aboutsummaryrefslogtreecommitdiff
path: root/src/cmd/devdraw/x11-srv.c
blob: 2035a068178a41f431163d6cdfb2a6dd991782a2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
/*
 * Window system protocol server.
 * Use select and a single proc and single stack
 * to avoid aggravating the X11 library, which is
 * subtle and quick to anger.
 */

// #define SHOWEVENT

#include <u.h>
#include <sys/select.h>
#include <errno.h>
#ifdef SHOWEVENT
#include <stdio.h>
#endif
#include "x11-inc.h"

#include <libc.h>
#include <draw.h>
#include <memdraw.h>
#include <memlayer.h>
#include <keyboard.h>
#include <mouse.h>
#include <cursor.h>
#include <drawfcall.h>
#include "x11-memdraw.h"
#include "devdraw.h"

#undef time

#define MouseMask (\
	ButtonPressMask|\
	ButtonReleaseMask|\
	PointerMotionMask|\
	Button1MotionMask|\
	Button2MotionMask|\
	Button3MotionMask)

#define Mask MouseMask|ExposureMask|StructureNotifyMask|KeyPressMask|EnterWindowMask|LeaveWindowMask

typedef struct Kbdbuf Kbdbuf;
typedef struct Mousebuf Mousebuf;
typedef struct Fdbuf Fdbuf;
typedef struct Tagbuf Tagbuf;

struct Kbdbuf
{
	Rune r[32];
	int ri;
	int wi;
	int stall;
};

struct Mousebuf
{
	Mouse m[32];
	int ri;
	int wi;
	int stall;
	int resized;
};

struct Tagbuf
{
	int t[32];
	int ri;
	int wi;
};

struct Fdbuf
{
	uchar buf[2*MAXWMSG];
	uchar *rp;
	uchar *wp;
	uchar *ep;
};

Kbdbuf kbd;
Mousebuf mouse;
Fdbuf fdin;
Fdbuf fdout;
Tagbuf kbdtags;
Tagbuf mousetags;

void fdslide(Fdbuf*);
void runmsg(Wsysmsg*);
void replymsg(Wsysmsg*);
void runxevent(XEvent*);
void matchkbd(void);
void matchmouse(void);
int fdnoblock(int);

int chatty;
int drawsleep;
int fullscreen;

Rectangle windowrect;
Rectangle screenrect;

void
usage(void)
{
	fprint(2, "usage: devdraw (don't run directly)\n");
	exits("usage");
}

void
bell(void *v, char *msg)
{
	if(strcmp(msg, "alarm") == 0)
		drawsleep = drawsleep ? 0 : 1000;
	noted(NCONT);
}

void
main(int argc, char **argv)
{
	int n, top, firstx;
	fd_set rd, wr, xx;
	Wsysmsg m;
	XEvent event;

	/*
	 * Move the protocol off stdin/stdout so that
	 * any inadvertent prints don't screw things up.
	 */
	dup(0, 3);
	dup(1, 4);
	close(0);
	close(1);
	open("/dev/null", OREAD);
	open("/dev/null", OWRITE);

	/* reopens stdout if debugging */
	runxevent(0);

	fmtinstall('W', drawfcallfmt);

	ARGBEGIN{
	case 'D':
		chatty++;
		break;
	default:
		usage();
	}ARGEND

	/*
	 * Ignore arguments.  They're only for good ps -a listings.
	 */
	
	notify(bell);

	fdin.rp = fdin.wp = fdin.buf;
	fdin.ep = fdin.buf+sizeof fdin.buf;
	
	fdout.rp = fdout.wp = fdout.buf;
	fdout.ep = fdout.buf+sizeof fdout.buf;

	fdnoblock(3);
	fdnoblock(4);

	firstx = 1;
	_x.fd = -1;
	for(;;){
		/* set up file descriptors */
		FD_ZERO(&rd);
		FD_ZERO(&wr);
		FD_ZERO(&xx);
		/*
		 * Don't read unless there's room *and* we haven't
		 * already filled the output buffer too much.
		 */
		if(fdout.wp < fdout.buf+MAXWMSG && fdin.wp < fdin.ep)
			FD_SET(3, &rd);
		if(fdout.wp > fdout.rp)
			FD_SET(4, &wr);
		FD_SET(3, &xx);
		FD_SET(4, &xx);
		top = 4;
		if(_x.fd >= 0){
			if(firstx){
				firstx = 0;
				XSelectInput(_x.display, _x.drawable, Mask);
			}
			FD_SET(_x.fd, &rd);
			FD_SET(_x.fd, &xx);
			XFlush(_x.display);
			if(_x.fd > top)
				top = _x.fd;
		}

		if(chatty)
			fprint(2, "select %d...\n", top+1);
		/* wait for something to happen */
	    again:
		if(select(top+1, &rd, &wr, &xx, NULL) < 0){
			if(errno == EINTR)
				goto again;
			if(chatty)
				fprint(2, "select failure\n");
			exits(0);
		}
		if(chatty)
			fprint(2, "got select...\n");

