summaryrefslogtreecommitdiff
path: root/src/cairo-xlib-display.c
blob: c505db4d10b68d423c457566ea85dc9a2f8e314f (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
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
/* Cairo - a vector graphics library with display and print output
 *
 * Copyright © 2007 Chris Wilson
 *
 * This library is free software; you can redistribute it and/or
 * modify it either under the terms of the GNU Lesser General Public
 * License version 2.1 as published by the Free Software Foundation
 * (the "LGPL") or, at your option, under the terms of the Mozilla
 * Public License Version 1.1 (the "MPL"). If you do not alter this
 * notice, a recipient may use your version of this file under either
 * the MPL or the LGPL.
 *
 * You should have received a copy of the LGPL along with this library
 * in the file COPYING-LGPL-2.1; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
 * You should have received a copy of the MPL along with this library
 * in the file COPYING-MPL-1.1
 *
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
 * OF ANY KIND, either express or implied. See the LGPL or the MPL for
 * the specific language governing rights and limitations.
 *
 * The Original Code is the cairo graphics library.
 *
 * The Initial Developer of the Original Code is Chris Wilson.
 *
 * Contributor(s):
 *	Karl Tomlinson <karlt+@karlt.net>, Mozilla Corporation
 */

#include "cairoint.h"

#if !CAIRO_HAS_XLIB_XCB_FUNCTIONS

#include "cairo-xlib-private.h"
#include "cairo-xlib-xrender-private.h"
#include "cairo-freelist-private.h"
#include "cairo-error-private.h"
#include "cairo-list-inline.h"

#include <X11/Xlibint.h>	/* For XESetCloseDisplay */

typedef int (*cairo_xlib_error_func_t) (Display     *display,
					XErrorEvent *event);

static cairo_xlib_display_t *_cairo_xlib_display_list;

static int
_noop_error_handler (Display     *display,
		     XErrorEvent *event)
{
    return False;		/* return value is ignored */
}

static void
_cairo_xlib_display_finish (void *abstract_display)
{
    cairo_xlib_display_t *display = abstract_display;
    Display *dpy = display->display;

    _cairo_xlib_display_fini_shm (display);

    if (! cairo_device_acquire (&display->base)) {
	cairo_xlib_error_func_t old_handler;

	/* protect the notifies from triggering XErrors */
	XSync (dpy, False);
	old_handler = XSetErrorHandler (_noop_error_handler);

	while (! cairo_list_is_empty (&display->fonts)) {
	    _cairo_xlib_font_close (cairo_list_first_entry (&display->fonts,
							    cairo_xlib_font_t,
							    link));
	}

	while (! cairo_list_is_empty (&display->screens)) {
	    _cairo_xlib_screen_destroy (display,
					cairo_list_first_entry (&display->screens,
								cairo_xlib_screen_t,
								link));
	}

	XSync (dpy, False);
	XSetErrorHandler (old_handler);

	cairo_device_release (&display->base);
    }
}

static void
_cairo_xlib_display_destroy (void *abstract_display)
{
    cairo_xlib_display_t *display = abstract_display;

    free (display);
}

static int
_cairo_xlib_close_display (Display *dpy, XExtCodes *codes)
{
    cairo_xlib_display_t *display, **prev, *next;

    CAIRO_MUTEX_LOCK (_cairo_xlib_display_mutex);
    for (display = _cairo_xlib_display_list; display; display = display->next)
	if (display->display == dpy)
	    break;
    CAIRO_MUTEX_UNLOCK (_cairo_xlib_display_mutex);
    if (display == NULL)
	return 0;

    cairo_device_finish (&display->base);

