if(e->request_code == 42) /* XSetInputFocus */
168 		return 0;
169 	if(e->request_code == 18) /* XChangeProperty */
170 		return 0;
171 
172 	print("X error: error_code=%d, request_code=%d, minor=%d disp=%p\n",
173 		e->error_code, e->request_code, e->minor_code, d);
174 	XGetErrorText(d, e->error_code, buf, sizeof buf);
175 	print("%s\n", buf);
176 	return 0;
177 }
178 
179 static int
180 xioerror(XDisplay *d)
181 {
182 	//print("X I/O error\n");
183 	sysfatal("X I/O error\n");
184 	abort();
185 	return -1;
186 }
187 
188 
189 static Memimage*
190 xattach(char *label)
191 {
192 	char *argv[2], *disp;
193 	int i, havemin, height, mask, n, width, x, xrootid, y;
194 	Rectangle r;
195 	XClassHint classhint;
196 	XDrawable pmid;
197 	XPixmapFormatValues *pfmt;
198 	XScreen *xscreen;
199 	XSetWindowAttributes attr;
200 	XSizeHints normalhint;
201 	XTextProperty name;
202 	XVisualInfo xvi;
203 	XWindow xrootwin;
204 	XWindowAttributes wattr;
205 	XWMHints hint;
206 	Atom atoms[2];
207 
208 	/*
209 	if(XInitThreads() == 0){
210 		fprint(2, "XInitThreads failed\n");
211 		abort();
212 	}
213 	*/
214 
215 	/*
216 	 * Connect to X server.
217 	 */
218 	_x.display = XOpenDisplay(NULL);
219 	if(_x.display == nil){
220 		disp = getenv("DISPLAY");
221 		werrstr("XOpenDisplay %s: %r", disp ? disp : ":0");
222 		free(disp);
223 		return nil;
224 	}
225 	XSetErrorHandler(xerror);
226 	XSetIOErrorHandler(xioerror);
227 	xrootid = DefaultScreen(_x.display);
228 	xrootwin = DefaultRootWindow(_x.display);
229 
230 	/* 
231 	 * Figure out underlying screen format.
232 	 */
233 	if(XMatchVisualInfo(_x.display, xrootid, 16, TrueColor, &xvi)
234 	|| XMatchVisualInfo(_x.display, xrootid, 16, DirectColor, &xvi)){
235 		_x.vis = xvi.visual;
236 		_x.depth = 16;
237 	}
238 	else
239 	if(XMatchVisualInfo(_x.display, xrootid, 15, TrueColor, &xvi)
240 	|| XMatchVisualInfo(_x.display, xrootid, 15, DirectColor, &xvi)){
241 		_x.vis = xvi.visual;
242 		_x.depth = 15;
243 	}
244 	else
245 	if(XMatchVisualInfo(_x.display, xrootid, 24, TrueColor, &xvi)
246 	|| XMatchVisualInfo(_x.display, xrootid, 24, DirectColor, &xvi)){
247 		_x.vis = xvi.visual;
248 		_x.depth = 24;
249 	}
250 	else
251 	if(XMatchVisualInfo(_x.display, xrootid, 8, PseudoColor, &xvi)
252 	|| XMatchVisualInfo(_x.display, xrootid, 8, StaticColor, &xvi)){
253 		if(_x.depth > 8){
254 			werrstr("can't deal with colormapped depth %d screens",
255 				_x.depth);
256 			goto err0;
257 		}
258 		_x.vis = xvi.visual;
259 		_x.depth = 8;
260 	}
261 	else{
262 		_x.depth = DefaultDepth(_x.display, xrootid);
263 		if(_x.depth != 8){
264 			werrstr("can't understand depth %d screen", _x.depth);
265 			goto err0;
266 		}
267 		_x.vis = DefaultVisual(_x.display, xrootid);
268 	}
269 
270 	if(DefaultDepth(_x.display, xrootid) == _x.depth)
271 		_x.usetable = 1;
272 
273 	/*
274 	 * _x.depth is only the number of significant pixel bits,
275 	 * not the total number of pixel bits.  We need to walk the
276 	 * display list to find how many actual bits are used
277 	 * per pixel.
