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/*
* $XConsortium: mieq.c,v 1.3 94/01/11 20:49:11 rob Exp $
*
Copyright (c) 1990 X Consortium
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Except as contained in this notice, the name of the X Consortium shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from the X Consortium.
*
* Author: Keith Packard, MIT X Consortium
*
* Copyright 1992, 1993 Data General Corporation;
* Copyright 1992, 1993 OMRON Corporation
*
* 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 neither the name OMRON or DATA GENERAL be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission of the party whose name is to be used. Neither
* OMRON or DATA GENERAL make any representation about the suitability of this
* software for any purpose. It is provided "as is" without express or
* implied warranty.
*
* OMRON AND DATA GENERAL EACH DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
* IN NO EVENT SHALL OMRON OR DATA GENERAL 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.
*
*/
/*
* mieq.c
*
* Machine independent event queue
*
*/
# define NEED_EVENTS
# include "X.h"
# include "Xmd.h"
# include "Xproto.h"
# include "misc.h"
# include "windowstr.h"
# include "pixmapstr.h"
# include "inputstr.h"
# include "mi.h"
# include "scrnintstr.h"
#define QUEUE_SIZE 256
typedef struct _Event {
xEvent event;
ScreenPtr pScreen;
} EventRec, *EventPtr;
typedef struct _EventQueue {
long head, tail; /* long for SetInputCheck */
CARD32 lastEventTime; /* to avoid time running backwards */
Bool lastMotion;
EventRec events[QUEUE_SIZE]; /* static allocation for signals */
DevicePtr pKbd, pPtr; /* device pointer, to get funcs */
ScreenPtr pEnqueueScreen; /* screen events are being delivered to */
ScreenPtr pDequeueScreen; /* screen events are being dispatched to */
} EventQueueRec, *EventQueuePtr;
static EventQueueRec miEventQueue;
Bool
mieqInit (pKbd, pPtr)
DevicePtr pKbd, pPtr;
{
miEventQueue.head = miEventQueue.tail = 0;
miEventQueue.lastEventTime = GetTimeInMillis ();
miEventQueue.pKbd = pKbd;
miEventQueue.pPtr = pPtr;
miEventQueue.lastMotion = FALSE;
miEventQueue.pEnqueueScreen = screenInfo.screens[0];
miEventQueue.pDequeueScreen = miEventQueue.pEnqueueScreen;
#ifndef XTHREADS
SetInputCheck (&miEventQueue.head, &miEventQueue.tail);
#endif /* XTHREADS */
return TRUE;
}
/*
* Must be reentrant with ProcessInputEvents. Assumption: mieqEnqueue
* will never be interrupted. If this is called from both signal
* handlers and regular code, make sure the signal is suspended when
* called from regular code.
*/
void
mieqEnqueue (e)
xEvent *e;
{
int oldtail, newtail, prevtail;
Bool isMotion;
oldtail = miEventQueue.tail;
isMotion = e->u.u.type == MotionNotify;
if (isMotion && miEventQueue.lastMotion && oldtail != miEventQueue.head)
{
if (oldtail == 0)
oldtail = QUEUE_SIZE;
oldtail = oldtail - 1;
}
else
{
newtail = oldtail + 1;
if (newtail == QUEUE_SIZE)
newtail = 0;
/* Toss events which come in late */
if (newtail == miEventQueue.head)
return;
miEventQueue.tail = newtail;
}
miEventQueue.lastMotion = isMotion;
miEventQueue.events[oldtail].event = *e;
/*
* Make sure that event times don't go backwards - this
* is "unnecessary", but very useful
*/
if (e->u.keyButtonPointer.time < miEventQueue.lastEventTime &&
miEventQueue.lastEventTime - e->u.keyButtonPointer.time < 10000)
{
miEventQueue.events[oldtail].event.u.keyButtonPointer.time =
miEventQueue.lastEventTime;
}
miEventQueue.events[oldtail].pScreen = miEventQueue.pEnqueueScreen;
}
void
mieqSwitchScreen (pScreen, fromDIX)
ScreenPtr pScreen;
Bool fromDIX;
{
miEventQueue.pEnqueueScreen = pScreen;
if (fromDIX)
miEventQueue.pDequeueScreen = pScreen;
}
/*
* Call this from ProcessInputEvents()
*/
mieqProcessInputEvents ()
{
EventRec *e;
int x, y;
xEvent xe;
while (miEventQueue.head != miEventQueue.tail)
{
extern int screenIsSaved;
if (screenIsSaved == SCREEN_SAVER_ON)
SaveScreens (SCREEN_SAVER_OFF, ScreenSaverReset);
e = &miEventQueue.events[miEventQueue.head];
/*
* Assumption - screen switching can only occur on motion events
*/
if (e->pScreen != miEventQueue.pDequeueScreen)
{
miEventQueue.pDequeueScreen = e->pScreen;
x = e->event.u.keyButtonPointer.rootX;
y = e->event.u.keyButtonPointer.rootY;
if (miEventQueue.head == QUEUE_SIZE - 1)
miEventQueue.head = 0;
else
++miEventQueue.head;
NewCurrentScreen (miEventQueue.pDequeueScreen, x, y);
}
else
{
xe = e->event;
if (miEventQueue.head == QUEUE_SIZE - 1)
miEventQueue.head = 0;
else
++miEventQueue.head;
switch (xe.u.u.type)
{
case KeyPress:
case KeyRelease:
#ifndef XTHREADS
(*miEventQueue.pKbd->processInputProc)
#else /* XTHREADS */
LockDeviceAndProcessInputEvent
#endif /* XTHREADS */
(&xe, miEventQueue.pKbd, 1);
break;
default:
#ifndef XTHREADS
(*miEventQueue.pPtr->processInputProc)
#else /* XTHREADS */
LockDeviceAndProcessInputEvent
#endif /* XTHREADS */
(&xe, miEventQueue.pPtr, 1);
break;
}
}
}
}
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