aboutsummaryrefslogtreecommitdiff
path: root/xorg-server/hw/vfb/InitOutput.c
blob: 97eccfd4e236ed8544336ae32def9a4da5ba0f57 (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
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
/*

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.

*/

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

#if defined(WIN32)
#include <X11/Xwinsock.h>
#endif
#include <stdio.h>
#include <X11/X.h>
#include <X11/Xproto.h>
#include <X11/Xos.h>
#include "scrnintstr.h"
#include "servermd.h"
#define PSZ 8
#include "fb.h"
#include "colormapst.h"
#include "gcstruct.h"
#include "input.h"
#include "mipointer.h"
#include "micmap.h"
#include <sys/types.h>
#ifdef HAVE_MMAP
#include <sys/mman.h>
#ifndef MAP_FILE
#define MAP_FILE 0
#endif
#endif                          /* HAVE_MMAP */
#include <sys/stat.h>
#include <errno.h>
#ifndef WIN32
#include <sys/param.h>
#endif
#include <X11/XWDFile.h>
#ifdef HAS_SHM
#include <sys/ipc.h>
#include <sys/shm.h>
#endif                          /* HAS_SHM */
#include "dix.h"
#include "miline.h"
#include "glx_extinit.h"

#define VFB_DEFAULT_WIDTH      1280
#define VFB_DEFAULT_HEIGHT     1024
#define VFB_DEFAULT_DEPTH         8
#define VFB_DEFAULT_WHITEPIXEL    1
#define VFB_DEFAULT_BLACKPIXEL    0
#define VFB_DEFAULT_LINEBIAS      0
#define XWD_WINDOW_NAME_LEN      60

typedef struct {
    int width;
    int paddedBytesWidth;
    int paddedWidth;
    int height;
    int depth;
    int bitsPerPixel;
    int sizeInBytes;
    int ncolors;
    char *pfbMemory;
    XWDColor *pXWDCmap;
    XWDFileHeader *pXWDHeader;
    Pixel blackPixel;
    Pixel whitePixel;
    unsigned int lineBias;
    CloseScreenProcPtr closeScreen;

#ifdef HAVE_MMAP
    int mmap_fd;
    char mmap_file[MAXPATHLEN];
#endif

#ifdef HAS_SHM
    int shmid;
#endif
} vfbScreenInfo, *vfbScreenInfoPtr;

static int vfbNumScreens;
static vfbScreenInfo *vfbScreens;

static vfbScreenInfo defaultScreenInfo = {
    .width = VFB_DEFAULT_WIDTH,
    .height = VFB_DEFAULT_HEIGHT,
    .depth = VFB_DEFAULT_DEPTH,
    .blackPixel = VFB_DEFAULT_BLACKPIXEL,
    .whitePixel = VFB_DEFAULT_WHITEPIXEL,
    .lineBias = VFB_DEFAULT_LINEBIAS,
};

static Bool vfbPixmapDepths[33];

#ifdef HAVE_MMAP
static char *pfbdir = NULL;
#endif
typedef enum { NORMAL_MEMORY_FB, SHARED_MEMORY_FB, MMAPPED_FILE_FB } fbMemType;
static fbMemType fbmemtype = NORMAL_MEMORY_FB;
static char needswap = 0;
static Bool Render = TRUE;

#define swapcopy16(_dst, _src) \
    if (needswap) { CARD16 _s = _src; cpswaps(_s, _dst); } \
    else _dst = _src;

#define swapcopy32(_dst, _src) \
    if (needswap) { CARD32 _s = _src; cpswapl(_s, _dst); } \
    else _dst = _src;

static void
vfbInitializePixmapDepths(void)
{
    int i;

    vfbPixmapDepths[1] = TRUE;  /* always need bitmaps */
    for (i = 2; i <= 32; i++)
        vfbPixmapDepths[i] = FALSE;
}

static int
vfbBitsPerPixel(int depth)
{
    if (depth == 1)
        return 1;
    else if (depth <= 8)
        return 8;
    else if (depth <= 16)
        return 16;
    else
        return 32;
}

void
ddxGiveUp(enum ExitCode error)
{
    int i;