278 	 */
279 	_x.chan = 0;
280 	pfmt = XListPixmapFormats(_x.display, &n);
281 	for(i=0; i<n; i++){
282 		if(pfmt[i].depth == _x.depth){
283 			switch(pfmt[i].bits_per_pixel){
284 			case 1:	/* untested */
285 				_x.chan = GREY1;
286 				break;
287 			case 2:	/* untested */
288 				_x.chan = GREY2;
289 				break;
290 			case 4:	/* untested */
291 				_x.chan = GREY4;
292 				break;
293 			case 8:
294 				_x.chan = CMAP8;
295 				break;
296 			case 15:
297 				_x.chan = RGB15;
298 				break;
299 			case 16: /* how to tell RGB15? */
300 				_x.chan = RGB16;
301 				break;
302 			case 24: /* untested (impossible?) */
303 				_x.chan = RGB24;
304 				break;
305 			case 32:
306 				_x.chan = XRGB32;
307 				break;
308 			}
309 		}
310 	}
311 	if(_x.chan == 0){
312 		werrstr("could not determine screen pixel format");
313 		goto err0;
314 	}
315 
316 	/*
317 	 * Set up color map if necessary.
318 	 */
319 	xscreen = DefaultScreenOfDisplay(_x.display);
320 	_x.cmap = DefaultColormapOfScreen(xscreen);
321 	if(_x.vis->class != StaticColor){
322 		plan9cmap();
323 		setupcmap(xrootwin);
324 	}
325 
326 	/*
327 	 * We get to choose the initial rectangle size.
328 	 * This is arbitrary.  In theory we should read the
329 	 * command line and allow the traditional X options.
330 	 */
331 	mask = 0;
332 	x = 0;
333 	y = 0;
334 	if(winsize){
335 		if(parsewinsize(winsize, &r, &havemin) < 0)
336 			sysfatal("%r");
337 	}else{
338 		/*
339 		 * Parse the various X resources.  Thanks to Peter Canning.
340 		 */
341 		char *screen_resources, *display_resources, *geom, 
342 			*geomrestype, *home, *file;
343 		XrmDatabase database;
344 		XrmValue geomres;
345 
346 		database = XrmGetDatabase(_x.display);
347 		screen_resources = XScreenResourceString(xscreen);
348 		if(screen_resources != nil){
349 			XrmCombineDatabase(XrmGetStringDatabase(screen_resources), &database, False);
350 			XFree(screen_resources);
351 		}
352 
353 		display_resources = XResourceManagerString(_x.display);
354 		if(display_resources == nil){
355 			home = getenv("HOME");
356 			if(home!=nil && (file=smprint("%s/.Xdefaults", home)) != nil){
357 				XrmCombineFileDatabase(file, &database, False);
358 				free(file);
359 			}
360 			free(home);
361 		}else
362 			XrmCombineDatabase(XrmGetStringDatabase(display_resources), &database, False);
363 
364 		geom = smprint("%s.geometry", label);
365 		if(geom && XrmGetResource(database, geom, nil, &geomrestype, &geomres))
366 			mask = XParseGeometry(geomres.addr, &x, &y, (uint*)&width, (uint*)&height);
367 		free(geom);
368 
369 		if((mask & WidthValue) && (mask & HeightValue)){
370 			r = Rect(0, 0, width, height);
371 		}else{
372 			r = Rect(0, 0, WidthOfScreen(xscreen)*3/4,
373 					HeightOfScreen(xscreen)*3/4);
374 			if(Dx(r) > Dy(r)*3/2)
375 				r.max.x = r.min.x + Dy(r)*3/2;
376 			if(Dy(r) > Dx(r)*3/2)
377 				r.max.y = r.min.y + Dx(r)*3/2;
378 		}
379 		if(mask & XNegative){
380 			x += WidthOfScreen(xscreen);
381 		}
382 		if(mask & YNegative){
383 			y += HeightOfScreen(xscreen);
384 		}
385 		havemin = 0;
386 	}
387 
388 	memset(&attr, 0, sizeof attr);
389 	attr.colormap = _x.cmap;
390 	attr.background_pixel = ~0;
391 	attr.border_pixel = 0;
392 	_x.drawable = XCreateWindow(
393 		_x.display,	/* display */
394 		xrootwin,	/* parent */
395 		x,		/* x */
396 		y,		/* y */
397 		Dx(r),		/* width */
398 	 	Dy(r),		/* height */
399 		0,		/* border width */
400 		_x.depth,	/* depth */
401 		InputOutput,	/* class */
402 		_x.vis,		/* visual */
403 				/* valuemask */
404 		CWBackPixel|CWBorderPixel|CWColormap,
405 		&attr		/* attributes (the above aren't?!) */
406 	);
407 
408 	/*
409 	 * Label and other properties required by ICCCCM.
