1 files changed, 416 insertions, 421 deletions
diff --git a/xorg-server/hw/dmx/dmxgc.c b/xorg-server/hw/dmx/dmxgc.c
index 10e93c110..f10f9a074 100644
--- a/xorg-server/hw/dmx/dmxgc.c
+++ b/xorg-server/hw/dmx/dmxgc.c
@@ -1,421 +1,416 @@
-/*
- * Copyright 2001-2004 Red Hat Inc., Durham, North Carolina.
- *
- * All Rights Reserved.
- *
- * 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 on the rights to use, copy, modify, merge,
- * publish, distribute, sublicense, and/or sell copies of the Software,
- * and to permit persons to whom the Software is furnished to do so,
- * subject to the following conditions:
- *
- * The above copyright notice and this permission notice (including the
- * next paragraph) 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
- * NON-INFRINGEMENT.  IN NO EVENT SHALL RED HAT AND/OR THEIR SUPPLIERS
- * 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.
- */
-
-/*
- * Authors:
- *   Kevin E. Martin <kem@redhat.com>
- *
- */
-
-/** \file
- * This file provides support for GCs. */
-
-#ifdef HAVE_DMX_CONFIG_H
-#include <dmx-config.h>
-#endif
-
-#include "dmx.h"
-#include "dmxsync.h"
-#include "dmxgc.h"
-#include "dmxgcops.h"
-#include "dmxpixmap.h"
-#include "dmxfont.h"
-
-#include "gcstruct.h"
-#include "pixmapstr.h"
-#include "migc.h"
-
-static GCFuncs dmxGCFuncs = {
-    dmxValidateGC,
-    dmxChangeGC,
-    dmxCopyGC,
-    dmxDestroyGC,
-    dmxChangeClip,
-    dmxDestroyClip,
-    dmxCopyClip,
-};
-
-static GCOps dmxGCOps = {
-    dmxFillSpans,
-    dmxSetSpans,
-    dmxPutImage,
-    dmxCopyArea,
-    dmxCopyPlane,
-    dmxPolyPoint,
-    dmxPolylines,
-    dmxPolySegment,
-    dmxPolyRectangle,
-    dmxPolyArc,
-    dmxFillPolygon,
-    dmxPolyFillRect,
-    dmxPolyFillArc,
-    dmxPolyText8,
-    dmxPolyText16,
-    dmxImageText8,
-    dmxImageText16,
-    dmxImageGlyphBlt,
-    dmxPolyGlyphBlt,
-    dmxPushPixels
-};
-
-/** Initialize the GC on \a pScreen */
-Bool dmxInitGC(ScreenPtr pScreen)
-{
-    if (!dixRegisterPrivateKey(&dmxGCPrivateKeyRec, PRIVATE_GC, sizeof(dmxGCPrivRec)))
-            return FALSE;
-    return TRUE;
-}
-
-/** Create the GC on the back-end server. */
-void dmxBECreateGC(ScreenPtr pScreen, GCPtr pGC)
-{
-    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];
-    dmxGCPrivPtr   pGCPriv = DMX_GET_GC_PRIV(pGC);
-    int            i;
-
-    for (i = 0; i < dmxScreen->beNumPixmapFormats; i++) {
-	if (pGC->depth == dmxScreen->bePixmapFormats[i].depth) {
-	    unsigned long  mask;
-	    XGCValues      gcvals;
-
-	    mask = GCGraphicsExposures;
-	    gcvals.graphics_exposures = FALSE;
-
-	    /* Create GC in the back-end servers */
-	    pGCPriv->gc = XCreateGC(dmxScreen->beDisplay,
-				    dmxScreen->scrnDefDrawables[i],
-				    mask, &gcvals);
-	    break;
-	}
-    }
-}
-
-/** Create a graphics context on the back-end server associated /a pGC's
- *  screen. */
-Bool dmxCreateGC(GCPtr pGC)
-{
-    ScreenPtr      pScreen = pGC->pScreen;
-    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];
-    dmxGCPrivPtr   pGCPriv = DMX_GET_GC_PRIV(pGC);
-    Bool           ret;
-
-    DMX_UNWRAP(CreateGC, dmxScreen, pScreen);