    /* clean up the framebuffers */

    switch (fbmemtype) {
#ifdef HAVE_MMAP
    case MMAPPED_FILE_FB:
        for (i = 0; i < vfbNumScreens; i++) {
            if (-1 == unlink(vfbScreens[i].mmap_file)) {
                perror("unlink");
                ErrorF("unlink %s failed, %s",
                       vfbScreens[i].mmap_file, strerror(errno));
            }
        }
        break;
#else                           /* HAVE_MMAP */
    case MMAPPED_FILE_FB:
        break;
#endif                          /* HAVE_MMAP */

#ifdef HAS_SHM
    case SHARED_MEMORY_FB:
        for (i = 0; i < vfbNumScreens; i++) {
            if (-1 == shmdt((char *) vfbScreens[i].pXWDHeader)) {
                perror("shmdt");
                ErrorF("shmdt failed, %s", strerror(errno));
            }
        }
        break;
#else                           /* HAS_SHM */
    case SHARED_MEMORY_FB:
        break;
#endif                          /* HAS_SHM */

    case NORMAL_MEMORY_FB:
        for (i = 0; i < vfbNumScreens; i++) {
            free(vfbScreens[i].pXWDHeader);
        }
        break;
    }
}

void
AbortDDX(enum ExitCode error)
{
    ddxGiveUp(error);
}

#ifdef __APPLE__
void
DarwinHandleGUI(int argc, char *argv[])
{
}
#endif

void
OsVendorInit(void)
{
}

void
OsVendorFatalError(const char *f, va_list args)
{
}

#if defined(DDXBEFORERESET)
void
ddxBeforeReset(void)
{
    return;
}
#endif

void
ddxUseMsg(void)
{
    ErrorF("-screen scrn WxHxD     set screen's width, height, depth\n");
    ErrorF("-pixdepths list-of-int support given pixmap depths\n");
    ErrorF("+/-render		   turn on/off RENDER extension support"
           "(default on)\n");
    ErrorF("-linebias n            adjust thin line pixelization\n");
    ErrorF("-blackpixel n          pixel value for black\n");
    ErrorF("-whitepixel n          pixel value for white\n");

#ifdef HAVE_MMAP
    ErrorF
        ("-fbdir directory       put framebuffers in mmap'ed files in directory\n");
#endif

#ifdef HAS_SHM
    ErrorF("-shmem                 put framebuffers in shared memory\n");
#endif
}

int
ddxProcessArgument(int argc, char *argv[], int i)
{
    static Bool firstTime = TRUE;
    static int lastScreen = -1;
    vfbScreenInfo *currentScreen;

    if (firstTime) {
        vfbInitializePixmapDepths();
        firstTime = FALSE;
    }

    if (lastScreen == -1)
        currentScreen = &defaultScreenInfo;
    else
        currentScreen = &vfbScreens[lastScreen];

#define CHECK_FOR_REQUIRED_ARGUMENTS(num) \
    if (((i + num) >= argc) || (!argv[i + num])) {                      \
      ErrorF("Required argument to %s not specified\n", argv[i]);       \
      UseMsg();                                                         \
      FatalError("Required argument to %s not specified\n", argv[i]);   \
    }

    if (strcmp(argv[i], "-screen") == 0) {      /* -screen n WxHxD */
        int screenNum;

        CHECK_FOR_REQUIRED_ARGUMENTS(2);
        screenNum = atoi(argv[i + 1]);
        /* The protocol only has a CARD8 for number of screens in the
           connection setup block, so don't allow more than that. */
        if ((screenNum < 0) || (screenNum >= 255)) {
            ErrorF("Invalid screen number %d\n", screenNum);
            UseMsg();
            FatalError("Invalid screen number %d passed to -screen\n",
                       screenNum);
        }

        if (vfbNumScreens <= screenNum) {
            vfbScreens =
                realloc(vfbScreens, sizeof(*vfbScreens) * (screenNum + 1));
            if (!vfbScreens)
                FatalError("Not enough memory for screen %d\n", screenNum);
            for (; vfbNumScreens <= screenNum; ++vfbNumScreens)
                vfbScreens[vfbNumScreens] = defaultScreenInfo;
        }

