aboutsummaryrefslogtreecommitdiff
path: root/xorg-server/dix/privates.c
blob: 497a2396e597aedad79ccffcd75dad3e446b657f (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
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
/*

Copyright 1993, 1998  The Open Group

Permission to use, copy, modify, distribute, and sell this software and its
documentation for any purpose is hereby granted without fee, provided that
the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation.

The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of The Open Group shall
not be used in advertising or otherwise to promote the sale, use or
other dealings in this Software without prior written authorization
from The Open Group.

*/
/*
 * Copyright © 2010, Keith Packard
 * Copyright © 2010, Jamey Sharp
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that copyright
 * notice and this permission notice appear in supporting documentation, and
 * that the name of the copyright holders not be used in advertising or
 * publicity pertaining to distribution of the software without specific,
 * written prior permission.  The copyright holders make no representations
 * about the suitability of this software for any purpose.  It is provided "as
 * is" without express or implied warranty.
 *
 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
 * OF THIS SOFTWARE.
 */

#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#endif

#include <stddef.h>
#include "windowstr.h"
#include "resource.h"
#include "privates.h"
#include "gcstruct.h"
#include "cursorstr.h"
#include "colormapst.h"
#include "inputstr.h"
#include "scrnintstr.h"
#include "extnsionst.h"
#include "inputstr.h"

static DevPrivateSetRec global_keys[PRIVATE_LAST];

static const Bool xselinux_private[PRIVATE_LAST] = {
    /* PRIVATE_XSELINUX,*/    FALSE,
    /* PRIVATE_SCREEN,*/      TRUE,
    /* [PRIVATE_EXTENSION] =*/TRUE,
    /* [PRIVATE_COLORMAP] =*/ TRUE,
    /* [PRIVATE_DEVICE] =*/   TRUE,
    /* [PRIVATE_CLIENT] = */  TRUE,
    /* [PRIVATE_PROPERTY] =*/ TRUE,
    /* [PRIVATE_SELECTION] =*/TRUE,
    /* [PRIVATE_WINDOW] =*/   TRUE,
    /* [PRIVATE_PIXMAP] =*/   TRUE,
    /* [PRIVATE_GC] =*/       TRUE,
    /* [PRIVATE_CURSOR] =*/   TRUE,
    /* PRIVATE_CURSOR_BITS,*/ FALSE,
    /* PRIVATE_DBE_WINDOW,*/  FALSE,
    /* PRIVATE_DAMAGE,*/      FALSE,
    /* PRIVATE_GLYPH,*/       FALSE,
    /* [PRIVATE_GLYPHSET] =*/ TRUE,
    /* [PRIVATE_PICTURE] =*/  TRUE
};

static const char *key_names[PRIVATE_LAST] = {
    /* XSELinux uses the same private keys for numerous objects */
    /*[PRIVATE_XSELINUX] =*/ "XSELINUX",

    /* Otherwise, you get a private in just the requested structure
     */
    /* These can have objects created before all of the keys are registered */
    /*[PRIVATE_SCREEN] =*/ "SCREEN",
    /*[PRIVATE_EXTENSION] =*/ "EXTENSION",
    /*[PRIVATE_COLORMAP] =*/ "COLORMAP",
    /*[PRIVATE_DEVICE] =*/ "DEVICE",

    /* These cannot have any objects before all relevant keys are registered */
    /*[PRIVATE_CLIENT] =*/ "CLIENT",
    /*[PRIVATE_PROPERTY] =*/ "PROPERTY",
    /*[PRIVATE_SELECTION] =*/ "SELECTION",
    /*[PRIVATE_WINDOW] =*/ "WINDOW",
    /*[PRIVATE_PIXMAP] =*/ "PIXMAP",
    /*[PRIVATE_GC] =*/ "GC",
    /*[PRIVATE_CURSOR] =*/ "CURSOR",
    /*[PRIVATE_CURSOR_BITS] =*/ "CURSOR_BITS",