		{
			/* read what we can */
			n = 1;
			while(fdin.wp < fdin.ep && (n = read(3, fdin.wp, fdin.ep-fdin.wp)) > 0)
				fdin.wp += n;
			if(n == 0){
				if(chatty)
					fprint(2, "eof\n");
				exits(0);
			}
			if(n < 0 && errno != EAGAIN)
				sysfatal("reading wsys msg: %r");

			/* pick off messages one by one */
			while((n = convM2W(fdin.rp, fdin.wp-fdin.rp, &m)) > 0){
				/* fprint(2, "<- %W\n", &m); */
				runmsg(&m);
				fdin.rp += n;
			}
			
			/* slide data to beginning of buf */
			fdslide(&fdin);
		}
		{
			/* write what we can */
			n = 1;
			while(fdout.rp < fdout.wp && (n = write(4, fdout.rp, fdout.wp-fdout.rp)) > 0)
				fdout.rp += n;
			if(n == 0)
				sysfatal("short write writing wsys");
			if(n < 0 && errno != EAGAIN)
				sysfatal("writing wsys msg: %r");

			/* slide data to beginning of buf */
			fdslide(&fdout);
		}
		{
			/*
			 * Read an X message if we can.
			 * (XPending actually calls select to make sure
			 * the display's fd is readable and then reads
			 * in any waiting data before declaring whether
			 * there are events on the queue.)
			 */
			while(XPending(_x.display)){
				XNextEvent(_x.display, &event);
				runxevent(&event);
			}
		}
	}
}

int
fdnoblock(int fd)
{
	return fcntl(fd, F_SETFL, fcntl(fd, F_GETFL)|O_NONBLOCK);
}

void
fdslide(Fdbuf *fb)
{
	int n;

	n = fb->wp - fb->rp;
	if(n > 0)
		memmove(fb->buf, fb->rp, n);
	fb->rp = fb->buf;
	fb->wp = fb->rp+n;
}

void
replyerror(Wsysmsg *m)
{
	char err[256];
	
	rerrstr(err, sizeof err);
	m->type = Rerror;
	m->error = err;
	replymsg(m);
}



/* 
 * Handle a single wsysmsg. 
 * Might queue for later (kbd, mouse read)
 */
void
runmsg(Wsysmsg *m)
{
	uchar buf[65536];
	int n;
	Memimage *i;
	
	switch(m->type){
	case Tinit:
		memimageinit();
		i = _xattach(m->label, m->winsize);
		_initdisplaymemimage(i);
		replymsg(m);
		break;

	case Trdmouse:
		mousetags.t[mousetags.wi++] = m->tag;
		if(mousetags.wi == nelem(mousetags.t))
			mousetags.wi = 0;
		if(mousetags.wi == mousetags.ri)
			sysfatal("too many queued mouse reads");
		/* fprint(2, "mouse unstall\n"); */
		mouse.stall = 0;
		matchmouse();
		break;

	case Trdkbd:
		kbdtags.t[kbdtags.wi++] = m->tag;
		if(kbdtags.wi == nelem(kbdtags.t))
			kbdtags.wi = 0;
		if(kbdtags.wi == kbdtags.ri)
			sysfatal("too many queued keyboard reads");
		kbd.stall = 0;
		matchkbd();
		break;

	case Tmoveto:
		_xmoveto(m->mouse.xy);
		replymsg(m);
		break;

	case Tcursor:
		if(m->arrowcursor)
			_xsetcursor(nil);
		else
			_xsetcursor(&m->cursor);
		replymsg(m);
		break;
			
	case Tbouncemouse:
		_xbouncemouse(&m->mouse);
		replymsg(m);
		break;

	case Tlabel:
		_xsetlabel(m->label);
		replymsg(m);
		break;

	case Trdsnarf:
		m->snarf = _xgetsnarf();
		replymsg(m);
		free(m->snarf);
		break;

	case Twrsnarf:
		_xputsnarf(m->snarf);
		replymsg(m);
		break;

	case Trddraw:
		n = m->count;
		if(n > sizeof buf)
			n = sizeof buf;
		n = _drawmsgread(buf, n);
		if(n < 0)
			replyerror(m);
		else{
			m->count = n;
			m->data = buf;
			replymsg(m);
		}
		break;

	case Twrdraw:
		if(_drawmsgwrite(m->data, m->count) < 0)
			replyerror(m);
		else
			replymsg(m);
		break;
	
	case Ttop:
		_xtopwindow();
		replymsg(m);
		break;
	
	case Tresize:
		_xresizewindow(m->rect);
		replymsg(m);
		break;
	}
}

/*
 * Reply to m.
 */
void
replymsg(Wsysmsg *m)
{
	int n;