410 	 */
411 	memset(&name, 0, sizeof name);
412 	if(label == nil)
413 		label = "pjw-face-here";
414 	name.value = (uchar*)label;
415 	name.encoding = XA_STRING;
416 	name.format = 8;
417 	name.nitems = strlen((char*)name.value);
418 
419 	memset(&normalhint, 0, sizeof normalhint);
420 	normalhint.flags = PSize|PMaxSize;
421 	if(winsize){
422 		normalhint.flags &= ~PSize;
423 		normalhint.flags |= USSize;
424 		normalhint.width = Dx(r);
425 		normalhint.height = Dy(r);
426 	}else{
427 		if((mask & WidthValue) && (mask & HeightValue)){
428 			normalhint.flags &= ~PSize;
429 			normalhint.flags |= USSize;
430 			normalhint.width = width;
431 			normalhint.height = height;
432 		}
433 		if((mask & WidthValue) && (mask & HeightValue)){
434 			normalhint.flags |= USPosition;
435 			normalhint.x = x;
436 			normalhint.y = y;
437 		}
438 	}
439 
440 	normalhint.max_width = WidthOfScreen(xscreen);
441 	normalhint.max_height = HeightOfScreen(xscreen);
442 
443 	memset(&hint, 0, sizeof hint);
444 	hint.flags = InputHint|StateHint;
445 	hint.input = 1;
446 	hint.initial_state = NormalState;
447 
448 	memset(&classhint, 0, sizeof classhint);
449 	classhint.res_name = label;
450 	classhint.res_class = label;
451 
452 	argv[0] = label;
453 	argv[1] = nil;
454 
455 	XSetWMProperties(
456 		_x.display,	/* display */
457 		_x.drawable,	/* window */
458 		&name,		/* XA_WM_NAME property */
459 		&name,		/* XA_WM_ICON_NAME property */
460 		argv,		/* XA_WM_COMMAND */
461 		1,		/* argc */
462 		&normalhint,	/* XA_WM_NORMAL_HINTS */
463 		&hint,		/* XA_WM_HINTS */
464 		&classhint	/* XA_WM_CLASSHINTS */
465 	);
466 	XFlush(_x.display);
467 
468 	if(havemin){
469 		XWindowChanges ch;
470 
471 		memset(&ch, 0, sizeof ch);
472 		ch.x = r.min.x;
473 		ch.y = r.min.y;
474 		XConfigureWindow(_x.display, _x.drawable, CWX|CWY, &ch);
475 		/*
476 		 * Must pretend origin is 0,0 for X.
477 		 */
478 		r = Rect(0,0,Dx(r),Dy(r));
479 	}
480 	/*
481 	 * Look up clipboard atom.
482 	 */
483 	_x.clipboard = XInternAtom(_x.display, "CLIPBOARD", False);
484 	_x.utf8string = XInternAtom(_x.display, "UTF8_STRING", False);
485 	_x.targets = XInternAtom(_x.display, "TARGETS", False);
486 	_x.text = XInternAtom(_x.display, "TEXT", False);
487 	_x.compoundtext = XInternAtom(_x.display, "COMPOUND_TEXT", False);
488 	_x.takefocus = XInternAtom(_x.display, "WM_TAKE_FOCUS", False);
489 	_x.losefocus = XInternAtom(_x.display, "_9WM_LOSE_FOCUS", False);
490 	_x.wmprotos = XInternAtom(_x.display, "WM_PROTOCOLS", False);
491 
492 	atoms[0] = _x.takefocus;
493 	atoms[1] = _x.losefocus;
494 	XChangeProperty(_x.display, _x.drawable, _x.wmprotos, XA_ATOM, 32,
495 		PropModeReplace, (uchar*)atoms, 2);
496 
497 	/*
498 	 * Put the window on the screen, check to see what size we actually got.