-    if ((ret = pScreen->CreateGC(pGC))) {
-	/* Save the old funcs */
-	pGCPriv->funcs = pGC->funcs;
-	pGCPriv->ops   = NULL;
-
-	pGC->funcs = &dmxGCFuncs;
-
-	if (dmxScreen->beDisplay) {
-	    dmxBECreateGC(pScreen, pGC);
-	} else {
-	    pGCPriv->gc = NULL;
-	}
-
-	/* Check for "magic special case"
-	 * 1. see CreateGC in dix/gc.c for more info
-	 * 2. see dmxChangeGC for more info
-	 */
-	pGCPriv->msc = (!pGC->tileIsPixel && !pGC->tile.pixmap);
-    }
-    DMX_WRAP(CreateGC, dmxCreateGC, dmxScreen, pScreen);
-
-    return ret;
-}
-
-/** Validate a graphics context, \a pGC, locally in the DMX server and
- *  recompute the composite clip, if necessary. */
-void dmxValidateGC(GCPtr pGC, unsigned long changes, DrawablePtr pDrawable)
-{
-    dmxGCPrivPtr pGCPriv = DMX_GET_GC_PRIV(pGC);
-
-    DMX_GC_FUNC_PROLOGUE(pGC);
-#if 0
-    pGC->funcs->ValidateGC(pGC, changes, pDrawable);
-#endif
-
-    if (pDrawable->type == DRAWABLE_WINDOW ||
-	pDrawable->type == DRAWABLE_PIXMAP) {
-	/* Save the old ops, since we're about to change the ops in the
-	 * epilogue.
-	 */
-	pGCPriv->ops = pGC->ops;
-    } else {
-	pGCPriv->ops = NULL;
-    }
-
-    /* If the client clip is different or moved OR the subwindowMode has
-     * changed OR the window's clip has changed since the last
-     * validation, then we need to recompute the composite clip.
-     */
-    if ((changes & (GCClipXOrigin |
-		    GCClipYOrigin |
-		    GCClipMask |
-		    GCSubwindowMode)) ||
-	(pDrawable->serialNumber !=
-	 (pGC->serialNumber & DRAWABLE_SERIAL_BITS))) {
-	miComputeCompositeClip(pGC, pDrawable);
-    }
-
-    DMX_GC_FUNC_EPILOGUE(pGC);
-}
-
-/** Set the values in the graphics context on the back-end server
- *  associated with \a pGC's screen. */
-void dmxChangeGC(GCPtr pGC, unsigned long mask)
-{
-    ScreenPtr      pScreen = pGC->pScreen;
-    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];
-    dmxGCPrivPtr   pGCPriv = DMX_GET_GC_PRIV(pGC);
-    XGCValues      v;
-
-    DMX_GC_FUNC_PROLOGUE(pGC);
-#if 0
-    pGC->funcs->ChangeGC(pGC, mask);
-#endif
-
-    /* Handle "magic special case" from CreateGC */
-    if (pGCPriv->msc) {
-	/* The "magic special case" is used to handle the case where a
-	 * foreground pixel is set when the GC is created so that a
-	 * "pseudo default-tile" can be created and used in case the
-	 * fillstyle was set to FillTiled.  This specific case is tested
-	 * in xtest (XCreateGC test #3).  What has happened in dix by
-	 * the time it reaches here is (1) the pGC->tile.pixel has been
-	 * set to pGC->fgPixel and pGC->tileIsPixel is set, (2) if a
-	 * tile has also been set, then pGC->tileIsPixel is unset and
-	 * pGC->tile.pixmap is initialized; else, the default tile is
-	 * created and pGC->tileIsPixel is unset and pGC->tile.pixmap is
-	 * initialized to the "pseudo default-tile".  In either case,
-	 * pGC->tile.pixmap is set; however, in the "magic special case"
-	 * the mask is not updated to allow us to detect that we should
-	 * initialize the GCTile in the back-end server.  Thus, we catch
-	 * this case in dmxCreateGC and add GCTile to the mask here.
-	 * Are there any cases that I've missed?