        if (3 != sscanf(argv[i + 2], "%dx%dx%d",
                        &vfbScreens[screenNum].width,
                        &vfbScreens[screenNum].height,
                        &vfbScreens[screenNum].depth)) {
            ErrorF("Invalid screen configuration %s\n", argv[i + 2]);
            UseMsg();
            FatalError("Invalid screen configuration %s for -screen %d\n",
                       argv[i + 2], screenNum);
        }

        lastScreen = screenNum;
        return 3;
    }

    if (strcmp(argv[i], "-pixdepths") == 0) {   /* -pixdepths list-of-depth */
        int depth, ret = 1;

        CHECK_FOR_REQUIRED_ARGUMENTS(1);
        while ((++i < argc) && (depth = atoi(argv[i])) != 0) {
            if (depth < 0 || depth > 32) {
                ErrorF("Invalid pixmap depth %d\n", depth);
                UseMsg();
                FatalError("Invalid pixmap depth %d passed to -pixdepths\n",
                           depth);
            }
            vfbPixmapDepths[depth] = TRUE;
            ret++;
        }
        return ret;
    }

    if (strcmp(argv[i], "+render") == 0) {      /* +render */
        Render = TRUE;
        return 1;
    }

    if (strcmp(argv[i], "-render") == 0) {      /* -render */
        Render = FALSE;
#ifdef COMPOSITE
        noCompositeExtension = TRUE;
#endif
        return 1;
    }

    if (strcmp(argv[i], "-blackpixel") == 0) {  /* -blackpixel n */
        CHECK_FOR_REQUIRED_ARGUMENTS(1);
        currentScreen->blackPixel = atoi(argv[++i]);
        return 2;
    }

    if (strcmp(argv[i], "-whitepixel") == 0) {  /* -whitepixel n */
        CHECK_FOR_REQUIRED_ARGUMENTS(1);
        currentScreen->whitePixel = atoi(argv[++i]);
        return 2;
    }

    if (strcmp(argv[i], "-linebias") == 0) {    /* -linebias n */
        CHECK_FOR_REQUIRED_ARGUMENTS(1);
        currentScreen->lineBias = atoi(argv[++i]);
        return 2;
    }

#ifdef HAVE_MMAP
    if (strcmp(argv[i], "-fbdir") == 0) {       /* -fbdir directory */
        CHECK_FOR_REQUIRED_ARGUMENTS(1);
        pfbdir = argv[++i];
        fbmemtype = MMAPPED_FILE_FB;
        return 2;
    }
#endif                          /* HAVE_MMAP */

#ifdef HAS_SHM
    if (strcmp(argv[i], "-shmem") == 0) {       /* -shmem */
        fbmemtype = SHARED_MEMORY_FB;
        return 1;
    }
#endif

    return 0;
}

static DevPrivateKeyRec cmapScrPrivateKeyRec;

#define cmapScrPrivateKey (&cmapScrPrivateKeyRec)

#define GetInstalledColormap(s) ((ColormapPtr) dixLookupPrivate(&(s)->devPrivates, cmapScrPrivateKey))
#define SetInstalledColormap(s,c) (dixSetPrivate(&(s)->devPrivates, cmapScrPrivateKey, c))

static int
vfbListInstalledColormaps(ScreenPtr pScreen, Colormap * pmaps)
{
    /* By the time we are processing requests, we can guarantee that there
     * is always a colormap installed */
    *pmaps = GetInstalledColormap(pScreen)->mid;
    return 1;
}

static void
vfbInstallColormap(ColormapPtr pmap)
{
    ColormapPtr oldpmap = GetInstalledColormap(pmap->pScreen);

    if (pmap != oldpmap) {
        int entries;
        XWDFileHeader *pXWDHeader;
        XWDColor *pXWDCmap;
        VisualPtr pVisual;
        Pixel *ppix;
        xrgb *prgb;
        xColorItem *defs;
        int i;

