op public repos

Blob

Date:: Fri May 14 23:11:48 2004 UTC
Message:: avoid stupid aspect ratios.
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->screenimage = getimage0(d, 0);
74 	return d;
75 }
76 
77 static Image*
78 getimage0(Display *d, Image *image)
79 {
80 	char info[12*12+1];
81 	uchar *a;
82 	int n;
83 	extern int _freeimage1(Image*);
84 
85 	/*
86 	 * If there's an old screen, it has id 0.  The 'J' request below
87 	 * will try to install the new screen as id 0, so the old one 
88 	 * must be freed first.
89 	 */
90 	if(image){
91 		_freeimage1(image);
92 		memset(image, 0, sizeof(Image));
93 	}
94 
95 	a = bufimage(d, 2);
96 	a[0] = 'J';
97 	a[1] = 'I';
98 	if(flushimage(d, 0) < 0){
99 		fprint(2, "cannot read screen info: %r\n");
100 		abort();
101 	}
102 
103 	n = _drawmsgread(d, info, sizeof info);
104 	if(n != 12*12){
105 		fprint(2, "short screen info\n");
106 		abort();
107 	}
108 
109 	if(image == nil){
110 		image = mallocz(sizeof(Image), 1);
111 		if(image == nil){
112 			fprint(2, "cannot allocate image: %r\n");
113 			abort();
114 		}
115 	}
116 
117 	image->display = d;
118 	image->id = 0;
119 	image->chan = strtochan(info+2*12);
120 	image->depth = chantodepth(image->chan);
121 	image->repl = atoi(info+3*12);
122 	image->r.min.x = atoi(info+4*12);
123 	image->r.min.y = atoi(info+5*12);
124 	image->r.max.x = atoi(info+6*12);
125 	image->r.max.y = atoi(info+7*12);
126 	image->clipr.min.x = atoi(info+8*12);
127 	image->clipr.min.y = atoi(info+9*12);
128 	image->clipr.max.x = atoi(info+10*12);
129 	image->clipr.max.y = atoi(info+11*12);
130 	return image;
131 }
132 
133 int
134 getwindow(Display *d, int ref)
135 {
136 	Image *i;
137 	Image *oi;
138 
139 	if(_x.destroyed)
140 		postnote(PNGROUP, getpgrp(), "hangup");
141 	if(xreplacescreenimage() == 0)
142 		return 0;
143 
144 	/*
145 	 * Libdraw promises not to change the value of "screen",
146 	 * so we have to reuse the image structure
147 	 * memory we already have.
148 	 */
149 	oi = d->screenimage;
150 	i = getimage0(d, oi);
151 	screen = d->screenimage = d->image = i;
152 	// fprint(2, "getwindow %p -> %p\n", oi, i);
153 	return 0;
154 }
155 
156 static int
157 xerror(XDisplay *d, XErrorEvent *e)
158 {
159 	char buf[200];
160 
161 	if(e->request_code == 42) /* XSetInputFocus */
162 		return 0;
163 	if(e->request_code == 18) /* XChangeProperty */
164 		return 0;
165 
166 	print("X error: error_code=%d, request_code=%d, minor=%d disp=%p\n",
167 		e->error_code, e->request_code, e->minor_code, d);
168 	XGetErrorText(d, e->error_code, buf, sizeof buf);
169 	print("%s\n", buf);
170 	return 0;
171 }
172 
173 static int
174 xioerror(XDisplay *d)
175 {
176 	//print("X I/O error\n");
177 	sysfatal("X I/O error\n");
178 	abort();
179 	return -1;
180 }
181 
182 
183 static Memimage*
184 xattach(char *label)
185 {
186 	char *argv[2], *disp;
187 	int i, n, xrootid, havemin;
188 	Rectangle r;
189 	XClassHint classhint;
190 	XDrawable pmid;
191 	XPixmapFormatValues *pfmt;
192 	XScreen *xscreen;
193 	XSetWindowAttributes attr;
194 	XSizeHints normalhint;
195 	XTextProperty name;
196 	XVisualInfo xvi;
197 	XWindow xrootwin;
198 	XWindowAttributes wattr;
199 	XWMHints hint;
200 	Atom atoms[2];
201 
202 	/*
203 	if(XInitThreads() == 0){
204 		fprint(2, "XInitThreads failed\n");
205 		abort();
206 	}
207 	*/
208 
209 	/*
210 	 * Connect to X server.