-	 */
-
-	/* Make sure that the tile.pixmap is set, just in case the user
-         * set GCTile in the mask but forgot to set vals.pixmap
-	 */
-	if (pGC->tile.pixmap) mask |= GCTile;
-
-	/* This only happens once when the GC is created */
-	pGCPriv->msc = FALSE;
-    }
-
-    /* Update back-end server's gc */
-    if (mask & GCFunction)          v.function = pGC->alu;
-    if (mask & GCPlaneMask)         v.plane_mask = pGC->planemask;
-    if (mask & GCForeground)        v.foreground = pGC->fgPixel;
-    if (mask & GCBackground)        v.background = pGC->bgPixel;
-    if (mask & GCLineWidth)         v.line_width = pGC->lineWidth;
-    if (mask & GCLineStyle)         v.line_style = pGC->lineStyle;
-    if (mask & GCCapStyle)          v.cap_style = pGC->capStyle;
-    if (mask & GCJoinStyle)         v.join_style = pGC->joinStyle;
-    if (mask & GCFillStyle)         v.fill_style = pGC->fillStyle;
-    if (mask & GCFillRule)          v.fill_rule = pGC->fillRule;
-    if (mask & GCTile) {
-	if (pGC->tileIsPixel) {
-	    mask &= ~GCTile;
-	} else {
-	    dmxPixPrivPtr  pPixPriv = DMX_GET_PIXMAP_PRIV(pGC->tile.pixmap);
-	    v.tile = (Drawable)pPixPriv->pixmap;
-	}
-    }
-    if (mask & GCStipple) {
-	dmxPixPrivPtr  pPixPriv = DMX_GET_PIXMAP_PRIV(pGC->stipple);
-	v.stipple = (Drawable)pPixPriv->pixmap;
-    }
-    if (mask & GCTileStipXOrigin)   v.ts_x_origin = pGC->patOrg.x; 
-    if (mask & GCTileStipYOrigin)   v.ts_y_origin = pGC->patOrg.y;
-    if (mask & GCFont) {
-	if (dmxScreen->beDisplay) {
-	    dmxFontPrivPtr  pFontPriv;
-	    pFontPriv = FontGetPrivate(pGC->font, dmxFontPrivateIndex);
-	    v.font = pFontPriv->font[pScreen->myNum]->fid;
-	} else {
-	    mask &= ~GCFont;
-	}
-    }
-    if (mask & GCSubwindowMode)     v.subwindow_mode = pGC->subWindowMode;
-
-    /* Graphics exposures are not needed on the back-ends since they can
-       be generated on the front-end thereby saving bandwidth. */
-    if (mask & GCGraphicsExposures) mask &= ~GCGraphicsExposures;
-
-    if (mask & GCClipXOrigin)       v.clip_x_origin = pGC->clipOrg.x;
-    if (mask & GCClipYOrigin)       v.clip_y_origin = pGC->clipOrg.y;
-    if (mask & GCClipMask)          mask &= ~GCClipMask; /* See ChangeClip */
-    if (mask & GCDashOffset)        v.dash_offset = pGC->dashOffset;
-    if (mask & GCDashList) {
-	mask &= ~GCDashList;
-	if (dmxScreen->beDisplay)
-	    XSetDashes(dmxScreen->beDisplay, pGCPriv->gc,
-		       pGC->dashOffset, (char *)pGC->dash,
-		       pGC->numInDashList);
-    }
-    if (mask & GCArcMode)           v.arc_mode = pGC->arcMode;
-
-    if (mask && dmxScreen->beDisplay) {
-	XChangeGC(dmxScreen->beDisplay, pGCPriv->gc, mask, &v);
-	dmxSync(dmxScreen, FALSE);
-    }
-
-    DMX_GC_FUNC_EPILOGUE(pGC);
-}
-
-/** Copy \a pGCSrc to \a pGCDst on the back-end server associated with
- *  \a pGCSrc's screen. */
-void dmxCopyGC(GCPtr pGCSrc, unsigned long changes, GCPtr pGCDst)
-{
-    ScreenPtr      pScreen = pGCSrc->pScreen;
-    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];
-    dmxGCPrivPtr   pGCSrcPriv = DMX_GET_GC_PRIV(pGCSrc);
-    dmxGCPrivPtr   pGCDstPriv = DMX_GET_GC_PRIV(pGCDst);
-
-    DMX_GC_FUNC_PROLOGUE(pGCDst);
-    pGCDst->funcs->CopyGC(pGCSrc, changes, pGCDst);
-
-    /* Copy the GC on the back-end server */
