mibstore.c

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				    x - pBackingStore->x, y - pBackingStore->y,
				    count, chars);

    EPILOGUE (pGC);

    return result;
}

/*-
 *-----------------------------------------------------------------------
 * miBSImageText8 --
 *	Perform a ImageText8, routing output to backing-store as needed.
 *
 * Results:
 *
 * Side Effects:
 *
 *-----------------------------------------------------------------------
 */
static void
miBSImageText8(pDrawable, pGC, x, y, count, chars)
    DrawablePtr pDrawable;
    GCPtr	pGC;
    int		x, y;
    int		count;
    char	*chars;
{
    SETUP_BACKING (pDrawable, pGC);
    PROLOGUE(pGC);

    (* pGC->ops->ImageText8)(pDrawable, pGC, x, y, count, chars);
    (* pBackingGC->ops->ImageText8)(pBackingDrawable, pBackingGC,
				    x - pBackingStore->x, y - pBackingStore->y,
				    count, chars);

    EPILOGUE (pGC);
}

/*-
 *-----------------------------------------------------------------------
 * miBSImageText16 --
 *	Perform a ImageText16, routing output to backing-store as needed.
 *
 * Results:
 *
 * Side Effects:
 *
 *-----------------------------------------------------------------------
 */
static void
miBSImageText16(pDrawable, pGC, x, y, count, chars)
    DrawablePtr pDrawable;
    GCPtr	pGC;
    int		x, y;
    int		count;
    unsigned short *chars;
{
    SETUP_BACKING (pDrawable, pGC);
    PROLOGUE(pGC);

    (* pGC->ops->ImageText16)(pDrawable, pGC, x, y, count, chars);
    (* pBackingGC->ops->ImageText16)(pBackingDrawable, pBackingGC,
				    x - pBackingStore->x, y - pBackingStore->y,
				     count, chars);

    EPILOGUE (pGC);
}

/*-
 *-----------------------------------------------------------------------
 * miBSImageGlyphBlt --
 *	Perform a ImageGlyphBlt, routing output to backing-store as needed.
 *
 * Results:
 *
 * Side Effects:
 *
 *-----------------------------------------------------------------------
 */
static void
miBSImageGlyphBlt(pDrawable, pGC, x, y, nglyph, ppci, pglyphBase)
    DrawablePtr pDrawable;
    GCPtr 	pGC;
    int 	x, y;
    unsigned int nglyph;
    CharInfoPtr *ppci;		/* array of character info */
    pointer 	pglyphBase;	/* start of array of glyphs */
{
    SETUP_BACKING (pDrawable, pGC);
    PROLOGUE(pGC);

    (* pGC->ops->ImageGlyphBlt)(pDrawable, pGC, x, y, nglyph, ppci,
			     pglyphBase);
    (* pBackingGC->ops->ImageGlyphBlt)(pBackingDrawable, pBackingGC,
				    x - pBackingStore->x, y - pBackingStore->y,
				       nglyph, ppci, pglyphBase);

    EPILOGUE (pGC);
}

/*-
 *-----------------------------------------------------------------------
 * miBSPolyGlyphBlt --
 *	Perform a PolyGlyphBlt, routing output to backing-store as needed.
 *
 * Results:
 *
 * Side Effects:
 *
 *-----------------------------------------------------------------------
 */
static void
miBSPolyGlyphBlt(pDrawable, pGC, x, y, nglyph, ppci, pglyphBase)
    DrawablePtr pDrawable;
    GCPtr	pGC;
    int 	x, y;
    unsigned int nglyph;
    CharInfoPtr *ppci;		/* array of character info */
    pointer	pglyphBase;	/* start of array of glyphs */
{
    SETUP_BACKING (pDrawable, pGC);
    PROLOGUE(pGC);

    (* pGC->ops->PolyGlyphBlt)(pDrawable, pGC, x, y, nglyph,
			    ppci, pglyphBase);
    (* pBackingGC->ops->PolyGlyphBlt)(pBackingDrawable, pBackingGC,
				    x - pBackingStore->x, y - pBackingStore->y,
				      nglyph, ppci, pglyphBase);
    EPILOGUE (pGC);
}