499 	 */
500 	XMapWindow(_x.display, _x.drawable);
501 	XSync(_x.display, False);
502 
503 	if(!XGetWindowAttributes(_x.display, _x.drawable, &wattr))
504 		fprint(2, "XGetWindowAttributes failed\n");
505 	else if(wattr.width && wattr.height){
506 		if(wattr.width != Dx(r) || wattr.height != Dy(r)){
507 			r.max.x = wattr.width;
508 			r.max.y = wattr.height;
509 		}
510 	}else
511 		fprint(2, "XGetWindowAttributes: bad attrs\n");
512 
513 	/*
514 	 * Allocate our local backing store.
515 	 */
516 	_x.screenr = r;
517 	_x.screenpm = XCreatePixmap(_x.display, _x.drawable, Dx(r), Dy(r), _x.depth);
518 	_x.nextscreenpm = _x.screenpm;
519 	_x.screenimage = _xallocmemimage(r, _x.chan, _x.screenpm);
520 
521 	/*
522 	 * Allocate some useful graphics contexts for the future.
523 	 */
524 	_x.gcfill	= xgc(_x.screenpm, FillSolid, -1);
525 	_x.gccopy	= xgc(_x.screenpm, -1, -1);
526 	_x.gcsimplesrc 	= xgc(_x.screenpm, FillStippled, -1);
527 	_x.gczero	= xgc(_x.screenpm, -1, -1);
528 	_x.gcreplsrc	= xgc(_x.screenpm, FillTiled, -1);
529 
530 	pmid = XCreatePixmap(_x.display, _x.drawable, 1, 1, 1);
531 	_x.gcfill0	= xgc(pmid, FillSolid, 0);
532 	_x.gccopy0	= xgc(pmid, -1, -1);
533 	_x.gcsimplesrc0	= xgc(pmid, FillStippled, -1);
534 	_x.gczero0	= xgc(pmid, -1, -1);
535 	_x.gcreplsrc0	= xgc(pmid, FillTiled, -1);
536 	XFreePixmap(_x.display, pmid);
537 
538 	/*
539 	 * Lots of display connections for various procs.
540 	 */
541 	_x.kbdcon	= XOpenDisplay(NULL);
542 	_x.mousecon	= XOpenDisplay(NULL);
543 	_x.snarfcon	= XOpenDisplay(NULL);
544 
545 	if(0) fprint(2, "x: display=%p kbd=%p mouse=%p snarf=%p\n",
546 		_x.display, _x.kbdcon, _x.mousecon, _x.snarfcon);
547 
548 	return _x.screenimage;
549 
550 err0:
551 fprint(2, "%r\n");
552 	/*
553 	 * Should do a better job of cleaning up here.
554 	 */
555 	XCloseDisplay(_x.display);
556 	return nil;
557 }
558 
559 int
560 drawsetlabel(char *label)
561 {
562 	XTextProperty name;
563 
564 	/*
565 	 * Label and other properties required by ICCCCM.
566 	 */
567 	memset(&name, 0, sizeof name);
568 	if(label == nil)
569 		label = "pjw-face-here";
570 	name.value = (uchar*)label;
571 	name.encoding = XA_STRING;
572 	name.format = 8;
573 	name.nitems = strlen((char*)name.value);
574 
575 	XSetWMProperties(
576 		_x.display,	/* display */
577 		_x.drawable,	/* window */
578 		&name,		/* XA_WM_NAME property */
579 		&name,		/* XA_WM_ICON_NAME property */
580 		nil,		/* XA_WM_COMMAND */
581 		0,		/* argc */
582 		nil,		/* XA_WM_NORMAL_HINTS */
583 		nil,		/* XA_WM_HINTS */
584 		nil	/* XA_WM_CLASSHINTS */
585 	);
586 	XFlush(_x.display);
587 	return 0;
588 }
589 
590 /*
591  * Create a GC with a particular fill style and XXX.
592  * Disable generation of GraphicsExpose/NoExpose events in the GC.
