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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
+
+extern int LBXInitDeltaCache ( LBXDeltasPtr pcache, int nDeltas,
+ int maxDeltasize );
+extern void LBXFreeDeltaCache ( LBXDeltasPtr pcache );
+extern int LBXDeltaMinDiffs ( LBXDeltasPtr pcache, unsigned char *inmsg,
+ int inmsglen, int maxdiff, int *pindex );
+extern void LBXEncodeDelta ( LBXDeltasPtr pcache, unsigned char *inmsg,
+ int ndiff, int index, unsigned char *buf );
+extern int LBXDecodeDelta ( LBXDeltasPtr pcache, xLbxDiffItem *deltas,
+ int ndiff, int index, unsigned char **buf );
+extern void LBXAddDeltaOut ( LBXDeltasPtr pcache, unsigned char *inmsg,
+ int inmsglen );
+extern void LBXAddDeltaIn ( LBXDeltasPtr pcache, unsigned char *inmsg,
+ int inmsglen );
+
+#endif /* LBX_DELTA_STRUCT_H */