initial state (xorg-server 1.10.2)

1 files changed, 697 insertions, 0 deletions

diff --git a/mi/miexpose.c b/mi/miexpose.c
new file mode 100644
index 0000000..94258b8
--- /dev/null
+++ b/mi/miexpose.c
@@ -0,0 +1,697 @@
+/***********************************************************
+
+Copyright 1987, 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.
+
+
+Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.
+
+                        All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and its 
+documentation for any purpose and without fee is hereby granted, 
+provided that the above copyright notice appear in all copies and that
+both that copyright notice and this permission notice appear in 
+supporting documentation, and that the name of Digital not be
+used in advertising or publicity pertaining to distribution of the
+software without specific, written prior permission.  
+
+DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
+ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
+DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
+ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
+ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+SOFTWARE.
+
+******************************************************************/
+/*****************************************************************
+
+Copyright (c) 1991, 1997 Digital Equipment Corporation, Maynard, Massachusetts.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software.
+
+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
+DIGITAL EQUIPMENT CORPORATION BE LIABLE FOR ANY CLAIM, DAMAGES, INCLUDING,
+BUT NOT LIMITED TO CONSEQUENTIAL OR INCIDENTAL 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 Digital Equipment Corporation
+shall not be used in advertising or otherwise to promote the sale, use or other
+dealings in this Software without prior written authorization from Digital
+Equipment Corporation.
+
+******************************************************************/
+
+
+#ifdef HAVE_DIX_CONFIG_H
+#include <dix-config.h>
+#endif
+
+#include <X11/X.h>
+#include <X11/Xproto.h>
+#include <X11/Xprotostr.h>
+
+#include "misc.h"
+#include "regionstr.h"
+#include "scrnintstr.h"
+#include "gcstruct.h"
+#include "windowstr.h"
+#include "pixmap.h"
+#include "input.h"
+
+#include "dixstruct.h"
+#include "mi.h"
+#include <X11/Xmd.h>
+
+#include "globals.h"
+
+#ifdef PANORAMIX
+#include "panoramiX.h"
+#include "panoramiXsrv.h"
+#endif
+
+/*
+    machine-independent graphics exposure code.  any device that uses
+the region package can call this.
+*/
+
+#ifndef RECTLIMIT
+#define RECTLIMIT 25		/* pick a number, any number > 8 */
+#endif
+
+/* miHandleExposures 
+    generate a region for exposures for areas that were copied from obscured or
+non-existent areas to non-obscured areas of the destination.  Paint the
+background for the region, if the destination is a window.
+
+NOTE:
+     this should generally be called, even if graphicsExposures is false,
+because this is where bits get recovered from backing store.
+
+NOTE:
+     added argument 'plane' is used to indicate how exposures from backing
+store should be accomplished. If plane is 0 (i.e. no bit plane), CopyArea
+should be used, else a CopyPlane of the indicated plane will be used. The
+exposing is done by the backing store's GraphicsExpose function, of course.