593  */
594 static XGC
595 xgc(XDrawable d, int fillstyle, int foreground)
596 {
597 	XGC gc;
598 	XGCValues v;
599 
600 	memset(&v, 0, sizeof v);
601 	v.function = GXcopy;
602 	v.graphics_exposures = False;
603 	gc = XCreateGC(_x.display, d, GCFunction|GCGraphicsExposures, &v);
604 	if(fillstyle != -1)
605 		XSetFillStyle(_x.display, gc, fillstyle);
606 	if(foreground != -1)
607 		XSetForeground(_x.display, gc, 0);
608 	return gc;
609 }
610 
611 
612 /*
613  * Initialize map with the Plan 9 rgbv color map.
614  */
615 static void
616 plan9cmap(void)
617 {
618 	int r, g, b, cr, cg, cb, v, num, den, idx, v7, idx7;
619 	static int once;
620 
621 	if(once)
622 		return;
623 	once = 1;
624 
625 	for(r=0; r!=4; r++)
626 	for(g = 0; g != 4; g++)
627 	for(b = 0; b!=4; b++)
628 	for(v = 0; v!=4; v++){
629 		den=r;
630 		if(g > den)
631 			den=g;
632 		if(b > den)
633 			den=b;
634 		/* divide check -- pick grey shades */
635 		if(den==0)
636 			cr=cg=cb=v*17;
637 		else {
638 			num=17*(4*den+v);
639 			cr=r*num/den;
640 			cg=g*num/den;
641 			cb=b*num/den;
642 		}
643 		idx = r*64 + v*16 + ((g*4 + b + v - r) & 15);
644 		_x.map[idx].red = cr*0x0101;
645 		_x.map[idx].green = cg*0x0101;
646 		_x.map[idx].blue = cb*0x0101;
647 		_x.map[idx].pixel = idx;
648 		_x.map[idx].flags = DoRed|DoGreen|DoBlue;
649 
650 		v7 = v >> 1;
651 		idx7 = r*32 + v7*16 + g*4 + b;
652 		if((v & 1) == v7){
653 			_x.map7to8[idx7][0] = idx;
654 			if(den == 0) { 		/* divide check -- pick grey shades */
655 				cr = ((255.0/7.0)*v7)+0.5;
656 				cg = cr;
657 				cb = cr;
658 			}
659 			else {
660 				num=17*15*(4*den+v7*2)/14;
661 				cr=r*num/den;
662 				cg=g*num/den;
663 				cb=b*num/den;
664 			}
665 			_x.map7[idx7].red = cr*0x0101;
666 			_x.map7[idx7].green = cg*0x0101;
667 			_x.map7[idx7].blue = cb*0x0101;
668 			_x.map7[idx7].pixel = idx7;
669 			_x.map7[idx7].flags = DoRed|DoGreen|DoBlue;
670 		}
671 		else
672 			_x.map7to8[idx7][1] = idx;
673 	}
674 }
675 
676 /*
677  * Initialize and install the rgbv color map as a private color map
678  * for this application.  It gets the best colors when it has the
679  * cursor focus.
680  *
681  * We always choose the best depth possible, but that might not
682  * be the default depth.  On such "suboptimal" systems, we have to allocate an
683  * empty color map anyway, according to Axel Belinfante.
684  */
685 static int 
686 setupcmap(XWindow w)
687 {
688 	char buf[30];
689 	int i;
690 	u32int p, pp;
691 	XColor c;
692 
693 	if(_x.depth <= 1)
694 		return 0;
695 
696 	if(_x.depth >= 24) {
697 		if(_x.usetable == 0)
698 			_x.cmap = XCreateColormap(_x.display, w, _x.vis, AllocNone); 
699 
700 		/*
701 		 * The pixel value returned from XGetPixel needs to
702 		 * be converted to RGB so we can call rgb2cmap()
703 		 * to translate between 24 bit X and our color. Unfortunately,
704 		 * the return value appears to be display server endian 
705 		 * dependant. Therefore, we run some heuristics to later
706 		 * determine how to mask the int value correctly.
707 		 * Yeah, I know we can look at _x.vis->byte_order but 
708 		 * some displays say MSB even though they run on LSB.
