dix: move focus handling into enterleave.c.

This commit moves the focus handling from events.c into enterleave.c and
implements a model similar to the core enter/leave model.
For a full description of the model, see:
http://lists.freedesktop.org/archives/xorg/2008-December/041740.html

This commit also gets rid of the focusinout array in the WindowRec, ditching
it in favour of a local array that keeps the current focus window for each
device.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

4 files changed, 837 insertions, 274 deletions

diff --git a/dix/enterleave.c b/dix/enterleave.c
index d01597aac..1a5f1b598 100644
--- a/dix/enterleave.c
+++ b/dix/enterleave.c
@@ -30,19 +30,24 @@
 
 #include <X11/X.h>
 #include "windowstr.h"
+#include "scrnintstr.h"
 #include "exglobals.h"
 #include "enterleave.h"
 
-/* @file This file describes the model for sending core enter/leave events in
- * the case of multiple pointers.
- * Since we can't send more than one Enter or Leave event per window
- * to a core client without confusing it, this is a rather complicated
+/* @file This file describes the model for sending core enter/leave events and
+ * focus in/out in the case of multiple pointers/keyboard foci
+ * Since we can't send more than one Enter or Leave/Focus in or out event per
+ * window to a core client without confusing it, this is a rather complicated
  * approach.
  *
  * For a full description of the enter/leave model from a window's
  * perspective, see
  * http://lists.freedesktop.org/archives/xorg/2008-August/037606.html
  *
+ * For a full description of the focus in/out model from a window's
+ * perspective, see
+ * http://lists.freedesktop.org/archives/xorg/2008-December/041740.html
+ *
  * Additional notes:
  * -) The core protocol spec says that "In a LeaveNotify event, if a child of the
  * event window contains the initial position of the pointer, then the child
@@ -52,6 +57,12 @@
  *
  * By inference, this means that only NotifyVirtual or NotifyNonlinearVirtual
  * events may have a subwindow set to other than None.
+ *
+ * -) NotifyPointer events may be sent if the focus changes from window A to
+ * B. The assumption used in this model is that NotifyPointer events are only
+ * sent for the pointer paired with the keyboard that is involved in the focus
+ * events. For example, if F(W) changes because of keyboard 2, then
+ * NotifyPointer events are only sent for pointer 2.
  */
 
 static WindowPtr PointerWindows[MAXDEVICES];
@@ -73,6 +84,10 @@ HasPointer(WindowPtr win)
     return FALSE;
 }
 
+/**
+ * Return TRUE if at least one keyboard focus is set to @win (excluding
+ * descendants of win).
+ */
 static BOOL
 HasFocus(WindowPtr win)
 {
@@ -85,6 +100,15 @@ HasFocus(WindowPtr win)
 }
 
 /**
+ * Return the window the device @dev is currently on.
+ */
+static WindowPtr
+PointerWin(DeviceIntPtr dev)
+{
+    return PointerWindows[dev->id];
+}
+
+/**
  * Search for the first window below @win that has a pointer directly within
  * it's boundaries (excluding boundaries of its own descendants).
  *
@@ -105,7 +129,7 @@ FirstPointerChild(WindowPtr win)
 }
 
 /**
- * Search for the first window below @win that has a pointer directly within
+ * Search for the first window below @win that has a focus directly within
  * it's boundaries (excluding boundaries of its own descendants).
  *
  * @return The child window that has the pointer within its boundaries or
@@ -125,8 +149,6 @@ FirstFocusChild(WindowPtr win)
     return NULL;
 }
 
-
-
 /**
  * Set the presence flag for @dev to mark that it is now in @win.
  */
@@ -581,3 +603,767 @@ DoEnterLeaveEvents(DeviceIntPtr pDev,
     CoreEnterLeaveEvents(pDev, fromWin, toWin, mode);
     DeviceEnterLeaveEvents(pDev, fromWin, toWin, mode);
 }
+
+/**
+ * Send focus out events to all windows between @child and @ancestor.
