| 1 | /* $Xorg: lbxdeltastr.h,v 1.3 2000/08/18 04:05:45 coskrey Exp $ */
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| 2 | /*
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| 3 | * Copyright 1993 Network Computing Devices
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| 4 | *
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| 5 | * Permission to use, copy, modify, distribute, and sell this software and its
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| 6 | * documentation for any purpose is hereby granted without fee, provided that
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| 7 | * the above copyright notice appear in all copies and that both that
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| 8 | * copyright notice and this permission notice appear in supporting
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| 9 | * documentation, and that the name of NCD. not be used in advertising or
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| 10 | * publicity pertaining to distribution of the software without specific,
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| 11 | * written prior permission. NCD. makes no representations about the
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| 12 | * suitability of this software for any purpose. It is provided "as is"
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| 13 | * without express or implied warranty.
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| 14 | *
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| 15 | * NCD. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
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| 16 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL NCD.
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| 17 | * BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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| 18 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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| 19 | * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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| 20 | * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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| 21 | *
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| 22 | */
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| 23 |
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| 24 | #ifndef LBX_DELTA_STRUCT_H
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| 25 | #define LBX_DELTA_STRUCT_H
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| 26 |
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| 27 | #define MIN_CACHEABLE_LEN 8
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| 28 |
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| 29 | #define DELTA_CACHEABLE(pcache, len) \
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| 30 | ((len) > MIN_CACHEABLE_LEN && (len) <= (pcache)->maxDeltasize)
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| 31 |
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| 32 | /*
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| 33 | * An entry in the delta compactor cache
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| 34 | */
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| 35 | typedef struct _LBXDeltaElem {
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| 36 | int length;
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| 37 | unsigned char *buf;
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| 38 | } LBXDeltaElemRec, *LBXDeltaElemPtr;
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| 39 |
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| 40 |
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| 41 | /*
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| 42 | * Delta compactor cache
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| 43 | */
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| 44 | typedef struct _LBXDeltas {
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| 45 | unsigned short nDeltas;
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| 46 | unsigned short maxDeltasize;
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| 47 | LBXDeltaElemPtr deltas;
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| 48 | unsigned short nextDelta;
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| 49 | unsigned short activeDeltas; /* only needed for outgoing */
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| 50 | } LBXDeltasRec, *LBXDeltasPtr;
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| 51 |
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| 52 |
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| 53 | /*
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| 54 | * Motion delta cache
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| 55 | */
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| 56 |
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| 57 | typedef struct {
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| 58 | BYTE swapped;
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| 59 | BYTE detail;
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| 60 | CARD16 sequenceNumber B16;
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| 61 | Time time B32;
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| 62 | Window root B32, event B32, child B32;
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| 63 | INT16 rootX B16, rootY B16, eventX B16, eventY B16;
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| 64 | KeyButMask state B16;
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| 65 | BOOL sameScreen;
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| 66 | } lbxMotionCache;
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| 67 |
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| 68 |
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| 69 | /*
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| 70 | * Motion delta events
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| 71 | */
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| 72 |
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| 73 | typedef struct {
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| 74 | BYTE type; /* always eventBase + LbxQuickMotionDeltaEvent */
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| 75 | CARD8 deltaTime;
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| 76 | INT8 deltaX;
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| 77 | INT8 deltaY;
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| 78 | } lbxQuickMotionDeltaEvent;
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| 79 | #define sz_lbxQuickMotionDeltaEvent 4
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| 80 |
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| 81 | typedef struct {
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| 82 | BYTE type; /* always eventBase + LbxEvent */
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| 83 | BYTE lbxType; /* LbxMotionDeltaEvent */
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| 84 | INT8 deltaX;
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| 85 | INT8 deltaY;
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| 86 | CARD16 deltaTime B16;
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| 87 | CARD16 deltaSequence B16;
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| 88 | } lbxMotionDeltaEvent;
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| 89 | #define sz_lbxMotionDeltaEvent 8
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| 90 |
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| 91 | extern int LBXInitDeltaCache ( LBXDeltasPtr pcache, int nDeltas,
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| 92 | int maxDeltasize );
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| 93 | extern void LBXFreeDeltaCache ( LBXDeltasPtr pcache );
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| 94 | extern int LBXDeltaMinDiffs ( LBXDeltasPtr pcache, unsigned char *inmsg,
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| 95 | int inmsglen, int maxdiff, int *pindex );
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| 96 | extern void LBXEncodeDelta ( LBXDeltasPtr pcache, unsigned char *inmsg,
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| 97 | int ndiff, int index, unsigned char *buf );
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| 98 | extern int LBXDecodeDelta ( LBXDeltasPtr pcache, xLbxDiffItem *deltas,
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| 99 | int ndiff, int index, unsigned char **buf );
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| 100 | extern void LBXAddDeltaOut ( LBXDeltasPtr pcache, unsigned char *inmsg,
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| 101 | int inmsglen );
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| 102 | extern void LBXAddDeltaIn ( LBXDeltasPtr pcache, unsigned char *inmsg,
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| 103 | int inmsglen );
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| 104 |
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| 105 | #endif /* LBX_DELTA_STRUCT_H */
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