    /*
     * Unhook from the global list
     */
    CAIRO_MUTEX_LOCK (_cairo_xlib_display_mutex);
    prev = &_cairo_xlib_display_list;
    for (display = _cairo_xlib_display_list; display; display = next) {
	next = display->next;
	if (display->display == dpy) {
	    *prev = next;
	    break;
	} else
	    prev = &display->next;
    }
    CAIRO_MUTEX_UNLOCK (_cairo_xlib_display_mutex);

    display->display = NULL; /* catch any later invalid access */
    cairo_device_destroy (&display->base);

    /* Return value in accordance with requirements of
     * XESetCloseDisplay */
    return 0;
}

static const cairo_device_backend_t _cairo_xlib_device_backend = {
    CAIRO_DEVICE_TYPE_XLIB,

    NULL,
    NULL,

    NULL, /* flush */
    _cairo_xlib_display_finish,
    _cairo_xlib_display_destroy,
};

static void _cairo_xlib_display_select_compositor (cairo_xlib_display_t *display)
{
#if 1
    if (display->render_major > 0 || display->render_minor >= 4)
	display->compositor = _cairo_xlib_traps_compositor_get ();
    else if (display->render_major > 0 || display->render_minor >= 0)
	display->compositor = _cairo_xlib_mask_compositor_get ();
    else
	display->compositor = _cairo_xlib_core_compositor_get ();
#else
    display->compositor = _cairo_xlib_fallback_compositor_get ();
#endif
}

/**
 * _cairo_xlib_device_create:
 * @dpy: the display to create the device for
 *
 * Gets the device belonging to @dpy, or creates it if it doesn't exist yet.
 *
 * Returns: the device belonging to @dpy
 **/
cairo_device_t *
_cairo_xlib_device_create (Display *dpy)
{
    cairo_xlib_display_t *display;
    cairo_xlib_display_t **prev;
    cairo_device_t *device;
    XExtCodes *codes;
    const char *env;

    CAIRO_MUTEX_INITIALIZE ();

    /* There is an apparent deadlock between this mutex and the
     * mutex for the display, but it's actually safe. For the
     * app to call XCloseDisplay() while any other thread is
     * inside this function would be an error in the logic
     * app, and the CloseDisplay hook is the only other place we
     * acquire this mutex.
     */
    CAIRO_MUTEX_LOCK (_cairo_xlib_display_mutex);

    for (prev = &_cairo_xlib_display_list; (display = *prev); prev = &(*prev)->next)
    {
	if (display->display == dpy) {
	    /*
	     * MRU the list
	     */
	    if (prev != &_cairo_xlib_display_list) {
		*prev = display->next;
		display->next = _cairo_xlib_display_list;
		_cairo_xlib_display_list = display;
	    }
            device = cairo_device_reference (&display->base);
	    goto UNLOCK;
	}
    }

    display = malloc (sizeof (cairo_xlib_display_t));
    if (unlikely (display == NULL)) {
	device = _cairo_device_create_in_error (CAIRO_STATUS_NO_MEMORY);
	goto UNLOCK;
    }

    _cairo_device_init (&display->base, &_cairo_xlib_device_backend);

    display->display = dpy;
    cairo_list_init (&display->screens);
    cairo_list_init (&display->fonts);
    display->closed = FALSE;

    /* Xlib calls out to the extension close_display hooks in LIFO
     * order. So we have to ensure that all extensions that we depend
     * on in our close_display hook are properly initialized before we
     * add our hook. For now, that means Render, so we call into its
     * QueryVersion function to ensure it gets initialized.
     */
    display->render_major = display->render_minor = -1;
    XRenderQueryVersion (dpy, &display->render_major, &display->render_minor);
    env = getenv ("CAIRO_DEBUG");
    if (env != NULL && (env = strstr (env, "xrender-version=")) != NULL) {
	int max_render_major, max_render_minor;

	env += sizeof ("xrender-version=") - 1;
	if (sscanf (env, "%d.%d", &max_render_major, &max_render_minor) != 2)
	    max_render_major = max_render_minor = -1;

	if (max_render_major < display->render_major ||
	    (max_render_major == display->render_major &&
	     max_render_minor < display->render_minor))
	{
	    display->render_major = max_render_major;
	    display->render_minor = max_render_minor;
	}
    }