+ * Events are sent running up the hierarchy.
+ */
+static void
+DeviceFocusOutEvents(DeviceIntPtr dev,
+                     WindowPtr child,
+                     WindowPtr ancestor,
+                     int mode,
+                     int detail)
+{
+    WindowPtr  win;
+
+    if (ancestor == child)
+	return;
+    for (win = child->parent; win != ancestor; win = win->parent)
+        DeviceFocusEvent(dev, DeviceFocusOut, mode, detail, win);
+}
+
+
+/**
+ * Send enter notifies to all windows between @ancestor and @child (excluding
+ * both). Events are sent running up the window hierarchy. This function
+ * recurses.
+ */
+static void
+DeviceFocusInEvents(DeviceIntPtr dev,
+                    WindowPtr ancestor,
+                    WindowPtr child,
+                    int mode,
+                    int detail)
+{
+    WindowPtr	parent = child->parent;
+
+    if (ancestor == parent || !parent)
+	return;
+    DeviceFocusInEvents(dev, ancestor, parent, mode, detail);
+    DeviceFocusEvent(dev, DeviceFocusIn, mode, detail, parent);
+}
+
+/**
+ * Send FocusIn events to all windows between @ancestor and @child (excluding
+ * both). Events are sent running down the window hierarchy. This function
+ * recurses.
+ */
+static void
+CoreFocusInEvents(DeviceIntPtr dev,
+                  WindowPtr ancestor,
+                  WindowPtr child,
+                  int mode,
+                  int detail)
+{
+    WindowPtr	parent = child->parent;
+    if (ancestor == parent)
+	return;
+    CoreFocusInEvents(dev, ancestor, parent, mode, detail);
+
+
+    /* Case 3:
+     A is above W, B is a descendant
+
+      Classically: The move generates an FocusIn on W with a detail of
+        Virtual or NonlinearVirtual
+
+     MPX:
+        Case 3A: There is at least one other focus on W itself
+          F(W) doesn't change, so the event should be suppressed
+        Case 3B: Otherwise, if there is at least one other focus in a
+          descendant
+          F(W) stays on the same descendant, or changes to a different
+          descendant. The event should be suppressed.
+        Case 3C: Otherwise:
+          F(W) moves from a window above W to a descendant. The detail may
+          need to be changed from Virtual to NonlinearVirtual depending
+          on the previous F(W). */
+
+    if (!HasFocus(parent) && !FirstFocusChild(parent))
+            CoreFocusEvent(dev, FocusIn, mode, detail, parent);
+}
+
+static void
+CoreFocusOutEvents(DeviceIntPtr dev,
+                   WindowPtr child,
+                   WindowPtr ancestor,
+                   int mode,
+                   int detail)
+{
+    WindowPtr  win;
+
+    if (ancestor == child)
+        return;
+
+    for (win = child->parent; win != ancestor; win = win->parent)
+    {
+        /*Case 7:
+        A is a descendant of W, B is above W
+
+        Classically: A FocusOut is generated on W with a detail of Virtual
+          or NonlinearVirtual.
+
+        MPX:
+            Case 3A: There is at least one other focus on W itself
+              F(W) doesn't change, the event should be suppressed.
+            Case 3B: Otherwise, if there is at least one other focus in a
+            descendant
+             F(W) stays on the same descendant, or changes to a different
+              descendant. The event should be suppressed.
+            Case 3C: Otherwise:
+              F(W) changes from the descendant of W to a window above W.
+              The detail may need to be changed from Virtual to NonlinearVirtual
+              or vice-versa depending on the new P(W).*/
+
+        /* If one window has a focus or a child with a focuspointer, skip some
+         * work and exit. */
+        if (HasFocus(win) || FirstFocusChild(win))
+            return;
+
+        CoreFocusEvent(dev, FocusOut, mode, detail, win);
+    }
+}
+
+/**
+ * Send FocusOut(NotifyPointer) events from the current pointer window (which
+ * is a descendant of @pwin_parent) up to (excluding) @pwin_parent.
