mibstore.c

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		}
		REGION_SUBTRACT(pScreen, &Border, &pWin->borderSize,
				&pWin->winSize);
		REGION_INTERSECT(pScreen, &Border, &Border, &Remaining);
		if (REGION_NUM_RECTS(&Border) > 0)
		{
		    REGION_TRANSLATE(pScreen, &Border, -pWin->drawable.x,
						  -pWin->drawable.y);
		    miBSFillVirtualBits ((DrawablePtr) pPixmap, pGC, &Border,
				    	xoff, yoff,
				    	pWin->borderIsPixel ? (int)BackgroundPixel : (int)BackgroundPixmap,
				    	pWin->border, ~0L);
		}
	    }

	    if (pWin->viewable && pWin->firstChild)
		pWin = pWin->firstChild;
	    else
	    {
		while (!pWin->nextSib && pWin != (WindowPtr) pDrawable)
		    pWin = pWin->parent;
		if (pWin == (WindowPtr) pDrawable)
		    break;
		pWin = pWin->nextSib;
	    }
	}

	REGION_UNINIT(pScreen, &Remaining);

	if (pPixmap)
	{
	    REGION_UNINIT(pScreen, &Border);
	    REGION_UNINIT(pScreen, &Inside);
	    (*pScreen->GetImage) ((DrawablePtr) pPixmap,
		0, 0, w, h, format, planemask, pdstLine);
	    (*pScreen->DestroyPixmap) (pPixmap);
	    FreeScratchGC (pGC);
	}
	else
	{
	    goto punt;
	}
    }
    else
    {
punt:	;
	(*pScreen->GetImage) (pDrawable, sx, sy, w, h,
			      format, planemask, pdstLine);
    }

    SCREEN_EPILOGUE (pScreen, GetImage, miBSGetImage);
}

static void
miBSGetSpans (pDrawable, wMax, ppt, pwidth, nspans, pdstStart)
    DrawablePtr	pDrawable;
    int		wMax;
    DDXPointPtr	ppt;
    int		*pwidth;
    int		nspans;
    char	*pdstStart;
{
    ScreenPtr		    pScreen = pDrawable->pScreen;
    BoxRec		    bounds;
    int			    i;
    WindowPtr		    pWin;
    int			    dx, dy;
    
    SCREEN_PROLOGUE (pScreen, GetSpans);

    if (pDrawable->type != DRAWABLE_PIXMAP && ((WindowPtr) pDrawable)->backStorage)
    {
	PixmapPtr	pPixmap;
	miBSWindowPtr	pWindowPriv;
	GCPtr		pGC;

	pWin = (WindowPtr) pDrawable;
	pWindowPriv = (miBSWindowPtr) pWin->backStorage;
	pPixmap = pWindowPriv->pBackingPixmap;

    	bounds.x1 = ppt->x;
    	bounds.y1 = ppt->y;
    	bounds.x2 = bounds.x1 + *pwidth;
    	bounds.y2 = ppt->y;
    	for (i = 0; i < nspans; i++)
    	{
	    if (ppt[i].x < bounds.x1)
	    	bounds.x1 = ppt[i].x;
	    if (ppt[i].x + pwidth[i] > bounds.x2)
	    	bounds.x2 = ppt[i].x + pwidth[i];
	    if (ppt[i].y < bounds.y1)
	    	bounds.y1 = ppt[i].y;
	    else if (ppt[i].y > bounds.y2)
	    	bounds.y2 = ppt[i].y;
    	}
    