	/* T -> R msg */
	if(m->type%2 == 0)
		m->type++;
		
	/* fprint(2, "-> %W\n", m); */
	/* copy to output buffer */
	n = sizeW2M(m);
	if(fdout.wp+n > fdout.ep)
		sysfatal("out of space for reply message");
	convW2M(m, fdout.wp, n);
	fdout.wp += n;
}

/*
 * Match queued kbd reads with queued kbd characters.
 */
void
matchkbd(void)
{
	Wsysmsg m;
	
	if(kbd.stall)
		return;
	while(kbd.ri != kbd.wi && kbdtags.ri != kbdtags.wi){
		m.type = Rrdkbd;
		m.tag = kbdtags.t[kbdtags.ri++];
		if(kbdtags.ri == nelem(kbdtags.t))
			kbdtags.ri = 0;
		m.rune = kbd.r[kbd.ri++];
		if(kbd.ri == nelem(kbd.r))
			kbd.ri = 0;
		replymsg(&m);
	}
}

/*
 * Match queued mouse reads with queued mouse events.
 */
void
matchmouse(void)
{
	Wsysmsg m;
	
	while(mouse.ri != mouse.wi && mousetags.ri != mousetags.wi){
		m.type = Rrdmouse;
		m.tag = mousetags.t[mousetags.ri++];
		if(mousetags.ri == nelem(mousetags.t))
			mousetags.ri = 0;
		m.mouse = mouse.m[mouse.ri];
		m.resized = mouse.resized;
		/*
		if(m.resized)
			fprint(2, "sending resize\n");
		*/
		mouse.resized = 0;
		mouse.ri++;
		if(mouse.ri == nelem(mouse.m))
			mouse.ri = 0;
		replymsg(&m);
	}
}

/*
 * Handle an incoming X event.
 */
void
runxevent(XEvent *xev)
{
	int c;
	KeySym k;
	static Mouse m;

#ifdef SHOWEVENT
	static int first = 1;
	if(first){
		dup(create("/tmp/devdraw.out", OWRITE, 0666), 1);
		setbuf(stdout, 0);
		first = 0;
	}
#endif

	if(xev == 0)
		return;

#ifdef SHOWEVENT
	print("\n");
	ShowEvent(xev);
#endif

	switch(xev->type){
	case Expose:
		_xexpose(xev);
		break;
	
	case DestroyNotify:
		if(_xdestroy(xev))
			exits(0);
		break;

	case ConfigureNotify:
		if(_xconfigure(xev)){
			mouse.resized = 1;
			_xreplacescreenimage();
			goto addmouse;
		}
		break;

	case ButtonPress:
	case ButtonRelease:
	case MotionNotify:
		if(mouse.stall)
			return;
		if(_xtoplan9mouse(xev, &m) < 0)
			return;
	addmouse:
		mouse.m[mouse.wi] = m;
		mouse.wi++;
		if(mouse.wi == nelem(mouse.m))
			mouse.wi = 0;
		if(mouse.wi == mouse.ri){
			mouse.stall = 1;
			mouse.ri = 0;
			mouse.wi = 1;
			mouse.m[0] = m;
			/* fprint(2, "mouse stall\n"); */
		}
		matchmouse();
		break;
	
	case KeyPress:
		if(kbd.stall)
			return;
		XLookupString((XKeyEvent*)xev, NULL, 0, &k, NULL);
		if(k == XK_F11){
			fullscreen = !fullscreen;
			_xmovewindow(fullscreen ? screenrect : windowrect);
			return;
		}
		if((c = _xtoplan9kbd(xev)) < 0)
			return;
		kbd.r[kbd.wi++] = c;
		if(kbd.wi == nelem(kbd.r))
			kbd.wi = 0;
		if(kbd.ri == kbd.wi)
			kbd.stall = 1;
		matchkbd();
		break;
	
	case SelectionRequest:
		_xselect(xev);
		break;
	}
}