+
+*/
+
+RegionPtr
+miHandleExposures(DrawablePtr pSrcDrawable, DrawablePtr pDstDrawable,
+		  GCPtr pGC, int srcx, int srcy, int width, int height,
+		  int dstx, int dsty, unsigned long plane)
+{
+    RegionPtr prgnSrcClip;	/* drawable-relative source clip */
+    RegionRec rgnSrcRec;
+    RegionPtr prgnDstClip;	/* drawable-relative dest clip */
+    RegionRec rgnDstRec;
+    BoxRec srcBox;		/* unclipped source */
+    RegionRec rgnExposed;	/* exposed region, calculated source-
+				   relative, made dst relative to
+				   intersect with visible parts of
+				   dest and send events to client, 
+				   and then screen relative to paint 
+				   the window background
+				*/
+    WindowPtr pSrcWin;
+    BoxRec expBox;
+    Bool extents;
+
+    /* avoid work if we can */
+    if (!pGC->graphicsExposures &&
+	(pDstDrawable->type == DRAWABLE_PIXMAP) &&
+	((pSrcDrawable->type == DRAWABLE_PIXMAP) ||
+	 (((WindowPtr)pSrcDrawable)->backStorage == NULL)))
+	return NULL;
+	
+    srcBox.x1 = srcx;
+    srcBox.y1 = srcy;
+    srcBox.x2 = srcx+width;
+    srcBox.y2 = srcy+height;
+
+    if (pSrcDrawable->type != DRAWABLE_PIXMAP)
+    {
+	BoxRec TsrcBox;
+
+	TsrcBox.x1 = srcx + pSrcDrawable->x;
+	TsrcBox.y1 = srcy + pSrcDrawable->y;
+	TsrcBox.x2 = TsrcBox.x1 + width;
+	TsrcBox.y2 = TsrcBox.y1 + height;
+	pSrcWin = (WindowPtr) pSrcDrawable;
+	if (pGC->subWindowMode == IncludeInferiors)
+ 	{
+	    prgnSrcClip = NotClippedByChildren (pSrcWin);
+	    if ((RegionContainsRect(prgnSrcClip, &TsrcBox)) == rgnIN)
+	    {
+		RegionDestroy(prgnSrcClip);
+		return NULL;
+	    }
+	}
+ 	else
+ 	{
+	    if ((RegionContainsRect(&pSrcWin->clipList, &TsrcBox)) == rgnIN)
+		return NULL;
+	    prgnSrcClip = &rgnSrcRec;
+	    RegionNull(prgnSrcClip);
+	    RegionCopy(prgnSrcClip, &pSrcWin->clipList);
+	}
+	RegionTranslate(prgnSrcClip,
+				-pSrcDrawable->x, -pSrcDrawable->y);
+    }
+    else
+    {
+	BoxRec	box;
+
+	if ((srcBox.x1 >= 0) && (srcBox.y1 >= 0) &&
+	    (srcBox.x2 <= pSrcDrawable->width) &&
+ 	    (srcBox.y2 <= pSrcDrawable->height))
+	    return NULL;
+
+	box.x1 = 0;
+	box.y1 = 0;
+	box.x2 = pSrcDrawable->width;
+	box.y2 = pSrcDrawable->height;
+	prgnSrcClip = &rgnSrcRec;
+	RegionInit(prgnSrcClip, &box, 1);
+	pSrcWin = NULL;
+    }
+
+    if (pDstDrawable == pSrcDrawable)
+    {
+	prgnDstClip = prgnSrcClip;
+    }
+    else if (pDstDrawable->type != DRAWABLE_PIXMAP)
+    {
+	if (pGC->subWindowMode == IncludeInferiors)
+	{
+	    prgnDstClip = NotClippedByChildren((WindowPtr)pDstDrawable);
+	}
+	else
+	{
+	    prgnDstClip = &rgnDstRec;
+	    RegionNull(prgnDstClip);
+	    RegionCopy(prgnDstClip,
+				&((WindowPtr)pDstDrawable)->clipList);
+	}
+	RegionTranslate(prgnDstClip,
+				 -pDstDrawable->x, -pDstDrawable->y);
+    }
+    else
+    {
+	BoxRec	box;
+
+	box.x1 = 0;
+	box.y1 = 0;
+	box.x2 = pDstDrawable->width;
+	box.y2 = pDstDrawable->height;
+	prgnDstClip = &rgnDstRec;
+	RegionInit(prgnDstClip, &box, 1);
+    }
+
+    /* drawable-relative source region */
+    RegionInit(&rgnExposed, &srcBox, 1);
+
+    /* now get the hidden parts of the source box*/
+    RegionSubtract(&rgnExposed, &rgnExposed, prgnSrcClip);
+
+    /* move them over the destination */
+    RegionTranslate(&rgnExposed, dstx-srcx, dsty-srcy);
+
+    /* intersect with visible areas of dest */
+    RegionIntersect(&rgnExposed, &rgnExposed, prgnDstClip);
+
+    /* intersect with client clip region. */
+    if (pGC->clientClipType == CT_REGION)
+	RegionIntersect(&rgnExposed, &rgnExposed, pGC->clientClip);
+
+    /*
+     * If we have LOTS of rectangles, we decide to take the extents
+     * and force an exposure on that.  This should require much less
+     * work overall, on both client and server.  This is cheating, but
+     * isn't prohibited by the protocol ("spontaneous combustion" :-)
+     * for windows.
