xserver-multidpi/hw/xfree86/xaa/xaaInit.c

#ifdef HAVE_XORG_CONFIG_H
#include <xorg-config.h>
#endif

#include "misc.h"
#include "xf86.h"
#include "xf86_OSproc.h"

#include <X11/X.h>
#include "scrnintstr.h"
#include "pixmapstr.h"
#include "windowstr.h"
#include "xf86str.h"
#include "mi.h"
#include "miline.h"
#include "xaa.h"
#include "xaalocal.h"
#include "xaawrap.h"
#include "xf86fbman.h"
#include "servermd.h"
#ifdef COMPOSITE
#include "cw.h"
#endif

#define MAX_PREALLOC_MEM	65536	/* MUST be >= 1024 */

#define MIN_OFFPIX_SIZE		(320*200)

static Bool XAACloseScreen(int i, ScreenPtr pScreen);
static void XAAGetImage(DrawablePtr pDrawable, int sx, int sy, int w, int h,
			unsigned int format, unsigned long planemask,
			char *pdstLine);
static void XAAGetSpans(DrawablePtr pDrawable, int wMax, DDXPointPtr ppt,
			int *pwidth, int nspans, char *pdstStart);
static PixmapPtr XAACreatePixmap(ScreenPtr pScreen, int w, int h, int depth,
				 unsigned usage_hint);
static Bool XAADestroyPixmap(PixmapPtr pPixmap);
static Bool XAAEnterVT (int index, int flags);
static void XAALeaveVT (int index, int flags);
static int  XAASetDGAMode(int index, int num, DGADevicePtr devRet);
static void XAAEnableDisableFBAccess (int index, Bool enable);
static Bool XAAChangeWindowAttributes (WindowPtr pWin, unsigned long mask);

static DevPrivateKeyRec XAAScreenKeyRec;
#define XAAScreenKey (&XAAScreenKeyRec)
static DevPrivateKeyRec XAAGCKeyRec;
#define XAAGCKey (&XAAGCKeyRec)
static DevPrivateKeyRec XAAPixmapKeyRec;
#define XAAPixmapKey (&XAAPixmapKeyRec)

DevPrivateKey XAAGetScreenKey(void) {
    return XAAScreenKey;
}

DevPrivateKey XAAGetGCKey(void) {
    return XAAGCKey;
}

DevPrivateKey XAAGetPixmapKey(void) {
    return XAAPixmapKey;
}

/* temp kludge */
static Bool SwitchedOut = FALSE;

XAAInfoRecPtr
XAACreateInfoRec(void)
{
    XAAInfoRecPtr infoRec;

    infoRec = calloc(1, sizeof(XAAInfoRec));
    if(infoRec)
	infoRec->CachePixelGranularity = -1;

    return infoRec;
}

void
XAADestroyInfoRec(XAAInfoRecPtr infoRec)
{
    if(!infoRec) return;

    if(infoRec->ClosePixmapCache)
	(*infoRec->ClosePixmapCache)(infoRec->pScrn->pScreen);
   
    free(infoRec->PreAllocMem);

    free(infoRec->PixmapCachePrivate);

    free(infoRec);
}


Bool
XAAInit(ScreenPtr pScreen, XAAInfoRecPtr infoRec)
{
    ScrnInfoPtr pScrn = xf86Screens[pScreen->myNum];
    XAAScreenPtr pScreenPriv;
    int i;
    PictureScreenPtr    ps = GetPictureScreenIfSet(pScreen);

    /* Return successfully if no acceleration wanted */
    if (!infoRec)
	return TRUE;
    
    if (!dixRegisterPrivateKey(&XAAGCKeyRec, PRIVATE_GC, sizeof(XAAGCRec)))
	return FALSE;

    if (!dixRegisterPrivateKey(&XAAPixmapKeyRec, PRIVATE_PIXMAP, sizeof(XAAPixmapRec)))
	return FALSE;