-    if (dmxScreen->beDisplay)
-	XCopyGC(dmxScreen->beDisplay, pGCSrcPriv->gc, changes, pGCDstPriv->gc);
-
-    DMX_GC_FUNC_EPILOGUE(pGCDst);
-}
-
-/** Free the \a pGC on the back-end server. */
-Bool dmxBEFreeGC(GCPtr pGC)
-{
-    ScreenPtr      pScreen   = pGC->pScreen;
-    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];
-    dmxGCPrivPtr   pGCPriv   = DMX_GET_GC_PRIV(pGC);
-
-    if (pGCPriv->gc) {
-	XFreeGC(dmxScreen->beDisplay, pGCPriv->gc);
-	pGCPriv->gc = NULL;
-	return TRUE;
-    }
-
-    return FALSE;
-}
-
-/** Destroy the graphics context, \a pGC and free the corresponding GC
- *  on the back-end server. */
-void dmxDestroyGC(GCPtr pGC)
-{
-    ScreenPtr      pScreen   = pGC->pScreen;
-    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];
-
-    DMX_GC_FUNC_PROLOGUE(pGC);
-
-    /* Free the GC on the back-end server */
-    if (dmxScreen->beDisplay)
-	dmxBEFreeGC(pGC);
-
-    pGC->funcs->DestroyGC(pGC);
-    DMX_GC_FUNC_EPILOGUE(pGC);
-}
-
-/** Change the clip rects for a GC. */
-void dmxChangeClip(GCPtr pGC, int type, pointer pvalue, int nrects)
-{
-    ScreenPtr      pScreen = pGC->pScreen;
-    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];
-    dmxGCPrivPtr   pGCPriv = DMX_GET_GC_PRIV(pGC);
-    XRectangle    *pRects;
-    BoxPtr         pBox;
-    int            i, nRects;
-
-    DMX_GC_FUNC_PROLOGUE(pGC);
-    pGC->funcs->ChangeClip(pGC, type, pvalue, nrects);
-
-    /* Set the client clip on the back-end server */
-    switch (pGC->clientClipType) {
-    case CT_NONE:
-	if (dmxScreen->beDisplay)
-	    XSetClipMask(dmxScreen->beDisplay, pGCPriv->gc, None);
-	break;
-
-    case CT_REGION:
-	if (dmxScreen->beDisplay) {
-	    nRects = RegionNumRects((RegionPtr)pGC->clientClip);
-	    pRects = malloc(nRects * sizeof(*pRects));
-	    pBox   = RegionRects((RegionPtr)pGC->clientClip);
-
-	    for (i = 0; i < nRects; i++) {
-		pRects[i].x      = pBox[i].x1;
-		pRects[i].y      = pBox[i].y1;
-		pRects[i].width  = pBox[i].x2 - pBox[i].x1;
-		pRects[i].height = pBox[i].y2 - pBox[i].y1;
-	    }
-
-	    XSetClipRectangles(dmxScreen->beDisplay, pGCPriv->gc,
-			       pGC->clipOrg.x, pGC->clipOrg.y,
-			       pRects, nRects, Unsorted);
-
-	    free(pRects);
-	}
-	break;
-
-    case CT_PIXMAP:
-    case CT_UNSORTED:
-    case CT_YSORTED:
-    case CT_YXSORTED:
-    case CT_YXBANDED:
-	/* These clip types are condensed down to either NONE or REGION
-           in the mi code */
-	break;
-    }
-
-    DMX_GC_FUNC_EPILOGUE(pGC);
-}
-
-/** Destroy a GC's clip rects. */
-void dmxDestroyClip(GCPtr pGC)
-{
-    ScreenPtr      pScreen = pGC->pScreen;
-    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];
-    dmxGCPrivPtr   pGCPriv = DMX_GET_GC_PRIV(pGC);
-
-    DMX_GC_FUNC_PROLOGUE(pGC);
-    pGC->funcs->DestroyClip(pGC);
-
-    /* Set the client clip on the back-end server to None */
-    if (dmxScreen->beDisplay)
-	XSetClipMask(dmxScreen->beDisplay, pGCPriv->gc, None);
-
-    DMX_GC_FUNC_EPILOGUE(pGC);
-}
-
-/** Copy a GC's clip rects. */
-void dmxCopyClip(GCPtr pGCDst, GCPtr pGCSrc)
-{
-    DMX_GC_FUNC_PROLOGUE(pGCDst);
-    pGCDst->funcs->CopyClip(pGCDst, pGCSrc);
-    DMX_GC_FUNC_EPILOGUE(pGCDst);
-}
+/*
+ * Copyright 2001-2004 Red Hat Inc., Durham, North Carolina.
