fc3e8bfb82
Copy the EventRec's information into local variables before processing them, this should make it safer for upcoming threading and also makes it easier to read. Simplify the event allocation code from the abyss it was before. This also fixes a potential bug where a custom handler could scramble the event before the same -now scrambled- event was then passed through the master's custom event handler. Signed-off-by: Peter Hutterer <peter.hutterer@redhat.com>
395 lines
12 KiB
C
395 lines
12 KiB
C
/*
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*
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Copyright 1990, 1998 The Open Group
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Permission to use, copy, modify, distribute, and sell this software and its
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documentation for any purpose is hereby granted without fee, provided that
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the above copyright notice appear in all copies and that both that
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copyright notice and this permission notice appear in supporting
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documentation.
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of The Open Group shall not be
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used in advertising or otherwise to promote the sale, use or other dealings
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in this Software without prior written authorization from The Open Group.
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*
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* Author: Keith Packard, MIT X Consortium
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*/
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/*
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* mieq.c
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*
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* Machine independent event queue
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*
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*/
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#if HAVE_DIX_CONFIG_H
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#include <dix-config.h>
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#endif
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# define NEED_EVENTS
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# include <X11/X.h>
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# include <X11/Xmd.h>
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# include <X11/Xproto.h>
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# include "misc.h"
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# include "windowstr.h"
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# include "pixmapstr.h"
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# include "inputstr.h"
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# include "mi.h"
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# include "mipointer.h"
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# include "scrnintstr.h"
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# include <X11/extensions/XI.h>
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# include <X11/extensions/XIproto.h>
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# include <X11/extensions/geproto.h>
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# include "extinit.h"
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# include "exglobals.h"
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#ifdef DPMSExtension
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# include "dpmsproc.h"
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# define DPMS_SERVER
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# include <X11/extensions/dpms.h>
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#endif
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#define QUEUE_SIZE 512
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#define EnqueueScreen(dev) dev->spriteInfo->sprite->pEnqueueScreen
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#define DequeueScreen(dev) dev->spriteInfo->sprite->pDequeueScreen
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typedef struct _Event {
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EventListPtr events;
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int nevents;
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ScreenPtr pScreen;
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DeviceIntPtr pDev; /* device this event _originated_ from */
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} EventRec, *EventPtr;
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typedef struct _EventQueue {
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HWEventQueueType head, tail; /* long for SetInputCheck */
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CARD32 lastEventTime; /* to avoid time running backwards */
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int lastMotion; /* device ID if last event motion? */
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EventRec events[QUEUE_SIZE]; /* static allocation for signals */
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mieqHandler handlers[128]; /* custom event handler */
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} EventQueueRec, *EventQueuePtr;
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static EventQueueRec miEventQueue;
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Bool
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mieqInit(void)
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{
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int i;
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miEventQueue.head = miEventQueue.tail = 0;
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miEventQueue.lastEventTime = GetTimeInMillis ();
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miEventQueue.lastMotion = FALSE;
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for (i = 0; i < 128; i++)
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miEventQueue.handlers[i] = NULL;
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for (i = 0; i < QUEUE_SIZE; i++)
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{
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EventListPtr evlist = InitEventList(7); /* 1 + MAX_VALUATOR_EVENTS */
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if (!evlist)
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FatalError("Could not allocate event queue.\n");
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miEventQueue.events[i].events = evlist;
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}
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SetInputCheck(&miEventQueue.head, &miEventQueue.tail);
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return TRUE;
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}
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/* Ensure all events in the EQ are at least size bytes. */
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void
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mieqResizeEvents(int min_size)
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{
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int i;
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for (i = 0; i < QUEUE_SIZE; i++)
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SetMinimumEventSize(miEventQueue.events[i].events, 7, min_size);
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}
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/*
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* Must be reentrant with ProcessInputEvents. Assumption: mieqEnqueue
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* will never be interrupted. If this is called from both signal
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* handlers and regular code, make sure the signal is suspended when
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* called from regular code.