211 	 */
212 	_x.display = XOpenDisplay(NULL);
213 	if(_x.display == nil){
214 		disp = getenv("DISPLAY");
215 		werrstr("XOpenDisplay %s: %r", disp ? disp : ":0");
216 		free(disp);
217 		return nil;
218 	}
219 	XSetErrorHandler(xerror);
220 	XSetIOErrorHandler(xioerror);
221 	xrootid = DefaultScreen(_x.display);
222 	xrootwin = DefaultRootWindow(_x.display);
223 
224 	/* 
225 	 * Figure out underlying screen format.
226 	 */
227 	if(XMatchVisualInfo(_x.display, xrootid, 16, TrueColor, &xvi)
228 	|| XMatchVisualInfo(_x.display, xrootid, 16, DirectColor, &xvi)){
229 		_x.vis = xvi.visual;
230 		_x.depth = 16;
231 	}
232 	else
233 	if(XMatchVisualInfo(_x.display, xrootid, 15, TrueColor, &xvi)
234 	|| XMatchVisualInfo(_x.display, xrootid, 15, DirectColor, &xvi)){
235 		_x.vis = xvi.visual;
236 		_x.depth = 15;
237 	}
238 	else
239 	if(XMatchVisualInfo(_x.display, xrootid, 24, TrueColor, &xvi)
240 	|| XMatchVisualInfo(_x.display, xrootid, 24, DirectColor, &xvi)){
241 		_x.vis = xvi.visual;
242 		_x.depth = 24;
243 	}
244 	else
245 	if(XMatchVisualInfo(_x.display, xrootid, 8, PseudoColor, &xvi)
246 	|| XMatchVisualInfo(_x.display, xrootid, 8, StaticColor, &xvi)){
247 		if(_x.depth > 8){
248 			werrstr("can't deal with colormapped depth %d screens",
249 				_x.depth);
250 			goto err0;
251 		}
252 		_x.vis = xvi.visual;
253 		_x.depth = 8;
254 	}
255 	else{
256 		_x.depth = DefaultDepth(_x.display, xrootid);
257 		if(_x.depth != 8){
258 			werrstr("can't understand depth %d screen", _x.depth);
259 			goto err0;
260 		}
261 		_x.vis = DefaultVisual(_x.display, xrootid);
262 	}
263 
264 	if(DefaultDepth(_x.display, xrootid) == _x.depth)
265 		_x.usetable = 1;
266 
267 	/*
268 	 * _x.depth is only the number of significant pixel bits,
269 	 * not the total number of pixel bits.  We need to walk the
270 	 * display list to find how many actual bits are used
271 	 * per pixel.
272 	 */
273 	_x.chan = 0;
274 	pfmt = XListPixmapFormats(_x.display, &n);
275 	for(i=0; i<n; i++){
276 		if(pfmt[i].depth == _x.depth){
277 			switch(pfmt[i].bits_per_pixel){
278 			case 1:	/* untested */
279 				_x.chan = GREY1;
280 				break;
281 			case 2:	/* untested */
282 				_x.chan = GREY2;
283 				break;
284 			case 4:	/* untested */
285 				_x.chan = GREY4;
286 				break;
287 			case 8:
288 				_x.chan = CMAP8;
289 				break;
290 			case 15:
291 				_x.chan = RGB15;
292 				break;
293 			case 16: /* how to tell RGB15? */
294 				_x.chan = RGB16;
295 				break;
296 			case 24: /* untested (impossible?) */
297 				_x.chan = RGB24;
298 				break;
299 			case 32:
300 				_x.chan = XRGB32;
301 				break;
302 			}
303 		}
304 	}
305 	if(_x.chan == 0){
306 		werrstr("could not determine screen pixel format");
307 		goto err0;
308 	}
309 
310 	/*
311 	 * Set up color map if necessary.
312 	 */
313 	xscreen = DefaultScreenOfDisplay(_x.display);
314 	_x.cmap = DefaultColormapOfScreen(xscreen);
315 	if(_x.vis->class != StaticColor){
316 		plan9cmap();
317 		setupcmap(xrootwin);
318 	}
319 
320 	/*
321 	 * We get to choose the initial rectangle size.
322 	 * This is arbitrary.  In theory we should read the
323 	 * command line and allow the traditional X options.
