mbufbf.c

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		pMBPriv->frameBuffer[number];
	}

	switch (ppMBWindow[i]->updateAction)
	{
	case MultibufferUpdateActionUndefined:
	    break;
	case MultibufferUpdateActionBackground:
	    (* MB_SCREEN_PRIV(pScreen)->ClearImageBufferArea)
		(pPrevMBBuffer, 0,0, 0,0, FALSE);
	    break;
	case MultibufferUpdateActionUntouched:
	    break;
	case MultibufferUpdateActionCopied:
	    if (pPrevBuffer != pNewBuffer)
	    {
		(* pMBPriv->CopyBufferBits) (ppMBWindow[i],
			ppMBBuffer[i]->number, pPrevMBBuffer->number);
	    }
	    break;
	}
    }
}

/* Updates the backBuffer region and paints the selectPlane. */

static void
bufPostValidateTree(pParent, pChild, kind)
    WindowPtr	pParent, pChild;
    VTKind	kind;
{
    ScreenPtr pScreen;
    mbufBufferPrivPtr pMBPriv;

    if (pParent)
	pScreen = pParent->drawable.pScreen;
    else if (pChild)
	pScreen = pChild->drawable.pScreen;
    else
	return; /* Hopeless */

    pMBPriv = MB_SCREEN_PRIV_BUFFER(pScreen);

    UNWRAP_SCREEN_FUNC(pScreen, pMBPriv, void, PostValidateTree);
    if (pScreen->PostValidateTree)
	(* pScreen->PostValidateTree)(pParent, pChild, kind);
    REWRAP_SCREEN_FUNC(pScreen, pMBPriv, void, PostValidateTree);

    /* Does backBuffer need to change? */
    if (pMBPriv->rgnChanged)
    {
	RegionRec exposed;
	RegionPtr pSubtractRgn, pUnionRgn;
	Bool overlap;

	pMBPriv->rgnChanged = FALSE;

	pSubtractRgn = &pMBPriv->subtractRgn;
	pUnionRgn    = &pMBPriv->unionRgn;
	REGION_VALIDATE(pScreen, pSubtractRgn, &overlap);
#ifdef DEBUG
	if (overlap)
	    FatalError("bufPostValidateTree: subtractRgn overlaps");
#endif
	REGION_VALIDATE(pScreen, pUnionRgn, &overlap);
#ifdef DEBUG
	if (overlap)
	    FatalError("bufPostValidateTree: unionRgn overlaps");
#endif

	/* Update backBuffer: subtract must come before union */
	REGION_SUBTRACT(pScreen, &pMBPriv->backBuffer, &pMBPriv->backBuffer,
			      pSubtractRgn);
	REGION_UNION(pScreen, &pMBPriv->backBuffer, &pMBPriv->backBuffer,
			      pUnionRgn);

	/* Paint gained and lost backbuffer areas in select plane */
	REGION_INIT(pScreen, &exposed, NullBox, 0);
	REGION_SUBTRACT(pScreen, &exposed, pSubtractRgn, pUnionRgn);
	(* pMBPriv->DrawSelectPlane)(pScreen, pMBPriv->selectPlane,
				     &exposed, FRONT_BUFFER);

	REGION_SUBTRACT(pScreen, &exposed, pUnionRgn, pSubtractRgn);
	(* pMBPriv->DrawSelectPlane)(pScreen, pMBPriv->selectPlane,
				    &exposed, BACK_BUFFER);
	
	REGION_UNINIT(pScreen, &exposed);
	REGION_EMPTY(pScreen, pSubtractRgn);
	REGION_EMPTY(pScreen, pUnionRgn);
    }
}

/* XXX - Knows region internals. */

static Bool
RegionsEqual(reg1, reg2)
    RegionPtr reg1;
    RegionPtr reg2;
{
    int i;
    BoxPtr rects1, rects2;

    if (reg1->extents.x1 != reg2->extents.x1) return FALSE;
    if (reg1->extents.x2 != reg2->extents.x2) return FALSE;
    if (reg1->extents.y1 != reg2->extents.y1) return FALSE;
    if (reg1->extents.y2 != reg2->extents.y2) return FALSE;
    if (REGION_NUM_RECTS(reg1) != REGION_NUM_RECTS(reg2)) return FALSE;
    
    rects1 = REGION_RECTS(reg1);
    rects2 = REGION_RECTS(reg2);
    for (i = 0; i != REGION_NUM_RECTS(reg1); i++) {
	if (rects1[i].x1 != rects2[i].x1) return FALSE;
	if (rects1[i].x2 != rects2[i].x2) return FALSE;
	if (rects1[i].y1 != rects2[i].y1) return FALSE;
	if (rects1[i].y2 != rects2[i].y2) return FALSE;
    }
    return TRUE;
}

