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 #include "devdraw.h"
14 
15 static void	plan9cmap(void);
16 static int	setupcmap(XWindow);
17 static XGC	xgc(XDrawable, int, int);
18 
19 Xprivate _x;
20 
21 static int
22 xerror(XDisplay *d, XErrorEvent *e)
23 {
24 	char buf[200];
25 
26 	if(e->request_code == 42) /* XSetInputFocus */
27 		return 0;
28 	if(e->request_code == 18) /* XChangeProperty */
29 		return 0;
30 	/*
31 	 * BadDrawable happens in apps that get resized a LOT,
32 	 * e.g. when KDE is configured to resize continuously
33 	 * during a window drag.
34 	 */
35 	if(e->error_code == 9) /* BadDrawable */
36 		return 0;
37 
38 	fprint(2, "X error: error_code=%d, request_code=%d, minor=%d disp=%p\n",
39 		e->error_code, e->request_code, e->minor_code, d);
40 	XGetErrorText(d, e->error_code, buf, sizeof buf);
41 	fprint(2, "%s\n", buf);
42 	return 0;
43 }
44 
45 static int
46 xioerror(XDisplay *d)
47 {
48 	/*print("X I/O error\n"); */
49 	exit(0);
50 	/*sysfatal("X I/O error\n");*/
51 	abort();
52 	return -1;
53 }
54 
55 
56 Memimage*
57 _xattach(char *label, char *winsize)
58 {
59 	char *argv[2], *disp;
60 	int i, havemin, height, mask, n, width, x, xrootid, y;
61 	Rectangle r;
62 	XClassHint classhint;
63 	XDrawable pmid;
64 	XPixmapFormatValues *pfmt;
65 	XScreen *xscreen;
66 	XSetWindowAttributes attr;
67 	XSizeHints normalhint;
68 	XTextProperty name;
69 	XVisualInfo xvi;
70 	XWindow xrootwin;
71 	XWindowAttributes wattr;
72 	XWMHints hint;
73 	Atom atoms[2];
74 
75 	/*
76 	if(XInitThreads() == 0){
77 		fprint(2, "XInitThreads failed\n");
78 		abort();
79 	}
80 	*/
81 
82 	/*
83 	 * Connect to X server.
84 	 */
85 	_x.display = XOpenDisplay(NULL);
86 	if(_x.display == nil){
87 		disp = getenv("DISPLAY");
88 		werrstr("XOpenDisplay %s: %r", disp ? disp : ":0");
89 		free(disp);
90 		return nil;
91 	}
92 	_x.fd = ConnectionNumber(_x.display);
93 	XSetErrorHandler(xerror);
94 	XSetIOErrorHandler(xioerror);
95 	xrootid = DefaultScreen(_x.display);
96 	xrootwin = DefaultRootWindow(_x.display);
97 
98 	/* 
99 	 * Figure out underlying screen format.
100 	 */
101 	if(XMatchVisualInfo(_x.display, xrootid, 24, TrueColor, &xvi)
102 	|| XMatchVisualInfo(_x.display, xrootid, 24, DirectColor, &xvi)){
103 		_x.vis = xvi.visual;
104 		_x.depth = 24;
105 	}
106 	else
107 	if(XMatchVisualInfo(_x.display, xrootid, 16, TrueColor, &xvi)
108 	|| XMatchVisualInfo(_x.display, xrootid, 16, DirectColor, &xvi)){
109 		_x.vis = xvi.visual;
110 		_x.depth = 16;
111 	}
112 	else
113 	if(XMatchVisualInfo(_x.display, xrootid, 15, TrueColor, &xvi)
114 	|| XMatchVisualInfo(_x.display, xrootid, 15, DirectColor, &xvi)){
115 		_x.vis = xvi.visual;
116 		_x.depth = 15;
117 	}
118 	else
119 	if(XMatchVisualInfo(_x.display, xrootid, 8, PseudoColor, &xvi)
120 	|| XMatchVisualInfo(_x.display, xrootid, 8, StaticColor, &xvi)){
121 		if(_x.depth > 8){
122 			werrstr("can't deal with colormapped depth %d screens",
123 				_x.depth);
124 			goto err0;
125 		}
126 		_x.vis = xvi.visual;
127 		_x.depth = 8;
128 	}
129 	else{
130 		_x.depth = DefaultDepth(_x.display, xrootid);
131 		if(_x.depth != 8){
132 			werrstr("can't understand depth %d screen", _x.depth);
133 			goto err0;
134 		}
135 		_x.vis = DefaultVisual(_x.display, xrootid);
136 	}
137 
138 	if(DefaultDepth(_x.display, xrootid) == _x.depth)
139 		_x.usetable = 1;
140 
141 	/*
142 	 * _x.depth is only the number of significant pixel bits,
143 	 * not the total number of pixel bits.  We need to walk the
144 	 * display list to find how many actual bits are used
145 	 * per pixel.