    /* extension privates */
    /*[PRIVATE_DBE_WINDOW] =*/ "DBE_WINDOW",
    /*[PRIVATE_DAMAGE] =*/ "DAMAGE",
    /*[PRIVATE_GLYPH] =*/ "GLYPH",
    /*[PRIVATE_GLYPHSET] =*/ "GLYPHSET",
    /*[PRIVATE_PICTURE] =*/ "PICTURE",
    /*[PRIVATE_SYNC_FENCE] =*/ "SYNC_FENCE",
};

static const Bool screen_specific_private[PRIVATE_LAST] = {
    /*[PRIVATE_XSELINUX] =*/ FALSE,
    /*[PRIVATE_SCREEN] =*/ FALSE,
    /*[PRIVATE_EXTENSION] =*/ FALSE,
    /*[PRIVATE_COLORMAP] =*/ FALSE,
    /*[PRIVATE_DEVICE] =*/ FALSE,
    /*[PRIVATE_CLIENT] =*/ FALSE,
    /*[PRIVATE_PROPERTY] =*/ FALSE,
    /*[PRIVATE_SELECTION] =*/ FALSE,
    /*[PRIVATE_WINDOW] =*/ TRUE,
    /*[PRIVATE_PIXMAP] =*/ TRUE,
    /*[PRIVATE_GC] =*/ TRUE,
    /*[PRIVATE_CURSOR] =*/ FALSE,
    /*[PRIVATE_CURSOR_BITS] =*/ FALSE,
    /*[PRIVATE_DBE_WINDOW] =*/ FALSE,
    /*[PRIVATE_DAMAGE] =*/ FALSE,
    /*[PRIVATE_GLYPH] =*/ FALSE,
    /*[PRIVATE_GLYPHSET] =*/ FALSE,
    /*[PRIVATE_PICTURE] =*/ TRUE,
    /*[PRIVATE_SYNC_FENCE] =*/ FALSE
};

typedef Bool (*FixupFunc) (PrivatePtr *privates, int offset, unsigned bytes);

typedef enum { FixupMove, FixupRealloc } FixupType;

static Bool
dixReallocPrivates(PrivatePtr *privates, int old_offset, unsigned bytes)
{
    void *new_privates;

    new_privates = realloc(*privates, old_offset + bytes);
    if (!new_privates)
        return FALSE;
    memset((char *) new_privates + old_offset, '\0', bytes);
    *privates = new_privates;
    return TRUE;
}

static Bool
dixMovePrivates(PrivatePtr *privates, int new_offset, unsigned bytes)
{
    memmove((char *) *privates + bytes, *privates, new_offset - bytes);
    memset(*privates, '\0', bytes);
    return TRUE;
}

static Bool
fixupOneScreen(ScreenPtr pScreen, FixupFunc fixup, unsigned bytes)
{
    intptr_t        dist;
    char            *old;
    char            *new;
    DevPrivateKey   *keyp, key;
    DevPrivateType  type;
    int             size;

    old = (char *) pScreen->devPrivates;
    size = global_keys[PRIVATE_SCREEN].offset;
    if (!fixup (&pScreen->devPrivates, size, bytes))
        return FALSE;

    /* Screen privates can contain screen-specific private keys
     * for other types. When they move, the linked list we use to
     * track them gets scrambled. Fix that by computing the change
     * in the location of each private adjusting our linked list
     * pointers to match
     */

    new = (char *) pScreen->devPrivates;

    /* Moving means everyone shifts up in the privates by 'bytes' amount,
     * realloc means the base pointer moves
     */
    if (fixup == dixMovePrivates)
        new += bytes;

    dist = new - old;

    if (dist) {
        for (type = PRIVATE_XSELINUX; type < PRIVATE_LAST; type++)

            /* Walk the privates list, being careful as the
             * pointers are scrambled before we patch them.
             */
            for (keyp = &pScreen->screenSpecificPrivates[type].key;
                 (key = *keyp) != NULL;
                 keyp = &key->next)
            {

                /* Only mangle things if the private structure
                 * is contained within the allocation. Privates
                 * stored elsewhere will be left alone
                 */
                if (old <= (char *) key && (char *) key < old + size)
                {
                    /* Compute new location of key */
                    key = (DevPrivateKey) ((char *) key + dist);

