R6.6 is the Xorg base-lineXORG-MAINXORG-STABLE

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diff --git a/lbxdeltastr.h b/lbxdeltastr.h
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+/* $Xorg: lbxdeltastr.h,v 1.3 2000/08/18 04:05:45 coskrey Exp $ */
+/*
+ * Copyright 1993 Network Computing Devices
+ *
+ * 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, and that the name of NCD. not be used in advertising or
+ * publicity pertaining to distribution of the software without specific,
+ * written prior permission.  NCD. makes no representations about the
+ * suitability of this software for any purpose.  It is provided "as is"
+ * without express or implied warranty.
+ *
+ * NCD. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL NCD.
+ * 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.
+ *
+ */
+
+#ifndef LBX_DELTA_STRUCT_H
+#define LBX_DELTA_STRUCT_H
+
+#define MIN_CACHEABLE_LEN		8
+
+#define DELTA_CACHEABLE(pcache, len)	\
+	((len) > MIN_CACHEABLE_LEN && (len) <= (pcache)->maxDeltasize)
+
+/*
+ * An entry in the delta compactor cache
+ */
+typedef struct _LBXDeltaElem {
+    int			length;
+    unsigned char	*buf;
+} LBXDeltaElemRec, *LBXDeltaElemPtr;
+
+
+/*
+ * Delta compactor cache
+ */
+typedef struct _LBXDeltas {
+    unsigned short	nDeltas;
+    unsigned short	maxDeltasize;
+    LBXDeltaElemPtr	deltas;
+    unsigned short	nextDelta;
+    unsigned short	activeDeltas;	/* only needed for outgoing */
+} LBXDeltasRec, *LBXDeltasPtr;
+
+
+/*
+ * Motion delta cache
+ */
+
+typedef struct {
+    BYTE swapped;
+    BYTE detail;
+    CARD16 sequenceNumber B16;
+    Time time B32;
+    Window root B32, event B32, child B32;
+    INT16 rootX B16, rootY B16, eventX B16, eventY B16;
+    KeyButMask state B16;
+    BOOL sameScreen;		
+} lbxMotionCache;
+
+
+/*
+ * Motion delta events
+ */
+
+typedef struct {
+    BYTE type;		/* always eventBase + LbxQuickMotionDeltaEvent */
+    CARD8 deltaTime;
+    INT8 deltaX;
+    INT8 deltaY;
+} lbxQuickMotionDeltaEvent;
+#define sz_lbxQuickMotionDeltaEvent 4
+
+typedef struct {
+    BYTE type;		/* always eventBase + LbxEvent */
+    BYTE lbxType;	/* LbxMotionDeltaEvent */
+    INT8 deltaX;
+    INT8 deltaY;
+    CARD16 deltaTime B16;
+    CARD16 deltaSequence B16;
+} lbxMotionDeltaEvent;
+#define sz_lbxMotionDeltaEvent 8
+
+#endif /* LBX_DELTA_STRUCT_H */