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

    if (!(pScreenPriv = malloc(sizeof(XAAScreenRec))))
	return FALSE;

    dixSetPrivate(&pScreen->devPrivates, XAAScreenKey, pScreenPriv);

    if(!xf86FBManagerRunning(pScreen))
	infoRec->Flags &= ~(PIXMAP_CACHE | OFFSCREEN_PIXMAPS);
    if(!(infoRec->Flags & LINEAR_FRAMEBUFFER))
	infoRec->Flags &= ~OFFSCREEN_PIXMAPS;
   
    if(!infoRec->FullPlanemask) { /* for backwards compatibility */
	infoRec->FullPlanemask =  (1 << pScrn->depth) - 1;
	infoRec->FullPlanemasks[pScrn->depth - 1] = infoRec->FullPlanemask;
    }

    for(i = 0; i < 32; i++) {
	if(!infoRec->FullPlanemasks[i]) /* keep any set by caller */
	    infoRec->FullPlanemasks[i] = (1 << (i+1)) - 1;	
    }

    if(!XAAInitAccel(pScreen, infoRec)) return FALSE;
    pScreenPriv->AccelInfoRec = infoRec;
    infoRec->ScratchGC.pScreen = pScreen;

    
    if(!infoRec->GetImage)
	infoRec->GetImage = XAAGetImage;
    if(!infoRec->GetSpans)
	infoRec->GetSpans = XAAGetSpans;
    if(!infoRec->CopyWindow)
	infoRec->CopyWindow = XAACopyWindow;

    pScreenPriv->CreateGC = pScreen->CreateGC;
    pScreen->CreateGC = XAACreateGC;
    pScreenPriv->CloseScreen = pScreen->CloseScreen;
    pScreen->CloseScreen = XAACloseScreen;
    pScreenPriv->GetImage = pScreen->GetImage;
    pScreen->GetImage = infoRec->GetImage;
    pScreenPriv->GetSpans = pScreen->GetSpans;
    pScreen->GetSpans = infoRec->GetSpans;
    pScreenPriv->CopyWindow = pScreen->CopyWindow;
    pScreen->CopyWindow = infoRec->CopyWindow;
    pScreenPriv->CreatePixmap = pScreen->CreatePixmap;
    pScreen->CreatePixmap = XAACreatePixmap;
    pScreenPriv->DestroyPixmap = pScreen->DestroyPixmap;
    pScreen->DestroyPixmap = XAADestroyPixmap;
    pScreenPriv->ChangeWindowAttributes = pScreen->ChangeWindowAttributes;
    pScreen->ChangeWindowAttributes = XAAChangeWindowAttributes;

    pScreenPriv->EnterVT = pScrn->EnterVT;
    pScrn->EnterVT = XAAEnterVT; 
    pScreenPriv->LeaveVT = pScrn->LeaveVT;
    pScrn->LeaveVT = XAALeaveVT;
    pScreenPriv->SetDGAMode = pScrn->SetDGAMode;
    pScrn->SetDGAMode = XAASetDGAMode;
    pScreenPriv->EnableDisableFBAccess = pScrn->EnableDisableFBAccess;
    pScrn->EnableDisableFBAccess = XAAEnableDisableFBAccess;

    pScreenPriv->WindowExposures = pScreen->WindowExposures;
    if (ps)
    {
	pScreenPriv->Composite = ps->Composite;
	ps->Composite = XAAComposite;
	pScreenPriv->Glyphs = ps->Glyphs;
	ps->Glyphs = XAAGlyphs;
    }
    if(pScrn->overlayFlags & OVERLAY_8_32_PLANAR)
        XAASetupOverlay8_32Planar(pScreen);

    infoRec->PreAllocMem = malloc(MAX_PREALLOC_MEM);
    if(infoRec->PreAllocMem)
    	infoRec->PreAllocSize = MAX_PREALLOC_MEM;

    if(infoRec->Flags & PIXMAP_CACHE) 
	xf86RegisterFreeBoxCallback(pScreen, infoRec->InitPixmapCache,
						(pointer)infoRec);

    if(infoRec->Flags & MICROSOFT_ZERO_LINE_BIAS)
	miSetZeroLineBias(pScreen, OCTANT1 | OCTANT2 | OCTANT3 | OCTANT4);

#ifdef COMPOSITE
    /* Initialize the composite wrapper.  This needs to happen after the
     * wrapping above (so it comes before us), but before all other extensions,
     * so it doesn't confuse them. (particularly damage).
     */
    miInitializeCompositeWrapper(pScreen);
#endif

    return TRUE;
}



static Bool
XAACloseScreen (int i, ScreenPtr pScreen)
{
    ScrnInfoPtr pScrn = xf86Screens[pScreen->myNum];
    XAAScreenPtr pScreenPriv = 
	(XAAScreenPtr)dixLookupPrivate(&pScreen->devPrivates, XAAScreenKey);