/*-
 *-----------------------------------------------------------------------
 * miBSPushPixels --
 *	Perform a PushPixels, routing output to backing-store as needed.
 *
 * Results:
 *
 * Side Effects:
 *
 *-----------------------------------------------------------------------
 */
static void
miBSPushPixels(pGC, pBitMap, pDst, w, h, x, y)
    GCPtr	pGC;
    PixmapPtr	pBitMap;
    DrawablePtr pDst;
    int		w, h, x, y;
{
    SETUP_BACKING (pDst, pGC);
    PROLOGUE(pGC);

    (* pGC->ops->PushPixels)(pGC, pBitMap, pDst, w, h, x, y);
    if (pGC->miTranslate) {
 	x -= pDst->x;
 	y -= pDst->y;
    }
    (* pBackingGC->ops->PushPixels)(pBackingGC, pBitMap,
			       pBackingDrawable, w, h,
			       x - pBackingStore->x, y - pBackingStore->y);

    EPILOGUE (pGC);
}

#ifdef NEED_LINEHELPER
/*-
 *-----------------------------------------------------------------------
 * miBSLineHelper --
 *
 * Results: should never be called
 *
 * Side Effects: server dies
 *
 *-----------------------------------------------------------------------
 */
static void
miBSLineHelper()
{
    FatalError("miBSLineHelper called\n");
}
#endif

/*-
 *-----------------------------------------------------------------------
 * miBSClearBackingStore --
 *	Clear the given area of the backing pixmap with the background of
 *	the window, whatever it is. If generateExposures is TRUE, generate
 *	exposure events for the area. Note that if the area has any
 *	part outside the saved portions of the window, we do not allow the
 *	count in the expose events to be 0, since there will be more
 *	expose events to come.
 *
 * Results:
 *	None.
 *
 * Side Effects:
 *	Areas of pixmap are cleared and Expose events are generated.
 *
 *-----------------------------------------------------------------------
 */
static RegionPtr
miBSClearBackingStore(pWin, x, y, w, h, generateExposures)
    WindowPtr	  	pWin;
    int	    	  	x;
    int	    	  	y;
    int	    	  	w;
    int	    	  	h;
    Bool    	  	generateExposures;
{
    RegionPtr	  	pRgn;
    int	    	  	i;
    miBSWindowPtr	pBackingStore;
    ScreenPtr	  	pScreen;
    GCPtr   	  	pGC;
    int	    	  	ts_x_origin,
			ts_y_origin;
    pointer    	  	gcvalues[4];
    unsigned long 	gcmask;
    xRectangle	  	*rects;
    BoxPtr  	  	pBox;
    BoxRec  	  	box;
    PixUnion		background;
    char		backgroundState;
    int			numRects;

    pBackingStore = (miBSWindowPtr)pWin->backStorage;
    pScreen = pWin->drawable.pScreen;

    if ((pBackingStore->status == StatusNoPixmap) ||
	(pBackingStore->status == StatusBadAlloc))
	return NullRegion;
    
    if (w == 0)
	w = (int) pWin->drawable.width - x;
    if (h == 0)
	h = (int) pWin->drawable.height - y;

    box.x1 = x;
    box.y1 = y;
    box.x2 = x + w;
    box.y2 = y + h;
    pRgn = REGION_CREATE(pWin->drawable.pScreen, &box, 1);
    if (!pRgn)
	return NullRegion;
    REGION_INTERSECT( pScreen, pRgn, pRgn, &pBackingStore->SavedRegion);

    if (REGION_NOTEMPTY( pScreen, pRgn))
    {
	/*
	 * if clearing entire window, simply make new virtual
	 * tile.  For the root window, we also destroy the pixmap
	 * to save a pile of memory
	 */
	if (x == 0 && y == 0 &&
 	    w == pWin->drawable.width &&
 	    h == pWin->drawable.height)
	{
	    if (!pWin->parent)
		miDestroyBSPixmap (pWin);
	    if (pBackingStore->status != StatusContents)
		 miTileVirtualBS (pWin);
	}