        if (oldpmap != (ColormapPtr) None)
            WalkTree(pmap->pScreen, TellLostMap, (char *) &oldpmap->mid);
        /* Install pmap */
        SetInstalledColormap(pmap->pScreen, pmap);
        WalkTree(pmap->pScreen, TellGainedMap, (char *) &pmap->mid);

        entries = pmap->pVisual->ColormapEntries;
        pXWDHeader = vfbScreens[pmap->pScreen->myNum].pXWDHeader;
        pXWDCmap = vfbScreens[pmap->pScreen->myNum].pXWDCmap;
        pVisual = pmap->pVisual;

        swapcopy32(pXWDHeader->visual_class, pVisual->class);
        swapcopy32(pXWDHeader->red_mask, pVisual->redMask);
        swapcopy32(pXWDHeader->green_mask, pVisual->greenMask);
        swapcopy32(pXWDHeader->blue_mask, pVisual->blueMask);
        swapcopy32(pXWDHeader->bits_per_rgb, pVisual->bitsPerRGBValue);
        swapcopy32(pXWDHeader->colormap_entries, pVisual->ColormapEntries);

        ppix = (Pixel *) malloc(entries * sizeof(Pixel));
        prgb = (xrgb *) malloc(entries * sizeof(xrgb));
        defs = (xColorItem *) malloc(entries * sizeof(xColorItem));

        for (i = 0; i < entries; i++)
            ppix[i] = i;
        /* XXX truecolor */
        QueryColors(pmap, entries, ppix, prgb, serverClient);

        for (i = 0; i < entries; i++) { /* convert xrgbs to xColorItems */
            defs[i].pixel = ppix[i] & 0xff;     /* change pixel to index */
            defs[i].red = prgb[i].red;
            defs[i].green = prgb[i].green;
            defs[i].blue = prgb[i].blue;
            defs[i].flags = DoRed | DoGreen | DoBlue;
        }
        (*pmap->pScreen->StoreColors) (pmap, entries, defs);

        free(ppix);
        free(prgb);
        free(defs);
    }
}

static void
vfbUninstallColormap(ColormapPtr pmap)
{
    ColormapPtr curpmap = GetInstalledColormap(pmap->pScreen);

    if (pmap == curpmap) {
        if (pmap->mid != pmap->pScreen->defColormap) {
            dixLookupResourceByType((pointer *) &curpmap,
                                    pmap->pScreen->defColormap,
                                    RT_COLORMAP, serverClient,
                                    DixInstallAccess);
            (*pmap->pScreen->InstallColormap) (curpmap);
        }
    }
}

static void
vfbStoreColors(ColormapPtr pmap, int ndef, xColorItem * pdefs)
{
    XWDColor *pXWDCmap;
    int i;

    if (pmap != GetInstalledColormap(pmap->pScreen)) {
        return;
    }

    pXWDCmap = vfbScreens[pmap->pScreen->myNum].pXWDCmap;

    if ((pmap->pVisual->class | DynamicClass) == DirectColor) {
        return;
    }

    for (i = 0; i < ndef; i++) {
        if (pdefs[i].flags & DoRed) {
            swapcopy16(pXWDCmap[pdefs[i].pixel].red, pdefs[i].red);
        }
        if (pdefs[i].flags & DoGreen) {
            swapcopy16(pXWDCmap[pdefs[i].pixel].green, pdefs[i].green);
        }
        if (pdefs[i].flags & DoBlue) {
            swapcopy16(pXWDCmap[pdefs[i].pixel].blue, pdefs[i].blue);
        }
    }
}

static Bool
vfbSaveScreen(ScreenPtr pScreen, int on)
{
    return TRUE;
}

#ifdef HAVE_MMAP

/* this flushes any changes to the screens out to the mmapped file */
static void
vfbBlockHandler(pointer blockData, OSTimePtr pTimeout, pointer pReadmask)
{
    int i;

    for (i = 0; i < vfbNumScreens; i++) {
#ifdef MS_ASYNC
        if (-1 == msync((caddr_t) vfbScreens[i].pXWDHeader,
                        (size_t) vfbScreens[i].sizeInBytes, MS_ASYNC))
#else
        /* silly NetBSD and who else? */
        if (-1 == msync((caddr_t) vfbScreens[i].pXWDHeader,
                        (size_t) vfbScreens[i].sizeInBytes))
#endif
        {
            perror("msync");
            ErrorF("msync failed, %s", strerror(errno));
        }
    }
}