    pScrn->EnterVT = pScreenPriv->EnterVT; 
    pScrn->LeaveVT = pScreenPriv->LeaveVT; 
    pScrn->EnableDisableFBAccess = pScreenPriv->EnableDisableFBAccess;
   
    pScreen->CreateGC = pScreenPriv->CreateGC;
    pScreen->CloseScreen = pScreenPriv->CloseScreen;
    pScreen->GetImage = pScreenPriv->GetImage;
    pScreen->GetSpans = pScreenPriv->GetSpans;
    pScreen->CopyWindow = pScreenPriv->CopyWindow;
    pScreen->WindowExposures = pScreenPriv->WindowExposures;
    pScreen->CreatePixmap = pScreenPriv->CreatePixmap;
    pScreen->DestroyPixmap = pScreenPriv->DestroyPixmap;
    pScreen->ChangeWindowAttributes = pScreenPriv->ChangeWindowAttributes;

    /* We leave it up to the client to free the XAAInfoRec */

    free((pointer) pScreenPriv);

    return (*pScreen->CloseScreen) (i, pScreen);
}

static void
XAAGetImage (
    DrawablePtr pDraw,
    int	sx, int sy, int w, int h,
    unsigned int    format,
    unsigned long   planemask,
    char	    *pdstLine 
)
{
    ScreenPtr pScreen = pDraw->pScreen;
    XAAInfoRecPtr infoRec = GET_XAAINFORECPTR_FROM_SCREEN(pScreen);
    ScrnInfoPtr pScrn = infoRec->pScrn;

    if(pScrn->vtSema && 
	((pDraw->type == DRAWABLE_WINDOW) || IS_OFFSCREEN_PIXMAP(pDraw))) 
    {
	if(infoRec->ReadPixmap && (format == ZPixmap) && 
	   ((planemask & infoRec->FullPlanemasks[pDraw->depth - 1]) == 
                           infoRec->FullPlanemasks[pDraw->depth - 1]) &&
	   (pDraw->bitsPerPixel == BitsPerPixel(pDraw->depth)))
	{
	    (*infoRec->ReadPixmap)(pScrn, 
		   sx + pDraw->x, sy + pDraw->y, w, h,
		   (unsigned char *)pdstLine,
		   PixmapBytePad(w, pDraw->depth), 
		   pDraw->bitsPerPixel, pDraw->depth);
	    return;
	}
	SYNC_CHECK(pDraw);
    }

    XAA_SCREEN_PROLOGUE (pScreen, GetImage);
    (*pScreen->GetImage) (pDraw, sx, sy, w, h, format, planemask, pdstLine);
    XAA_SCREEN_EPILOGUE (pScreen, GetImage, XAAGetImage);
}

static void
XAAGetSpans (
    DrawablePtr pDraw,
    int		wMax,
    DDXPointPtr	ppt,
    int		*pwidth,
    int		nspans,
    char	*pdstStart
)
{
    ScreenPtr pScreen = pDraw->pScreen;
    XAA_SCREEN_PROLOGUE (pScreen, GetSpans);
    if(xf86Screens[pScreen->myNum]->vtSema && 
	((pDraw->type == DRAWABLE_WINDOW) || IS_OFFSCREEN_PIXMAP(pDraw))) {
	SYNC_CHECK(pDraw);
    }
    (*pScreen->GetSpans) (pDraw, wMax, ppt, pwidth, nspans, pdstStart);
    XAA_SCREEN_EPILOGUE (pScreen, GetSpans, XAAGetSpans);
}


static int
XAAPixmapBPP (ScreenPtr pScreen, int depth)
{
    PixmapPtr	pPix;
    int		bpp;
    DestroyPixmapProcPtr    destroyPixmap;
    
    XAA_SCREEN_PROLOGUE (pScreen, CreatePixmap);
    pPix = (*pScreen->CreatePixmap) (pScreen, 1, 1, depth,
				     CREATE_PIXMAP_USAGE_SCRATCH);
    XAA_SCREEN_EPILOGUE (pScreen, CreatePixmap, XAACreatePixmap);
    if (!pPix)
	return 0;
    bpp = pPix->drawable.bitsPerPixel;
    destroyPixmap = pScreen->DestroyPixmap;
    XAA_SCREEN_PROLOGUE (pScreen, DestroyPixmap);
    (*pScreen->DestroyPixmap) (pPix);
    XAA_SCREEN_EPILOGUE (pScreen, DestroyPixmap, destroyPixmap);
    return bpp;
}