146 	 */
147 	_x.chan = 0;
148 	pfmt = XListPixmapFormats(_x.display, &n);
149 	for(i=0; i<n; i++){
150 		if(pfmt[i].depth == _x.depth){
151 			switch(pfmt[i].bits_per_pixel){
152 			case 1:	/* untested */
153 				_x.chan = GREY1;
154 				break;
155 			case 2:	/* untested */
156 				_x.chan = GREY2;
157 				break;
158 			case 4:	/* untested */
159 				_x.chan = GREY4;
160 				break;
161 			case 8:
162 				_x.chan = CMAP8;
163 				break;
164 			case 15:
165 				_x.chan = RGB15;
166 				break;
167 			case 16: /* how to tell RGB15? */
168 				_x.chan = RGB16;
169 				break;
170 			case 24: /* untested (impossible?) */
171 				_x.chan = RGB24;
172 				break;
173 			case 32:
174 				_x.chan = XRGB32;
175 				break;
176 			}
177 		}
178 	}
179 	if(_x.chan == 0){
180 		werrstr("could not determine screen pixel format");
181 		goto err0;
182 	}
183 
184 	/*
185 	 * Set up color map if necessary.
186 	 */
187 	xscreen = DefaultScreenOfDisplay(_x.display);
188 	_x.cmap = DefaultColormapOfScreen(xscreen);
189 	if(_x.vis->class != StaticColor){
190 		plan9cmap();
191 		setupcmap(xrootwin);
192 	}
193 
194 	/*
195 	 * We get to choose the initial rectangle size.
196 	 * This is arbitrary.  In theory we should read the
197 	 * command line and allow the traditional X options.
198 	 */
199 	mask = 0;
200 	x = 0;
201 	y = 0;
202 	if(winsize && winsize[0]){
203 		if(parsewinsize(winsize, &r, &havemin) < 0)
204 			sysfatal("%r");
205 	}else{
206 		/*
207 		 * Parse the various X resources.  Thanks to Peter Canning.