static void
vfbWakeupHandler(pointer blockData, int result, pointer pReadmask)
{
}

static void
vfbAllocateMmappedFramebuffer(vfbScreenInfoPtr pvfb)
{
#define DUMMY_BUFFER_SIZE 65536
    char dummyBuffer[DUMMY_BUFFER_SIZE];
    int currentFileSize, writeThisTime;

    snprintf(pvfb->mmap_file, sizeof(pvfb->mmap_file), "%s/Xvfb_screen%d",
             pfbdir, (int) (pvfb - vfbScreens));
    if (-1 == (pvfb->mmap_fd = open(pvfb->mmap_file, O_CREAT | O_RDWR, 0666))) {
        perror("open");
        ErrorF("open %s failed, %s", pvfb->mmap_file, strerror(errno));
        return;
    }

    /* Extend the file to be the proper size */

    memset(dummyBuffer, 0, DUMMY_BUFFER_SIZE);
    for (currentFileSize = 0;
         currentFileSize < pvfb->sizeInBytes;
         currentFileSize += writeThisTime) {
        writeThisTime = min(DUMMY_BUFFER_SIZE,
                            pvfb->sizeInBytes - currentFileSize);
        if (-1 == write(pvfb->mmap_fd, dummyBuffer, writeThisTime)) {
            perror("write");
            ErrorF("write %s failed, %s", pvfb->mmap_file, strerror(errno));
            return;
        }
    }

    /* try to mmap the file */

    pvfb->pXWDHeader = (XWDFileHeader *) mmap((caddr_t) NULL, pvfb->sizeInBytes,
                                              PROT_READ | PROT_WRITE,
                                              MAP_FILE | MAP_SHARED,
                                              pvfb->mmap_fd, 0);
    if (-1 == (long) pvfb->pXWDHeader) {
        perror("mmap");
        ErrorF("mmap %s failed, %s", pvfb->mmap_file, strerror(errno));
        pvfb->pXWDHeader = NULL;
        return;
    }

    if (!RegisterBlockAndWakeupHandlers(vfbBlockHandler, vfbWakeupHandler,
                                        NULL)) {
        pvfb->pXWDHeader = NULL;
    }
}
#endif                          /* HAVE_MMAP */

#ifdef HAS_SHM
static void
vfbAllocateSharedMemoryFramebuffer(vfbScreenInfoPtr pvfb)
{
    /* create the shared memory segment */

    pvfb->shmid = shmget(IPC_PRIVATE, pvfb->sizeInBytes, IPC_CREAT | 0777);
    if (pvfb->shmid < 0) {
        perror("shmget");
        ErrorF("shmget %d bytes failed, %s", pvfb->sizeInBytes,
               strerror(errno));
        return;
    }

    /* try to attach it */

    pvfb->pXWDHeader = (XWDFileHeader *) shmat(pvfb->shmid, 0, 0);
    if (-1 == (long) pvfb->pXWDHeader) {
        perror("shmat");
        ErrorF("shmat failed, %s", strerror(errno));
        pvfb->pXWDHeader = NULL;
        return;
    }

    ErrorF("screen %d shmid %d\n", (int) (pvfb - vfbScreens), pvfb->shmid);
}
#endif                          /* HAS_SHM */

static char *
vfbAllocateFramebufferMemory(vfbScreenInfoPtr pvfb)
{
    if (pvfb->pfbMemory)
        return pvfb->pfbMemory; /* already done */

    pvfb->sizeInBytes = pvfb->paddedBytesWidth * pvfb->height;