324 	 */
325 	if(winsize){
326 		if(parsewinsize(winsize, &r, &havemin) < 0)
327 			sysfatal("%r");
328 	}else{
329 		r = Rect(0, 0, WidthOfScreen(xscreen)*2/3,
330 			HeightOfScreen(xscreen)*2/3);
331 		if(Dx(r) > Dy(r)*3/2)
332 			r.max.x = r.min.x + Dy(r)*3/2;
333 		if(Dy(r) > Dx(r)*3/2)
334 			r.max.y = r.min.y + Dx(r)*3/2;
335 		havemin = 0;
336 	}
337 
338 	memset(&attr, 0, sizeof attr);
339 	attr.colormap = _x.cmap;
340 	attr.background_pixel = ~0;
341 	attr.border_pixel = 0;
342 	_x.drawable = XCreateWindow(
343 		_x.display,	/* display */
344 		xrootwin,	/* parent */
345 		0,		/* x */
346 		0,		/* y */
347 		Dx(r),		/* width */
348 	 	Dy(r),		/* height */
349 		0,		/* border width */
350 		_x.depth,	/* depth */
351 		InputOutput,	/* class */
352 		_x.vis,		/* visual */
353 				/* valuemask */
354 		CWBackPixel|CWBorderPixel|CWColormap,
355 		&attr		/* attributes (the above aren't?!) */
356 	);
357 
358 	/*
359 	 * Label and other properties required by ICCCCM.
360 	 */
361 	memset(&name, 0, sizeof name);
362 	if(label == nil)
363 		label = "pjw-face-here";
364 	name.value = (uchar*)label;
365 	name.encoding = XA_STRING;
366 	name.format = 8;
367 	name.nitems = strlen((char*)name.value);
368 
369 	memset(&normalhint, 0, sizeof normalhint);
370 	normalhint.flags = PSize|PMaxSize;
371 	if(winsize){
372 		normalhint.flags &= ~PSize;
373 		normalhint.flags |= USSize;
374 		normalhint.width = Dx(r);
375 		normalhint.height = Dy(r);
376 	}
377 
378 	normalhint.max_width = WidthOfScreen(xscreen);
379 	normalhint.max_height = HeightOfScreen(xscreen);
380 
381 	memset(&hint, 0, sizeof hint);
382 	hint.flags = InputHint|StateHint;
383 	hint.input = 1;
384 	hint.initial_state = NormalState;
385 
386 	memset(&classhint, 0, sizeof classhint);
387 	classhint.res_name = label;
388 	classhint.res_class = label;
389 
390 	argv[0] = label;
391 	argv[1] = nil;
392 
393 	XSetWMProperties(
394 		_x.display,	/* display */
395 		_x.drawable,	/* window */
396 		&name,		/* XA_WM_NAME property */
397 		&name,		/* XA_WM_ICON_NAME property */
398 		argv,		/* XA_WM_COMMAND */
399 		1,		/* argc */
400 		&normalhint,	/* XA_WM_NORMAL_HINTS */
401 		&hint,		/* XA_WM_HINTS */
402 		&classhint	/* XA_WM_CLASSHINTS */
403 	);
404 	XFlush(_x.display);
405 
406 	if(havemin){
407 		XWindowChanges ch;
408 
409 		memset(&ch, 0, sizeof ch);
410 		ch.x = r.min.x;
411 		ch.y = r.min.y;
412 		XConfigureWindow(_x.display, _x.drawable, CWX|CWY, &ch);
413 fprint(2, "havemin %d %d\n", r.min.x, r.min.y);
414 	}
415 	/*
416 	 * Look up clipboard atom.
417 	 */
418 	_x.clipboard = XInternAtom(_x.display, "CLIPBOARD", False);
419 	_x.utf8string = XInternAtom(_x.display, "UTF8_STRING", False);
420 	_x.targets = XInternAtom(_x.display, "TARGETS", False);
421 	_x.text = XInternAtom(_x.display, "TEXT", False);
422 	_x.compoundtext = XInternAtom(_x.display, "COMPOUND_TEXT", False);
423 	_x.takefocus = XInternAtom(_x.display, "WM_TAKE_FOCUS", False);
424 	_x.losefocus = XInternAtom(_x.display, "_9WM_LOSE_FOCUS", False);
425 	_x.wmprotos = XInternAtom(_x.display, "WM_PROTOCOLS", False);
426 
427 	atoms[0] = _x.takefocus;
428 	atoms[1] = _x.losefocus;
429 	XChangeProperty(_x.display, _x.drawable, _x.wmprotos, XA_ATOM, 32,
430 		PropModeReplace, (uchar*)atoms, 2);
431 
432 	/*
433 	 * Put the window on the screen, check to see what size we actually got.
