106 lines
3.3 KiB
C
106 lines
3.3 KiB
C
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/* $Xorg: lbxdeltastr.h,v 1.3 2000/08/18 04:05:45 coskrey Exp $ */
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/*
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* Copyright 1993 Network Computing Devices
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that
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* copyright notice and this permission notice appear in supporting
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* documentation, and that the name of NCD. not be used in advertising or
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* publicity pertaining to distribution of the software without specific,
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* written prior permission. NCD. makes no representations about the
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* suitability of this software for any purpose. It is provided "as is"
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* without express or implied warranty.
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*
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* NCD. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL NCD.
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* BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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*/
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#ifndef LBX_DELTA_STRUCT_H
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#define LBX_DELTA_STRUCT_H
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#define MIN_CACHEABLE_LEN 8
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#define DELTA_CACHEABLE(pcache, len) \
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((len) > MIN_CACHEABLE_LEN && (len) <= (pcache)->maxDeltasize)
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/*
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* An entry in the delta compactor cache
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*/
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typedef struct _LBXDeltaElem {
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int length;
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unsigned char *buf;
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} LBXDeltaElemRec, *LBXDeltaElemPtr;
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/*
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* Delta compactor cache
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*/
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typedef struct _LBXDeltas {
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unsigned short nDeltas;
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unsigned short maxDeltasize;
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LBXDeltaElemPtr deltas;
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unsigned short nextDelta;
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unsigned short activeDeltas; /* only needed for outgoing */
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} LBXDeltasRec, *LBXDeltasPtr;
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/*
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* Motion delta cache
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*/
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typedef struct {
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BYTE swapped;
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BYTE detail;
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CARD16 sequenceNumber B16;
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Time time B32;
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Window root B32, event B32, child B32;
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INT16 rootX B16, rootY B16, eventX B16, eventY B16;
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KeyButMask state B16;
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BOOL sameScreen;
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} lbxMotionCache;
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/*
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* Motion delta events
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*/
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typedef struct {
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BYTE type; /* always eventBase + LbxQuickMotionDeltaEvent */
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CARD8 deltaTime;
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INT8 deltaX;
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INT8 deltaY;
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} lbxQuickMotionDeltaEvent;
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#define sz_lbxQuickMotionDeltaEvent 4
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typedef struct {
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BYTE type; /* always eventBase + LbxEvent */
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BYTE lbxType; /* LbxMotionDeltaEvent */
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INT8 deltaX;
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INT8 deltaY;
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CARD16 deltaTime B16;
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CARD16 deltaSequence B16;
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} lbxMotionDeltaEvent;
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#define sz_lbxMotionDeltaEvent 8
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extern int LBXInitDeltaCache ( LBXDeltasPtr pcache, int nDeltas,
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int maxDeltasize );
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extern void LBXFreeDeltaCache ( LBXDeltasPtr pcache );
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extern int LBXDeltaMinDiffs ( LBXDeltasPtr pcache, unsigned char *inmsg,
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int inmsglen, int maxdiff, int *pindex );
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extern void LBXEncodeDelta ( LBXDeltasPtr pcache, unsigned char *inmsg,
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int ndiff, int index, unsigned char *buf );
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extern int LBXDecodeDelta ( LBXDeltasPtr pcache, xLbxDiffItem *deltas,
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int ndiff, int index, unsigned char **buf );
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extern void LBXAddDeltaOut ( LBXDeltasPtr pcache, unsigned char *inmsg,
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int inmsglen );
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extern void LBXAddDeltaIn ( LBXDeltasPtr pcache, unsigned char *inmsg,
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int inmsglen );
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#endif /* LBX_DELTA_STRUCT_H */
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