+ *
+ * All Rights Reserved.
+ *
+ * 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 on the rights to use, copy, modify, merge,
+ * publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) 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
+ * NON-INFRINGEMENT.  IN NO EVENT SHALL RED HAT AND/OR THEIR SUPPLIERS
+ * 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.
+ */
+
+/*
+ * Authors:
+ *   Kevin E. Martin <kem@redhat.com>
+ *
+ */
+
+/** \file
+ * This file provides support for GCs. */
+
+#ifdef HAVE_DMX_CONFIG_H
+#include <dmx-config.h>
+#endif
+
+#include "dmx.h"
+#include "dmxsync.h"
+#include "dmxgc.h"
+#include "dmxgcops.h"
+#include "dmxpixmap.h"
+#include "dmxfont.h"
+
+#include "gcstruct.h"
+#include "pixmapstr.h"
+#include "migc.h"
+
+static GCFuncs dmxGCFuncs = {
+    dmxValidateGC,
+    dmxChangeGC,
+    dmxCopyGC,
+    dmxDestroyGC,
+    dmxChangeClip,
+    dmxDestroyClip,
+    dmxCopyClip,
+};
+
+static GCOps dmxGCOps = {
+    dmxFillSpans,
+    dmxSetSpans,
+    dmxPutImage,
+    dmxCopyArea,
+    dmxCopyPlane,
+    dmxPolyPoint,
+    dmxPolylines,
+    dmxPolySegment,
+    dmxPolyRectangle,
+    dmxPolyArc,
+    dmxFillPolygon,
+    dmxPolyFillRect,
+    dmxPolyFillArc,
+    dmxPolyText8,
+    dmxPolyText16,
+    dmxImageText8,
+    dmxImageText16,
+    dmxImageGlyphBlt,
+    dmxPolyGlyphBlt,
+    dmxPushPixels
+};
+
+/** Initialize the GC on \a pScreen */
+Bool dmxInitGC(ScreenPtr pScreen)
+{
+    if (!dixRegisterPrivateKey(&dmxGCPrivateKeyRec, PRIVATE_GC, sizeof(dmxGCPrivRec)))
+            return FALSE;
+    return TRUE;
+}
+
+/** Create the GC on the back-end server. */
+void dmxBECreateGC(ScreenPtr pScreen, GCPtr pGC)
+{
+    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];
+    dmxGCPrivPtr   pGCPriv = DMX_GET_GC_PRIV(pGC);
+    int            i;
+
+    for (i = 0; i < dmxScreen->beNumPixmapFormats; i++) {
+	if (pGC->depth == dmxScreen->bePixmapFormats[i].depth) {
+	    unsigned long  mask;
+	    XGCValues      gcvals;
+
+	    mask = GCGraphicsExposures;
+	    gcvals.graphics_exposures = FALSE;
+
+	    /* Create GC in the back-end servers */
+	    pGCPriv->gc = XCreateGC(dmxScreen->beDisplay,
+				    dmxScreen->scrnDefDrawables[i],
+				    mask, &gcvals);
+	    break;
+	}
+    }
+}
+
+/** Create a graphics context on the back-end server associated /a pGC's
+ *  screen. */
+Bool dmxCreateGC(GCPtr pGC)
+{
+    ScreenPtr      pScreen = pGC->pScreen;
+    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];
+    dmxGCPrivPtr   pGCPriv = DMX_GET_GC_PRIV(pGC);
+    Bool           ret;
+
+    DMX_UNWRAP(CreateGC, dmxScreen, pScreen);
+    if ((ret = pScreen->CreateGC(pGC))) {
+	/* Save the old funcs */
+	pGCPriv->funcs = pGC->funcs;
+	pGCPriv->ops   = NULL;
+
+	pGC->funcs = &dmxGCFuncs;
+
+	if (dmxScreen->beDisplay) {
+	    dmxBECreateGC(pScreen, pGC);
+	} else {
+	    pGCPriv->gc = NULL;
+	}
+
+	/* Check for "magic special case"
+	 * 1. see CreateGC in dix/gc.c for more info
+	 * 2. see dmxChangeGC for more info
+	 */
+	pGCPriv->msc = (!pGC->tileIsPixel && !pGC->tile.pixmap);
+    }
+    DMX_WRAP(CreateGC, dmxCreateGC, dmxScreen, pScreen);
+
+    return ret;
+}
+
+/** Validate a graphics context, \a pGC, locally in the DMX server and
+ *  recompute the composite clip, if necessary. */
+void dmxValidateGC(GCPtr pGC, unsigned long changes, DrawablePtr pDrawable)
+{
+    dmxGCPrivPtr pGCPriv = DMX_GET_GC_PRIV(pGC);
+
+    DMX_GC_FUNC_PROLOGUE(pGC);
+#if 0
+    pGC->funcs->ValidateGC(pGC, changes, pDrawable);
+#endif
+
+    if (pDrawable->type == DRAWABLE_WINDOW ||
+	pDrawable->type == DRAWABLE_PIXMAP) {
+	/* Save the old ops, since we're about to change the ops in the
+	 * epilogue.
