lbxdeltastr.h
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上传日期:2022-06-04
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流媒体/Mpeg4/MP4
开发平台:
Visual C++
- /* $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 */