    /* Calculate how many entries in colormap.  This is rather bogus, because
     * the visuals haven't even been set up yet, but we need to know because we
     * have to allocate space in the file for the colormap.  The number 10
     * below comes from the MAX_PSEUDO_DEPTH define in cfbcmap.c.
     */

    if (pvfb->depth <= 10) {    /* single index colormaps */
        pvfb->ncolors = 1 << pvfb->depth;
    }
    else {                      /* decomposed colormaps */
        int nplanes_per_color_component = pvfb->depth / 3;

        if (pvfb->depth % 3)
            nplanes_per_color_component++;
        pvfb->ncolors = 1 << nplanes_per_color_component;
    }

    /* add extra bytes for XWDFileHeader, window name, and colormap */

    pvfb->sizeInBytes += SIZEOF(XWDheader) + XWD_WINDOW_NAME_LEN +
        pvfb->ncolors * SIZEOF(XWDColor);

    pvfb->pXWDHeader = NULL;
    switch (fbmemtype) {
#ifdef HAVE_MMAP
    case MMAPPED_FILE_FB:
        vfbAllocateMmappedFramebuffer(pvfb);
        break;
#else
    case MMAPPED_FILE_FB:
        break;
#endif

#ifdef HAS_SHM
    case SHARED_MEMORY_FB:
        vfbAllocateSharedMemoryFramebuffer(pvfb);
        break;
#else
    case SHARED_MEMORY_FB:
        break;
#endif

    case NORMAL_MEMORY_FB:
        pvfb->pXWDHeader = (XWDFileHeader *) malloc(pvfb->sizeInBytes);
        break;
    }

    if (pvfb->pXWDHeader) {
        pvfb->pXWDCmap = (XWDColor *) ((char *) pvfb->pXWDHeader
                                       + SIZEOF(XWDheader) +
                                       XWD_WINDOW_NAME_LEN);
        pvfb->pfbMemory = (char *) (pvfb->pXWDCmap + pvfb->ncolors);

        return pvfb->pfbMemory;
    }
    else
        return NULL;
}

static void
vfbWriteXWDFileHeader(ScreenPtr pScreen)
{
    vfbScreenInfoPtr pvfb = &vfbScreens[pScreen->myNum];
    XWDFileHeader *pXWDHeader = pvfb->pXWDHeader;
    char hostname[XWD_WINDOW_NAME_LEN];
    unsigned long swaptest = 1;
    int i;

    needswap = *(char *) &swaptest;

    pXWDHeader->header_size =
        (char *) pvfb->pXWDCmap - (char *) pvfb->pXWDHeader;
    pXWDHeader->file_version = XWD_FILE_VERSION;

    pXWDHeader->pixmap_format = ZPixmap;
    pXWDHeader->pixmap_depth = pvfb->depth;
    pXWDHeader->pixmap_height = pXWDHeader->window_height = pvfb->height;
    pXWDHeader->xoffset = 0;
    pXWDHeader->byte_order = IMAGE_BYTE_ORDER;
    pXWDHeader->bitmap_bit_order = BITMAP_BIT_ORDER;
#ifndef INTERNAL_VS_EXTERNAL_PADDING
    pXWDHeader->pixmap_width = pXWDHeader->window_width = pvfb->width;
    pXWDHeader->bitmap_unit = BITMAP_SCANLINE_UNIT;
    pXWDHeader->bitmap_pad = BITMAP_SCANLINE_PAD;
#else
    pXWDHeader->pixmap_width = pXWDHeader->window_width = pvfb->paddedWidth;
    pXWDHeader->bitmap_unit = BITMAP_SCANLINE_UNIT_PROTO;
    pXWDHeader->bitmap_pad = BITMAP_SCANLINE_PAD_PROTO;
#endif
    pXWDHeader->bits_per_pixel = pvfb->bitsPerPixel;
    pXWDHeader->bytes_per_line = pvfb->paddedBytesWidth;
    pXWDHeader->ncolors = pvfb->ncolors;

    /* visual related fields are written when colormap is installed */

    pXWDHeader->window_x = pXWDHeader->window_y = 0;
    pXWDHeader->window_bdrwidth = 0;

    /* write xwd "window" name: Xvfb hostname:server.screen */

    if (-1 == gethostname(hostname, sizeof(hostname)))
        hostname[0] = 0;
    else
        hostname[XWD_WINDOW_NAME_LEN - 1] = 0;
    sprintf((char *) (pXWDHeader + 1), "Xvfb %s:%s.%d", hostname, display,
            pScreen->myNum);