    _cairo_xlib_display_select_compositor (display);

    display->white = NULL;
    memset (display->alpha, 0, sizeof (display->alpha));
    memset (display->solid, 0, sizeof (display->solid));
    memset (display->solid_cache, 0, sizeof (display->solid_cache));
    memset (display->last_solid_cache, 0, sizeof (display->last_solid_cache));

    memset (display->cached_xrender_formats, 0,
	    sizeof (display->cached_xrender_formats));

    display->force_precision = -1;

    _cairo_xlib_display_init_shm (display);

    /* Prior to Render 0.10, there is no protocol support for gradients and
     * we call function stubs instead, which would silently consume the drawing.
     */
#if RENDER_MAJOR == 0 && RENDER_MINOR < 10
    display->buggy_gradients = TRUE;
#else
    display->buggy_gradients = FALSE;
#endif
    display->buggy_pad_reflect = FALSE;
    display->buggy_repeat = FALSE;

    /* This buggy_repeat condition is very complicated because there
     * are multiple X server code bases (with multiple versioning
     * schemes within a code base), and multiple bugs.
     *
     * The X servers:
     *
     *    1. The Vendor=="XFree86" code base with release numbers such
     *    as 4.7.0 (VendorRelease==40700000).
     *
     *    2. The Vendor=="X.Org" code base (a descendant of the
     *    XFree86 code base). It originally had things like
     *    VendorRelease==60700000 for release 6.7.0 but then changed
     *    its versioning scheme so that, for example,
     *    VendorRelease==10400000 for the 1.4.0 X server within the
     *    X.Org 7.3 release.
     *
     * The bugs:
     *
     *    1. The original bug that led to the buggy_repeat
     *    workaround. This was a bug that Owen Taylor investigated,
     *    understood well, and characterized against carious X
     *    servers. Confirmed X servers with this bug include:
     *
     *		"XFree86" <= 40500000
     *		"X.Org" <= 60802000 (only with old numbering >= 60700000)
     *
     *    2. A separate bug resulting in a crash of the X server when
     *    using cairo's extend-reflect test case, (which, surprisingly
     *    enough was not passing RepeatReflect to the X server, but
     *    instead using RepeatNormal in a workaround). Nobody to date
     *    has understood the bug well, but it appears to be gone as of
     *    the X.Org 1.4.0 server. This bug is coincidentally avoided
     *    by using the same buggy_repeat workaround. Confirmed X
     *    servers with this bug include:
     *
     *		"X.org" == 60900000 (old versioning scheme)
     *		"X.org"  < 10400000 (new numbering scheme)
     *
     *    For the old-versioning-scheme X servers we don't know
     *    exactly when second the bug started, but since bug 1 is
     *    present through 6.8.2 and bug 2 is present in 6.9.0 it seems
     *    safest to just blacklist all old-versioning-scheme X servers,
     *    (just using VendorRelease < 70000000), as buggy_repeat=TRUE.
     */
    if (_cairo_xlib_vendor_is_xorg (dpy)) {
	if (VendorRelease (dpy) >= 60700000) {
	    if (VendorRelease (dpy) < 70000000)
		display->buggy_repeat = TRUE;

	    /* We know that gradients simply do not work in early Xorg servers */
	    if (VendorRelease (dpy) < 70200000)
		display->buggy_gradients = TRUE;

	    /* And the extended repeat modes were not fixed until much later */
	    display->buggy_pad_reflect = TRUE;
	} else {
	    if (VendorRelease (dpy) < 10400000)
		display->buggy_repeat = TRUE;