    	switch (RECT_IN_REGION(pScreen, &pWindowPriv->SavedRegion, &bounds))
 	{
	case rgnPART:
	    if (!pPixmap)
	    {
		miCreateBSPixmap (pWin, NullBox);
		if (!(pPixmap = pWindowPriv->pBackingPixmap))
		    break;
	    }
	    pWindowPriv->status = StatusNoPixmap;
	    pGC = GetScratchGC(pPixmap->drawable.depth,
			       pPixmap->drawable.pScreen);
	    if (pGC)
	    {
		ValidateGC ((DrawablePtr) pPixmap, pGC);
		(*pGC->ops->CopyArea)
		    (pDrawable, (DrawablePtr) pPixmap, pGC,
		    bounds.x1, bounds.y1,
		    bounds.x2 - bounds.x1, bounds.y2 - bounds.y1,
		    bounds.x1 + pPixmap->drawable.x - pWin->drawable.x -
		     pWindowPriv->x,
		    bounds.y1 + pPixmap->drawable.y - pWin->drawable.y -
		     pWindowPriv->y);
		FreeScratchGC(pGC);
	    }
	    pWindowPriv->status = StatusContents;
	    /* fall through */
	case rgnIN:
	    if (!pPixmap)
	    {
		miCreateBSPixmap (pWin, NullBox);
		if (!(pPixmap = pWindowPriv->pBackingPixmap))
		    break;
	    }
	    dx = pPixmap->drawable.x - pWin->drawable.x - pWindowPriv->x;
	    dy = pPixmap->drawable.y - pWin->drawable.y - pWindowPriv->y;
	    for (i = 0; i < nspans; i++)
	    {
		ppt[i].x += dx;
		ppt[i].y += dy;
	    }
	    (*pScreen->GetSpans) ((DrawablePtr) pPixmap, wMax, ppt, pwidth,
				  nspans, pdstStart);
	    break;
	case rgnOUT:
	    (*pScreen->GetSpans) (pDrawable, wMax, ppt, pwidth, nspans,
				  pdstStart);
	    break;
	}
    }
    else
    {
	(*pScreen->GetSpans) (pDrawable, wMax, ppt, pwidth, nspans, pdstStart);
    }

    SCREEN_EPILOGUE (pScreen, GetSpans, miBSGetSpans);
}

static Bool
miBSChangeWindowAttributes (pWin, mask)
    WindowPtr	    pWin;
    unsigned long   mask;
{
    ScreenPtr	pScreen;
    Bool	ret;

    pScreen = pWin->drawable.pScreen;

    SCREEN_PROLOGUE (pScreen, ChangeWindowAttributes);

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

    if (ret && (mask & CWBackingStore))
    {
	if (pWin->backingStore != NotUseful || pWin->DIXsaveUnder)
	    miBSAllocate (pWin);
	else
	    miBSFree (pWin);
    }

    SCREEN_EPILOGUE (pScreen, ChangeWindowAttributes, miBSChangeWindowAttributes);

    return ret;
}

/*
 * GC Create wrapper.  Set up the cheap GC func wrappers to track
 * GC validation on BackingStore windows
 */

static Bool
miBSCreateGC (pGC)
    GCPtr   pGC;
{
    ScreenPtr	pScreen = pGC->pScreen;
    Bool	ret;

    SCREEN_PROLOGUE (pScreen, CreateGC);
    
    if ( (ret = (*pScreen->CreateGC) (pGC)) )
    {
    	pGC->devPrivates[miBSGCIndex].ptr = (pointer) pGC->funcs;
    	pGC->funcs = &miBSCheapGCFuncs;
    }

    SCREEN_EPILOGUE (pScreen, CreateGC, miBSCreateGC);

    return ret;
}

static Bool
miBSDestroyWindow (pWin)
    WindowPtr	pWin;
{
    ScreenPtr	pScreen = pWin->drawable.pScreen;
    Bool	ret;

    SCREEN_PROLOGUE (pScreen, DestroyWindow);
    
    ret = (*pScreen->DestroyWindow) (pWin);

    miBSFree (pWin);

    SCREEN_EPILOGUE (pScreen, DestroyWindow, miBSDestroyWindow);

    return ret;
}

/*
 * cheap GC func wrappers.  Simply track validation on windows
 * with backing store to enable the real func/op wrappers
 */

static void
miBSCheapValidateGC (pGC, stateChanges, pDrawable)
    GCPtr	    pGC;
    unsigned long   stateChanges;
    DrawablePtr	    pDrawable;
{
    CHEAP_FUNC_PROLOGUE (pGC);
    
    if (pDrawable->type != DRAWABLE_PIXMAP &&
        ((WindowPtr) pDrawable)->backStorage != NULL &&
	miBSCreateGCPrivate (pGC))
    {
	(*pGC->funcs->ValidateGC) (pGC, stateChanges, pDrawable);
    }
    else
    {
	(*pGC->funcs->ValidateGC) (pGC, stateChanges, pDrawable);