+	 */
+	pGCPriv->ops = pGC->ops;
+    } else {
+	pGCPriv->ops = NULL;
+    }
+
+    /* If the client clip is different or moved OR the subwindowMode has
+     * changed OR the window's clip has changed since the last
+     * validation, then we need to recompute the composite clip.
+     */
+    if ((changes & (GCClipXOrigin |
+		    GCClipYOrigin |
+		    GCClipMask |
+		    GCSubwindowMode)) ||
+	(pDrawable->serialNumber !=
+	 (pGC->serialNumber & DRAWABLE_SERIAL_BITS))) {
+	miComputeCompositeClip(pGC, pDrawable);
+    }
+
+    DMX_GC_FUNC_EPILOGUE(pGC);
+}
+
+/** Set the values in the graphics context on the back-end server
+ *  associated with \a pGC's screen. */
+void dmxChangeGC(GCPtr pGC, unsigned long mask)
+{
+    ScreenPtr      pScreen = pGC->pScreen;
+    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];
+    dmxGCPrivPtr   pGCPriv = DMX_GET_GC_PRIV(pGC);
+    XGCValues      v;
+
+    DMX_GC_FUNC_PROLOGUE(pGC);
+#if 0
+    pGC->funcs->ChangeGC(pGC, mask);
+#endif
+
+    /* Handle "magic special case" from CreateGC */
+    if (pGCPriv->msc) {
+	/* The "magic special case" is used to handle the case where a
+	 * foreground pixel is set when the GC is created so that a
+	 * "pseudo default-tile" can be created and used in case the
+	 * fillstyle was set to FillTiled.  This specific case is tested
+	 * in xtest (XCreateGC test #3).  What has happened in dix by
+	 * the time it reaches here is (1) the pGC->tile.pixel has been
+	 * set to pGC->fgPixel and pGC->tileIsPixel is set, (2) if a
+	 * tile has also been set, then pGC->tileIsPixel is unset and
+	 * pGC->tile.pixmap is initialized; else, the default tile is
+	 * created and pGC->tileIsPixel is unset and pGC->tile.pixmap is
+	 * initialized to the "pseudo default-tile".  In either case,
+	 * pGC->tile.pixmap is set; however, in the "magic special case"
+	 * the mask is not updated to allow us to detect that we should
+	 * initialize the GCTile in the back-end server.  Thus, we catch
+	 * this case in dmxCreateGC and add GCTile to the mask here.
+	 * Are there any cases that I've missed?
