R6.6 is the Xorg base-lineXORG-MAIN

1 files changed, 191 insertions, 0 deletions

diff --git a/mi/mieq.c b/mi/mieq.c
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+++ b/mi/mieq.c
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+/*
+ * $Xorg: mieq.c,v 1.4 2001/02/09 02:05:20 xorgcvs Exp $
+ *
+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
+ *
+ */
+
+# 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, 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:
+	    	(*miEventQueue.pKbd->processInputProc)
+				(&xe, (DeviceIntPtr)miEventQueue.pKbd, 1);
+	    	break;
+	    default:
+	    	(*miEventQueue.pPtr->processInputProc)
+				(&xe, (DeviceIntPtr)miEventQueue.pPtr, 1);
+	    	break;
+	    }
+	}
+    }
+}