	    /* Too many bugs in the early drivers */
	    if (VendorRelease (dpy) < 10699000)
		display->buggy_pad_reflect = TRUE;
	}
    } else if (strstr (ServerVendor (dpy), "XFree86") != NULL) {
	if (VendorRelease (dpy) <= 40500000)
	    display->buggy_repeat = TRUE;

	display->buggy_gradients = TRUE;
	display->buggy_pad_reflect = TRUE;
    }

    codes = XAddExtension (dpy);
    if (unlikely (codes == NULL)) {
	device = _cairo_device_create_in_error (CAIRO_STATUS_NO_MEMORY);
	free (display);
	goto UNLOCK;
    }

    XESetCloseDisplay (dpy, codes->extension, _cairo_xlib_close_display);
    cairo_device_reference (&display->base); /* add one for the CloseDisplay */

    display->next = _cairo_xlib_display_list;
    _cairo_xlib_display_list = display;

    device = &display->base;

UNLOCK:
    CAIRO_MUTEX_UNLOCK (_cairo_xlib_display_mutex);
    return device;
}

cairo_status_t
_cairo_xlib_display_acquire (cairo_device_t *device, cairo_xlib_display_t **display)
{
    cairo_status_t status;

    status = cairo_device_acquire (device);
    if (status)
        return status;

    *display = (cairo_xlib_display_t *) device;
    return CAIRO_STATUS_SUCCESS;
}

XRenderPictFormat *
_cairo_xlib_display_get_xrender_format_for_pixman(cairo_xlib_display_t *display,
						  pixman_format_code_t format)
{
    Display *dpy = display->display;
    XRenderPictFormat tmpl;
    int mask;

#define MASK(x) ((1<<(x))-1)

    tmpl.depth = PIXMAN_FORMAT_DEPTH(format);
    mask = PictFormatType | PictFormatDepth;

    switch (PIXMAN_FORMAT_TYPE(format)) {
    case PIXMAN_TYPE_ARGB:
	tmpl.type = PictTypeDirect;

	tmpl.direct.alphaMask = MASK(PIXMAN_FORMAT_A(format));
	if (PIXMAN_FORMAT_A(format))
	    tmpl.direct.alpha = (PIXMAN_FORMAT_R(format) +
				 PIXMAN_FORMAT_G(format) +
				 PIXMAN_FORMAT_B(format));

	tmpl.direct.redMask = MASK(PIXMAN_FORMAT_R(format));
	tmpl.direct.red = (PIXMAN_FORMAT_G(format) +
			   PIXMAN_FORMAT_B(format));

	tmpl.direct.greenMask = MASK(PIXMAN_FORMAT_G(format));
	tmpl.direct.green = PIXMAN_FORMAT_B(format);

	tmpl.direct.blueMask = MASK(PIXMAN_FORMAT_B(format));
	tmpl.direct.blue = 0;

	mask |= PictFormatRed | PictFormatRedMask;
	mask |= PictFormatGreen | PictFormatGreenMask;
	mask |= PictFormatBlue | PictFormatBlueMask;
	mask |= PictFormatAlpha | PictFormatAlphaMask;
	break;

    case PIXMAN_TYPE_ABGR:
	tmpl.type = PictTypeDirect;

	tmpl.direct.alphaMask = MASK(PIXMAN_FORMAT_A(format));
	if (tmpl.direct.alphaMask)
	    tmpl.direct.alpha = (PIXMAN_FORMAT_B(format) +
				 PIXMAN_FORMAT_G(format) +
				 PIXMAN_FORMAT_R(format));

	tmpl.direct.blueMask = MASK(PIXMAN_FORMAT_B(format));
	tmpl.direct.blue = (PIXMAN_FORMAT_G(format) +
			    PIXMAN_FORMAT_R(format));

	tmpl.direct.greenMask = MASK(PIXMAN_FORMAT_G(format));
	tmpl.direct.green = PIXMAN_FORMAT_R(format);

	tmpl.direct.redMask = MASK(PIXMAN_FORMAT_R(format));
	tmpl.direct.red = 0;

