summaryrefslogtreecommitdiffstats
path: root/x11vnc/xinerama.c
blob: 0d2ca71f296f7fc8e07302d655de6329f83832c5 (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
558
559
560
561
562
563
/*
   Copyright (C) 2002-2010 Karl J. Runge <runge@karlrunge.com> 
   All rights reserved.

This file is part of x11vnc.

x11vnc is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at
your option) any later version.

x11vnc is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with x11vnc; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA
or see <http://www.gnu.org/licenses/>.

In addition, as a special exception, Karl J. Runge
gives permission to link the code of its release of x11vnc with the
OpenSSL project's "OpenSSL" library (or with modified versions of it
that use the same license as the "OpenSSL" library), and distribute
the linked executables.  You must obey the GNU General Public License
in all respects for all of the code used other than "OpenSSL".  If you
modify this file, you may extend this exception to your version of the
file, but you are not obligated to do so.  If you do not wish to do
so, delete this exception statement from your version.
*/

/* -- xinerama.c -- */

#include "x11vnc.h"
#include "xwrappers.h"
#include "blackout_t.h"
#include "scan.h"

/*
 * routines related to xinerama and blacking out rectangles
 */

/* blacked-out region (-blackout, -xinerama) */

#define BLACKR_MAX 100
blackout_t blackr[BLACKR_MAX];	/* hardwired max blackouts */
tile_blackout_t *tile_blackout;
int blackouts = 0;

void initialize_blackouts_and_xinerama(void);
void push_sleep(int n);
void push_black_screen(int n);
void refresh_screen(int push);
void zero_fb(int x1, int y1, int x2, int y2);


static void initialize_blackouts(char *list);
static void blackout_tiles(void);
static void initialize_xinerama (void);


/*
 * Take a comma separated list of geometries: WxH+X+Y and register them as
 * rectangles to black out from the screen.
 */
static void initialize_blackouts(char *list) {
	char *p, *blist = strdup(list);
	int x, y, X, Y, h, w, t;

	p = strtok(blist, ", \t");
	while (p) {
		if (!strcmp("noptr", p)) {
			blackout_ptr = 1;
			rfbLog("pointer will be blocked from blackout "
			    "regions\n");
			p = strtok(NULL, ", \t");
			continue;
		}
		if (! parse_geom(p, &w, &h, &x, &y, dpy_x, dpy_y)) {
			if (*p != '\0') {
				rfbLog("skipping invalid geometry: %s\n", p);
			}
			p = strtok(NULL, ", \t");
			continue;
		}
		w = nabs(w);
		h = nabs(h);
		x = nfix(x, dpy_x);
		y = nfix(y, dpy_y);
		X = x + w;
		Y = y + h;
		X = nfix(X, dpy_x+1);
		Y = nfix(Y, dpy_y+1);
		if (x > X) {
			t = X; X = x; x = t;
		}
		if (y > Y) {
			t = Y; Y = y; y = t;
		}

		/* take clipping region into account */
		x = nfix(x - coff_x, wdpy_x);
		X = nfix(X - coff_x, wdpy_x);
		y = nfix(y - coff_y, wdpy_y);
		Y = nfix(Y - coff_y, wdpy_y);

		if (x < 0 || x > dpy_x || y < 0 || y > dpy_y ||
		    X < 0 || X > dpy_x || Y < 0 || Y > dpy_y ||
		    x == X || y == Y) {
			rfbLog("skipping invalid blackout geometry: %s x="
			    "%d-%d,y=%d-%d,w=%d,h=%d\n", p, x, X, y, Y, w, h);
		} else {
			rfbLog("blackout rect: %s: x=%d-%d y=%d-%d\n", p,
			    x, X, y, Y);

			/*
			 * note that the black out is x1 <= x but x < x2
			 * for the region. i.e. the x2, y2 are outside
			 * by 1 pixel. 
			 */
			blackr[blackouts].x1 = x;
			blackr[blackouts].y1 = y;
			blackr[blackouts].x2 = X;
			blackr[blackouts].y2 = Y;
			blackouts++;
			if (blackouts >= BLACKR_MAX) {
				rfbLog("too many blackouts: %d\n", blackouts);
				break;
			}
		}
		p = strtok(NULL, ", \t");
	}
	free(blist);
}

