/* * Copyright 1990, 1998 The Open Group 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. 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 */ /* * mieq.c * * Machine independent event queue * */ #if HAVE_DIX_CONFIG_H #include #endif # define NEED_EVENTS # include # include # include # include "misc.h" # include "windowstr.h" # include "pixmapstr.h" # include "inputstr.h" # include "mi.h" # include "mipointer.h" # include "scrnintstr.h" # include # include # include "extinit.h" # include "exglobals.h" #ifdef DPMSExtension # include "dpmsproc.h" # define DPMS_SERVER # include #endif #define QUEUE_SIZE 256 typedef struct _Event { xEvent event[7]; int nevents; ScreenPtr pScreen; DeviceIntPtr pDev; /* device this event _originated_ from */ } EventRec, *EventPtr; typedef struct _EventQueue { HWEventQueueType head, tail; /* long for SetInputCheck */ CARD32 lastEventTime; /* to avoid time running backwards */ int lastMotion; /* device ID if last event motion? */ EventRec events[QUEUE_SIZE]; /* static allocation for signals */ ScreenPtr pEnqueueScreen; /* screen events are being delivered to */ ScreenPtr pDequeueScreen; /* screen events are being dispatched to */ } EventQueueRec, *EventQueuePtr; static EventQueueRec miEventQueue; Bool mieqInit() { miEventQueue.head = miEventQueue.tail = 0; miEventQueue.lastEventTime = GetTimeInMillis (); 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(DeviceIntPtr pDev, xEvent *e) { HWEventQueueType oldtail = miEventQueue.tail, newtail; int isMotion = 0; deviceValuator *v = (deviceValuator *) e; EventPtr laste = &miEventQueue.events[oldtail - 1]; deviceKeyButtonPointer *lastkbp = (deviceKeyButtonPointer *) &laste->event[0]; if (e->u.u.type == MotionNotify) isMotion = inputInfo.pointer->id; else if (e->u.u.type == DeviceMotionNotify) isMotion = pDev->id; /* We silently steal valuator events: just tack them on to the last * motion event they need to be attached to. Sigh. */ if (e->u.u.type == DeviceValuator) { if (laste->nevents > 6) { ErrorF("mieqEnqueue: more than six valuator events; dropping.\n"); return; } if (oldtail == miEventQueue.head || !(lastkbp->type == DeviceMotionNotify || lastkbp->type == DeviceButtonPress || lastkbp->type == DeviceButtonRelease) || ((lastkbp->deviceid & DEVICE_BITS) != (v->deviceid & DEVICE_BITS))) { ErrorF("mieqEnequeue: out-of-order valuator event; dropping.\n"); return; } memcpy(&(laste->event[laste->nevents++]), e, sizeof(xEvent)); return; } if (isMotion && 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. Usually this means your server's * stuck in an infinite loop somewhere, but SIGIO is still getting * handled. */ if (newtail == miEventQueue.head) { ErrorF("tossed event which came in late\n"); return; } miEventQueue.tail = newtail; } memcpy(&(miEventQueue.events[oldtail].event[0]), e, sizeof(xEvent)); miEventQueue.events[oldtail].nevents = 1; /* 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[0].u.keyButtonPointer.time = miEventQueue.lastEventTime; miEventQueue.lastEventTime = miEventQueue.events[oldtail].event[0].u.keyButtonPointer.time; miEventQueue.events[oldtail].pScreen = miEventQueue.pEnqueueScreen; miEventQueue.events[oldtail].pDev = pDev; miEventQueue.lastMotion = isMotion; } void mieqSwitchScreen(ScreenPtr pScreen, Bool fromDIX) { miEventQueue.pEnqueueScreen = pScreen; if (fromDIX) miEventQueue.pDequeueScreen = pScreen; } /* Call this from ProcessInputEvents(). */ void mieqProcessInputEvents() { EventRec *e = NULL; int x = 0, y = 0; DeviceIntPtr dev = NULL; while (miEventQueue.head != miEventQueue.tail) { if (screenIsSaved == SCREEN_SAVER_ON) SaveScreens (SCREEN_SAVER_OFF, ScreenSaverReset); #ifdef DPMSExtension else if (DPMSPowerLevel != DPMSModeOn) SetScreenSaverTimer(); if (DPMSPowerLevel != DPMSModeOn) DPMSSet(DPMSModeOn); #endif 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[0].u.keyButtonPointer.rootX; y = e->event[0].u.keyButtonPointer.rootY; if (miEventQueue.head == QUEUE_SIZE - 1) miEventQueue.head = 0; else ++miEventQueue.head; NewCurrentScreen (miEventQueue.pDequeueScreen, x, y); } else { if (miEventQueue.head == QUEUE_SIZE - 1) miEventQueue.head = 0; else ++miEventQueue.head; /* If this is a core event, make sure our keymap, et al, is * changed to suit. */ if (e->event[0].u.u.type == KeyPress || e->event[0].u.u.type == KeyRelease) { SwitchCoreKeyboard(e->pDev); dev = inputInfo.keyboard; } else if (e->event[0].u.u.type == MotionNotify || e->event[0].u.u.type == ButtonPress || e->event[0].u.u.type == ButtonRelease) { SwitchCorePointer(e->pDev); dev = inputInfo.pointer; } else { dev = e->pDev; } dev->public.processInputProc(e->event, dev, e->nevents); } } }