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- /* $Header: XGMotion.c,v 1.10 91/07/23 12:27:22 rws Exp $ */
-
- /************************************************************
- Copyright (c) 1989 by Hewlett-Packard Company, Palo Alto, California, and the
- Massachusetts Institute of Technology, Cambridge, Massachusetts.
-
- All Rights Reserved
-
- Permission to use, copy, modify, and distribute this software and its
- documentation for any purpose and without fee is hereby granted,
- 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 names of Hewlett-Packard or MIT not be
- used in advertising or publicity pertaining to distribution of the
- software without specific, written prior permission.
-
- HEWLETT-PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
- ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
- HEWLETT-PACKARD 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.
-
- ********************************************************/
-
- /***********************************************************************
- *
- * XGetDeviceMotionEvents - Get the motion history of an input device.
- *
- */
-
- #include "XI.h"
- #include "XIproto.h"
- #include "Xlibint.h"
- #include "XInput.h"
- #include "extutil.h"
-
- XDeviceTimeCoord
- *XGetDeviceMotionEvents (dpy, dev, start, stop, nEvents, mode, axis_count)
- register Display *dpy;
- XDevice *dev;
- Time start;
- Time stop;
- int *nEvents;
- int *mode;
- int *axis_count;
- {
- xGetDeviceMotionEventsReq *req;
- xGetDeviceMotionEventsReply rep;
- XDeviceTimeCoord *tc;
- int *data, *bufp, *readp, *savp;
- long size, size2;
- int i, j;
- XExtDisplayInfo *info = (XExtDisplayInfo *) XInput_find_display (dpy);
-
- LockDisplay (dpy);
- if (CheckExtInit(dpy, XInput_Initial_Release) == -1)
- return ((XDeviceTimeCoord *) NoSuchExtension);
-
- GetReq(GetDeviceMotionEvents,req);
- req->reqType = info->codes->major_opcode;
- req->ReqType = X_GetDeviceMotionEvents;
- req->start = start;
- req->stop = stop;
- req->deviceid = dev->device_id;
-
- if (!_XReply (dpy, (xReply *)&rep, 0, xFalse)) {
- UnlockDisplay(dpy);
- SyncHandle();
- *nEvents = 0;
- return (NULL);
- }
-
- *mode = rep.mode;
- *axis_count = rep.axes;
- *nEvents = rep.nEvents;
- size = rep.length << 2;
- size2 = rep.nEvents *
- (sizeof (XDeviceTimeCoord) + (rep.axes * sizeof (int)));
- savp = readp = (int *) Xmalloc (size);
- bufp = (int *) Xmalloc (size2);
- if (!bufp || !savp)
- {
- *nEvents = 0;
- _XEatData (dpy, (unsigned long) size);
- UnlockDisplay(dpy);
- SyncHandle();
- return (NULL);
- }
- _XRead (dpy, (int *) readp, size);
-
- tc = (XDeviceTimeCoord *) bufp;
- data = (int *) (tc + rep.nEvents);
- for (i=0; i<*nEvents; i++,tc++)
- {
- tc->time = *readp++;
- tc->data = data;
- for (j=0; j<*axis_count; j++)
- *data++ = *readp++;
- }
- XFree ((char *)savp);
- UnlockDisplay(dpy);
- SyncHandle();
- return ((XDeviceTimeCoord *) bufp);
- }
-
- XFreeDeviceMotionEvents (events)
- XDeviceTimeCoord *events;
- {
- XFree ((char *)events);
- }
-