/*
 * Now that all blackout rectangles have been constructed, see what overlap
 * they have with the tiles in the system.  If a tile is touched by a
 * blackout, record information.
 */
static void blackout_tiles(void) {
	int tx, ty;
	int debug_bo = 0;
	if (! blackouts) {
		return;
	}
	if (getenv("DEBUG_BLACKOUT") != NULL) {
		debug_bo = 1;
	}

	/* 
	 * to simplify things drop down to single copy mode, etc...
	 */
	single_copytile = 1;
	/* loop over all tiles. */
	for (ty=0; ty < ntiles_y; ty++) {
		for (tx=0; tx < ntiles_x; tx++) {
			sraRegionPtr tile_reg, black_reg;
			sraRect rect;
			sraRectangleIterator *iter;
			int n, b, x1, y1, x2, y2, cnt;

			/* tile number and coordinates: */
			n = tx + ty * ntiles_x;
			x1 = tx * tile_x;
			y1 = ty * tile_y;
			x2 = x1 + tile_x;
			y2 = y1 + tile_y;
			if (x2 > dpy_x) {
				x2 = dpy_x;
			}
			if (y2 > dpy_y) {
				y2 = dpy_y;
			}

			/* make regions for the tile and the blackouts: */
			black_reg = (sraRegionPtr) sraRgnCreate();
			tile_reg  = (sraRegionPtr) sraRgnCreateRect(x1, y1,
			    x2, y2);

			tile_blackout[n].cover = 0;
			tile_blackout[n].count = 0;

			/* union of blackouts */
			for (b=0; b < blackouts; b++) {
				sraRegionPtr tmp_reg = (sraRegionPtr)
				    sraRgnCreateRect(blackr[b].x1,
				    blackr[b].y1, blackr[b].x2, blackr[b].y2);

				sraRgnOr(black_reg, tmp_reg);
				sraRgnDestroy(tmp_reg);
			}

			if (! sraRgnAnd(black_reg, tile_reg)) {
				/*
				 * no intersection for this tile, so we
				 * are done.
				 */
				sraRgnDestroy(black_reg);
				sraRgnDestroy(tile_reg);
				continue;
			}

			/*
			 * loop over rectangles that make up the blackout
			 * region:
			 */
			cnt = 0;
			iter = sraRgnGetIterator(black_reg);
			while (sraRgnIteratorNext(iter, &rect)) {

				/* make sure x1 < x2 and y1 < y2 */
				if (rect.x1 > rect.x2) {
					int tmp = rect.x2;
					rect.x2 = rect.x1;
					rect.x1 = tmp;
				}
				if (rect.y1 > rect.y2) {
					int tmp = rect.y2;
					rect.y2 = rect.y1;
					rect.y1 = tmp;
				}

				/* store coordinates */
				tile_blackout[n].bo[cnt].x1 = rect.x1;
				tile_blackout[n].bo[cnt].y1 = rect.y1;
				tile_blackout[n].bo[cnt].x2 = rect.x2;
				tile_blackout[n].bo[cnt].y2 = rect.y2;

				/* note if the tile is completely obscured */
				if (rect.x1 == x1 && rect.y1 == y1 &&
				    rect.x2 == x2 && rect.y2 == y2) {
					tile_blackout[n].cover = 2;
					if (debug_bo) {
 						fprintf(stderr, "full: %d=%d,%d"
						    "  (%d-%d)  (%d-%d)\n",
						    n, tx, ty, x1, x2, y1, y2);
					}
				} else {
					tile_blackout[n].cover = 1;
					if (debug_bo) {
						fprintf(stderr, "part: %d=%d,%d"
						    "  (%d-%d)  (%d-%d)\n",
						    n, tx, ty, x1, x2, y1, y2);
					}
				}

				if (++cnt >= BO_MAX) {
					rfbLog("too many blackout rectangles "
					    "for tile %d=%d,%d.\n", n, tx, ty);
					break;
				}
			}
			sraRgnReleaseIterator(iter);

			sraRgnDestroy(black_reg);
			sraRgnDestroy(tile_reg);

			tile_blackout[n].count = cnt;
			if (debug_bo && cnt > 1) {
 				rfbLog("warning: multiple region overlaps[%d] "
				    "for tile %d=%d,%d.\n", cnt, n, tx, ty);
			}
		}
	}
}

static int did_xinerama_clip = 0;