    /* write colormap pixel slot values */

    for (i = 0; i < pvfb->ncolors; i++) {
        pvfb->pXWDCmap[i].pixel = i;
    }

    /* byte swap to most significant byte first */

    if (needswap) {
        SwapLongs((CARD32 *) pXWDHeader, SIZEOF(XWDheader) / 4);
        for (i = 0; i < pvfb->ncolors; i++) {
            swapl(&pvfb->pXWDCmap[i].pixel);
        }
    }
}

static Bool
vfbCursorOffScreen(ScreenPtr *ppScreen, int *x, int *y)
{
    return FALSE;
}

static void
vfbCrossScreen(ScreenPtr pScreen, Bool entering)
{
}

static miPointerScreenFuncRec vfbPointerCursorFuncs = {
    vfbCursorOffScreen,
    vfbCrossScreen,
    miPointerWarpCursor
};

static Bool
vfbCloseScreen(ScreenPtr pScreen)
{
    vfbScreenInfoPtr pvfb = &vfbScreens[pScreen->myNum];
    int i;

    pScreen->CloseScreen = pvfb->closeScreen;

    /*
     * XXX probably lots of stuff to clean.  For now,
     * clear installed colormaps so that server reset works correctly.
     */
    for (i = 0; i < screenInfo.numScreens; i++)
        SetInstalledColormap(screenInfo.screens[i], NULL);

    /*
     * fb overwrites miCloseScreen, so do this here
     */
    if (pScreen->devPrivate)
        (*pScreen->DestroyPixmap) (pScreen->devPrivate);
    pScreen->devPrivate = NULL;

    return pScreen->CloseScreen(pScreen);
}

static Bool
vfbScreenInit(ScreenPtr pScreen, int argc, char **argv)
{
    vfbScreenInfoPtr pvfb = &vfbScreens[pScreen->myNum];
    int dpix = monitorResolution, dpiy = monitorResolution;
    int ret;
    char *pbits;

    if (!dixRegisterPrivateKey(&cmapScrPrivateKeyRec, PRIVATE_SCREEN, 0))
        return FALSE;

    if (dpix == 0)
        dpix = 100;

    if (dpiy == 0)
        dpiy = 100;

    pvfb->paddedBytesWidth = PixmapBytePad(pvfb->width, pvfb->depth);
    pvfb->bitsPerPixel = vfbBitsPerPixel(pvfb->depth);
    if (pvfb->bitsPerPixel >= 8)
        pvfb->paddedWidth = pvfb->paddedBytesWidth / (pvfb->bitsPerPixel / 8);
    else
        pvfb->paddedWidth = pvfb->paddedBytesWidth * 8;
    pbits = vfbAllocateFramebufferMemory(pvfb);
    if (!pbits)
        return FALSE;

    switch (pvfb->depth) {
    case 8:
        miSetVisualTypesAndMasks(8,
                                 ((1 << StaticGray) |
                                  (1 << GrayScale) |
                                  (1 << StaticColor) |
                                  (1 << PseudoColor) |
                                  (1 << TrueColor) |
                                  (1 << DirectColor)), 8, PseudoColor, 0, 0, 0);
        break;
    case 15:
        miSetVisualTypesAndMasks(15,
                                 ((1 << TrueColor) |
                                  (1 << DirectColor)),
                                 8, TrueColor, 0x7c00, 0x03e0, 0x001f);
        break;
    case 16:
        miSetVisualTypesAndMasks(16,
                                 ((1 << TrueColor) |
                                  (1 << DirectColor)),
                                 8, TrueColor, 0xf800, 0x07e0, 0x001f);
        break;
    case 24:
        miSetVisualTypesAndMasks(24,
                                 ((1 << TrueColor) |
                                  (1 << DirectColor)),
                                 8, TrueColor, 0xff0000, 0x00ff00, 0x0000ff);
        break;
    case 30:
        miSetVisualTypesAndMasks(30,
                                 ((1 << TrueColor) |
                                  (1 << DirectColor)),
                                 10, TrueColor, 0x3ff00000, 0x000ffc00,
                                 0x000003ff);
        break;
    default:
        return FALSE;
    }