static void
XAAInitializeOffscreenDepths (ScreenPtr pScreen)
{
    XAAInfoRecPtr   infoRec = GET_XAAINFORECPTR_FROM_SCREEN(pScreen);
    ScrnInfoPtr	    pScrn = xf86Screens[pScreen->myNum];
    int		    d, dep;
    
    infoRec->offscreenDepthsInitialized = TRUE;
    infoRec->offscreenDepths = 0;
    if (infoRec->Flags & OFFSCREEN_PIXMAPS) {
	for (d = 0; d < pScreen->numDepths; d++) {
	    dep = pScreen->allowedDepths[d].depth;
	    if (XAAPixmapBPP (pScreen, dep) == pScrn->bitsPerPixel)
		infoRec->offscreenDepths |= (1 << (dep - 1));
	}
    }
}

static PixmapPtr 
XAACreatePixmap(ScreenPtr pScreen, int w, int h, int depth, unsigned usage_hint)
{
    XAAInfoRecPtr infoRec = GET_XAAINFORECPTR_FROM_SCREEN(pScreen);
    ScrnInfoPtr pScrn = xf86Screens[pScreen->myNum];
    XAAPixmapPtr pPriv;
    PixmapPtr pPix = NULL;
    int size = w * h;

    if (w > 32767 || h > 32767)
	return NullPixmap;
    
    if (!infoRec->offscreenDepthsInitialized)
	XAAInitializeOffscreenDepths (pScreen);

    if(pScrn->vtSema &&
	(usage_hint != CREATE_PIXMAP_USAGE_GLYPH_PICTURE) &&
	(infoRec->offscreenDepths & (1 << (depth - 1))) &&
	(size >= MIN_OFFPIX_SIZE) && !SwitchedOut &&
	(!infoRec->maxOffPixWidth || (w <= infoRec->maxOffPixWidth)) &&
	(!infoRec->maxOffPixHeight || (h <= infoRec->maxOffPixHeight)) )
    {
        PixmapLinkPtr pLink;
	PixmapPtr pScreenPix;
        FBAreaPtr area;
        int gran = 0;

	switch(pScrn->bitsPerPixel) {
        case 24: 
        case 8:  gran = 4;  break;
        case 16: gran = 2;  break;
        case 32: gran = 1;  break;
        default: break;
        }

        if(BITMAP_SCANLINE_PAD == 64)
           gran *= 2;

        if(!(area = xf86AllocateOffscreenArea(pScreen, w, h, gran, 0,
                                XAARemoveAreaCallback, NULL))) {
	    goto BAILOUT;
	}

        if(!(pLink = malloc(sizeof(PixmapLink)))) {
            xf86FreeOffscreenArea(area);
	    goto BAILOUT;
	}

	XAA_SCREEN_PROLOGUE (pScreen, CreatePixmap);
	pPix = (*pScreen->CreatePixmap) (pScreen, 0, 0, depth, usage_hint);
	XAA_SCREEN_EPILOGUE (pScreen, CreatePixmap, XAACreatePixmap);

	if (!pPix) {
	    free(pLink);
            xf86FreeOffscreenArea(area);
	    goto BAILOUT;
	}
	
	pScreenPix = (*pScreen->GetScreenPixmap)(pScreen);

	pPriv = XAA_GET_PIXMAP_PRIVATE(pPix);
	pPix->drawable.x = area->box.x1;
	pPix->drawable.y = area->box.y1;
	pPix->drawable.width = w;
	pPix->drawable.height = h;
	pPix->drawable.bitsPerPixel = pScrn->bitsPerPixel;
	pPix->devKind = pScreenPix->devKind;
	pPix->devPrivate.ptr = pScreenPix->devPrivate.ptr;
	area->devPrivate.ptr = pPix;

	pPriv->flags = OFFSCREEN;
	pPriv->offscreenArea = area;
 	pPriv->freeData = FALSE;
	    
	pLink->next = infoRec->OffscreenPixmaps;
	pLink->pPix = pPix;
	infoRec->OffscreenPixmaps = pLink;
	return pPix;
    }
BAILOUT:
    XAA_SCREEN_PROLOGUE (pScreen, CreatePixmap);
    pPix = (*pScreen->CreatePixmap) (pScreen, w, h, depth, usage_hint);
    XAA_SCREEN_EPILOGUE (pScreen, CreatePixmap, XAACreatePixmap);