	ts_x_origin = ts_y_origin = 0;

	backgroundState = pWin->backgroundState;
	background = pWin->background;
	if (backgroundState == ParentRelative) {
	    WindowPtr	pParent;

	    pParent = pWin;
	    while (pParent->backgroundState == ParentRelative) {
		ts_x_origin -= pParent->origin.x;
		ts_y_origin -= pParent->origin.y;
		pParent = pParent->parent;
	    }
	    backgroundState = pParent->backgroundState;
	    background = pParent->background;
	}

	if ((backgroundState != None) &&
	    ((pBackingStore->status == StatusContents) ||
	     !SameBackground (pBackingStore->backgroundState,
			      pBackingStore->background,
			      backgroundState,
			      background)))
	{
	    if (!pBackingStore->pBackingPixmap)
		miCreateBSPixmap(pWin, NullBox);

	    pGC = GetScratchGC(pWin->drawable.depth, pScreen);
	    if (pGC && pBackingStore->pBackingPixmap)
	    {
		/*
		 * First take care of any ParentRelative stuff by altering the
		 * tile/stipple origin to match the coordinates of the upper-left
		 * corner of the first ancestor without a ParentRelative background.
		 * This coordinate is, of course, negative.
		 */
	    
		if (backgroundState == BackgroundPixel)
		{
		    gcvalues[0] = (pointer) background.pixel;
		    gcvalues[1] = (pointer)FillSolid;
		    gcmask = GCForeground|GCFillStyle;
		}
		else
		{
		    gcvalues[0] = (pointer)FillTiled;
		    gcvalues[1] = (pointer) background.pixmap;
		    gcmask = GCFillStyle|GCTile;
		}
		gcvalues[2] = (pointer)(ts_x_origin - pBackingStore->x);
		gcvalues[3] = (pointer)(ts_y_origin - pBackingStore->y);
		gcmask |= GCTileStipXOrigin|GCTileStipYOrigin;
		DoChangeGC(pGC, gcmask, (XID *)gcvalues, TRUE);
		ValidateGC((DrawablePtr)pBackingStore->pBackingPixmap, pGC);
    
		/*
		 * Figure out the array of rectangles to fill and fill them with
		 * PolyFillRect in the proper mode, as set in the GC above.
		 */
		numRects = REGION_NUM_RECTS(pRgn);
		rects = (xRectangle *)ALLOCATE_LOCAL(numRects*sizeof(xRectangle));
	    
		if (rects)
		{
		    for (i = 0, pBox = REGION_RECTS(pRgn);
			 i < numRects;
			 i++, pBox++)
		    {
			rects[i].x = pBox->x1 - pBackingStore->x;
			rects[i].y = pBox->y1 - pBackingStore->y;
			rects[i].width = pBox->x2 - pBox->x1;
			rects[i].height = pBox->y2 - pBox->y1;
		    }
		    (* pGC->ops->PolyFillRect) (
				(DrawablePtr)pBackingStore->pBackingPixmap,
				       pGC, numRects, rects);
		    DEALLOCATE_LOCAL(rects);
		}	
		FreeScratchGC(pGC);
	    }
	}	

	if (!generateExposures)
 	{
	    REGION_DESTROY(pScreen, pRgn);
	    pRgn = NULL;
	}
	else
	{
	    /*
	     * result must be screen relative, but is currently
	     * drawable relative.
	     */
	    REGION_TRANSLATE(pScreen, pRgn, pWin->drawable.x,
			     pWin->drawable.y);
	}
    }
    else
    {
	REGION_DESTROY( pScreen, pRgn);
	pRgn = NULL;
    }
    return pRgn;
}

static void
miBSClearBackingRegion (pWin, pRgn)
    WindowPtr	pWin;
    RegionPtr	pRgn;
{
    BoxPtr	pBox;
    int		i;

    i = REGION_NUM_RECTS(pRgn);
    pBox = REGION_RECTS(pRgn);
    while (i--)
    {
	(void) miBSClearBackingStore(pWin, pBox->x1, pBox->y1,
					pBox->x2 - pBox->x1,
					pBox->y2 - pBox->y1,
					FALSE);
	pBox++;
    }
}