434 	 */
435 	XMapWindow(_x.display, _x.drawable);
436 	XSync(_x.display, False);
437 
438 	if(!XGetWindowAttributes(_x.display, _x.drawable, &wattr))
439 		fprint(2, "XGetWindowAttributes failed\n");
440 	else if(wattr.width && wattr.height){
441 		if(wattr.width != Dx(r) || wattr.height != Dy(r)){
442 			r.max.x = wattr.width;
443 			r.max.y = wattr.height;
444 		}
445 	}else
446 		fprint(2, "XGetWindowAttributes: bad attrs\n");
447 
448 	/*
449 	 * Allocate our local backing store.
450 	 */
451 	_x.screenr = r;
452 	_x.screenpm = XCreatePixmap(_x.display, _x.drawable, Dx(r), Dy(r), _x.depth);
453 	_x.nextscreenpm = _x.screenpm;
454 	_x.screenimage = _xallocmemimage(r, _x.chan, _x.screenpm);
455 
456 	/*
457 	 * Allocate some useful graphics contexts for the future.
458 	 */
459 	_x.gcfill	= xgc(_x.screenpm, FillSolid, -1);
460 	_x.gccopy	= xgc(_x.screenpm, -1, -1);
461 	_x.gcsimplesrc 	= xgc(_x.screenpm, FillStippled, -1);
462 	_x.gczero	= xgc(_x.screenpm, -1, -1);
463 	_x.gcreplsrc	= xgc(_x.screenpm, FillTiled, -1);
464 
465 	pmid = XCreatePixmap(_x.display, _x.drawable, 1, 1, 1);
466 	_x.gcfill0	= xgc(pmid, FillSolid, 0);
467 	_x.gccopy0	= xgc(pmid, -1, -1);
468 	_x.gcsimplesrc0	= xgc(pmid, FillStippled, -1);
469 	_x.gczero0	= xgc(pmid, -1, -1);
470 	_x.gcreplsrc0	= xgc(pmid, FillTiled, -1);
471 	XFreePixmap(_x.display, pmid);
472 
473 	/*
474 	 * Lots of display connections for various procs.
475 	 */
476 	_x.kbdcon	= XOpenDisplay(NULL);
477 	_x.mousecon	= XOpenDisplay(NULL);
478 	_x.snarfcon	= XOpenDisplay(NULL);
479 
480 	if(0) fprint(2, "x: display=%p kbd=%p mouse=%p snarf=%p\n",
481 		_x.display, _x.kbdcon, _x.mousecon, _x.snarfcon);
482 
483 	_x.black	= xscreen->black_pixel;
484 	_x.white	= xscreen->white_pixel;
485 
486 	return _x.screenimage;
487 
488 err0:
489 fprint(2, "%r\n");
490 	/*
491 	 * Should do a better job of cleaning up here.
492 	 */
493 	XCloseDisplay(_x.display);
494 	return nil;
495 }
496 
497 int
498 drawsetlabel(Display *d, char *label)
499 {
500 	char *argv[2];
501 	XClassHint classhint;
502 	XTextProperty name;
503 
504 	/*
505 	 * Label and other properties required by ICCCCM.
506 	 */
507 	memset(&name, 0, sizeof name);
508 	if(label == nil)
509 		label = "pjw-face-here";
510 	name.value = (uchar*)label;
511 	name.encoding = XA_STRING;
512 	name.format = 8;
513 	name.nitems = strlen((char*)name.value);
514 
515 	memset(&classhint, 0, sizeof classhint);
516 	classhint.res_name = label;
517 	classhint.res_class = label;
518 
519 	argv[0] = label;
520 	argv[1] = nil;
521 
522 	XSetWMProperties(
523 		_x.display,	/* display */
524 		_x.drawable,	/* window */
525 		&name,		/* XA_WM_NAME property */
526 		&name,		/* XA_WM_ICON_NAME property */
527 		argv,		/* XA_WM_COMMAND */
528 		1,		/* argc */
529 		nil,		/* XA_WM_NORMAL_HINTS */
530 		nil,		/* XA_WM_HINTS */
531 		&classhint	/* XA_WM_CLASSHINTS */
532 	);
533 	XFlush(_x.display);
534 	return 0;
535 }
536 
537 /*
538  * Create a GC with a particular fill style and XXX.