208 		 */
209 		char *screen_resources, *display_resources, *geom, 
210 			*geomrestype, *home, *file;
211 		XrmDatabase database;
212 		XrmValue geomres;
213 
214 		database = XrmGetDatabase(_x.display);
215 		screen_resources = XScreenResourceString(xscreen);
216 		if(screen_resources != nil){
217 			XrmCombineDatabase(XrmGetStringDatabase(screen_resources), &database, False);
218 			XFree(screen_resources);
219 		}
220 
221 		display_resources = XResourceManagerString(_x.display);
222 		if(display_resources == nil){
223 			home = getenv("HOME");
224 			if(home!=nil && (file=smprint("%s/.Xdefaults", home)) != nil){
225 				XrmCombineFileDatabase(file, &database, False);
226 				free(file);
227 			}
228 			free(home);
229 		}else
230 			XrmCombineDatabase(XrmGetStringDatabase(display_resources), &database, False);
231 
232 		geom = smprint("%s.geometry", label);
233 		if(geom && XrmGetResource(database, geom, nil, &geomrestype, &geomres))
234 			mask = XParseGeometry(geomres.addr, &x, &y, (uint*)&width, (uint*)&height);
235 		free(geom);
236 
237 		if((mask & WidthValue) && (mask & HeightValue)){
238 			r = Rect(0, 0, width, height);
239 		}else{
240 			r = Rect(0, 0, WidthOfScreen(xscreen)*3/4,
241 					HeightOfScreen(xscreen)*3/4);
242 			if(Dx(r) > Dy(r)*3/2)
243 				r.max.x = r.min.x + Dy(r)*3/2;
244 			if(Dy(r) > Dx(r)*3/2)
245 				r.max.y = r.min.y + Dx(r)*3/2;
246 		}
247 		if(mask & XNegative){
248 			x += WidthOfScreen(xscreen);
249 		}
250 		if(mask & YNegative){
251 			y += HeightOfScreen(xscreen);
252 		}
253 		havemin = 0;
254 	}
255 	screenrect = Rect(0, 0, WidthOfScreen(xscreen), HeightOfScreen(xscreen));
256 	windowrect = r;
257 
258 	memset(&attr, 0, sizeof attr);
259 	attr.colormap = _x.cmap;
260 	attr.background_pixel = ~0;
261 	attr.border_pixel = 0;
262 	_x.drawable = XCreateWindow(
263 		_x.display,	/* display */
264 		xrootwin,	/* parent */
265 		x,		/* x */
266 		y,		/* y */
267 		Dx(r),		/* width */
268 	 	Dy(r),		/* height */
269 		0,		/* border width */
270 		_x.depth,	/* depth */
271 		InputOutput,	/* class */
272 		_x.vis,		/* visual */
273 				/* valuemask */
274 		CWBackPixel|CWBorderPixel|CWColormap,
275 		&attr		/* attributes (the above aren't?!) */
276 	);
277 
278 	/*
279 	 * Label and other properties required by ICCCCM.
280 	 */
281 	memset(&name, 0, sizeof name);
282 	if(label == nil)
283 		label = "pjw-face-here";
284 	name.value = (uchar*)label;
285 	name.encoding = XA_STRING;
286 	name.format = 8;
287 	name.nitems = strlen((char*)name.value);
288 
289 	memset(&normalhint, 0, sizeof normalhint);
290 	normalhint.flags = PSize|PMaxSize;
291 	if(winsize && winsize[0]){
292 		normalhint.flags &= ~PSize;
293 		normalhint.flags |= USSize;
294 		normalhint.width = Dx(r);
295 		normalhint.height = Dy(r);
296 	}else{
297 		if((mask & WidthValue) && (mask & HeightValue)){
298 			normalhint.flags &= ~PSize;
299 			normalhint.flags |= USSize;
300 			normalhint.width = width;
301 			normalhint.height = height;
302 		}
303 		if((mask & WidthValue) && (mask & HeightValue)){
304 			normalhint.flags |= USPosition;
305 			normalhint.x = x;
306 			normalhint.y = y;
307 		}
308 	}
309 
310 	normalhint.max_width = WidthOfScreen(xscreen);
311 	normalhint.max_height = HeightOfScreen(xscreen);
312 
313 	memset(&hint, 0, sizeof hint);
314 	hint.flags = InputHint|StateHint;
315 	hint.input = 1;
316 	hint.initial_state = NormalState;
317 
318 	memset(&classhint, 0, sizeof classhint);
319 	classhint.res_name = label;
320 	classhint.res_class = label;
321 
322 	argv[0] = label;
323 	argv[1] = nil;
324 
325 	XSetWMProperties(
326 		_x.display,	/* display */
327 		_x.drawable,	/* window */
328 		&name,		/* XA_WM_NAME property */
329 		&name,		/* XA_WM_ICON_NAME property */
330 		argv,		/* XA_WM_COMMAND */
331 		1,		/* argc */
332 		&normalhint,	/* XA_WM_NORMAL_HINTS */
333 		&hint,		/* XA_WM_HINTS */
334 		&classhint	/* XA_WM_CLASSHINTS */
335 	);
336 	XFlush(_x.display);
337 
338 	if(havemin){
339 		XWindowChanges ch;
340 
341 		memset(&ch, 0, sizeof ch);
342 		ch.x = r.min.x;
343 		ch.y = r.min.y;
344 		XConfigureWindow(_x.display, _x.drawable, CWX|CWY, &ch);
345 		/*
346 		 * Must pretend origin is 0,0 for X.