void check_xinerama_clip(void) {
#if LIBVNCSERVER_HAVE_LIBXINERAMA
	int n, k, i, ev, er, juse = -1;
	int score[32], is = 0;
	XineramaScreenInfo *x;

	if (!clip_str || !dpy) {
		return;
	}
	if (sscanf(clip_str, "xinerama%d", &k) == 1) {
		;
	} else if (sscanf(clip_str, "screen%d", &k) == 1) {
		;
	} else {
		return;
	}

	free(clip_str);
	clip_str = NULL;

	if (! XineramaQueryExtension(dpy, &ev, &er)) {
		return;
	}
	if (! XineramaIsActive(dpy)) {
		return;
	}
	x = XineramaQueryScreens(dpy, &n);
	if (k < 0 || k >= n) {
		XFree_wr(x);
		return;
	}
	for (i=0; i < n; i++) {
		score[is++] = nabs(x[i].x_org) + nabs(x[i].y_org);
		if (is >= 32) {
			break;
		}
	}
	for (i=0; i <= k; i++) {
		int j, jmon = 0, mon = -1, mox = -1;
		for (j=0; j < is; j++) {
			if (mon < 0 || score[j] < mon) {
				mon = score[j];
				jmon = j;
			}
			if (mox < 0 || score[j] > mox) {
				mox = score[j];
			}
		}
		juse = jmon;
		score[juse] = mox+1+i;
	}

	if (juse >= 0 && juse < n) {
		char str[64];
		sprintf(str, "%dx%d+%d+%d", x[juse].width, x[juse].height,
		    x[juse].x_org, x[juse].y_org);
		clip_str = strdup(str);
		did_xinerama_clip = 1;
	} else {
		clip_str = strdup("");
	}
	XFree_wr(x);
	if (!quiet) {
		rfbLog("set -clip to '%s' for xinerama%d\n", clip_str, k);
	}
#endif
}

static void initialize_xinerama (void) {
#if !LIBVNCSERVER_HAVE_LIBXINERAMA
	if (!raw_fb_str) {
		rfbLog("Xinerama: Library libXinerama is not available to determine\n");
		rfbLog("Xinerama: the head geometries, consider using -blackout\n");
		rfbLog("Xinerama: if the screen is non-rectangular.\n");
	}
#else
	XineramaScreenInfo *sc, *xineramas;
	sraRegionPtr black_region, tmp_region;
	sraRectangleIterator *iter;
	sraRect rect;
	char *bstr, *tstr;
	int ev, er, i, n, rcnt;

	RAWFB_RET_VOID

	X_LOCK;
	if (! XineramaQueryExtension(dpy, &ev, &er)) {
		if (verbose) {
			rfbLog("Xinerama: disabling: display does not support it.\n");
		}
		xinerama = 0;
		xinerama_present = 0;
		X_UNLOCK;
		return;
	}
	if (! XineramaIsActive(dpy)) {
		/* n.b. change to XineramaActive(dpy, window) someday */
		if (verbose) {
			rfbLog("Xinerama: disabling: not active on display.\n");
		}
		xinerama = 0;
		xinerama_present = 0;
		X_UNLOCK;
		return;
	}
	xinerama_present = 1;
	rfbLog("\n");
	rfbLog("Xinerama is present and active (e.g. multi-head).\n");

	/* n.b. change to XineramaGetData() someday */
	xineramas = XineramaQueryScreens(dpy, &n);
	rfbLog("Xinerama: number of sub-screens: %d\n", n);

	if (! use_xwarppointer && ! got_noxwarppointer && n > 1) {
		rfbLog("Xinerama: enabling -xwarppointer mode to try to correct\n");
		rfbLog("Xinerama: mouse pointer motion. XTEST+XINERAMA bug.\n");
		rfbLog("Xinerama: Use -noxwarppointer to force XTEST.\n");
		use_xwarppointer = 1;
	}

	if (n == 1) {
		rfbLog("Xinerama: no blackouts needed (only one sub-screen)\n");
		rfbLog("\n");
		XFree_wr(xineramas);
		X_UNLOCK;
		return;		/* must be OK w/o change */
	}

	black_region = sraRgnCreateRect(0, 0, dpy_x, dpy_y);

	sc = xineramas;
	for (i=0; i<n; i++) {
		int x, y, w, h;
		