/*
 * fill a region of the destination with virtual bits
 *
 * pRgn is to be translated by (x,y)
 */

static void
miBSFillVirtualBits (pDrawable, pGC, pRgn, x, y, state, pixunion, planeMask)
    DrawablePtr		pDrawable;
    GCPtr		pGC;
    RegionPtr		pRgn;
    int			x, y;
    int			state;
    PixUnion		pixunion;
    unsigned long	planeMask;
{
    int		i;
    BITS32	gcmask;
    pointer	gcval[5];
    xRectangle	*pRect;
    BoxPtr	pBox;
    WindowPtr	pWin;
    int		numRects;

    if (state == None)
	return;
    numRects = REGION_NUM_RECTS(pRgn);
    pRect = (xRectangle *)ALLOCATE_LOCAL(numRects * sizeof(xRectangle));
    if (!pRect)
	return;
    pWin = 0;
    if (pDrawable->type != DRAWABLE_PIXMAP)
    {
	pWin = (WindowPtr) pDrawable;
	if (!pWin->backStorage)
	    pWin = 0;
    }
    i = 0;
    gcmask = 0;
    gcval[i++] = (pointer)planeMask;
    gcmask |= GCPlaneMask;
    if (state == BackgroundPixel)
    {
	if (pGC->fgPixel != pixunion.pixel)
	{
	    gcval[i++] = (pointer)pixunion.pixel;
	    gcmask |= GCForeground;
	}
	if (pGC->fillStyle != FillSolid)
	{
	    gcval[i++] = (pointer)FillSolid;
	    gcmask |= GCFillStyle;
	}
    }
    else
    {
	if (pGC->fillStyle != FillTiled)
	{
	    gcval[i++] = (pointer)FillTiled;
	    gcmask |= GCFillStyle;
	}
	if (pGC->tileIsPixel || pGC->tile.pixmap != pixunion.pixmap)
	{
	    gcval[i++] = (pointer)pixunion.pixmap;
	    gcmask |= GCTile;
	}
	if (pGC->patOrg.x != x)
	{
	    gcval[i++] = (pointer)x;
	    gcmask |= GCTileStipXOrigin;
	}
	if (pGC->patOrg.y != y)
	{
	    gcval[i++] = (pointer)y;
	    gcmask |= GCTileStipYOrigin;
	}
    }
    if (gcmask)
	DoChangeGC (pGC, gcmask, (XID *)gcval, 1);

    if (pWin)
	(*pWin->drawable.pScreen->DrawGuarantee) (pWin, pGC, GuaranteeVisBack);

    if (pDrawable->serialNumber != pGC->serialNumber)
	ValidateGC (pDrawable, pGC);

    pBox = REGION_RECTS(pRgn);
    for (i = numRects; --i >= 0; pBox++, pRect++)
    {
    	pRect->x = pBox->x1 + x;
	pRect->y = pBox->y1 + y;
	pRect->width = pBox->x2 - pBox->x1;
	pRect->height = pBox->y2 - pBox->y1;
    }
    pRect -= numRects;
    (*pGC->ops->PolyFillRect) (pDrawable, pGC, numRects, pRect);
    if (pWin)
	(*pWin->drawable.pScreen->DrawGuarantee) (pWin, pGC, GuaranteeNothing);
    DEALLOCATE_LOCAL (pRect);
}

/*-
 *-----------------------------------------------------------------------
 * miBSAllocate --
 *	Create and install backing store info for a window
 *
 *-------------------------------------------------------------