347 		 */
348 		r = Rect(0,0,Dx(r),Dy(r));
349 	}
350 	/*
351 	 * Look up clipboard atom.
352 	 */
353 	_x.clipboard = XInternAtom(_x.display, "CLIPBOARD", False);
354 	_x.utf8string = XInternAtom(_x.display, "UTF8_STRING", False);
355 	_x.targets = XInternAtom(_x.display, "TARGETS", False);
356 	_x.text = XInternAtom(_x.display, "TEXT", False);
357 	_x.compoundtext = XInternAtom(_x.display, "COMPOUND_TEXT", False);
358 	_x.takefocus = XInternAtom(_x.display, "WM_TAKE_FOCUS", False);
359 	_x.losefocus = XInternAtom(_x.display, "_9WM_LOSE_FOCUS", False);
360 	_x.wmprotos = XInternAtom(_x.display, "WM_PROTOCOLS", False);
361 
362 	atoms[0] = _x.takefocus;
363 	atoms[1] = _x.losefocus;
364 	XChangeProperty(_x.display, _x.drawable, _x.wmprotos, XA_ATOM, 32,
365 		PropModeReplace, (uchar*)atoms, 2);
366 
367 	/*
368 	 * Put the window on the screen, check to see what size we actually got.
369 	 */
370 	XMapWindow(_x.display, _x.drawable);
371 	XSync(_x.display, False);
372 
373 	if(!XGetWindowAttributes(_x.display, _x.drawable, &wattr))
374 		fprint(2, "XGetWindowAttributes failed\n");
375 	else if(wattr.width && wattr.height){
376 		if(wattr.width != Dx(r) || wattr.height != Dy(r)){
377 			r.max.x = wattr.width;
378 			r.max.y = wattr.height;
379 		}
380 	}else
381 		fprint(2, "XGetWindowAttributes: bad attrs\n");
382 
383 	/*
384 	 * Allocate our local backing store.
385 	 */
386 	_x.screenr = r;
387 	_x.screenpm = XCreatePixmap(_x.display, _x.drawable, Dx(r), Dy(r), _x.depth);
388 	_x.nextscreenpm = _x.screenpm;
389 	_x.screenimage = _xallocmemimage(r, _x.chan, _x.screenpm);
390 
391 	/*
392 	 * Allocate some useful graphics contexts for the future.
393 	 */
394 	_x.gcfill	= xgc(_x.screenpm, FillSolid, -1);
395 	_x.gccopy	= xgc(_x.screenpm, -1, -1);
396 	_x.gcsimplesrc 	= xgc(_x.screenpm, FillStippled, -1);
397 	_x.gczero	= xgc(_x.screenpm, -1, -1);
398 	_x.gcreplsrc	= xgc(_x.screenpm, FillTiled, -1);
399 
400 	pmid = XCreatePixmap(_x.display, _x.drawable, 1, 1, 1);
401 	_x.gcfill0	= xgc(pmid, FillSolid, 0);
402 	_x.gccopy0	= xgc(pmid, -1, -1);
403 	_x.gcsimplesrc0	= xgc(pmid, FillStippled, -1);
404 	_x.gczero0	= xgc(pmid, -1, -1);
405 	_x.gcreplsrc0	= xgc(pmid, FillTiled, -1);
406 	XFreePixmap(_x.display, pmid);
407 
408 	return _x.screenimage;
409 
410 err0:
411 	/*
412 	 * Should do a better job of cleaning up here.