+ *
+ * NotifyPointer events are only sent for the device paired with @dev.
+ *
+ * If the current pointer window is a descendat of @exclude or an ancestor of
+ * @exclude, no events are sent. Note: If the current pointer IS @exclude,
+ * events are sent!
+ */
+static void
+CoreFocusOutNotifyPointerEvents(DeviceIntPtr dev,
+                                WindowPtr pwin_parent,
+                                WindowPtr exclude,
+                                int mode,
+                                int inclusive)
+{
+    WindowPtr P, stopAt;
+
+    P = PointerWin(GetPairedDevice(dev));
+
+    if (!P)
+        return;
+    if (!IsParent(pwin_parent, P))
+        if (!(pwin_parent == P && inclusive))
+            return;
+
+    if (exclude != None && exclude != PointerRootWin &&
+        (IsParent(exclude, P) || IsParent(P, exclude)))
+        return;
+
+    stopAt = (inclusive) ? pwin_parent->parent : pwin_parent;
+
+    for (; P && P != stopAt; P = P->parent)
+        CoreFocusEvent(dev, FocusOut, mode, NotifyPointer, P);
+}
+
+/**
+ * DO NOT CALL DIRECTLY.
+ * Recursion helper for CoreFocusInNotifyPointerEvents.
+ */
+static void
+CoreFocusInRecurse(DeviceIntPtr dev,
+                   WindowPtr win,
+                   WindowPtr stopAt,
+                   int mode,
+                   int inclusive)
+{
+    if ((!inclusive && win == stopAt) || !win)
+        return;
+
+    CoreFocusInRecurse(dev, win->parent, stopAt, mode, inclusive);
+    CoreFocusEvent(dev, FocusIn, mode, NotifyPointer, win);
+}
+
+
+/**
+ * Send FocusIn(NotifyPointer) events from @pwin_parent down to
+ * including the current pointer window (which is a descendant of @pwin_parent).
+ * If @inclusive is TRUE, @pwin_parent will receive the event too.
+ *
+ * @pwin is the pointer window.
+ *
+ * If the current pointer window is a child of @exclude, no events are sent.
+ */
+static void
+CoreFocusInNotifyPointerEvents(DeviceIntPtr dev,
+                               WindowPtr pwin_parent,
+                               WindowPtr exclude,
+                               int mode,
+                               int inclusive)
+{
+    WindowPtr P;
+
+    P = PointerWin(GetPairedDevice(dev));
+
+    if (!P || P == exclude || (pwin_parent != P && !IsParent(pwin_parent, P)))
+        return;
+
+    if (exclude != None && (IsParent(exclude, P) || IsParent(P, exclude)))
+        return;
+
+    CoreFocusInRecurse(dev, P, pwin_parent, mode, inclusive);
+}
+
+
+/**
+ * Focus of @dev moves from @A to @B and @A neither a descendant of @B nor is
+ * @B a descendant of @A.
+ */
+static void
+CoreFocusNonLinear(DeviceIntPtr dev,
+                   WindowPtr A,
+                   WindowPtr B,
+                   int mode)
+{
+    WindowPtr X = CommonAncestor(A, B);
+
+    /* Case 4:
+     A is W, B is above W
+
+    Classically: The change generates a FocusOut on W with a detail of
+       Ancestor or Nonlinear
+
+     MPX:
+        Case 3A: There is at least one other focus on W itself
+          F(W) doesn't change, the event should be suppressed
+        Case 3B: Otherwise, if there is at least one other focus in a
+        descendant of W
+          F(W) changes from W to a descendant of W. The detail field
+          is set to Inferior
+        Case 3C: Otherwise:
+          The focus window moves from W to a window above W.