+	 */
+
+	/* Make sure that the tile.pixmap is set, just in case the user
+         * set GCTile in the mask but forgot to set vals.pixmap
+	 */
+	if (pGC->tile.pixmap) mask |= GCTile;
+
+	/* This only happens once when the GC is created */
+	pGCPriv->msc = FALSE;
+    }
+
+    /* Update back-end server's gc */
+    if (mask & GCFunction)          v.function = pGC->alu;
+    if (mask & GCPlaneMask)         v.plane_mask = pGC->planemask;
+    if (mask & GCForeground)        v.foreground = pGC->fgPixel;
+    if (mask & GCBackground)        v.background = pGC->bgPixel;
+    if (mask & GCLineWidth)         v.line_width = pGC->lineWidth;
+    if (mask & GCLineStyle)         v.line_style = pGC->lineStyle;
+    if (mask & GCCapStyle)          v.cap_style = pGC->capStyle;
+    if (mask & GCJoinStyle)         v.join_style = pGC->joinStyle;
+    if (mask & GCFillStyle)         v.fill_style = pGC->fillStyle;
+    if (mask & GCFillRule)          v.fill_rule = pGC->fillRule;
+    if (mask & GCTile) {
+	if (pGC->tileIsPixel) {
+	    mask &= ~GCTile;
+	} else {
+	    dmxPixPrivPtr  pPixPriv = DMX_GET_PIXMAP_PRIV(pGC->tile.pixmap);
+	    v.tile = (Drawable)pPixPriv->pixmap;
+	}
+    }
+    if (mask & GCStipple) {
+	dmxPixPrivPtr  pPixPriv = DMX_GET_PIXMAP_PRIV(pGC->stipple);
+	v.stipple = (Drawable)pPixPriv->pixmap;
+    }
+    if (mask & GCTileStipXOrigin)   v.ts_x_origin = pGC->patOrg.x; 
+    if (mask & GCTileStipYOrigin)   v.ts_y_origin = pGC->patOrg.y;
+    if (mask & GCFont) {
+	if (dmxScreen->beDisplay) {
+	    dmxFontPrivPtr  pFontPriv;
+	    pFontPriv = FontGetPrivate(pGC->font, dmxFontPrivateIndex);
+	    v.font = pFontPriv->font[pScreen->myNum]->fid;
+	} else {
+	    mask &= ~GCFont;
+	}
+    }
+    if (mask & GCSubwindowMode)     v.subwindow_mode = pGC->subWindowMode;
+
+    /* Graphics exposures are not needed on the back-ends since they can
+       be generated on the front-end thereby saving bandwidth. */
+    if (mask & GCGraphicsExposures) mask &= ~GCGraphicsExposures;
+
+    if (mask & GCClipXOrigin)       v.clip_x_origin = pGC->clipOrg.x;
+    if (mask & GCClipYOrigin)       v.clip_y_origin = pGC->clipOrg.y;
+    if (mask & GCClipMask)          mask &= ~GCClipMask; /* See ChangeClip */
+    if (mask & GCDashOffset)        v.dash_offset = pGC->dashOffset;
+    if (mask & GCDashList) {
+	mask &= ~GCDashList;
+	if (dmxScreen->beDisplay)
+	    XSetDashes(dmxScreen->beDisplay, pGCPriv->gc,
+		       pGC->dashOffset, (char *)pGC->dash,
+		       pGC->numInDashList);
+    }
+    if (mask & GCArcMode)           v.arc_mode = pGC->arcMode;
+
+    if (mask && dmxScreen->beDisplay) {
+	XChangeGC(dmxScreen->beDisplay, pGCPriv->gc, mask, &v);
+	dmxSync(dmxScreen, FALSE);
+    }
+
+    DMX_GC_FUNC_EPILOGUE(pGC);
+}
+
+/** Copy \a pGCSrc to \a pGCDst on the back-end server associated with
+ *  \a pGCSrc's screen. */
+void dmxCopyGC(GCPtr pGCSrc, unsigned long changes, GCPtr pGCDst)
+{
+    ScreenPtr      pScreen = pGCSrc->pScreen;
+    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];
+    dmxGCPrivPtr   pGCSrcPriv = DMX_GET_GC_PRIV(pGCSrc);
+    dmxGCPrivPtr   pGCDstPriv = DMX_GET_GC_PRIV(pGCDst);
+
