Xext: add GEDeviceMaskIsSet (GE mask checking per device)

If a mask was set for the NULL device, then we pretend the mask is set for all
devices.

Xext/geext.c

@@ -378,4 +378,38 @@ void GEWindowSetMask(ClientPtr pClient, DeviceIntPtr pDev,
     GERecalculateWinMask(pWin);
 }
 
+/**
+ * Return TRUE if the mask for the given device is set.
+ * @param pWin Window the event may be delivered to.
+ * @param pDev Device the device originating the event. May be NULL.
+ * @param extension Extension ID
+ * @param mask Event mask
+ */
+BOOL GEDeviceMaskIsSet(WindowPtr pWin, DeviceIntPtr pDev,
+                       int extension, Mask mask)
+{
+    GenericMaskPtr gemask;
+
+    if (!pWin->optional || !pWin->optional->geMasks)
+        return FALSE;
+
+    extension &= 0x7F;
+
+    if (!pWin->optional->geMasks->eventMasks[extension] & mask)
+        return FALSE;
+
+
+    gemask = pWin->optional->geMasks->geClients;
+
+    while(gemask)
+    {
+        if ((!gemask->dev || gemask->dev == pDev) && 
+                (gemask->eventMask[extension] & mask))
+            return TRUE;
+
+        gemask = gemask->next;
+    }
+
+    return FALSE;
+}
 

Xext/geext.h

@@ -106,7 +106,8 @@ void GERegisterExtension(
         );
 
 void GEInitEvent(xGenericEvent* ev, int extension);
-
+BOOL GEDeviceMaskIsSet(WindowPtr pWin, DeviceIntPtr pDev, 
+                       int extension, Mask mask);
 
 void GEExtensionInit(void);
 

dix/events.c

@@ -2151,7 +2151,7 @@ DeliverEventsToWindow(DeviceIntPtr pDev, WindowPtr pWin, xEvent
 
             /* if we get here, filter should be set to the GE specific mask.
                check if any client wants it */
-            if (!GEMaskIsSet(pWin, GEEXT(pEvents), filter))
+            if (!GEDeviceMaskIsSet(pWin, pDev, GEEXT(pEvents), filter))
                 return 0;
 
             /* run through all clients, deliver event */
@@ -2471,7 +2471,7 @@ DeliverDeviceEvents(WindowPtr pWin, xEvent *xE, GrabPtr grab,
 
         while(win)
         {
-            if (GEMaskIsSet(win, GEEXT(xE), filter))
+            if (GEDeviceMaskIsSet(win, dev, GEEXT(xE), filter))
             {
                 if (GEExtensions[GEEXTIDX(xE)].evfill)
                     GEExtensions[GEEXTIDX(xE)].evfill(ge, dev, win, grab);