539  * Disable generation of GraphicsExpose/NoExpose events in the GC.
540  */
541 static XGC
542 xgc(XDrawable d, int fillstyle, int foreground)
543 {
544 	XGC gc;
545 	XGCValues v;
546 
547 	memset(&v, 0, sizeof v);
548 	v.function = GXcopy;
549 	v.graphics_exposures = False;
550 	gc = XCreateGC(_x.display, d, GCFunction|GCGraphicsExposures, &v);
551 	if(fillstyle != -1)
552 		XSetFillStyle(_x.display, gc, fillstyle);
553 	if(foreground != -1)
554 		XSetForeground(_x.display, gc, 0);
555 	return gc;
556 }
557 
558 
559 /*
560  * Initialize map with the Plan 9 rgbv color map.
561  */
562 static void
563 plan9cmap(void)
564 {
565 	int r, g, b, cr, cg, cb, v, num, den, idx, v7, idx7;
566 	static int once;
567 
568 	if(once)
569 		return;
570 	once = 1;
571 
572 	for(r=0; r!=4; r++)
573 	for(g = 0; g != 4; g++)
574 	for(b = 0; b!=4; b++)
575 	for(v = 0; v!=4; v++){
576 		den=r;
577 		if(g > den)
578 			den=g;
579 		if(b > den)
580 			den=b;
581 		/* divide check -- pick grey shades */
582 		if(den==0)
583 			cr=cg=cb=v*17;
584 		else {
585 			num=17*(4*den+v);
586 			cr=r*num/den;
587 			cg=g*num/den;
588 			cb=b*num/den;
589 		}
590 		idx = r*64 + v*16 + ((g*4 + b + v - r) & 15);
591 		_x.map[idx].red = cr*0x0101;
592 		_x.map[idx].green = cg*0x0101;
593 		_x.map[idx].blue = cb*0x0101;
594 		_x.map[idx].pixel = idx;
595 		_x.map[idx].flags = DoRed|DoGreen|DoBlue;
596 
597 		v7 = v >> 1;
598 		idx7 = r*32 + v7*16 + g*4 + b;
599 		if((v & 1) == v7){
600 			_x.map7to8[idx7][0] = idx;
601 			if(den == 0) { 		/* divide check -- pick grey shades */
602 				cr = ((255.0/7.0)*v7)+0.5;
603 				cg = cr;
604 				cb = cr;
605 			}
606 			else {
607 				num=17*15*(4*den+v7*2)/14;
608 				cr=r*num/den;
609 				cg=g*num/den;
610 				cb=b*num/den;
611 			}
612 			_x.map7[idx7].red = cr*0x0101;
613 			_x.map7[idx7].green = cg*0x0101;
614 			_x.map7[idx7].blue = cb*0x0101;
615 			_x.map7[idx7].pixel = idx7;
616 			_x.map7[idx7].flags = DoRed|DoGreen|DoBlue;
617 		}
618 		else
619 			_x.map7to8[idx7][1] = idx;
620 	}
621 }
622 
623 /*
624  * Initialize and install the rgbv color map as a private color map
625  * for this application.  It gets the best colors when it has the
626  * cursor focus.
627  *
628  * We always choose the best depth possible, but that might not
629  * be the default depth.  On such "suboptimal" systems, we have to allocate an
630  * empty color map anyway, according to Axel Belinfante.
631  */
632 static int 
633 setupcmap(XWindow w)
634 {
635 	char buf[30];
636 	int i;
637 	u32int p, pp;
638 	XColor c;
639 
640 	if(_x.depth <= 1)
641 		return 0;
642 
643 	if(_x.depth >= 24) {
644 		if(_x.usetable == 0)
645 			_x.cmap = XCreateColormap(_x.display, w, _x.vis, AllocNone); 
646 
647 		/*
648 		 * The pixel value returned from XGetPixel needs to
649 		 * be converted to RGB so we can call rgb2cmap()
650 		 * to translate between 24 bit X and our color. Unfortunately,
651 		 * the return value appears to be display server endian 
652 		 * dependant. Therefore, we run some heuristics to later
653 		 * determine how to mask the int value correctly.