                    /* Patch the list */
                    *keyp = key;
                }
            }
    }
    return TRUE;
}

static Bool
fixupScreens(FixupFunc fixup, unsigned bytes)
{
    int s;

    for (s = 0; s < screenInfo.numScreens; s++)
        if (!fixupOneScreen (screenInfo.screens[s], fixup, bytes))
            return FALSE;

    for (s = 0; s < screenInfo.numGPUScreens; s++)
        if (!fixupOneScreen (screenInfo.gpuscreens[s], fixup, bytes))
            return FALSE;
    return TRUE;
}

static Bool
fixupServerClient(FixupFunc fixup, unsigned bytes)
{
    if (serverClient)
        return fixup(&serverClient->devPrivates, global_keys[PRIVATE_CLIENT].offset,
                     bytes);
    return TRUE;
}

static Bool
fixupExtensions(FixupFunc fixup, unsigned bytes)
{
    unsigned char major;
    ExtensionEntry *extension;

    for (major = EXTENSION_BASE; (extension = GetExtensionEntry(major));
         major++)
        if (!fixup
            (&extension->devPrivates, global_keys[PRIVATE_EXTENSION].offset, bytes))
            return FALSE;
    return TRUE;
}

static Bool
fixupDefaultColormaps(FixupFunc fixup, unsigned bytes)
{
    int s;

    for (s = 0; s < screenInfo.numScreens; s++) {
        ColormapPtr cmap;

        dixLookupResourceByType((pointer *) &cmap,
                                screenInfo.screens[s]->defColormap, RT_COLORMAP,
                                serverClient, DixCreateAccess);
        if (cmap &&
            !fixup(&cmap->devPrivates, screenInfo.screens[s]->screenSpecificPrivates[PRIVATE_COLORMAP].offset, bytes))
            return FALSE;
    }
    return TRUE;
}

static Bool
fixupDeviceList(DeviceIntPtr device, FixupFunc fixup, unsigned bytes)
{
    while (device) {
        if (!fixup(&device->devPrivates, global_keys[PRIVATE_DEVICE].offset, bytes))
            return FALSE;
        device = device->next;
    }
    return TRUE;
}

static Bool
fixupDevices(FixupFunc fixup, unsigned bytes)
{
    return (fixupDeviceList(inputInfo.devices, fixup, bytes) &&
            fixupDeviceList(inputInfo.off_devices, fixup, bytes));
}

static Bool (*const allocated_early[PRIVATE_LAST]) (FixupFunc, unsigned) = {
    /*PRIVATE_XSELINUX,*/     NULL,
    /*PRIVATE_SCREEN =*/      fixupScreens,
    /*PRIVATE_EXTENSION =*/   fixupExtensions,
    /*PRIVATE_COLORMAP =*/    fixupDefaultColormaps,
    /*PRIVATE_DEVICE,*/       fixupDevices,
    /*PRIVATE_CLIENT =*/      fixupServerClient,
    /*PRIVATE_PROPERTY,*/     NULL,
    /*PRIVATE_SELECTION,*/    NULL,
    /*PRIVATE_WINDOW,*/       NULL,
    /*PRIVATE_PIXMAP,*/       NULL,
    /*PRIVATE_GC,*/           NULL,
    /*PRIVATE_CURSOR,*/       NULL,
    /*PRIVATE_CURSOR_BITS,*/  NULL,
    /*PRIVATE_DBE_WINDOW,*/   NULL,
    /*PRIVATE_DAMAGE,*/       NULL,
    /*PRIVATE_GLYPH,*/        NULL,
    /*PRIVATE_GLYPHSET,*/     NULL,
    /*PRIVATE_PICTURE,*/      NULL,
    /*PRIVATE_SYNC_FENCE,*/   NULL
};

static void
grow_private_set(DevPrivateSetPtr set, unsigned bytes)
{
    DevPrivateKey       k;

    for (k = set->key; k; k = k->next)
        k->offset += bytes;
    set->offset += bytes;
}

static void
grow_screen_specific_set(DevPrivateType type, unsigned bytes)
{
    int s;

    /* Update offsets for all screen-specific keys */
    for (s = 0; s < screenInfo.numScreens; s++) {
        ScreenPtr       pScreen = screenInfo.screens[s];

        grow_private_set(&pScreen->screenSpecificPrivates[type], bytes);
    }
}

/*
 * Register a private key. This takes the type of object the key will
 * be used with, which may be PRIVATE_ALL indicating that this key
 * will be used with all of the private objects. If 'size' is
 * non-zero, then the specified amount of space will be allocated in
 * the private storage. Otherwise, space for a single pointer will
 * be allocated which can be set with dixSetPrivate
 */
Bool
dixRegisterPrivateKey(DevPrivateKey key, DevPrivateType type, unsigned size)
{
    DevPrivateType t;
    int offset;
    unsigned bytes;

    if (key->initialized) {
        assert(size == key->size);
        return TRUE;
    }