+          The detail may need to be changed from Ancestor to Nonlinear or
+          vice versa depending on the the new F(W)
+     */
+
+    if (!HasFocus(A))
+    {
+        WindowPtr child = FirstFocusChild(A);
+        if (child)
+        {
+            /* NotifyPointer P-A unless P is child or below*/
+            CoreFocusOutNotifyPointerEvents(dev, A, child, mode, FALSE);
+            CoreFocusEvent(dev, FocusOut, mode, NotifyInferior, A);
+        } else
+        {
+            /* NotifyPointer P-A */
+            CoreFocusOutNotifyPointerEvents(dev, A, None, mode, FALSE);
+            CoreFocusEvent(dev, FocusOut, mode, NotifyNonlinear, A);
+        }
+    }
+
+
+    CoreFocusOutEvents(dev, A, X, mode, NotifyNonlinearVirtual);
+
+    /*
+      Case 9:
+        A is a descendant of W, B is a descendant of W
+
+        Classically: No events are generated on W
+        MPX: The focus window stays the same or moves to a different
+          descendant of W. No events should be generated on W.
+
+
+       Therefore, no event to X.
+    */
+
+    CoreFocusInEvents(dev, X, B, mode, NotifyNonlinearVirtual);
+
+    /* Case 2:
+      A is above W, B=W
+
+      Classically: The move generates an EnterNotify on W with a detail of
+        Ancestor or Nonlinear
+
+      MPX:
+        Case 2A: There is at least one other focus on W itself
+          F(W) doesn't change, so the event should be suppressed
+        Case 2B: Otherwise, if there is at least one other focus in a
+          descendant
+          F(W) moves from a descendant to W. detail is changed to Inferior.
+        Case 2C: Otherwise:
+          F(W) changes from a window above W to W itself.
+          The detail may need to be changed from Ancestor to Nonlinear
+          or vice-versa depending on the previous F(W). */
+
+     if (!HasFocus(B))
+     {
+         WindowPtr child = FirstFocusChild(B);
+         if (child)
+         {
+             CoreFocusEvent(dev, FocusIn, mode, NotifyInferior, B);
+             /* NotifyPointer B-P unless P is child or below. */
+             CoreFocusInNotifyPointerEvents(dev, B, child, mode, FALSE);
+         } else {
+             CoreFocusEvent(dev, FocusIn, mode, NotifyNonlinear, B);
+             /* NotifyPointer B-P unless P is child or below. */
+             CoreFocusInNotifyPointerEvents(dev, B, None, mode, FALSE);
+         }
+     }
+}
+
+
+/**
+ * Focus of @dev moves from @A to @B and @A is a descendant of @B.
+ */
+static void
+CoreFocusToAncestor(DeviceIntPtr dev,
+                    WindowPtr A,
+                    WindowPtr B,
+                    int mode)
+{
+    /* Case 4:
+     A is W, B is above W
+
+    Classically: The change generates a FocusOut on W with a detail of
+       Ancestor or Nonlinear
+
+     MPX:
+        Case 3A: There is at least one other focus on W itself
+          F(W) doesn't change, the event should be suppressed
+        Case 3B: Otherwise, if there is at least one other focus in a
+        descendant of W
+          F(W) changes from W to a descendant of W. The detail field
+          is set to Inferior
+        Case 3C: Otherwise:
+          The focus window moves from W to a window above W.