	/* rewrap funcs as Validate may have changed them */
	pGC->devPrivates[miBSGCIndex].ptr = (pointer) pGC->funcs;

	CHEAP_FUNC_EPILOGUE (pGC);
    }
}

static void
miBSCheapChangeGC (pGC, mask)
    GCPtr   pGC;
    unsigned long   mask;
{
    CHEAP_FUNC_PROLOGUE (pGC);

    (*pGC->funcs->ChangeGC) (pGC, mask);

    CHEAP_FUNC_EPILOGUE (pGC);
}

static void
miBSCheapCopyGC (pGCSrc, mask, pGCDst)
    GCPtr   pGCSrc, pGCDst;
    unsigned long   mask;
{
    CHEAP_FUNC_PROLOGUE (pGCDst);

    (*pGCDst->funcs->CopyGC) (pGCSrc, mask, pGCDst);

    CHEAP_FUNC_EPILOGUE (pGCDst);
}

static void
miBSCheapDestroyGC (pGC)
    GCPtr   pGC;
{
    CHEAP_FUNC_PROLOGUE (pGC);

    (*pGC->funcs->DestroyGC) (pGC);

    /* leave it unwrapped */
}

static void
miBSCheapChangeClip (pGC, type, pvalue, nrects)
    GCPtr   pGC;
    int		type;
    pointer	pvalue;
    int		nrects;
{
    CHEAP_FUNC_PROLOGUE (pGC);

    (*pGC->funcs->ChangeClip) (pGC, type, pvalue, nrects);

    CHEAP_FUNC_EPILOGUE (pGC);
}

static void
miBSCheapCopyClip(pgcDst, pgcSrc)
    GCPtr pgcDst, pgcSrc;
{
    CHEAP_FUNC_PROLOGUE (pgcDst);

    (* pgcDst->funcs->CopyClip)(pgcDst, pgcSrc);

    CHEAP_FUNC_EPILOGUE (pgcDst);
}

static void
miBSCheapDestroyClip(pGC)
    GCPtr	pGC;
{
    CHEAP_FUNC_PROLOGUE (pGC);

    (* pGC->funcs->DestroyClip)(pGC);

    CHEAP_FUNC_EPILOGUE (pGC);
}

/*
 * create the full func/op wrappers for a GC
 */

static Bool
miBSCreateGCPrivate (pGC)
    GCPtr   pGC;
{
    miBSGCRec	*pPriv;

    pPriv = (miBSGCRec *) xalloc (sizeof (miBSGCRec));
    if (!pPriv)
	return FALSE;
    pPriv->pBackingGC = NULL;
    pPriv->guarantee = GuaranteeNothing;
    pPriv->serialNumber = 0;
    pPriv->stateChanges = (1 << (GCLastBit + 1)) - 1;
    pPriv->wrapOps = pGC->ops;
    pPriv->wrapFuncs = pGC->funcs;
    pGC->funcs = &miBSGCFuncs;
    pGC->ops = &miBSGCOps;
    pGC->devPrivates[miBSGCIndex].ptr = (pointer) pPriv;
    return TRUE;
}

static void
miBSDestroyGCPrivate (pGC)
    GCPtr   pGC;
{
    miBSGCRec	*pPriv;

    pPriv = (miBSGCRec *) pGC->devPrivates[miBSGCIndex].ptr;
    if (pPriv)
    {
	pGC->devPrivates[miBSGCIndex].ptr = (pointer) pPriv->wrapFuncs;
	pGC->funcs = &miBSCheapGCFuncs;
	pGC->ops = pPriv->wrapOps;
	if (pPriv->pBackingGC)
	    FreeGC (pPriv->pBackingGC, (GContext) 0);
	xfree ((pointer) pPriv);
    }
}