    /* Compute required space */
    bytes = size;
    if (size == 0)
        bytes = sizeof(void *);

    /* align to void * size */
    bytes = (bytes + sizeof(void *) - 1) & ~(sizeof(void *) - 1);

    /* Update offsets for all affected keys */
    if (type == PRIVATE_XSELINUX) {

        /* Resize if we can, or make sure nothing's allocated if we can't
         */
        for (t = PRIVATE_XSELINUX; t < PRIVATE_LAST; t++)
            if (xselinux_private[t]) {
                if (!allocated_early[t])
                    assert(!global_keys[t].created);
                else if (!allocated_early[t] (dixReallocPrivates, bytes))
                    return FALSE;
            }

        /* Move all existing keys up in the privates space to make
         * room for this new global key
         */
        for (t = PRIVATE_XSELINUX; t < PRIVATE_LAST; t++) {
            if (xselinux_private[t]) {
                grow_private_set(&global_keys[t], bytes);
                grow_screen_specific_set(t, bytes);
                if (allocated_early[t])
                    allocated_early[t] (dixMovePrivates, bytes);
            }

        }

        offset = 0;
    }
    else {
        /* Resize if we can, or make sure nothing's allocated if we can't */
        if (!allocated_early[type])
            assert(!global_keys[type].created);
        else if (!allocated_early[type] (dixReallocPrivates, bytes))
            return FALSE;
        offset = global_keys[type].offset;
        global_keys[type].offset += bytes;
        grow_screen_specific_set(type, bytes);
    }

    /* Setup this key */
    key->offset = offset;
    key->size = size;
    key->initialized = TRUE;
    key->type = type;
    key->allocated = FALSE;
    key->next = global_keys[type].key;
    global_keys[type].key = key;

    return TRUE;
}

Bool
dixRegisterScreenPrivateKey(DevScreenPrivateKey screenKey, ScreenPtr pScreen,
                            DevPrivateType type, unsigned size)
{
    DevPrivateKey key;

    if (!dixRegisterPrivateKey(&screenKey->screenKey, PRIVATE_SCREEN, 0))
        return FALSE;
    key = dixGetPrivate(&pScreen->devPrivates, &screenKey->screenKey);
    if (key != NULL) {
        assert(key->size == size);
        assert(key->type == type);
        return TRUE;
    }
    key = calloc(sizeof(DevPrivateKeyRec), 1);
    if (!key)
        return FALSE;
    if (!dixRegisterPrivateKey(key, type, size)) {
        free(key);
        return FALSE;
    }
    key->allocated = TRUE;
    dixSetPrivate(&pScreen->devPrivates, &screenKey->screenKey, key);
    return TRUE;
}

DevPrivateKey
_dixGetScreenPrivateKey(const DevScreenPrivateKey key, ScreenPtr pScreen)
{
    return dixGetPrivate(&pScreen->devPrivates, &key->screenKey);
}

/*
 * Initialize privates by zeroing them
 */
void
_dixInitPrivates(PrivatePtr *privates, void *addr, DevPrivateType type)
{
    assert (!screen_specific_private[type]);

    global_keys[type].created++;
    if (xselinux_private[type])
        global_keys[PRIVATE_XSELINUX].created++;
    if (global_keys[type].offset == 0)
        addr = 0;
    *privates = addr;
    memset(addr, '\0', global_keys[type].offset);
}

/*
 * Clean up privates
 */
void
_dixFiniPrivates(PrivatePtr privates, DevPrivateType type)
{
    global_keys[type].created--;
    if (xselinux_private[type])
        global_keys[PRIVATE_XSELINUX].created--;
}

/*
 * Allocate new object with privates.
 *
 * This is expected to be invoked from the
 * dixAllocateObjectWithPrivates macro
 */
void *
_dixAllocateObjectWithPrivates(unsigned baseSize, unsigned clear,
                               unsigned offset, DevPrivateType type)
{
    unsigned totalSize;
    void *object;
    PrivatePtr privates;
    PrivatePtr *devPrivates;

    assert(type > PRIVATE_SCREEN && type < PRIVATE_LAST);
    assert(!screen_specific_private[type]);

