path: root/xorg-server/hw/vfb/InitOutput.c

/*

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 */