709 		 * Besides, this is more anal.
710 		 */
711 		c = _x.map[19];	/* known to have different R, G, B values */
712 		if(!XAllocColor(_x.display, _x.cmap, &c)){
713 			werrstr("XAllocColor: %r");
714 			return -1;
715 		}
716 		p  = c.pixel;
717 		pp = rgb2cmap((p>>16)&0xff,(p>>8)&0xff,p&0xff);
718 		if(pp != _x.map[19].pixel) {
719 			/* check if endian is other way */
720 			pp = rgb2cmap(p&0xff,(p>>8)&0xff,(p>>16)&0xff);
721 			if(pp != _x.map[19].pixel){
722 				werrstr("cannot detect X server byte order");
723 				return -1;
724 			}
725 
726 			switch(_x.chan){
727 			case RGB24:
728 				_x.chan = BGR24;
729 				break;
730 			case XRGB32:
731 				_x.chan = XBGR32;
732 				break;
733 			default:
734 				werrstr("cannot byteswap channel %s",
735 					chantostr(buf, _x.chan));
736 				break;
737 			}
738 		}
739 	}else if(_x.vis->class == TrueColor || _x.vis->class == DirectColor){
740 		/*
741 		 * Do nothing.  We have no way to express a
742 		 * mixed-endian 16-bit screen, so pretend they don't exist.
743 		 */
744 		if(_x.usetable == 0)
745 			_x.cmap = XCreateColormap(_x.display, w, _x.vis, AllocNone);
746 	}else if(_x.vis->class == PseudoColor){
747 		if(_x.usetable == 0){
748 			_x.cmap = XCreateColormap(_x.display, w, _x.vis, AllocAll); 
749 			XStoreColors(_x.display, _x.cmap, _x.map, 256);
750 			for(i = 0; i < 256; i++){
751 				_x.tox11[i] = i;
752 				_x.toplan9[i] = i;
753 			}
754 		}else{
755 			for(i = 0; i < 128; i++){
756 				c = _x.map7[i];
757 				if(!XAllocColor(_x.display, _x.cmap, &c)){
758 					werrstr("can't allocate colors in 7-bit map");
759 					return -1;
760 				}
761 				_x.tox11[_x.map7to8[i][0]] = c.pixel;
762 				_x.tox11[_x.map7to8[i][1]] = c.pixel;
763 				_x.toplan9[c.pixel] = _x.map7to8[i][0];
764 			}
765 		}
766 	}else{
767 		werrstr("unsupported visual class %d", _x.vis->class);
768 		return -1;
769 	}
770 	return 0;
771 }
772 
773 void
774 _flushmemscreen(Rectangle r)
775 {
776 	if(_x.nextscreenpm != _x.screenpm){
777 		qlock(&_x.screenlock);
778 		XSync(_x.display, False);
779 		XFreePixmap(_x.display, _x.screenpm);
780 		_x.screenpm = _x.nextscreenpm;
781 		qunlock(&_x.screenlock);
782 	}
783 
784 	if(r.min.x >= r.max.x || r.min.y >= r.max.y)
785 		return;
786 	XCopyArea(_x.display, _x.screenpm, _x.drawable, _x.gccopy, r.min.x, r.min.y,
787 		Dx(r), Dy(r), r.min.x, r.min.y);
788 	XFlush(_x.display);
789 }
790 
791 void
792 _xexpose(XEvent *e, XDisplay *xd)
793 {
794 	XExposeEvent *xe;
795 	Rectangle r;
796 
797 	qlock(&_x.screenlock);
798 	if(_x.screenpm != _x.nextscreenpm){
799 		qunlock(&_x.screenlock);
800 		return;
801 	}
802 	xe = (XExposeEvent*)e;
803 	r.min.x = xe->x;
804 	r.min.y = xe->y;
805 	r.max.x = xe->x+xe->width;
806 	r.max.y = xe->y+xe->height;
807 	XCopyArea(xd, _x.screenpm, _x.drawable, _x.gccopy, r.min.x, r.min.y,
808 		Dx(r), Dy(r), r.min.x, r.min.y);