	mask |= PictFormatRed | PictFormatRedMask;
	mask |= PictFormatGreen | PictFormatGreenMask;
	mask |= PictFormatBlue | PictFormatBlueMask;
	mask |= PictFormatAlpha | PictFormatAlphaMask;
	break;

    case PIXMAN_TYPE_BGRA:
	tmpl.type = PictTypeDirect;

	tmpl.direct.blueMask = MASK(PIXMAN_FORMAT_B(format));
	tmpl.direct.blue = (PIXMAN_FORMAT_BPP(format) - PIXMAN_FORMAT_B(format));

	tmpl.direct.greenMask = MASK(PIXMAN_FORMAT_G(format));
	tmpl.direct.green = (PIXMAN_FORMAT_BPP(format) - PIXMAN_FORMAT_B(format) -
			     PIXMAN_FORMAT_G(format));

	tmpl.direct.redMask = MASK(PIXMAN_FORMAT_R(format));
	tmpl.direct.red = (PIXMAN_FORMAT_BPP(format) - PIXMAN_FORMAT_B(format) -
			   PIXMAN_FORMAT_G(format) - PIXMAN_FORMAT_R(format));

	tmpl.direct.alphaMask = MASK(PIXMAN_FORMAT_A(format));
	tmpl.direct.alpha = 0;

	mask |= PictFormatRed | PictFormatRedMask;
	mask |= PictFormatGreen | PictFormatGreenMask;
	mask |= PictFormatBlue | PictFormatBlueMask;
	mask |= PictFormatAlpha | PictFormatAlphaMask;
	break;

    case PIXMAN_TYPE_A:
	tmpl.type = PictTypeDirect;

	tmpl.direct.alpha = 0;
	tmpl.direct.alphaMask = MASK(PIXMAN_FORMAT_A(format));

	mask |= PictFormatAlpha | PictFormatAlphaMask;
	break;

    case PIXMAN_TYPE_COLOR:
    case PIXMAN_TYPE_GRAY:
	/* XXX Find matching visual/colormap */
	tmpl.type = PictTypeIndexed;
	//tmpl.colormap = screen->visuals[PIXMAN_FORMAT_VIS(format)].vid;
	//mask |= PictFormatColormap;
	return NULL;
    }
#undef MASK

    /* XXX caching? */
    return XRenderFindFormat(dpy, mask, &tmpl, 0);
}

XRenderPictFormat *
_cairo_xlib_display_get_xrender_format (cairo_xlib_display_t	*display,
	                                cairo_format_t		 format)
{
    XRenderPictFormat *xrender_format;

#if ! ATOMIC_OP_NEEDS_MEMORY_BARRIER
    xrender_format = display->cached_xrender_formats[format];
    if (likely (xrender_format != NULL))
	return xrender_format;
#endif

    xrender_format = display->cached_xrender_formats[format];
    if (xrender_format == NULL) {
	int pict_format = PictStandardNUM;

	switch (format) {
	case CAIRO_FORMAT_A1:
	    pict_format = PictStandardA1; break;
	case CAIRO_FORMAT_A8:
	    pict_format = PictStandardA8; break;
	case CAIRO_FORMAT_RGB24:
	    pict_format = PictStandardRGB24; break;
	case CAIRO_FORMAT_RGB16_565:
	    xrender_format = _cairo_xlib_display_get_xrender_format_for_pixman(display,
									       PIXMAN_r5g6b5);
	    break;
	case CAIRO_FORMAT_RGB30:
	    xrender_format = _cairo_xlib_display_get_xrender_format_for_pixman(display,
									       PIXMAN_x2r10g10b10);
	    break;
	case CAIRO_FORMAT_INVALID:
	default:
	    ASSERT_NOT_REACHED;
	case CAIRO_FORMAT_ARGB32:
	    pict_format = PictStandardARGB32; break;
	}
	if (pict_format != PictStandardNUM)
	    xrender_format =
		XRenderFindStandardFormat (display->display, pict_format);
	display->cached_xrender_formats[format] = xrender_format;
    }

