xref: /xsrc/external/mit/libXi/dist/src/XGMotion.c

/************************************************************

Copyright 1989, 1998  The Open Group

Permission to use, copy, modify, distribute, and sell this software and its
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Copyright 1989 by Hewlett-Packard Company, Palo Alto, California.

			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 name of Hewlett-Packard not be
used in advertising or publicity pertaining to distribution of the
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********************************************************/

/***********************************************************************
 *
 * XGetDeviceMotionEvents - Get the motion history of an input device.
 *
 */

#include <X11/extensions/XI.h>
#include <X11/extensions/XIproto.h>
#include <X11/Xlibint.h>
#include <X11/extensions/XInput.h>
#include <X11/extensions/extutil.h>
#include "XIint.h"

XDeviceTimeCoord *
XGetDeviceMotionEvents(
    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 = XInput_find_display(dpy);

    LockDisplay(dpy);
    if (_XiCheckExtInit(dpy, XInput_Initial_Release, info) == -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;
    if (!rep.nEvents) {
	UnlockDisplay(dpy);
	SyncHandle();
	return (NULL);
    }
    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) {
	Xfree(bufp);
	Xfree(savp);
	*nEvents = 0;
	_XEatData(dpy, (unsigned long)size);
	UnlockDisplay(dpy);
	SyncHandle();
	return (NULL);
    }
    _XRead(dpy, (char *)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);
}

void
XFreeDeviceMotionEvents(XDeviceTimeCoord *events)
{
    XFree((char *)events);
}