+     */
+    extents = pGC->graphicsExposures &&
+	      (RegionNumRects(&rgnExposed) > RECTLIMIT) &&
+	      (pDstDrawable->type != DRAWABLE_PIXMAP);
+    if (pSrcWin)
+    {
+	RegionPtr	region;
+    	if (!(region = wClipShape (pSrcWin)))
+    	    region = wBoundingShape (pSrcWin);
+    	/*
+     	 * If you try to CopyArea the extents of a shaped window, compacting the
+     	 * exposed region will undo all our work!
+     	 */
+    	if (extents && pSrcWin && region &&
+	    (RegionContainsRect(region, &srcBox) != rgnIN))
+	    	extents = FALSE;
+    }
+    if (extents)
+    {
+	expBox = *RegionExtents(&rgnExposed);
+	RegionReset(&rgnExposed, &expBox);
+    }
+    if ((pDstDrawable->type != DRAWABLE_PIXMAP) &&
+	(((WindowPtr)pDstDrawable)->backgroundState != None))
+    {
+	WindowPtr pWin = (WindowPtr)pDstDrawable;
+
+	/* make the exposed area screen-relative */
+	RegionTranslate(&rgnExposed,
+				 pDstDrawable->x, pDstDrawable->y);
+
+	if (extents)
+	{
+	    /* miPaintWindow doesn't clip, so we have to */
+	    RegionIntersect(&rgnExposed, &rgnExposed, &pWin->clipList);
+	}
+	miPaintWindow((WindowPtr)pDstDrawable, &rgnExposed, PW_BACKGROUND);
+
+	if (extents)
+	{
+	    RegionReset(&rgnExposed, &expBox);
+	}
+	else
+	    RegionTranslate(&rgnExposed,
+				     -pDstDrawable->x, -pDstDrawable->y);
+    }
+    if (prgnDstClip == &rgnDstRec)
+    {
+	RegionUninit(prgnDstClip);
+    }
+    else if (prgnDstClip != prgnSrcClip)
+    {
+	RegionDestroy(prgnDstClip);
+    }
+
+    if (prgnSrcClip == &rgnSrcRec)
+    {
+	RegionUninit(prgnSrcClip);
+    }
+    else
+    {
+	RegionDestroy(prgnSrcClip);
+    }
+
+    if (pGC->graphicsExposures)
+    {
+	/* don't look */
+	RegionPtr exposed = RegionCreate(NullBox, 0);
+	*exposed = rgnExposed;
+	return exposed;
+    }
+    else
+    {
+	RegionUninit(&rgnExposed);
+	return NULL;
+    }
+}
+
+/* send GraphicsExpose events, or a NoExpose event, based on the region */
+
+void
+miSendGraphicsExpose (ClientPtr client, RegionPtr pRgn, XID drawable,
+                      int major, int minor)
+{
+    if (pRgn && !RegionNil(pRgn))
+    {
+        xEvent *pEvent;
+	xEvent *pe;
+	BoxPtr pBox;
+	int i;
+	int numRects;
+
+	numRects = RegionNumRects(pRgn);
+	pBox = RegionRects(pRgn);
+	if(!(pEvent = malloc(numRects * sizeof(xEvent))))
+		return;
+	pe = pEvent;
+
+	for (i=1; i<=numRects; i++, pe++, pBox++)
+	{
+	    pe->u.u.type = GraphicsExpose;
+	    pe->u.graphicsExposure.drawable = drawable;
+	    pe->u.graphicsExposure.x = pBox->x1;
+	    pe->u.graphicsExposure.y = pBox->y1;
+	    pe->u.graphicsExposure.width = pBox->x2 - pBox->x1;
+	    pe->u.graphicsExposure.height = pBox->y2 - pBox->y1;
+	    pe->u.graphicsExposure.count = numRects - i;
+	    pe->u.graphicsExposure.majorEvent = major;
+	    pe->u.graphicsExposure.minorEvent = minor;
+	}
+	/* GraphicsExpose is a "critical event", which TryClientEvents
+	 * handles specially. */