    return xrender_format;
}

cairo_xlib_screen_t *
_cairo_xlib_display_get_screen (cairo_xlib_display_t *display,
				Screen *screen)
{
    cairo_xlib_screen_t *info;

    cairo_list_foreach_entry (info, cairo_xlib_screen_t, &display->screens, link) {
	if (info->screen == screen) {
            if (display->screens.next != &info->link)
                cairo_list_move (&info->link, &display->screens);
            return info;
        }
    }

    return NULL;
}

cairo_bool_t
_cairo_xlib_display_has_repeat (cairo_device_t *device)
{
    return ! ((cairo_xlib_display_t *) device)->buggy_repeat;
}

cairo_bool_t
_cairo_xlib_display_has_reflect (cairo_device_t *device)
{
    return ! ((cairo_xlib_display_t *) device)->buggy_pad_reflect;
}

cairo_bool_t
_cairo_xlib_display_has_gradients (cairo_device_t *device)
{
    return ! ((cairo_xlib_display_t *) device)->buggy_gradients;
}

/**
 * cairo_xlib_device_debug_cap_xrender_version:
 * @device: a #cairo_device_t for the Xlib backend
 * @major_version: major version to restrict to
 * @minor_version: minor version to restrict to
 *
 * Restricts all future Xlib surfaces for this devices to the specified version
 * of the RENDER extension. This function exists solely for debugging purpose.
 * It let's you find out how cairo would behave with an older version of
 * the RENDER extension.
 *
 * Use the special values -1 and -1 for disabling the RENDER extension.
 *
 * Since: 1.12
 **/
void
cairo_xlib_device_debug_cap_xrender_version (cairo_device_t *device,
					     int major_version,
					     int minor_version)
{
    cairo_xlib_display_t *display = (cairo_xlib_display_t *) device;

    if (device == NULL || device->status)
	return;

    if (device->backend->type != CAIRO_DEVICE_TYPE_XLIB)
	return;

    if (major_version < display->render_major ||
	(major_version == display->render_major &&
	 minor_version < display->render_minor))
    {
	display->render_major = major_version;
	display->render_minor = minor_version;
    }

    _cairo_xlib_display_select_compositor (display);
}

/**
 * cairo_xlib_device_debug_set_precision:
 * @device: a #cairo_device_t for the Xlib backend
 * @precision: the precision to use
 *
 * Render supports two modes of precision when rendering trapezoids. Set
 * the precision to the desired mode.
 *
 * Since: 1.12
 **/
void
cairo_xlib_device_debug_set_precision (cairo_device_t *device,
				       int precision)
{
    if (device == NULL || device->status)
	return;
    if (device->backend->type != CAIRO_DEVICE_TYPE_XLIB) {
	cairo_status_t status;

	status = _cairo_device_set_error (device, CAIRO_STATUS_DEVICE_TYPE_MISMATCH);
	(void) status;
	return;
    }

    ((cairo_xlib_display_t *) device)->force_precision = precision;
}

/**
 * cairo_xlib_device_debug_get_precision:
 * @device: a #cairo_device_t for the Xlib backend
 *
 * Get the Xrender precision mode.
 *
 * Returns: the render precision mode
 *
 * Since: 1.12
 **/
int
cairo_xlib_device_debug_get_precision (cairo_device_t *device)
{
    if (device == NULL || device->status)
	return -1;
    if (device->backend->type != CAIRO_DEVICE_TYPE_XLIB) {
	cairo_status_t status;

	status = _cairo_device_set_error (device, CAIRO_STATUS_DEVICE_TYPE_MISMATCH);
	(void) status;
	return -1;
    }

    return ((cairo_xlib_display_t *) device)->force_precision;
}

#endif /* !CAIRO_HAS_XLIB_XCB_FUNCTIONS */