413 	 */
414 	XCloseDisplay(_x.display);
415 	return nil;
416 }
417 
418 int
419 _xsetlabel(char *label)
420 {
421 	XTextProperty name;
422 
423 	/*
424 	 * Label and other properties required by ICCCCM.
425 	 */
426 	memset(&name, 0, sizeof name);
427 	if(label == nil)
428 		label = "pjw-face-here";
429 	name.value = (uchar*)label;
430 	name.encoding = XA_STRING;
431 	name.format = 8;
432 	name.nitems = strlen((char*)name.value);
433 
434 	XSetWMProperties(
435 		_x.display,	/* display */
436 		_x.drawable,	/* window */
437 		&name,		/* XA_WM_NAME property */
438 		&name,		/* XA_WM_ICON_NAME property */
439 		nil,		/* XA_WM_COMMAND */
440 		0,		/* argc */
441 		nil,		/* XA_WM_NORMAL_HINTS */
442 		nil,		/* XA_WM_HINTS */
443 		nil	/* XA_WM_CLASSHINTS */
444 	);
445 	XFlush(_x.display);
446 	return 0;
447 }
448 
449 /*
450  * Create a GC with a particular fill style and XXX.
451  * Disable generation of GraphicsExpose/NoExpose events in the GC.
452  */
453 static XGC
454 xgc(XDrawable d, int fillstyle, int foreground)
455 {
456 	XGC gc;
457 	XGCValues v;
458 
459 	memset(&v, 0, sizeof v);
460 	v.function = GXcopy;
461 	v.graphics_exposures = False;
462 	gc = XCreateGC(_x.display, d, GCFunction|GCGraphicsExposures, &v);
463 	if(fillstyle != -1)
464 		XSetFillStyle(_x.display, gc, fillstyle);
465 	if(foreground != -1)
466 		XSetForeground(_x.display, gc, 0);
467 	return gc;
468 }
469 
470 
471 /*
472  * Initialize map with the Plan 9 rgbv color map.
473  */
474 static void
475 plan9cmap(void)
476 {
477 	int r, g, b, cr, cg, cb, v, num, den, idx, v7, idx7;
478 	static int once;
479 
480 	if(once)
481 		return;
482 	once = 1;
483 
484 	for(r=0; r!=4; r++)
485 	for(g = 0; g != 4; g++)
486 	for(b = 0; b!=4; b++)
487 	for(v = 0; v!=4; v++){
488 		den=r;
489 		if(g > den)
490 			den=g;
491 		if(b > den)
492 			den=b;
493 		/* divide check -- pick grey shades */
494 		if(den==0)
495 			cr=cg=cb=v*17;
496 		else {
497 			num=17*(4*den+v);
498 			cr=r*num/den;
499 			cg=g*num/den;
500 			cb=b*num/den;
501 		}
502 		idx = r*64 + v*16 + ((g*4 + b + v - r) & 15);
503 		_x.map[idx].red = cr*0x0101;
504 		_x.map[idx].green = cg*0x0101;
505 		_x.map[idx].blue = cb*0x0101;
506 		_x.map[idx].pixel = idx;
507 		_x.map[idx].flags = DoRed|DoGreen|DoBlue;
508 
509 		v7 = v >> 1;
510 		idx7 = r*32 + v7*16 + g*4 + b;
511 		if((v & 1) == v7){
512 			_x.map7to8[idx7][0] = idx;
513 			if(den == 0) { 		/* divide check -- pick grey shades */
514 				cr = ((255.0/7.0)*v7)+0.5;
515 				cg = cr;
516 				cb = cr;
517 			}
518 			else {
519 				num=17*15*(4*den+v7*2)/14;
520 				cr=r*num/den;
521 				cg=g*num/den;
522 				cb=b*num/den;
523 			}
524 			_x.map7[idx7].red = cr*0x0101;
525 			_x.map7[idx7].green = cg*0x0101;
526 			_x.map7[idx7].blue = cb*0x0101;
527 			_x.map7[idx7].pixel = idx7;
528 			_x.map7[idx7].flags = DoRed|DoGreen|DoBlue;
529 		}
530 		else
531 			_x.map7to8[idx7][1] = idx;
532 	}
533 }
534 
535 /*
536  * Initialize and install the rgbv color map as a private color map
537  * for this application.  It gets the best colors when it has the
538  * cursor focus.