/*
 * GC ops -- wrap each GC operation with our own function
 */

/*-
 *-----------------------------------------------------------------------
 * miBSFillSpans --
 *	Perform a FillSpans, routing output to backing-store as needed.
 *
 * Results:
 *	None.
 *
 * Side Effects:
 *
 *-----------------------------------------------------------------------
 */
static void
miBSFillSpans(pDrawable, pGC, nInit, pptInit, pwidthInit, fSorted)
    DrawablePtr pDrawable;
    GCPtr	pGC;
    int		nInit;			/* number of spans to fill */
    DDXPointPtr pptInit;		/* pointer to list of start points */
    int		*pwidthInit;		/* pointer to list of n widths */
    int 	fSorted;
{
    DDXPointPtr	pptCopy, pptReset;
    int 	*pwidthCopy;
    SETUP_BACKING (pDrawable, pGC);

    PROLOGUE(pGC);

    pptCopy = (DDXPointPtr)ALLOCATE_LOCAL(nInit*sizeof(DDXPointRec));
    pwidthCopy=(int *)ALLOCATE_LOCAL(nInit*sizeof(int));
    if (pptCopy && pwidthCopy)
    {
	copyData(pptInit, pptCopy, nInit, MoreCopy0);
	memmove((char *)pwidthCopy,(char *)pwidthInit,nInit*sizeof(int));

	(* pGC->ops->FillSpans)(pDrawable, pGC, nInit, pptInit,
			     pwidthInit, fSorted);
	if (pGC->miTranslate)
	{
	    int	dx, dy;
	    int	nReset;

	    pptReset = pptCopy;
	    dx = pDrawable->x - pBackingDrawable->x;
	    dy = pDrawable->y - pBackingDrawable->y;
	    nReset = nInit;
	    while (nReset--)
	    {
		pptReset->x -= dx;
		pptReset->y -= dy;
		++pptReset;
	    }
	}
	(* pBackingGC->ops->FillSpans)(pBackingDrawable,
				  pBackingGC, nInit, pptCopy, pwidthCopy,
				  fSorted);
    }
    if (pwidthCopy) DEALLOCATE_LOCAL(pwidthCopy);
    if (pptCopy) DEALLOCATE_LOCAL(pptCopy);

    EPILOGUE (pGC);
}

/*-
 *-----------------------------------------------------------------------
 * miBSSetSpans --
 *	Perform a SetSpans, routing output to backing-store as needed.
 *
 * Results:
 *	None.
 *
 * Side Effects:
 *
 *-----------------------------------------------------------------------
 */
static void
miBSSetSpans(pDrawable, pGC, psrc, ppt, pwidth, nspans, fSorted)
    DrawablePtr		pDrawable;
    GCPtr		pGC;
    char		*psrc;
    register DDXPointPtr ppt;
    int			*pwidth;
    int			nspans;
    int			fSorted;
{
    DDXPointPtr	pptCopy, pptReset;
    int 	*pwidthCopy;
    SETUP_BACKING (pDrawable, pGC);

    PROLOGUE(pGC);

    pptCopy = (DDXPointPtr)ALLOCATE_LOCAL(nspans*sizeof(DDXPointRec));
    pwidthCopy=(int *)ALLOCATE_LOCAL(nspans*sizeof(int));
    if (pptCopy && pwidthCopy)
    {
	copyData(ppt, pptCopy, nspans, MoreCopy0);
	memmove((char *)pwidthCopy,(char *)pwidth,nspans*sizeof(int));

	(* pGC->ops->SetSpans)(pDrawable, pGC, psrc, ppt, pwidth,
			       nspans, fSorted);
	if (pGC->miTranslate)
	{
	    int	dx, dy;
	    int	nReset;

	    pptReset = pptCopy;
	    dx = pDrawable->x - pBackingDrawable->x;
	    dy = pDrawable->y - pBackingDrawable->y;
	    nReset = nspans;
	    while (nReset--)
	    {
		pptReset->x -= dx;
		pptReset->y -= dy;
		++pptReset;
	    }
	}
	(* pBackingGC->ops->SetSpans)(pBackingDrawable, pBackingGC,
				psrc, pptCopy, pwidthCopy, nspans, fSorted);
    }
    if (pwidthCopy) DEALLOCATE_LOCAL(pwidthCopy);
    if (pptCopy) DEALLOCATE_LOCAL(pptCopy);

    EPILOGUE (pGC);
}

/*-
 *-----------------------------------------------------------------------
 * miBSPutImage --