654 		 * Yeah, I know we can look at _x.vis->byte_order but 
655 		 * some displays say MSB even though they run on LSB.
656 		 * Besides, this is more anal.
657 		 */
658 		c = _x.map[19];	/* known to have different R, G, B values */
659 		if(!XAllocColor(_x.display, _x.cmap, &c)){
660 			werrstr("XAllocColor: %r");
661 			return -1;
662 		}
663 		p  = c.pixel;
664 		pp = rgb2cmap((p>>16)&0xff,(p>>8)&0xff,p&0xff);
665 		if(pp != _x.map[19].pixel) {
666 			/* check if endian is other way */
667 			pp = rgb2cmap(p&0xff,(p>>8)&0xff,(p>>16)&0xff);
668 			if(pp != _x.map[19].pixel){
669 				werrstr("cannot detect X server byte order");
670 				return -1;
671 			}
672 
673 			switch(_x.chan){
674 			case RGB24:
675 				_x.chan = BGR24;
676 				break;
677 			case XRGB32:
678 				_x.chan = XBGR32;
679 				break;
680 			default:
681 				werrstr("cannot byteswap channel %s",
682 					chantostr(buf, _x.chan));
683 				break;
684 			}
685 		}
686 	}else if(_x.vis->class == TrueColor || _x.vis->class == DirectColor){
687 		/*
688 		 * Do nothing.  We have no way to express a
689 		 * mixed-endian 16-bit screen, so pretend they don't exist.
690 		 */
691 		if(_x.usetable == 0)
692 			_x.cmap = XCreateColormap(_x.display, w, _x.vis, AllocNone);
693 	}else if(_x.vis->class == PseudoColor){
694 		if(_x.usetable == 0){
695 			_x.cmap = XCreateColormap(_x.display, w, _x.vis, AllocAll); 
696 			XStoreColors(_x.display, _x.cmap, _x.map, 256);
697 			for(i = 0; i < 256; i++){
698 				_x.tox11[i] = i;
699 				_x.toplan9[i] = i;
700 			}
701 		}else{
702 			for(i = 0; i < 128; i++){
703 				c = _x.map7[i];
704 				if(!XAllocColor(_x.display, _x.cmap, &c)){
705 					werrstr("can't allocate colors in 7-bit map");
706 					return -1;
707 				}
708 				_x.tox11[_x.map7to8[i][0]] = c.pixel;
709 				_x.tox11[_x.map7to8[i][1]] = c.pixel;
710 				_x.toplan9[c.pixel] = _x.map7to8[i][0];
711 			}
712 		}
713 	}else{
714 		werrstr("unsupported visual class %d", _x.vis->class);
715 		return -1;
716 	}
717 	return 0;
718 }
719 
720 void
721 flushmemscreen(Rectangle r)
722 {
723 	if(_x.nextscreenpm != _x.screenpm){
724 		qlock(&_x.screenlock);
725 		XSync(_x.display, False);
726 		XFreePixmap(_x.display, _x.screenpm);
727 		_x.screenpm = _x.nextscreenpm;
728 		qunlock(&_x.screenlock);
729 	}
730 
731 	if(r.min.x >= r.max.x || r.min.y >= r.max.y)
732 		return;
733 	XCopyArea(_x.display, _x.screenpm, _x.drawable, _x.gccopy, r.min.x, r.min.y,
734 		Dx(r), Dy(r), r.min.x, r.min.y);
735 	XFlush(_x.display);
736 }
737 
738 void
739 _xexpose(XEvent *e, XDisplay *xd)
740 {
741 	XExposeEvent *xe;
742 	Rectangle r;
743 
744 	qlock(&_x.screenlock);
745 	if(_x.screenpm != _x.nextscreenpm){
746 		qunlock(&_x.screenlock);
747 		return;
748 	}
749 	xe = (XExposeEvent*)e;
750 	r.min.x = xe->x;
751 	r.min.y = xe->y;
752 	r.max.x = xe->x+xe->width;
753 	r.max.y = xe->y+xe->height;