+          The detail may need to be changed from Ancestor to Nonlinear or
+          vice versa depending on the the new F(W)
+     */
+    if (!HasFocus(A))
+    {
+        WindowPtr child = FirstFocusChild(A);
+        if (child)
+        {
+            /* NotifyPointer P-A unless P is child or below*/
+            CoreFocusOutNotifyPointerEvents(dev, A, child, mode, FALSE);
+            CoreFocusEvent(dev, FocusOut, mode, NotifyInferior, A);
+        } else
+            CoreFocusEvent(dev, FocusOut, mode, NotifyAncestor, A);
+    }
+
+    CoreFocusOutEvents(dev, A, B, mode, NotifyVirtual);
+
+    /* Case 8:
+    A is a descendant of W, B is W
+
+    Classically: A FocusOut is generated on W with a detail of
+        NotifyInferior
+
+    MPX:
+        Case 3A: There is at least one other focus on W itself
+          F(W) doesn't change, the event should be suppressed
+        Case 3B: Otherwise:
+          F(W) changes from a descendant to W itself. */
+
+    if (!HasFocus(B))
+    {
+        CoreFocusEvent(dev, FocusIn, mode, NotifyInferior, B);
+        /* NotifyPointer B-P unless P is A or below. */
+        CoreFocusInNotifyPointerEvents(dev, B, A, mode, FALSE);
+    }
+}
+
+/**
+ * Focus of @dev moves from @A to @B and @B is a descendant of @A.
+ */
+static void
+CoreFocusToDescendant(DeviceIntPtr dev,
+                      WindowPtr A,
+                      WindowPtr B,
+                      int mode)
+{
+    /* Case 6:
+    A is W, B is a descendant of W
+
+    Classically: A FocusOut is generated on W with a detail of
+       NotifyInferior
+
+    MPX:
+        Case 3A: There is at least one other focus on W itself
+          F(W) doesn't change, the event should be suppressed
+        Case 3B: Otherwise:
+          F(W) changes from W to a descendant of W. */
+
+    if (!HasFocus(A))
+    {
+        /* NotifyPointer P-A unless P is B or below*/
+        CoreFocusOutNotifyPointerEvents(dev, A, B, mode, FALSE);
+        CoreFocusEvent(dev, FocusOut, mode, NotifyInferior, A);
+    }
+
+
+    CoreFocusInEvents(dev, A, B, mode, NotifyVirtual);
+
+    /* Case 2:
+      A is above W, B=W
+
+      Classically: The move generates an FocusIn on W with a detail of
+        Ancestor or Nonlinear
+
+      MPX:
+        Case 2A: There is at least one other focus on W itself
+          F(W) doesn't change, so the event should be suppressed
+        Case 2B: Otherwise, if there is at least one other focus in a
+          descendant
+          F(W) moves from a descendant to W. detail is changed to Inferior.
+        Case 2C: Otherwise:
+          F(W) changes from a window above W to W itself.
+          The detail may need to be changed from Ancestor to Nonlinear
+          or vice-versa depending on the previous F(W). */
+
+     if (!HasFocus(B))
+     {
+         WindowPtr child = FirstFocusChild(B);
+         if (child)
+         {
+             CoreFocusEvent(dev, FocusIn, mode, NotifyInferior, B);
+             /* NotifyPointer B-P unless P is child or below. */
+             CoreFocusInNotifyPointerEvents(dev, B, child, mode, FALSE);
+         } else
+             CoreFocusEvent(dev, FocusIn, mode, NotifyAncestor, B);
+     }
+}
+
+static BOOL
+HasOtherPointer(WindowPtr win, DeviceIntPtr exclude)
+{
+    int i;
+
+    for (i = 0; i < MAXDEVICES; i++)
+        if (i != exclude->id && PointerWindows[i] == win)
+            return TRUE;
+
+    return FALSE;
+}
+
+/**
+ * Focus moves from PointerRoot to None or from None to PointerRoot.
+ * Assumption: Neither A nor B are valid windows.