539  *
540  * We always choose the best depth possible, but that might not
541  * be the default depth.  On such "suboptimal" systems, we have to allocate an
542  * empty color map anyway, according to Axel Belinfante.
543  */
544 static int 
545 setupcmap(XWindow w)
546 {
547 	char buf[30];
548 	int i;
549 	u32int p, pp;
550 	XColor c;
551 
552 	if(_x.depth <= 1)
553 		return 0;
554 
555 	if(_x.depth >= 24) {
556 		if(_x.usetable == 0)
557 			_x.cmap = XCreateColormap(_x.display, w, _x.vis, AllocNone); 
558 
559 		/*
560 		 * The pixel value returned from XGetPixel needs to
561 		 * be converted to RGB so we can call rgb2cmap()
562 		 * to translate between 24 bit X and our color. Unfortunately,
563 		 * the return value appears to be display server endian 
564 		 * dependant. Therefore, we run some heuristics to later
565 		 * determine how to mask the int value correctly.
566 		 * Yeah, I know we can look at _x.vis->byte_order but 
567 		 * some displays say MSB even though they run on LSB.
568 		 * Besides, this is more anal.
569 		 */
570 		c = _x.map[19];	/* known to have different R, G, B values */
571 		if(!XAllocColor(_x.display, _x.cmap, &c)){
572 			werrstr("XAllocColor: %r");
573 			return -1;
574 		}
575 		p  = c.pixel;
576 		pp = rgb2cmap((p>>16)&0xff,(p>>8)&0xff,p&0xff);
577 		if(pp != _x.map[19].pixel) {
578 			/* check if endian is other way */
579 			pp = rgb2cmap(p&0xff,(p>>8)&0xff,(p>>16)&0xff);
580 			if(pp != _x.map[19].pixel){
581 				werrstr("cannot detect X server byte order");
582 				return -1;
583 			}
584 
585 			switch(_x.chan){
586 			case RGB24:
587 				_x.chan = BGR24;
588 				break;
589 			case XRGB32:
590 				_x.chan = XBGR32;
591 				break;
592 			default:
593 				werrstr("cannot byteswap channel %s",
594 					chantostr(buf, _x.chan));
595 				break;
596 			}
597 		}
598 	}else if(_x.vis->class == TrueColor || _x.vis->class == DirectColor){
599 		/*
600 		 * Do nothing.  We have no way to express a
601 		 * mixed-endian 16-bit screen, so pretend they don't exist.
