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/*
* $Xorg: mieq.c,v 1.3 2000/08/17 19:53:37 cpqbld Exp $
*
Copyright 1990, 1998 The Open Group
All Rights Reserved.
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
OPEN GROUP 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 Open Group 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 Open Group.
*
* Author: Keith Packard, MIT X Consortium
*/
/* $XFree86: xc/programs/Xserver/mi/mieq.c,v 1.1.1.4.2.1 2001/05/25 18:50:12 dawes Exp $ */
/*
* 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 {
HWEventQueueType 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;
SetInputCheck (&miEventQueue.head, &miEventQueue.tail);
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;
{
HWEventQueueType oldtail, newtail;
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()
*/
void mieqProcessInputEvents ()
{
EventRec *e;
int x, y;
xEvent xe;
while (miEventQueue.head != miEventQueue.tail)
{
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:
(*miEventQueue.pKbd->processInputProc)
(&xe, (DeviceIntPtr)miEventQueue.pKbd, 1);
break;
default:
(*miEventQueue.pPtr->processInputProc)
(&xe, (DeviceIntPtr)miEventQueue.pPtr, 1);
break;
}
}
}
}
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