    /* round up so that void * is aligned */
    baseSize = (baseSize + sizeof(void *) - 1) & ~(sizeof(void *) - 1);
    totalSize = baseSize + global_keys[type].offset;
    object = malloc(totalSize);
    if (!object)
        return NULL;

    memset(object, '\0', clear);
    privates = (PrivatePtr) (((char *) object) + baseSize);
    devPrivates = (PrivatePtr *) ((char *) object + offset);

    _dixInitPrivates(devPrivates, privates, type);

    return object;
}

/*
 * Allocate privates separately from containing object.
 * Used for clients and screens.
 */
Bool
dixAllocatePrivates(PrivatePtr *privates, DevPrivateType type)
{
    unsigned size;
    PrivatePtr p;

    assert(type > PRIVATE_XSELINUX && type < PRIVATE_LAST);
    assert(!screen_specific_private[type]);

    size = global_keys[type].offset;
    if (!size) {
        p = NULL;
    }
    else {
        if (!(p = malloc(size)))
            return FALSE;
    }

    _dixInitPrivates(privates, p, type);
    ++global_keys[type].allocated;

    return TRUE;
}

/*
 * Free an object that has privates
 *
 * This is expected to be invoked from the
 * dixFreeObjectWithPrivates macro
 */
void
_dixFreeObjectWithPrivates(void *object, PrivatePtr privates,
                           DevPrivateType type)
{
    _dixFiniPrivates(privates, type);
    free(object);
}

/*
 * Called to free screen or client privates
 */
void
dixFreePrivates(PrivatePtr privates, DevPrivateType type)
{
    _dixFiniPrivates(privates, type);
    --global_keys[type].allocated;
    free(privates);
}

/*
 * Return size of privates for the specified type
 */
extern _X_EXPORT int
dixPrivatesSize(DevPrivateType type)
{
    assert(type >= PRIVATE_SCREEN && type < PRIVATE_LAST);
    assert (!screen_specific_private[type]);

    return global_keys[type].offset;
}

/* Table of devPrivates offsets */
static const int offsets[] = {
    -1,                         /* RT_NONE */
    offsetof(WindowRec, devPrivates),   /* RT_WINDOW */
    offsetof(PixmapRec, devPrivates),   /* RT_PIXMAP */
    offsetof(GC, devPrivates),  /* RT_GC */
    -1,                         /* RT_FONT */
    offsetof(CursorRec, devPrivates),   /* RT_CURSOR */
    offsetof(ColormapRec, devPrivates), /* RT_COLORMAP */
};

#define NUM_OFFSETS	(sizeof (offsets) / sizeof (offsets[0]))

int
dixLookupPrivateOffset(RESTYPE type)
{
    /*
     * Special kludge for DBE which registers a new resource type that
     * points at pixmaps (thanks, DBE)
     */
    if (type & RC_DRAWABLE) {
        if (type == RT_WINDOW)
            return offsets[RT_WINDOW & TypeMask];
        else
            return offsets[RT_PIXMAP & TypeMask];
    }
    type = type & TypeMask;
    if (type < NUM_OFFSETS)
        return offsets[type];
    return -1;
}

/*
 * Screen-specific privates
 */

extern _X_EXPORT Bool
dixRegisterScreenSpecificPrivateKey(ScreenPtr pScreen, DevPrivateKey key,
                                    DevPrivateType type, unsigned size)
{
    int offset;
    unsigned bytes;

    if (!screen_specific_private[type])
        FatalError("Attempt to allocate screen-specific private storage for type %s\n",
                   key_names[type]);

    if (key->initialized) {
        assert(size == key->size);
        return TRUE;
    }

    /* Compute required space */
    bytes = size;
    if (size == 0)
        bytes = sizeof(void *);

    /* align to void * size */
    bytes = (bytes + sizeof(void *) - 1) & ~(sizeof(void *) - 1);

    assert (!allocated_early[type]);
    assert (!pScreen->screenSpecificPrivates[type].created);
    offset = pScreen->screenSpecificPrivates[type].offset;
    pScreen->screenSpecificPrivates[type].offset += bytes;