    if(pPix) {
       pPriv = XAA_GET_PIXMAP_PRIVATE(pPix);
       pPriv->flags = 0;
       pPriv->offscreenArea = NULL;
       pPriv->freeData = FALSE;
       if(!w || !h) /* either scratch or shared memory */
	    pPriv->flags |= SHARED_PIXMAP;
    }

    return pPix;
}

static Bool 
XAADestroyPixmap(PixmapPtr pPix)
{
    ScreenPtr pScreen = pPix->drawable.pScreen;
    XAAInfoRecPtr infoRec = GET_XAAINFORECPTR_FROM_SCREEN(pScreen);
    XAAPixmapPtr pPriv = XAA_GET_PIXMAP_PRIVATE(pPix);
    Bool ret;

    if(pPix->refcnt == 1) {
        if(pPriv->flags & OFFSCREEN) {
	    if(pPriv->flags & DGA_PIXMAP)
	        free(pPriv->offscreenArea);
            else {
	        FBAreaPtr area = pPriv->offscreenArea;
		PixmapLinkPtr pLink = infoRec->OffscreenPixmaps;
	        PixmapLinkPtr prev = NULL;

		while(pLink->pPix != pPix) {
		    prev = pLink;
		    pLink = pLink->next;
		}

	        if(prev) prev->next = pLink->next;
		else infoRec->OffscreenPixmaps = pLink->next;

	        if(!area) area = pLink->area;

	        xf86FreeOffscreenArea(area);
	        pPriv->offscreenArea = NULL;
	        free(pLink);
	    } 
        }

        if(pPriv->freeData) { /* pixmaps that were once in video ram */
	    free(pPix->devPrivate.ptr);
	    pPix->devPrivate.ptr = NULL;
	}
    }
    
    XAA_SCREEN_PROLOGUE (pScreen, DestroyPixmap);
    ret = (*pScreen->DestroyPixmap) (pPix);
    XAA_SCREEN_EPILOGUE (pScreen, DestroyPixmap, XAADestroyPixmap);
 
    return ret;
}

static Bool
XAAChangeWindowAttributes (WindowPtr pWin, unsigned long mask)
{
   ScreenPtr pScreen = pWin->drawable.pScreen;
   Bool ret;

   XAA_SCREEN_PROLOGUE (pScreen, ChangeWindowAttributes);
   ret = (*pScreen->ChangeWindowAttributes) (pWin, mask);
   XAA_SCREEN_EPILOGUE (pScreen, ChangeWindowAttributes, XAAChangeWindowAttributes);

   /* we have to assume that shared memory pixmaps are dirty
      because we can't wrap operations on them */

   if((mask & CWBackPixmap) && (pWin->backgroundState == BackgroundPixmap) &&
      PIXMAP_IS_SHARED(pWin->background.pixmap))
   {
        XAAPixmapPtr pPixPriv = XAA_GET_PIXMAP_PRIVATE(pWin->background.pixmap);
	pPixPriv->flags |= DIRTY;
   }
   if((mask & CWBorderPixmap) && !(pWin->borderIsPixel) &&
      PIXMAP_IS_SHARED(pWin->border.pixmap))
   {
        XAAPixmapPtr pPixPriv = XAA_GET_PIXMAP_PRIVATE(pWin->border.pixmap);
        pPixPriv->flags |= DIRTY;
   }

   return ret;
}



/*  These two aren't really needed for anything */

static Bool 
XAAEnterVT(int index, int flags)
{
    ScrnInfoPtr pScrn = xf86Screens[index];
    Bool ret;
    ScreenPtr pScreen = screenInfo.screens[index];
    XAAScreenPtr pScreenPriv = 
	(XAAScreenPtr)dixLookupPrivate(&pScreen->devPrivates, XAAScreenKey);

    pScrn->EnterVT = pScreenPriv->EnterVT;
    ret = ((*pScreenPriv->EnterVT)(index, flags));
    pScreenPriv->EnterVT = pScrn->EnterVT;
    pScrn->EnterVT = XAAEnterVT;
    return ret;
}

static void 
XAALeaveVT(int index, int flags)
{
    ScrnInfoPtr pScrn = xf86Screens[index];
    ScreenPtr pScreen = screenInfo.screens[index];
    XAAScreenPtr pScreenPriv = 
	(XAAScreenPtr)dixLookupPrivate(&pScreen->devPrivates, XAAScreenKey);
    XAAInfoRecPtr infoRec = pScreenPriv->AccelInfoRec;