+ */
+static void
+CoreFocusPointerRootNoneSwitch(DeviceIntPtr dev,
+                               WindowPtr A, /* PointerRootWin or NoneWin */
+                               WindowPtr B, /* NoneWin or PointerRootWin */
+                               int mode)
+{
+    WindowPtr root;
+    int i;
+    int nscreens = screenInfo.numScreens;
+
+#ifdef PANORAMIX
+    if (!noPanoramiXExtension)
+        nscreens = 1;
+#endif
+
+    for (i = 0; i < nscreens; i++)
+    {
+        root = WindowTable[i];
+        if (!HasOtherPointer(root, GetPairedDevice(dev)) && !FirstFocusChild(root))
+        {
+            /* If pointer was on PointerRootWin and changes to NoneWin, and
+             * the pointer paired with @dev is below the current root window,
+             * do a NotifyPointer run. */
+            if (dev->focus && dev->focus->win == PointerRootWin &&
+                B != PointerRootWin)
+            {
+                WindowPtr ptrwin = PointerWin(GetPairedDevice(dev));
+                if (ptrwin && IsParent(root, ptrwin))
+                    CoreFocusOutNotifyPointerEvents(dev, root, None, mode, TRUE);
+            }
+            CoreFocusEvent(dev, FocusOut, mode, ((int)A) ? NotifyPointerRoot : NotifyDetailNone, root);
+            CoreFocusEvent(dev, FocusIn, mode, ((int)B) ? NotifyPointerRoot : NotifyDetailNone, root);
+            if (B == PointerRootWin)
+                CoreFocusInNotifyPointerEvents(dev, root, None, mode, TRUE);
+        }
+
+    }
+}
+
+/**
+ * Focus moves from window @A to PointerRoot or to None.
+ * Assumption: @A is a valid window and not PointerRoot or None.
+ */
+static void
+CoreFocusToPointerRootOrNone(DeviceIntPtr dev,
+                       WindowPtr A,
+                       WindowPtr B, /* PointerRootWin or NoneWin */
+                       int mode)
+{
+    WindowPtr root;
+    int i;
+    int nscreens = screenInfo.numScreens;
+
+#ifdef PANORAMIX
+    if (!noPanoramiXExtension)
+        nscreens = 1;
+#endif
+
+    if (!HasFocus(A))
+    {
+        WindowPtr child = FirstFocusChild(A);
+        if (child)
+        {
+            /* NotifyPointer P-A unless P is B or below*/
+            CoreFocusOutNotifyPointerEvents(dev, A, B, mode, FALSE);
+            CoreFocusEvent(dev, FocusOut, mode, NotifyInferior, A);
+        } else {
+            /* NotifyPointer P-A */
+            CoreFocusOutNotifyPointerEvents(dev, A, None, mode, FALSE);
+            CoreFocusEvent(dev, FocusOut, mode, NotifyNonlinear, A);
+        }
+    }
+
+    /* NullWindow means we include the root window */
+    CoreFocusOutEvents(dev, A, NullWindow, mode, NotifyNonlinearVirtual);
+
+    for (i = 0; i < nscreens; i++)
+    {
+        root = WindowTable[i];
+        if (!HasFocus(root) && !FirstFocusChild(root))
+        {
+            CoreFocusEvent(dev, FocusIn, mode, ((int)B) ? NotifyPointerRoot : NotifyDetailNone, root);
+            if (B == PointerRootWin)
+                CoreFocusInNotifyPointerEvents(dev, root, None, mode, TRUE);
+        }
+    }
+}
+
+/**
+ * Focus moves from PointerRoot or None to a window @to.
+ * Assumption: @to is a valid window and not PointerRoot or None.