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*/
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void
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mieqEnqueue(DeviceIntPtr pDev, xEvent *e)
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{
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unsigned int oldtail = miEventQueue.tail, newtail;
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EventListPtr evt;
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int isMotion = 0;
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int evlen;
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/* avoid merging events from different devices */
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if (e->u.u.type == MotionNotify)
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isMotion = pDev->id;
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else if (e->u.u.type == DeviceMotionNotify)
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isMotion = pDev->id | (1 << 8); /* flag to indicate DeviceMotion */
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/* We silently steal valuator events: just tack them on to the last
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* motion event they need to be attached to. Sigh. */
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if (e->u.u.type == DeviceValuator) {
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deviceValuator *v = (deviceValuator *) e;
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EventPtr laste;
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deviceKeyButtonPointer *lastkbp;
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laste = &miEventQueue.events[(oldtail - 1) % QUEUE_SIZE];
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lastkbp = (deviceKeyButtonPointer *) laste->events->event;
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if (laste->nevents > 6) {
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ErrorF("[mi] mieqEnqueue: more than six valuator events; dropping.\n");
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return;
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}
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if (oldtail == miEventQueue.head ||
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!(lastkbp->type == DeviceMotionNotify ||
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lastkbp->type == DeviceButtonPress ||
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lastkbp->type == DeviceButtonRelease ||
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lastkbp->type == ProximityIn ||
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lastkbp->type == ProximityOut) ||
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((lastkbp->deviceid & DEVICE_BITS) !=
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(v->deviceid & DEVICE_BITS))) {
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ErrorF("[mi] mieqEnequeue: out-of-order valuator event; dropping.\n");
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return;
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}
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memcpy((laste->events[laste->nevents++].event), e, sizeof(xEvent));
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return;
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}
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if (isMotion && isMotion == miEventQueue.lastMotion &&
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oldtail != miEventQueue.head) {
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oldtail = (oldtail - 1) % QUEUE_SIZE;
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}
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else {
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static int stuck = 0;
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newtail = (oldtail + 1) % QUEUE_SIZE;
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/* Toss events which come in late. Usually this means your server's
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* stuck in an infinite loop somewhere, but SIGIO is still getting
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* handled. */
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if (newtail == miEventQueue.head) {
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ErrorF("[mi] EQ overflowing. The server is probably stuck "
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"in an infinite loop.\n");
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if (!stuck) {
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xorg_backtrace();
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stuck = 1;
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}
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return;
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}
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stuck = 0;
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miEventQueue.tail = newtail;
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}
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evlen = sizeof(xEvent);
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if (e->u.u.type == GenericEvent)
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evlen += ((xGenericEvent*)e)->length * 4;
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evt = miEventQueue.events[oldtail].events;
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if (evt->evlen < evlen)
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{
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evt->evlen = evlen;
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evt->event = xrealloc(evt->event, evt->evlen);
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if (!evt->event)
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{
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ErrorF("[mi] Running out of memory. Tossing event.\n");
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return;
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}
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}
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memcpy(evt->event, e, evlen);
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miEventQueue.events[oldtail].nevents = 1;
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/* Make sure that event times don't go backwards - this
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* is "unnecessary", but very useful. */
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if (e->u.u.type != GenericEvent &&
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e->u.keyButtonPointer.time < miEventQueue.lastEventTime &&
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miEventQueue.lastEventTime - e->u.keyButtonPointer.time < 10000)
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evt->event->u.keyButtonPointer.time = miEventQueue.lastEventTime;
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miEventQueue.lastEventTime = evt->event->u.keyButtonPointer.time;
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miEventQueue.events[oldtail].pScreen = EnqueueScreen(pDev);
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miEventQueue.events[oldtail].pDev = pDev;
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miEventQueue.lastMotion = isMotion;
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}
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void
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mieqSwitchScreen(DeviceIntPtr pDev, ScreenPtr pScreen, Bool fromDIX)
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{
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EnqueueScreen(pDev) = pScreen;
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if (fromDIX)
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DequeueScreen(pDev) = pScreen;
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}
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void
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mieqSetHandler(int event, mieqHandler handler)
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{
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if (handler && miEventQueue.handlers[event])
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ErrorF("[mi] mieq: warning: overriding existing handler %p with %p for "
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"event %d\n", miEventQueue.handlers[event], handler, event);
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miEventQueue.handlers[event] = handler;
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}
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/**
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* Change the device id of the given event to the given device's id.
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*/
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static void
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ChangeDeviceID(DeviceIntPtr dev, xEvent* event)
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{
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int type = event->u.u.type;
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if (type == DeviceKeyPress || type == DeviceKeyRelease ||
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type == DeviceButtonPress || type == DeviceButtonRelease ||
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type == DeviceMotionNotify || type == ProximityIn ||
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type == ProximityOut)
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((deviceKeyButtonPointer*)event)->deviceid = dev->id;
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else if (type == DeviceValuator)
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((deviceValuator*)event)->deviceid = dev->id;
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else if (type == GenericEvent)
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{
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/* FIXME: need to put something into XGE to make this saner */
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if (GEIsType(event, IReqCode, XI_DeviceClassesChangedNotify))
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{
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// do nothing or drink a beer. your choice.