602 		 */
603 		if(_x.usetable == 0)
604 			_x.cmap = XCreateColormap(_x.display, w, _x.vis, AllocNone);
605 	}else if(_x.vis->class == PseudoColor){
606 		if(_x.usetable == 0){
607 			_x.cmap = XCreateColormap(_x.display, w, _x.vis, AllocAll); 
608 			XStoreColors(_x.display, _x.cmap, _x.map, 256);
609 			for(i = 0; i < 256; i++){
610 				_x.tox11[i] = i;
611 				_x.toplan9[i] = i;
612 			}
613 		}else{
614 			for(i = 0; i < 128; i++){
615 				c = _x.map7[i];
616 				if(!XAllocColor(_x.display, _x.cmap, &c)){
617 					werrstr("can't allocate colors in 7-bit map");
618 					return -1;
619 				}
620 				_x.tox11[_x.map7to8[i][0]] = c.pixel;
621 				_x.tox11[_x.map7to8[i][1]] = c.pixel;
622 				_x.toplan9[c.pixel] = _x.map7to8[i][0];
623 			}
624 		}
625 	}else{
626 		werrstr("unsupported visual class %d", _x.vis->class);
627 		return -1;
628 	}
629 	return 0;
630 }
631 
632 void
633 _flushmemscreen(Rectangle r)
634 {
635 	if(_x.nextscreenpm != _x.screenpm){
636 		qlock(&_x.screenlock);
637 		XSync(_x.display, False);
638 		XFreePixmap(_x.display, _x.screenpm);
639 		_x.screenpm = _x.nextscreenpm;
640 		qunlock(&_x.screenlock);
641 	}
642 
643 	if(r.min.x >= r.max.x || r.min.y >= r.max.y)
644 		return;
645 	XCopyArea(_x.display, _x.screenpm, _x.drawable, _x.gccopy, r.min.x, r.min.y,
646 		Dx(r), Dy(r), r.min.x, r.min.y);
647 	XFlush(_x.display);
648 }
649 
650 void
651 _xexpose(XEvent *e)
652 {
653 	XExposeEvent *xe;
654 	Rectangle r;
655 
656 	qlock(&_x.screenlock);
657 	if(_x.screenpm != _x.nextscreenpm){
658 		qunlock(&_x.screenlock);
659 		return;
660 	}
661 	xe = (XExposeEvent*)e;
662 	r.min.x = xe->x;
663 	r.min.y = xe->y;
664 	r.max.x = xe->x+xe->width;
665 	r.max.y = xe->y+xe->height;
666 	XCopyArea(_x.display, _x.screenpm, _x.drawable, _x.gccopy, r.min.x, r.min.y,
667 		Dx(r), Dy(r), r.min.x, r.min.y);
668 	XSync(_x.display, False);
669 	qunlock(&_x.screenlock);
670 }
671 
672 int
673 _xdestroy(XEvent *e)
674 {
675 	XDestroyWindowEvent *xe;
676 
677 	xe = (XDestroyWindowEvent*)e;
678 	if(xe->window == _x.drawable){
679 		_x.destroyed = 1;
680 		return 1;
681 	}
682 	return 0;
683 }
684 
685 int
686 _xconfigure(XEvent *e)
687 {
688 	Rectangle r;
689 	XConfigureEvent *xe = (XConfigureEvent*)e;
690 
691 	if(!fullscreen){
692 		int rx, ry;
693 		XWindow w;
694 		if(XTranslateCoordinates(_x.display, _x.drawable, DefaultRootWindow(_x.display), 0, 0, &rx, &ry, &w))
695 			windowrect = Rect(rx, ry, rx+xe->width, ry+xe->height);
696 	}
697 
698 	if(xe->width == Dx(_x.screenr) && xe->height == Dy(_x.screenr))
699 		return 0;
700 	r = Rect(0, 0, xe->width, xe->height);
701 
702 	qlock(&_x.screenlock);
703 	if(_x.screenpm != _x.nextscreenpm){
704 		XCopyArea(_x.display, _x.screenpm, _x.drawable, _x.gccopy, r.min.x, r.min.y,
705 			Dx(r), Dy(r), r.min.x, r.min.y);
706 		XSync(_x.display, False);
707 	}
708 	qunlock(&_x.screenlock);
709 	_x.newscreenr = r;
710 	return 1;
711 }
712 
713 int
714 _xreplacescreenimage(void)
715 {
716 	Memimage *m;
717 	XDrawable pixmap;
718 	Rectangle r;
719 
720 	r = _x.newscreenr;
721 
722 	pixmap = XCreatePixmap(_x.display, _x.drawable, Dx(r), Dy(r), _x.depth);
723 	m = _xallocmemimage(r, _x.chan, pixmap);
724 	if(_x.nextscreenpm != _x.screenpm)
725 		XFreePixmap(_x.display, _x.nextscreenpm);
726 	_x.nextscreenpm = pixmap;
727 	_x.screenr = r;
728 	_drawreplacescreenimage(m);
729 	return 1;
730 }