809 	XSync(xd, False);
810 	qunlock(&_x.screenlock);
811 }
812 
813 int
814 _xdestroy(XEvent *e, XDisplay *xd)
815 {
816 	XDestroyWindowEvent *xe;
817 
818 	xe = (XDestroyWindowEvent*)e;
819 	if(xe->window == _x.drawable){
820 		_x.destroyed = 1;
821 		return 1;
822 	}
823 	return 0;
824 }
825 
826 int
827 _xconfigure(XEvent *e, XDisplay *xd)
828 {
829 	Rectangle r;
830 	XConfigureEvent *xe = (XConfigureEvent*)e;
831 
832 	if(xe->width == Dx(_x.screenr) && xe->height == Dy(_x.screenr))
833 		return 0;
834 	if(xe->width==0 || xe->height==0)
835 		fprint(2, "ignoring resize to %dx%d\n", xe->width, xe->height);
836 	r = Rect(0, 0, xe->width, xe->height);
837 	qlock(&_x.screenlock);
838 	if(_x.screenpm != _x.nextscreenpm){
839 		XCopyArea(xd, _x.screenpm, _x.drawable, _x.gccopy, r.min.x, r.min.y,
840 			Dx(r), Dy(r), r.min.x, r.min.y);
841 		XSync(xd, False);
842 	}
843 	qunlock(&_x.screenlock);
844 	_x.newscreenr = r;
845 	return 1;
846 }
847 
848 static int
849 xreplacescreenimage(void)
850 {
851 	Memimage *m;
852 	XDrawable pixmap;
853 	Rectangle r;
854 
855 	r = _x.newscreenr;
856 	if(eqrect(_x.screenr, r))
857 		return 0;
858 
859 	pixmap = XCreatePixmap(_x.display, _x.drawable, Dx(r), Dy(r), _x.depth);
860 	m = _xallocmemimage(r, _x.chan, pixmap);
861 	if(_x.nextscreenpm != _x.screenpm)
862 		XFreePixmap(_x.display, _x.nextscreenpm);
863 	_x.nextscreenpm = pixmap;
864 	_x.screenr = r;
865 	_drawreplacescreenimage(m);
866 	return 1;
867 }
868 
869 static int
870 parsewinsize(char *s, Rectangle *r, int *havemin)
871 {
872 	char c, *os;
873 	int i, j, k, l;
874 
875 	os = s;
876 	*havemin = 0;
877 	*r = Rect(0,0,0,0);
878 	if(!isdigit((uchar)*s))
879 		goto oops;
880 	i = strtol(s, &s, 0);
881 	if(*s == 'x'){
882 		s++;
883 		if(!isdigit((uchar)*s))
884 			goto oops;
885 		j = strtol(s, &s, 0);
886 		r->max.x = i;
887 		r->max.y = j;
888 		if(*s == 0)
889 			return 0;
890 		if(*s != '@')
891 			goto oops;
892 
893 		s++;
894 		if(!isdigit((uchar)*s))
895 			goto oops;
896 		i = strtol(s, &s, 0);
897 		if(*s != ',' && *s != ' ')
898 			goto oops;
899 		s++;
900 		if(!isdigit((uchar)*s))
901 			goto oops;
902 		j = strtol(s, &s, 0);
903 		if(*s != 0)
904 			goto oops;
905 		*r = rectaddpt(*r, Pt(i,j));
906 		*havemin = 1;
907 		return 0;
908 	}
909 
910 	c = *s;
911 	if(c != ' ' && c != ',')
912 		goto oops;
913 	s++;
914 	if(!isdigit((uchar)*s))
915 		goto oops;
916 	j = strtol(s, &s, 0);
917 	if(*s != c)
918 		goto oops;
919 	s++;
920 	if(!isdigit((uchar)*s))
921 		goto oops;
922 	k = strtol(s, &s, 0);
923 	if(*s != c)
924 		goto oops;
925 	s++;
926 	if(!isdigit((uchar)*s))
927 		goto oops;
928 	l = strtol(s, &s, 0);
929 	if(*s != 0)
930 		goto oops;
931 	*r = Rect(i,j,k,l);
932 	*havemin = 1;
933 	return 0;
934 
935 oops:
936 	werrstr("bad syntax in window size '%s'", os);
937 	return -1;
938 }