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} else
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DebugF("[mi] Unknown generic event (%d/%d), cannot change id.\n",
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((xGenericEvent*)event)->extension,
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((xGenericEvent*)event)->evtype);
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} else
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DebugF("[mi] Unknown event type (%d), cannot change id.\n", type);
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}
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/**
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* Copy the given event into master.
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* @param mdev The master device
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* @param original The event as it came from the EQ
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* @param master The event after being copied
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* @param count Number of events in original.
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*/
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void
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CopyGetMasterEvent(DeviceIntPtr mdev, xEvent* original,
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xEvent** master, int count)
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{
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if (count > 1) {
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*master = xcalloc(count, sizeof(xEvent));
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if (!*master)
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FatalError("[mi] No memory left for master event.\n");
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while(count--)
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{
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memcpy(&(*master)[count], &original[count], sizeof(xEvent));
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ChangeDeviceID(mdev, &(*master)[count]);
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}
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} else
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{
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int len = sizeof(xEvent);
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if (original->u.u.type == GenericEvent)
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len += GEV(original)->length * 4;
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*master = xalloc(len);
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if (!*master)
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FatalError("[mi] No memory left for master event.\n");
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memcpy(*master, original, len);
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ChangeDeviceID(mdev, *master);
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}
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}
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/* Call this from ProcessInputEvents(). */
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void
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mieqProcessInputEvents(void)
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{
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mieqHandler handler;
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EventRec *e = NULL;
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int x = 0, y = 0;
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int type, nevents, evlen, i;
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ScreenPtr screen;
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xEvent *event,
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*master_event = NULL;
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DeviceIntPtr dev = NULL,
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master = NULL;
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while (miEventQueue.head != miEventQueue.tail) {
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if (screenIsSaved == SCREEN_SAVER_ON)
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dixSaveScreens (serverClient, SCREEN_SAVER_OFF, ScreenSaverReset);
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#ifdef DPMSExtension
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else if (DPMSPowerLevel != DPMSModeOn)
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SetScreenSaverTimer();
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if (DPMSPowerLevel != DPMSModeOn)
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DPMSSet(serverClient, DPMSModeOn);
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#endif
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e = &miEventQueue.events[miEventQueue.head];
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/* GenericEvents always have nevents == 1 */
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nevents = e->nevents;
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evlen = (nevents > 1) ? sizeof(xEvent) : e->events->evlen;
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event = xcalloc(nevents, evlen);
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if (!event)
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FatalError("[mi] No memory left for event processing.\n");
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for (i = 0; i < nevents; i++)
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memcpy(&event[i], e->events[i].event, evlen);
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dev = e->pDev;
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screen = e->pScreen;
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miEventQueue.head = (miEventQueue.head + 1) % QUEUE_SIZE;
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type = event->u.u.type;
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master = (!dev->isMaster && dev->u.master) ? dev->u.master : NULL;
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/* Custom event handler */
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handler = miEventQueue.handlers[type];
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if (screen != DequeueScreen(dev) && !handler) {
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/* Assumption - screen switching can only occur on motion events. */
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DequeueScreen(dev) = screen;
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x = event->u.keyButtonPointer.rootX;
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y = event->u.keyButtonPointer.rootY;
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NewCurrentScreen (dev, DequeueScreen(dev), x, y);
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}
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else {
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if (master)
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CopyGetMasterEvent(master, event,
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&master_event, nevents);
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else
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master_event = NULL;
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/* If someone's registered a custom event handler, let them
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* steal it. */
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if (handler)
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{
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handler(DequeueScreen(dev)->myNum, event, dev, nevents);
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if (master)
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handler(DequeueScreen(master)->myNum,
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master_event, master, nevents);
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} else
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{
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/* process slave first, then master */
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dev->public.processInputProc(event, dev, nevents);
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if (master)
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master->public.processInputProc(master_event, master,
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nevents);
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}
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xfree(event);
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xfree(master_event);
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}
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/* Update the sprite now. Next event may be from different device. */
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if (type == DeviceMotionNotify && dev->coreEvents)
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miPointerUpdateSprite(dev);
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}
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}
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