/*
 * If the window is multibuffered and displaying the backbuffer,
 * add the old clipList to the subtractRgn and add the new clipList
 * to the unionRgn. PostValidateTree will use subtractRgn and unionRgn
 * to update the backBuffer region and the selectPlane.
 *
 * Copy changes to the window structure into the buffers.
 * Send ClobberNotify events.
 */

static void
bufClipNotify(pWin, dx,dy)
    WindowPtr pWin;
    int       dx,dy;
{
    ScreenPtr pScreen = pWin->drawable.pScreen;
    mbufBufferPrivPtr pMBPriv = MB_SCREEN_PRIV_BUFFER(pScreen);
    mbufWindowPtr	pMBWindow;
    int i;

    UNWRAP_SCREEN_FUNC(pScreen, pMBPriv, void, ClipNotify);
    if (pScreen->ClipNotify)
	(* pScreen->ClipNotify)(pWin, dx,dy);
    REWRAP_SCREEN_FUNC(pScreen, pMBPriv, void, ClipNotify);

    if (pMBWindow = MB_WINDOW_PRIV(pWin))
    {
	RegionPtr pOldClipList = (RegionPtr) pMBWindow->devPrivate.ptr;

	if (! RegionsEqual(pOldClipList, &pWin->clipList))
	{
	    if (pMBWindow->displayedMultibuffer == BACK_BUFFER)
	    {
		pMBPriv->rgnChanged = TRUE;
		REGION_APPEND(pScreen, &pMBPriv->subtractRgn, pOldClipList);
		REGION_APPEND(pScreen, &pMBPriv->unionRgn, &pWin->clipList);
	    }

	    REGION_COPY(pScreen, pOldClipList,&pWin->clipList);
	}

	/* Update buffer x,y,w,h, and clipList */
	for (i=0; i<pMBWindow->numMultibuffer; i++)
	{
	    mbufBufferPtr pMBBuffer = pMBWindow->buffers + i;
	    if (pMBBuffer->clobber != pWin->visibility)
	    {
		pMBBuffer->clobber = pWin->visibility;
		MultibufferClobber(pMBBuffer);
	    }
	    UpdateBufferFromWindow(pMBBuffer->pDrawable, pWin);
	}
    }
}

/*
 * Updates buffer's background fields when the window's changes.
 * This is necessary because pScreen->PaintWindowBackground
 * is used to paint the buffer.
 *
 * XXBS - Backingstore state will have be tracked too if it is supported.
 */

static Bool
bufChangeWindowAttributes(pWin, mask)
    WindowPtr pWin;
    unsigned long mask;
{
    ScreenPtr pScreen = pWin->drawable.pScreen;
    mbufBufferPrivPtr pMBPriv = MB_SCREEN_PRIV_BUFFER(pScreen);
    mbufWindowPtr pMBWindow;
    Bool ret;

    UNWRAP_SCREEN_FUNC(pScreen, pMBPriv, Bool, ChangeWindowAttributes);
    ret = (* pScreen->ChangeWindowAttributes)(pWin, mask);
    REWRAP_SCREEN_FUNC(pScreen, pMBPriv, Bool, ChangeWindowAttributes);

    if (pMBWindow = MB_WINDOW_PRIV(pWin))
    {
	if (mask & (CWBackPixmap | CWBackPixel))
	{
	    BufferPtr pBuffer;
	    int i;

	    for (i=0; i<pMBWindow->displayedMultibuffer; i++)
	    {
		pBuffer = (BufferPtr) pMBWindow->buffers[i].pDrawable;
		pBuffer->backgroundState = pWin->backgroundState;
		pBuffer->background = pWin->background;
	    }
	}
    }
    return ret;
}

/*
 * Send exposures and clear the background for a buffer whenever
 * its corresponding window is exposed, except when called by
 * ClearToBackground.
 */

static void 
bufWindowExposures(pWin, prgn, other_exposed)
    WindowPtr pWin;
    register RegionPtr prgn, other_exposed;
{
    ScreenPtr pScreen = pWin->drawable.pScreen;
    mbufWindowPtr pMBWindow = MB_WINDOW_PRIV(pWin);
    mbufBufferPrivPtr pMBPriv = MB_SCREEN_PRIV_BUFFER(pScreen);
    RegionRec tmp_rgn;
    int i;
    Bool handleBuffers;

    handleBuffers = (!pMBPriv->inClearToBackground) &&
	(pWin->drawable.type == DRAWABLE_WINDOW) &&
	pMBWindow && (prgn && !REGION_NIL(prgn));