    /* Setup this key */
    key->offset = offset;
    key->size = size;
    key->initialized = TRUE;
    key->type = type;
    key->allocated = FALSE;
    key->next = pScreen->screenSpecificPrivates[type].key;
    pScreen->screenSpecificPrivates[type].key = key;

    return TRUE;
}

/* Clean up screen-specific privates before CloseScreen */
void
dixFreeScreenSpecificPrivates(ScreenPtr pScreen)
{
}

/* Initialize screen-specific privates in AddScreen */
void
dixInitScreenSpecificPrivates(ScreenPtr pScreen)
{
    DevPrivateType      t;

    for (t = PRIVATE_XSELINUX; t < PRIVATE_LAST; t++)
        pScreen->screenSpecificPrivates[t].offset = global_keys[t].offset;
}

/* Initialize screen-specific privates in AddScreen */
void
_dixInitScreenPrivates(ScreenPtr pScreen, PrivatePtr *privates, void *addr, DevPrivateType type)
{
    int privates_size;
    assert (screen_specific_private[type]);

    if (pScreen) {
        privates_size = pScreen->screenSpecificPrivates[type].offset;
        pScreen->screenSpecificPrivates[type].created++;
    }
    else
        privates_size = global_keys[type].offset;

    global_keys[type].created++;
    if (xselinux_private[type])
        global_keys[PRIVATE_XSELINUX].created++;
    if (privates_size == 0)
        addr = 0;
    *privates = addr;
    memset(addr, '\0', privates_size);
}

void *
_dixAllocateScreenObjectWithPrivates(ScreenPtr pScreen,
                                     unsigned baseSize,
                                     unsigned clear,
                                     unsigned offset,
                                     DevPrivateType type)
{
    unsigned totalSize;
    void *object;
    PrivatePtr privates;
    PrivatePtr *devPrivates;
    int privates_size;

    assert(type > PRIVATE_SCREEN && type < PRIVATE_LAST);
    assert (screen_specific_private[type]);

    if (pScreen)
        privates_size = pScreen->screenSpecificPrivates[type].offset;
    else
        privates_size = global_keys[type].offset;
    /* round up so that void * is aligned */
    baseSize = (baseSize + sizeof(void *) - 1) & ~(sizeof(void *) - 1);
    totalSize = baseSize + privates_size;
    object = malloc(totalSize);
    if (!object)
        return NULL;

    memset(object, '\0', clear);
    privates = (PrivatePtr) (((char *) object) + baseSize);
    devPrivates = (PrivatePtr *) ((char *) object + offset);

    _dixInitScreenPrivates(pScreen, devPrivates, privates, type);

    return object;
}

int
dixScreenSpecificPrivatesSize(ScreenPtr pScreen, DevPrivateType type)
{
    assert(type >= PRIVATE_SCREEN && type < PRIVATE_LAST);

    if (screen_specific_private[type])
        return pScreen->screenSpecificPrivates[type].offset;
    else
        return global_keys[type].offset;
}

void
dixPrivateUsage(void)
{
    int objects = 0;
    int bytes = 0;
    int alloc = 0;
    DevPrivateType t;

    for (t = PRIVATE_XSELINUX + 1; t < PRIVATE_LAST; t++) {
        if (global_keys[t].offset) {
            ErrorF
                ("%s: %d objects of %d bytes = %d total bytes %d private allocs\n",
                 key_names[t], global_keys[t].created, global_keys[t].offset,
                 global_keys[t].created * global_keys[t].offset, global_keys[t].allocated);
            bytes += global_keys[t].created * global_keys[t].offset;
            objects += global_keys[t].created;
            alloc += global_keys[t].allocated;
        }
    }
    ErrorF("TOTAL: %d objects, %d bytes, %d allocs\n", objects, bytes, alloc);
}

void
dixResetPrivates(void)
{
    DevPrivateType t;

    for (t = PRIVATE_XSELINUX; t < PRIVATE_LAST; t++) {
        DevPrivateKey key, next;

        for (key = global_keys[t].key; key; key = next) {
            next = key->next;
            key->offset = 0;
            key->initialized = FALSE;
            key->size = 0;
            key->type = 0;
            if (key->allocated)
                free(key);
        }
        if (global_keys[t].created) {
            ErrorF("%d %ss still allocated at reset\n",
                   global_keys[t].created, key_names[t]);
            dixPrivateUsage();
        }
        global_keys[t].key = NULL;
        global_keys[t].offset = 0;
        global_keys[t].created = 0;
        global_keys[t].allocated = 0;
    }
}