+ */
+static void
+CoreFocusFromPointerRootOrNone(DeviceIntPtr dev,
+                               WindowPtr A, /* PointerRootWin or NoneWin */
+                               WindowPtr B,
+                               int mode)
+{
+    WindowPtr root;
+    int i;
+    int nscreens = screenInfo.numScreens;
+
+#ifdef PANORAMIX
+    if (!noPanoramiXExtension)
+        nscreens = 1;
+#endif
+
+    for (i = 0; i < nscreens; i++)
+    {
+        root = WindowTable[i];
+        if (!HasFocus(root) && !FirstFocusChild(root))
+        {
+            /* If pointer was on PointerRootWin and changes to NoneWin, and
+             * the pointer paired with @dev is below the current root window,
+             * do a NotifyPointer run. */
+            if (dev->focus && dev->focus->win == PointerRootWin &&
+                B != PointerRootWin)
+            {
+                WindowPtr ptrwin = PointerWin(GetPairedDevice(dev));
+                if (ptrwin)
+                    CoreFocusOutNotifyPointerEvents(dev, root, None, mode, TRUE);
+            }
+            CoreFocusEvent(dev, FocusOut, mode, ((int)A) ? NotifyPointerRoot : NotifyDetailNone, root);
+        }
+    }
+
+    root = B; /* get B's root window */
+    while(root->parent)
+        root = root->parent;
+
+    if (B != root)
+    {
+        CoreFocusEvent(dev, FocusIn, mode, NotifyNonlinearVirtual, root);
+        CoreFocusInEvents(dev, root, B, mode, NotifyNonlinearVirtual);
+    }
+
+
+    if (!HasFocus(B))
+    {
+        WindowPtr child = FirstFocusChild(B);
+        if (child)
+        {
+             CoreFocusEvent(dev, FocusIn, mode, NotifyInferior, B);
+             /* NotifyPointer B-P unless P is child or below. */
+             CoreFocusInNotifyPointerEvents(dev, B, child, mode, FALSE);
+        } else {
+            CoreFocusEvent(dev, FocusIn, mode, NotifyNonlinear, B);
+            /* NotifyPointer B-P unless P is child or below. */
+            CoreFocusInNotifyPointerEvents(dev, B, None, mode, FALSE);
+        }
+    }
+
+}
+
+static void
+CoreFocusEvents(DeviceIntPtr dev,
+                WindowPtr from,
+                WindowPtr to,
+                int mode)
+{
+    if (!dev->isMaster)
+        return;
+
+    SetFocusOut(dev, from);
+
+    if (((to == NullWindow) || (to == PointerRootWin)) &&
+        ((from == NullWindow) || (from == PointerRootWin)))
+        CoreFocusPointerRootNoneSwitch(dev, from, to, mode);
+    else if ((to == NullWindow) || (to == PointerRootWin))
+        CoreFocusToPointerRootOrNone(dev, from, to, mode);
+    else if ((from == NullWindow) || (from == PointerRootWin))
+        CoreFocusFromPointerRootOrNone(dev, from, to, mode);
+    else if (IsParent(from, to))
+        CoreFocusToDescendant(dev, from, to, mode);
+    else if (IsParent(to, from))
+        CoreFocusToAncestor(dev, from, to, mode);
+    else
+        CoreFocusNonLinear(dev, from, to, mode);
+
+    SetFocusIn(dev, to);
+}
+
+#define RootWindow(dev) dev->spriteInfo->sprite->spriteTrace[0]
+
+static void
+DeviceFocusEvents(DeviceIntPtr dev,
+                  WindowPtr from,
+                  WindowPtr to,
+                  int mode)
+{
+    int out, in;		       /* for holding details for to/from
+                                          PointerRoot/None */
+    int i;
+    int nscreens = screenInfo.numScreens;
+    SpritePtr sprite  = dev->spriteInfo->sprite;
+
+    if (from == to)
+        return;
+    out = (from == NoneWin) ? NotifyDetailNone : NotifyPointerRoot;
+    in = (to == NoneWin) ? NotifyDetailNone : NotifyPointerRoot;
+    /* wrong values if neither, but then not referenced */
+
+#ifdef PANORAMIX
+    if (!noPanoramiXExtension)
+        nscreens = 1;
+#endif
+
+    if ((to == NullWindow) || (to == PointerRootWin))
+    {
+        if ((from == NullWindow) || (from == PointerRootWin))
+        {
+            if (from == PointerRootWin)
+                DeviceFocusOutEvents(dev, sprite->win, RootWindow(dev), mode,
+                        NotifyPointer);
+            /* Notify all the roots */