    miSetPixmapDepths();

    ret = fbScreenInit(pScreen, pbits, pvfb->width, pvfb->height,
                       dpix, dpiy, pvfb->paddedWidth, pvfb->bitsPerPixel);
    if (ret && Render)
        fbPictureInit(pScreen, 0, 0);

    if (!ret)
        return FALSE;

    pScreen->InstallColormap = vfbInstallColormap;
    pScreen->UninstallColormap = vfbUninstallColormap;
    pScreen->ListInstalledColormaps = vfbListInstalledColormaps;

    pScreen->SaveScreen = vfbSaveScreen;
    pScreen->StoreColors = vfbStoreColors;

    miDCInitialize(pScreen, &vfbPointerCursorFuncs);

    vfbWriteXWDFileHeader(pScreen);

    pScreen->blackPixel = pvfb->blackPixel;
    pScreen->whitePixel = pvfb->whitePixel;

    ret = fbCreateDefColormap(pScreen);

    miSetZeroLineBias(pScreen, pvfb->lineBias);

    pvfb->closeScreen = pScreen->CloseScreen;
    pScreen->CloseScreen = vfbCloseScreen;

    return ret;

}                               /* end vfbScreenInit */

static const ExtensionModule vfbExtensions[] = {
#ifdef GLXEXT
    { GlxExtensionInit, "GLX", &noGlxExtension },
#endif
};

static
void vfbExtensionInit(void)
{
    int i;

    for (i = 0; i < ARRAY_SIZE(vfbExtensions); i++)
        LoadExtension(&vfbExtensions[i], TRUE);
}

void
InitOutput(ScreenInfo * screenInfo, int argc, char **argv)
{
    int i;
    int NumFormats = 0;

    if (serverGeneration == 1)
        vfbExtensionInit();

    /* initialize pixmap formats */

    /* must have a pixmap depth to match every screen depth */
    for (i = 0; i < vfbNumScreens; i++) {
        vfbPixmapDepths[vfbScreens[i].depth] = TRUE;
    }

    /* RENDER needs a good set of pixmaps. */
    if (Render) {
        vfbPixmapDepths[1] = TRUE;
        vfbPixmapDepths[4] = TRUE;
        vfbPixmapDepths[8] = TRUE;
#if 0
        vfbPixmapDepths[12] = TRUE;
#endif
/*	vfbPixmapDepths[15] = TRUE; */
        vfbPixmapDepths[16] = TRUE;
        vfbPixmapDepths[24] = TRUE;
#if 0
        vfbPixmapDepths[30] = TRUE;
#endif
        vfbPixmapDepths[32] = TRUE;
    }

    for (i = 1; i <= 32; i++) {
        if (vfbPixmapDepths[i]) {
            if (NumFormats >= MAXFORMATS)
                FatalError("MAXFORMATS is too small for this server\n");
            screenInfo->formats[NumFormats].depth = i;
            screenInfo->formats[NumFormats].bitsPerPixel = vfbBitsPerPixel(i);
            screenInfo->formats[NumFormats].scanlinePad = BITMAP_SCANLINE_PAD;
            NumFormats++;
        }
    }

    screenInfo->imageByteOrder = IMAGE_BYTE_ORDER;
    screenInfo->bitmapScanlineUnit = BITMAP_SCANLINE_UNIT;
    screenInfo->bitmapScanlinePad = BITMAP_SCANLINE_PAD;
    screenInfo->bitmapBitOrder = BITMAP_BIT_ORDER;
    screenInfo->numPixmapFormats = NumFormats;

    /* initialize screens */

    if (vfbNumScreens < 1) {
        vfbScreens = &defaultScreenInfo;
        vfbNumScreens = 1;
    }
    for (i = 0; i < vfbNumScreens; i++) {
        if (-1 == AddScreen(vfbScreenInit, argc, argv)) {
            FatalError("Couldn't add screen %d", i);
        }
    }

}                               /* end InitOutput */