		x = sc->x_org;
		y = sc->y_org;
		w = sc->width;
		h = sc->height;

		rfbLog("Xinerama: sub-screen[%d]  %dx%d+%d+%d\n", i, w, h, x, y);

		tmp_region = sraRgnCreateRect(x, y, x + w, y + h);

		sraRgnSubtract(black_region, tmp_region);
		sraRgnDestroy(tmp_region);
		sc++;
	}
	XFree_wr(xineramas);
	X_UNLOCK;


	if (sraRgnEmpty(black_region)) {
		rfbLog("Xinerama: no blackouts needed (screen fills"
		    " rectangle)\n");
		rfbLog("\n");
		sraRgnDestroy(black_region);
		return;
	}
	if (did_xinerama_clip) {
		rfbLog("Xinerama: no blackouts due to -clip xinerama.\n");
		return;
	}

	/* max len is 10000x10000+10000+10000 (23 chars) per geometry */
	rcnt = (int) sraRgnCountRects(black_region);
	bstr = (char *) malloc(30 * (rcnt+1));
	tstr = (char *) malloc(30);
	bstr[0] = '\0';

	iter = sraRgnGetIterator(black_region);
	while (sraRgnIteratorNext(iter, &rect)) {
		int x, y, w, h;

		/* make sure x1 < x2 and y1 < y2 */
		if (rect.x1 > rect.x2) {
			int tmp = rect.x2;
			rect.x2 = rect.x1;
			rect.x1 = tmp;
		}
		if (rect.y1 > rect.y2) {
			int tmp = rect.y2;
			rect.y2 = rect.y1;
			rect.y1 = tmp;
		}
		x = rect.x1;
		y = rect.y1;
		w = rect.x2 - x;
		h = rect.y2 - y;
		sprintf(tstr, "%dx%d+%d+%d,", w, h, x, y);
		strcat(bstr, tstr);
	}
	sraRgnReleaseIterator(iter);
	initialize_blackouts(bstr);
	rfbLog("\n");

	free(bstr);
	free(tstr);
#endif
}

void initialize_blackouts_and_xinerama(void) {

	blackouts = 0;
	blackout_ptr = 0;

	if (blackout_str != NULL) {
		initialize_blackouts(blackout_str);
	}
	if (xinerama) {
		initialize_xinerama();
	}
	if (blackouts) {
		blackout_tiles();
		/* schedule a copy_screen(), now is too early. */
		do_copy_screen = 1;
	}
}

void push_sleep(int n) {
	int i;
	for (i=0; i<n; i++) {
		rfbPE(-1);
		if (i != n-1 && defer_update) {
			usleep(defer_update * 1000);
		}
	}
}

/*
 * try to forcefully push a black screen to all connected clients
 */
void push_black_screen(int n) {
	int Lx = dpy_x, Ly = dpy_y;
	if (!screen) {
		return;
	}
#ifndef NO_NCACHE
	if (ncache > 0) {
		Ly = dpy_y * (1+ncache);
	}
#endif
	zero_fb(0, 0, Lx, Ly);
	mark_rect_as_modified(0, 0, Lx, Ly, 0);
	push_sleep(n);
}

void refresh_screen(int push) {
	int i;
	if (!screen) {
		return;
	}
	mark_rect_as_modified(0, 0, dpy_x, dpy_y, 0);
	for (i=0; i<push; i++) {
		rfbPE(-1);
	}
}

/*
 * Fill the framebuffer with zero for the prescribed rectangle
 */
void zero_fb(int x1, int y1, int x2, int y2) {
	int pixelsize = bpp/8;
	int line, fill = 0, yfac = 1;
	char *dst;

#ifndef NO_NCACHE
	if (ncache > 0) {
		yfac = 1+ncache;
		if (ncache_xrootpmap) {
			yfac++;
		}
	}
#endif
	
	if (x1 < 0 || x2 <= x1 || x2 > dpy_x) {
		return;
	}
	if (y1 < 0 || y2 <= y1 || y2 > yfac * dpy_y) {
		return;
	}
	if (! main_fb) {
		return;
	}

	dst = main_fb + y1 * main_bytes_per_line + x1 * pixelsize;
	line = y1;
	while (line++ < y2) {
		memset(dst, fill, (size_t) (x2 - x1) * pixelsize);
		dst += main_bytes_per_line;
	}
}