754 	XCopyArea(xd, _x.screenpm, _x.drawable, _x.gccopy, r.min.x, r.min.y,
755 		Dx(r), Dy(r), r.min.x, r.min.y);
756 	XSync(xd, False);
757 	qunlock(&_x.screenlock);
758 }
759 
760 int
761 _xdestroy(XEvent *e, XDisplay *xd)
762 {
763 	XDestroyWindowEvent *xe;
764 
765 	xe = (XDestroyWindowEvent*)e;
766 	if(xe->window == _x.drawable){
767 		_x.destroyed = 1;
768 		return 1;
769 	}
770 	return 0;
771 }
772 
773 int
774 _xconfigure(XEvent *e, XDisplay *xd)
775 {
776 	Rectangle r;
777 	XConfigureEvent *xe = (XConfigureEvent*)e;
778 
779 	if(xe->width == Dx(_x.screenr) && xe->height == Dy(_x.screenr))
780 		return 0;
781 	if(xe->width==0 || xe->height==0)
782 		fprint(2, "ignoring resize to %dx%d\n", xe->width, xe->height);
783 	r = Rect(0, 0, xe->width, xe->height);
784 	qlock(&_x.screenlock);
785 	if(_x.screenpm != _x.nextscreenpm){
786 		XCopyArea(xd, _x.screenpm, _x.drawable, _x.gccopy, r.min.x, r.min.y,
787 			Dx(r), Dy(r), r.min.x, r.min.y);
788 		XSync(xd, False);
789 	}
790 	qunlock(&_x.screenlock);
791 	_x.newscreenr = r;
792 	return 1;
793 }
794 
795 static int
796 xreplacescreenimage(void)
797 {
798 	Memimage *m;
799 	XDrawable pixmap;
800 	Rectangle r;
801 
802 	r = _x.newscreenr;
803 	if(eqrect(_x.screenr, r))
804 		return 0;
805 
806 	pixmap = XCreatePixmap(_x.display, _x.drawable, Dx(r), Dy(r), _x.depth);
807 	m = _xallocmemimage(r, _x.chan, pixmap);
808 	if(_x.nextscreenpm != _x.screenpm)
809 		XFreePixmap(_x.display, _x.nextscreenpm);
810 	_x.nextscreenpm = pixmap;
811 	_x.screenr = r;
812 	_drawreplacescreenimage(m);
813 	return 1;
814 }
815 
816 static int
817 parsewinsize(char *s, Rectangle *r, int *havemin)
818 {
819 	char c, *os;
820 	int i, j, k, l;
821 
822 	os = s;
823 	*havemin = 0;
824 	*r = Rect(0,0,0,0);
825 	if(!isdigit(*s))
826 		goto oops;
827 	i = strtol(s, &s, 0);
828 	if(*s == 'x'){
829 		s++;
830 		if(!isdigit(*s))
831 			goto oops;
832 		j = strtol(s, &s, 0);
833 		r->max.x = i;
834 		r->max.y = j;
835 		if(*s == 0)
836 			return 0;
837 		if(*s != '@')
838 			goto oops;
839 
840 		s++;
841 		if(!isdigit(*s))
842 			goto oops;
843 		i = strtol(s, &s, 0);
844 		if(*s != ',' && *s != ' ')
845 			goto oops;
846 		s++;
847 		if(!isdigit(*s))
848 			goto oops;
849 		j = strtol(s, &s, 0);
850 		if(*s != 0)
851 			goto oops;
852 		*r = rectaddpt(*r, Pt(i,j));
853 		*havemin = 1;
854 		return 0;
855 	}
856 
857 	c = *s;
858 	if(c != ' ' && c != ',')
859 		goto oops;
860 	s++;
861 	if(!isdigit(*s))
862 		goto oops;
863 	j = strtol(s, &s, 0);
864 	if(*s != c)
865 		goto oops;
866 	s++;
867 	if(!isdigit(*s))
868 		goto oops;
869 	k = strtol(s, &s, 0);
870 	if(*s != c)
871 		goto oops;
872 	s++;
873 	if(!isdigit(*s))
874 		goto oops;
875 	l = strtol(s, &s, 0);
876 	if(*s != 0)
877 		goto oops;
878 	*r = Rect(i,j,k,l);
879 	*havemin = 1;
880 	return 0;
881 
882 oops:
883 	werrstr("bad syntax in window size '%s'", os);
884 	return -1;
885 }