+	TryClientEvents(client, NULL, pEvent, numRects,
+			    (Mask)0, NoEventMask, NullGrab);
+	free(pEvent);
+    }
+    else
+    {
+        xEvent event;
+	memset(&event, 0, sizeof(xEvent));
+	event.u.u.type = NoExpose;
+	event.u.noExposure.drawable = drawable;
+	event.u.noExposure.majorEvent = major;
+	event.u.noExposure.minorEvent = minor;
+	WriteEventsToClient(client, 1, &event);
+    }
+}
+
+
+void
+miSendExposures( WindowPtr pWin, RegionPtr pRgn, int dx, int dy)
+{
+    BoxPtr pBox;
+    int numRects;
+    xEvent *pEvent, *pe;
+    int i;
+
+    pBox = RegionRects(pRgn);
+    numRects = RegionNumRects(pRgn);
+    if(!(pEvent = calloc(1, numRects * sizeof(xEvent))))
+	return;
+
+    for (i=numRects, pe = pEvent; --i >= 0; pe++, pBox++)
+    {
+	pe->u.u.type = Expose;
+	pe->u.expose.window = pWin->drawable.id;
+	pe->u.expose.x = pBox->x1 - dx;
+	pe->u.expose.y = pBox->y1 - dy;
+	pe->u.expose.width = pBox->x2 - pBox->x1;
+	pe->u.expose.height = pBox->y2 - pBox->y1;
+	pe->u.expose.count = i;
+    }
+
+#ifdef PANORAMIX
+    if(!noPanoramiXExtension) {
+	int scrnum = pWin->drawable.pScreen->myNum;
+	int x = 0, y = 0;
+	XID realWin = 0;
+
+	if(!pWin->parent) {
+	    x = screenInfo.screens[scrnum]->x;
+	    y = screenInfo.screens[scrnum]->y;
+	    pWin = screenInfo.screens[0]->root;
+	    realWin = pWin->drawable.id;
+	} else if (scrnum) {
+	    PanoramiXRes *win;
+	    win = PanoramiXFindIDByScrnum(XRT_WINDOW, 
+			pWin->drawable.id, scrnum);
+	    if(!win) {
+		free(pEvent);
+		return;
+	    }
+	    realWin = win->info[0].id;
+	    dixLookupWindow(&pWin, realWin, serverClient, DixSendAccess);
+	}
+	if(x || y || scrnum)
+	  for (i = 0; i < numRects; i++) {
+	      pEvent[i].u.expose.window = realWin;
+	      pEvent[i].u.expose.x += x;
+	      pEvent[i].u.expose.y += y;
+	  }
+    }
+#endif
+
+    DeliverEvents(pWin, pEvent, numRects, NullWindow);
+
+    free(pEvent);
+}
+
+void
+miWindowExposures( WindowPtr pWin, RegionPtr prgn, RegionPtr other_exposed)
+{
+    RegionPtr   exposures = prgn;
+    if ((prgn && !RegionNil(prgn)) ||
+	(exposures && !RegionNil(exposures)) || other_exposed)
+    {
+	RegionRec   expRec;
+	int	    clientInterested;
+
+	/*
+	 * Restore from backing-store FIRST.
+	 */
+	clientInterested = (pWin->eventMask|wOtherEventMasks(pWin)) & ExposureMask;
+	if (other_exposed)
+	{
+	    if (exposures)
+	    {
+		RegionUnion(other_exposed,
+						  exposures,
+					          other_exposed);
+		if (exposures != prgn)
+		    RegionDestroy(exposures);
+	    }
+	    exposures = other_exposed;
+	}
+	if (clientInterested && exposures && (RegionNumRects(exposures) > RECTLIMIT))
+	{
+	    /*
+	     * If we have LOTS of rectangles, we decide to take the extents
+	     * and force an exposure on that.  This should require much less
+	     * work overall, on both client and server.  This is cheating, but
+	     * isn't prohibited by the protocol ("spontaneous combustion" :-).