+    DMX_GC_FUNC_PROLOGUE(pGCDst);
+    pGCDst->funcs->CopyGC(pGCSrc, changes, pGCDst);
+
+    /* Copy the GC on the back-end server */
+    if (dmxScreen->beDisplay)
+	XCopyGC(dmxScreen->beDisplay, pGCSrcPriv->gc, changes, pGCDstPriv->gc);
+
+    DMX_GC_FUNC_EPILOGUE(pGCDst);
+}
+
+/** Free the \a pGC on the back-end server. */
+Bool dmxBEFreeGC(GCPtr pGC)
+{
+    ScreenPtr      pScreen   = pGC->pScreen;
+    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];
+    dmxGCPrivPtr   pGCPriv   = DMX_GET_GC_PRIV(pGC);
+
+    if (pGCPriv->gc) {
+	XFreeGC(dmxScreen->beDisplay, pGCPriv->gc);
+	pGCPriv->gc = NULL;
+	return TRUE;
+    }
+
+    return FALSE;
+}
+
+/** Destroy the graphics context, \a pGC and free the corresponding GC
+ *  on the back-end server. */
+void dmxDestroyGC(GCPtr pGC)
+{
+    ScreenPtr      pScreen   = pGC->pScreen;
+    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];
+
+    DMX_GC_FUNC_PROLOGUE(pGC);
+
+    /* Free the GC on the back-end server */
+    if (dmxScreen->beDisplay)
+	dmxBEFreeGC(pGC);
+
+    pGC->funcs->DestroyGC(pGC);
+    DMX_GC_FUNC_EPILOGUE(pGC);
+}
+
+/** Change the clip rects for a GC. */
+void dmxChangeClip(GCPtr pGC, int type, pointer pvalue, int nrects)
+{
+    ScreenPtr      pScreen = pGC->pScreen;
+    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];
+    dmxGCPrivPtr   pGCPriv = DMX_GET_GC_PRIV(pGC);
+    XRectangle    *pRects;
+    BoxPtr         pBox;
+    int            i, nRects;
+
+    DMX_GC_FUNC_PROLOGUE(pGC);
+    pGC->funcs->ChangeClip(pGC, type, pvalue, nrects);
+
+    /* Set the client clip on the back-end server */
+    switch (pGC->clientClipType) {
+    case CT_NONE:
+	if (dmxScreen->beDisplay)
+	    XSetClipMask(dmxScreen->beDisplay, pGCPriv->gc, None);
+	break;
+
+    case CT_REGION:
+	if (dmxScreen->beDisplay) {
+	    nRects = RegionNumRects((RegionPtr)pGC->clientClip);
+	    pRects = malloc(nRects * sizeof(*pRects));
+	    pBox   = RegionRects((RegionPtr)pGC->clientClip);
+
+	    for (i = 0; i < nRects; i++) {
+		pRects[i].x      = pBox[i].x1;
+		pRects[i].y      = pBox[i].y1;
+		pRects[i].width  = pBox[i].x2 - pBox[i].x1;
+		pRects[i].height = pBox[i].y2 - pBox[i].y1;
+	    }
+
+	    XSetClipRectangles(dmxScreen->beDisplay, pGCPriv->gc,
+			       pGC->clipOrg.x, pGC->clipOrg.y,
+			       pRects, nRects, Unsorted);
+
+	    free(pRects);
+	}
+	break;
+
+    case CT_PIXMAP:
+	/* Condensed down to REGION in the mi code */
+	break;
+    }
+
+    DMX_GC_FUNC_EPILOGUE(pGC);
+}
+
+/** Destroy a GC's clip rects. */
+void dmxDestroyClip(GCPtr pGC)
+{
+    ScreenPtr      pScreen = pGC->pScreen;
+    DMXScreenInfo *dmxScreen = &dmxScreens[pScreen->myNum];
+    dmxGCPrivPtr   pGCPriv = DMX_GET_GC_PRIV(pGC);
+
+    DMX_GC_FUNC_PROLOGUE(pGC);
+    pGC->funcs->DestroyClip(pGC);
+
+    /* Set the client clip on the back-end server to None */
+    if (dmxScreen->beDisplay)
+	XSetClipMask(dmxScreen->beDisplay, pGCPriv->gc, None);
+
+    DMX_GC_FUNC_EPILOGUE(pGC);
+}
+
+/** Copy a GC's clip rects. */
+void dmxCopyClip(GCPtr pGCDst, GCPtr pGCSrc)
+{
+    DMX_GC_FUNC_PROLOGUE(pGCDst);
+    pGCDst->funcs->CopyClip(pGCDst, pGCSrc);
+    DMX_GC_FUNC_EPILOGUE(pGCDst);
+}