    if(infoRec->NeedToSync) {
        (*infoRec->Sync)(infoRec->pScrn);
        infoRec->NeedToSync = FALSE;
    }

    pScrn->LeaveVT = pScreenPriv->LeaveVT;
    (*pScreenPriv->LeaveVT)(index, flags);
    pScreenPriv->LeaveVT = pScrn->LeaveVT;
    pScrn->LeaveVT = XAALeaveVT;
}

typedef struct {
   Bool UsingPixmapCache;
   Bool CanDoColor8x8;
   Bool CanDoMono8x8;
} SavedCacheState, *SavedCacheStatePtr;

static int  
XAASetDGAMode(int index, int num, DGADevicePtr devRet)
{
    ScreenPtr pScreen = screenInfo.screens[index];
    XAAInfoRecPtr infoRec = GET_XAAINFORECPTR_FROM_SCREEN(pScreen);
    XAAScreenPtr pScreenPriv = 
	(XAAScreenPtr)dixLookupPrivate(&pScreen->devPrivates, XAAScreenKey);
    int ret;

    if (!num && infoRec->dgaSaves) { /* restore old pixmap cache state */
	SavedCacheStatePtr state = (SavedCacheStatePtr)infoRec->dgaSaves;
	
	infoRec->UsingPixmapCache = state->UsingPixmapCache;	
	infoRec->CanDoColor8x8 = state->CanDoColor8x8;	
	infoRec->CanDoMono8x8 = state->CanDoMono8x8;
	free(infoRec->dgaSaves);
	infoRec->dgaSaves = NULL;
    }

    ret = (*pScreenPriv->SetDGAMode)(index, num, devRet);
    if(ret != Success) return ret;

    if(num && devRet->pPix) {  /* accelerate this pixmap */
	XAAPixmapPtr pixPriv = XAA_GET_PIXMAP_PRIVATE(devRet->pPix);
	FBAreaPtr area;

	if((area = malloc(sizeof(FBArea)))) {
	    area->pScreen = pScreen;
	    area->box.x1 = 0;
	    area->box.x2 = 0;
	    area->box.y1 = devRet->mode->pixmapWidth;
	    area->box.y2 = devRet->mode->pixmapHeight;
	    area->granularity = 0;
	    area->MoveAreaCallback = 0;
	    area->RemoveAreaCallback = 0;
	    area->devPrivate.ptr = 0;	

	    pixPriv->flags |= OFFSCREEN | DGA_PIXMAP;
	    pixPriv->offscreenArea = area;

	    if(!infoRec->dgaSaves) { /* save pixmap cache state */
		SavedCacheStatePtr state = malloc(sizeof(SavedCacheState));
	
		state->UsingPixmapCache = infoRec->UsingPixmapCache;	
		state->CanDoColor8x8 = infoRec->CanDoColor8x8;	
		state->CanDoMono8x8 = infoRec->CanDoMono8x8;	
		infoRec->dgaSaves = (char*)state;

		infoRec->UsingPixmapCache = FALSE;
		if(infoRec->PixmapCacheFlags & CACHE_MONO_8x8)
		    infoRec->CanDoMono8x8 = FALSE;
		if(infoRec->PixmapCacheFlags & CACHE_COLOR_8x8)
		    infoRec->CanDoColor8x8 = FALSE;
	    }
	}
    }

    return ret;
}



static void
XAAEnableDisableFBAccess (int index, Bool enable)
{
    ScreenPtr pScreen = screenInfo.screens[index];
    XAAInfoRecPtr infoRec = GET_XAAINFORECPTR_FROM_SCREEN(pScreen);
    XAAScreenPtr pScreenPriv = 
	(XAAScreenPtr)dixLookupPrivate(&pScreen->devPrivates, XAAScreenKey);

    if(!enable) {
	if((infoRec->Flags & OFFSCREEN_PIXMAPS) && (infoRec->OffscreenPixmaps))
	    XAAMoveOutOffscreenPixmaps(pScreen);
	if(infoRec->Flags & PIXMAP_CACHE)
	    XAAInvalidatePixmapCache(pScreen);
	SwitchedOut = TRUE;
    }

    (*pScreenPriv->EnableDisableFBAccess)(index, enable);

    if(enable) {
	if((infoRec->Flags & OFFSCREEN_PIXMAPS) && (infoRec->OffscreenPixmaps))
	    XAAMoveInOffscreenPixmaps(pScreen);
	SwitchedOut = FALSE;
    }
}