+	     */
+	    BoxRec box;
+
+	    box = *RegionExtents(exposures);
+	    if (exposures == prgn) {
+		exposures = &expRec;
+		RegionInit(exposures, &box, 1);
+		RegionReset(prgn, &box);
+	    } else {
+		RegionReset(exposures, &box);
+		RegionUnion(prgn, prgn, exposures);
+	    }
+	    /* miPaintWindow doesn't clip, so we have to */
+	    RegionIntersect(prgn, prgn, &pWin->clipList);
+	}
+	if (prgn && !RegionNil(prgn))
+	    miPaintWindow(pWin, prgn, PW_BACKGROUND);
+	if (clientInterested && exposures && !RegionNil(exposures))
+	    miSendExposures(pWin, exposures,
+			    pWin->drawable.x, pWin->drawable.y);
+	if (exposures == &expRec)
+	{
+	    RegionUninit(exposures);
+	}
+	else if (exposures && exposures != prgn && exposures != other_exposed)
+	    RegionDestroy(exposures);
+	if (prgn)
+	    RegionEmpty(prgn);
+    }
+    else if (exposures && exposures != prgn)
+	RegionDestroy(exposures);
+}
+
+#ifdef ROOTLESS
+/* Ugly, ugly, but we lost our hooks into miPaintWindow... =/ */
+void RootlessSetPixmapOfAncestors(WindowPtr pWin);
+void RootlessStartDrawing(WindowPtr pWin);
+void RootlessDamageRegion(WindowPtr pWin, RegionPtr prgn);
+Bool IsFramedWindow(WindowPtr pWin);
+#endif 
+
+void
+miPaintWindow(WindowPtr pWin, RegionPtr prgn, int what)
+{
+    ScreenPtr	pScreen = pWin->drawable.pScreen;
+    ChangeGCVal gcval[6];
+    BITS32	gcmask;
+    GCPtr	pGC;
+    int		i;
+    BoxPtr	pbox;
+    xRectangle	*prect;
+    int		numRects;
+    /*
+     * Distance from screen to destination drawable, use this
+     * to adjust rendering coordinates which come in in screen space
+     */
+    int		draw_x_off, draw_y_off;
+    /*
+     * Tile offset for drawing; these need to align the tile
+     * to the appropriate window origin
+     */
+    int		tile_x_off, tile_y_off;
+    PixUnion	fill;
+    Bool	solid = TRUE;
+    DrawablePtr	drawable = &pWin->drawable;
+
+#ifdef ROOTLESS
+    if(!drawable || drawable->type == UNDRAWABLE_WINDOW)
+	return;
+
+    if(IsFramedWindow(pWin)) {
+        RootlessStartDrawing(pWin);
+        RootlessDamageRegion(pWin, prgn);
+    
+        if(pWin->backgroundState == ParentRelative) {
+            if((what == PW_BACKGROUND) || 
+               (what == PW_BORDER && !pWin->borderIsPixel))
+                RootlessSetPixmapOfAncestors(pWin);
+        }
+    }
+#endif
+    
+    if (what == PW_BACKGROUND)
+    {
+	while (pWin->backgroundState == ParentRelative)
+	    pWin = pWin->parent;
+
+	draw_x_off = drawable->x;
+	draw_y_off = drawable->y;
+
+	tile_x_off = pWin->drawable.x - draw_x_off;
+	tile_y_off = pWin->drawable.y - draw_y_off;
+	fill = pWin->background;
+	switch (pWin->backgroundState) {
+	case None:
+	    return;
+	case BackgroundPixmap:
+	    solid = FALSE;
+	    break;
+	}
+    }
+    else
+    {
+	PixmapPtr   pixmap;
+
+	tile_x_off = drawable->x;
+	tile_y_off = drawable->y;
+	
+	/* servers without pixmaps draw their own borders */
+	if (!pScreen->GetWindowPixmap)
+	    return;
+	pixmap = (*pScreen->GetWindowPixmap) ((WindowPtr) drawable);
+	drawable = &pixmap->drawable;
+#ifdef COMPOSITE
+	draw_x_off = pixmap->screen_x;
+	draw_y_off = pixmap->screen_y;
+	tile_x_off -= draw_x_off;
+	tile_y_off -= draw_y_off;
+#else
+	draw_x_off = 0;
+	draw_y_off = 0;
+#endif
+	fill = pWin->border;
+	solid = pWin->borderIsPixel;
+    }
+    
+    gcval[0].val = GXcopy;
+    gcmask = GCFunction;
+
+#ifdef ROOTLESS_SAFEALPHA
+/* Bit mask for alpha channel with a particular number of bits per
+ * pixel. Note that we only care for 32bpp data. Mac OS X uses planar
+ * alpha for 16bpp.