    /* miWindowExposures munges prgn and other_exposed. */
    if (handleBuffers)
    {
	REGION_INIT(pScreen, &tmp_rgn, NullBox, 0);
	REGION_COPY(pScreen, &tmp_rgn,prgn);
    }

    UNWRAP_SCREEN_FUNC(pScreen, pMBPriv, void, WindowExposures);
    (* pScreen->WindowExposures) (pWin, prgn, other_exposed);
    REWRAP_SCREEN_FUNC(pScreen, pMBPriv, void, WindowExposures);

    if (!handleBuffers)
	return;

    /*
     * Send expose events to all clients. Paint the exposed region for all
     * buffers except the displayed buffer since it is handled when the
     * window is painted.
     *
     * XXBS - Will have to be re-written to handle BackingStore on buffers.
     */

    for (i=0; i<pMBWindow->numMultibuffer; i++)
    {
	mbufBufferPtr pMBBuffer;
	BufferPtr pBuffer;

	pMBBuffer = pMBWindow->buffers + i;
	pBuffer = (BufferPtr) pMBBuffer->pDrawable;

	if (i != pMBWindow->displayedMultibuffer)
	    (* pScreen->PaintWindowBackground)(pBuffer,&tmp_rgn,PW_BACKGROUND);
	if ((pMBBuffer->otherEventMask | pMBBuffer->eventMask) & ExposureMask)
	    MultibufferExpose(pMBBuffer, &tmp_rgn);
    }

    REGION_UNINIT(pScreen, &tmp_rgn);
}

/*
 * Set ``inClearToBackground'' so that WindowExposures does not attempt
 * to send expose events or clear the background on the buffers.
 */

static void
bufClearToBackground(pWin, x,y,w,h, sendExpose)
    WindowPtr pWin;
    int x,y, w,h;
    Bool sendExpose;
{
    ScreenPtr pScreen = pWin->drawable.pScreen;
    mbufBufferPrivPtr pMBPriv = MB_SCREEN_PRIV_BUFFER(pScreen);

    pMBPriv->inClearToBackground = TRUE;

    UNWRAP_SCREEN_FUNC(pScreen, pMBPriv, void, ClearToBackground);
    (* pScreen->ClearToBackground)(pWin, x,y,w,h, sendExpose);
    REWRAP_SCREEN_FUNC(pScreen, pMBPriv, void, ClearToBackground);

    pMBPriv->inClearToBackground = FALSE;
}

/*
 * Move bits in both buffers. It does this by calling pScreen->CopyWindow
 * twice, once with the root window's devPrivate[frameWindowPrivateIndex]
 * pointing to the frontbuffer pixmap and once with it pointed to the
 * backbuffer pixmap. It does this if there are *any* existing multibuffered
 * window... a possible optimization is to copy the backbuffer only if this
 * window or its inferiors are multibuffered. May be faster, maybe not.
 *
 * XXX - Only works if your CopyWindow checks the root window's devPrivate
 *       to see which buffer to draw into. Works for cfbPaintWindow.
 */

/*ARGSUSED*/
static void 
bufCopyWindow(pWin, ptOldOrg, prgnSrc)
    WindowPtr pWin;
    DDXPointRec ptOldOrg;
    RegionPtr prgnSrc;
{
    ScreenPtr pScreen = pWin->drawable.pScreen;
    mbufBufferPrivPtr pMBPriv = MB_SCREEN_PRIV_BUFFER(pScreen);
    WindowPtr pwinroot;
    DevUnion save;

    UNWRAP_SCREEN_FUNC(pScreen, pMBPriv, void, CopyWindow);

    pwinroot = WindowTable[pScreen->myNum];
    save = pwinroot->devPrivates[frameWindowPrivateIndex];

    /*
     * Copy front buffer
     */

    pwinroot->devPrivates[frameWindowPrivateIndex] =
	pMBPriv->frameBuffer[FRONT_BUFFER];
    (* pScreen->CopyWindow)(pWin, ptOldOrg, prgnSrc);

    /*
     * Copy back buffer
     */

    /* CopyWindow translates prgnSrc... translate it back for 2nd call. */
    REGION_TRANSLATE(pScreen, prgnSrc,
				  ptOldOrg.x - pWin->drawable.x,
				  ptOldOrg.y - pWin->drawable.y);
    pwinroot->devPrivates[frameWindowPrivateIndex] =
	pMBPriv->frameBuffer[BACK_BUFFER];
    (* pScreen->CopyWindow)(pWin, ptOldOrg, prgnSrc);

    pwinroot->devPrivates[frameWindowPrivateIndex] = save;
    REWRAP_SCREEN_FUNC(pScreen, pMBPriv, void, CopyWindow);
}