+ */
+#define RootlessAlphaMask(bpp) ((bpp) == 32 ? 0xFF000000 : 0)
+#endif
+    
+    if (solid)
+    {
+#ifdef ROOTLESS_SAFEALPHA
+	gcval[1].val = fill.pixel | RootlessAlphaMask(pWin->drawable.bitsPerPixel);
+#else
+	gcval[1].val = fill.pixel;
+#endif
+	gcval[2].val  = FillSolid;
+	gcmask |= GCForeground | GCFillStyle;
+    }
+    else
+    {
+	int c=1;
+#ifdef ROOTLESS_SAFEALPHA
+	gcval[c++].val = ((CARD32)-1) & ~RootlessAlphaMask(pWin->drawable.bitsPerPixel);
+	gcmask |= GCPlaneMask;
+#endif
+	gcval[c++].val = FillTiled;
+	gcval[c++].ptr = (pointer)fill.pixmap;
+	gcval[c++].val = tile_x_off;
+	gcval[c++].val = tile_y_off;
+	gcmask |= GCFillStyle | GCTile | GCTileStipXOrigin | GCTileStipYOrigin;
+    }
+
+    prect = malloc(RegionNumRects(prgn) * sizeof(xRectangle));
+    if (!prect)
+	return;
+
+    pGC = GetScratchGC(drawable->depth, drawable->pScreen);
+    if (!pGC)
+    {
+	free(prect);
+	return;
+    }
+    
+    ChangeGC (NullClient, pGC, gcmask, gcval);
+    ValidateGC (drawable, pGC);
+
+    numRects = RegionNumRects(prgn);
+    pbox = RegionRects(prgn);
+    for (i= numRects; --i >= 0; pbox++, prect++)
+    {
+	prect->x = pbox->x1 - draw_x_off;
+	prect->y = pbox->y1 - draw_y_off;
+	prect->width = pbox->x2 - pbox->x1;
+	prect->height = pbox->y2 - pbox->y1;
+    }
+    prect -= numRects;
+    (*pGC->ops->PolyFillRect)(drawable, pGC, numRects, prect);
+    free(prect);
+
+    FreeScratchGC(pGC);
+}
+
+
+/* MICLEARDRAWABLE -- sets the entire drawable to the background color of
+ * the GC.  Useful when we have a scratch drawable and need to initialize 
+ * it. */
+void
+miClearDrawable(DrawablePtr pDraw, GCPtr pGC)
+{
+    ChangeGCVal fg, bg;
+    xRectangle rect;
+
+    fg.val = pGC->fgPixel;
+    bg.val = pGC->bgPixel;
+    rect.x = 0;
+    rect.y = 0;
+    rect.width = pDraw->width;
+    rect.height = pDraw->height;
+    ChangeGC(NullClient, pGC, GCForeground, &bg);
+    ValidateGC(pDraw, pGC);
+    (*pGC->ops->PolyFillRect)(pDraw, pGC, 1, &rect);
+    ChangeGC(NullClient, pGC, GCForeground, &fg);
+    ValidateGC(pDraw, pGC);
+}