+            for (i = 0; i < nscreens; i++)
+                DeviceFocusEvent(dev, FocusOut, mode, out, WindowTable[i]);
+        }
+        else
+        {
+            if (IsParent(from, sprite->win))
+                DeviceFocusOutEvents(dev, sprite->win, from, mode,
+                        NotifyPointer);
+            DeviceFocusEvent(dev, FocusOut, mode, NotifyNonlinear, from);
+            /* next call catches the root too, if the screen changed */
+            DeviceFocusOutEvents(dev, from->parent, NullWindow, mode,
+                    NotifyNonlinearVirtual);
+        }
+        /* Notify all the roots */
+        for (i = 0; i < nscreens; i++)
+            DeviceFocusEvent(dev, FocusIn, mode, in, WindowTable[i]);
+        if (to == PointerRootWin)
+            DeviceFocusInEvents(dev, RootWindow(dev), sprite->win, mode, NotifyPointer);
+    }
+    else
+    {
+        if ((from == NullWindow) || (from == PointerRootWin))
+        {
+            if (from == PointerRootWin)
+                DeviceFocusOutEvents(dev, sprite->win, RootWindow(dev), mode,
+                        NotifyPointer);
+            for (i = 0; i < nscreens; i++)
+                DeviceFocusEvent(dev, FocusOut, mode, out, WindowTable[i]);
+            if (to->parent != NullWindow)
+                DeviceFocusInEvents(dev, RootWindow(dev), to, mode, NotifyNonlinearVirtual);
+            DeviceFocusEvent(dev, FocusIn, mode, NotifyNonlinear, to);
+            if (IsParent(to, sprite->win))
+                DeviceFocusInEvents(dev, to, sprite->win, mode, NotifyPointer);
+        }
+        else
+        {
+            if (IsParent(to, from))
+            {
+                DeviceFocusEvent(dev, FocusOut, mode, NotifyAncestor, from);
+                DeviceFocusOutEvents(dev, from->parent, to, mode,
+                        NotifyVirtual);
+                DeviceFocusEvent(dev, FocusIn, mode, NotifyInferior, to);
+                if ((IsParent(to, sprite->win)) &&
+                        (sprite->win != from) &&
+                        (!IsParent(from, sprite->win)) &&
+                        (!IsParent(sprite->win, from)))
+                    DeviceFocusInEvents(dev, to, sprite->win, mode, NotifyPointer);
+            }
+            else
+                if (IsParent(from, to))
+                {
+                    if ((IsParent(from, sprite->win)) &&
+                            (sprite->win != from) &&
+                            (!IsParent(to, sprite->win)) &&
+                            (!IsParent(sprite->win, to)))
+                        DeviceFocusOutEvents(dev, sprite->win, from, mode,
+                                NotifyPointer);
+                    DeviceFocusEvent(dev, FocusOut, mode, NotifyInferior, from);
+                    DeviceFocusInEvents(dev, from, to, mode, NotifyVirtual);
+                    DeviceFocusEvent(dev, FocusIn, mode, NotifyAncestor, to);
+                }
+                else
+                {
+                    /* neither from or to is child of other */
+                    WindowPtr common = CommonAncestor(to, from);
+                    /* common == NullWindow ==> different screens */
+                    if (IsParent(from, sprite->win))
+                        DeviceFocusOutEvents(dev, sprite->win, from, mode,
+                                NotifyPointer);
+                    DeviceFocusEvent(dev, FocusOut, mode, NotifyNonlinear, from);
+                    if (from->parent != NullWindow)
+                        DeviceFocusOutEvents(dev, from->parent, common, mode,
+                                NotifyNonlinearVirtual);
+                    if (to->parent != NullWindow)
+                        DeviceFocusInEvents(dev, common, to, mode, NotifyNonlinearVirtual);
+                    DeviceFocusEvent(dev, FocusIn, mode, NotifyNonlinear, to);
+                    if (IsParent(to, sprite->win))
+                        DeviceFocusInEvents(dev, to, sprite->win, mode, NotifyPointer);
+                }
+        }
+    }
+}
+
+/**
+ * Figure out if focus events are necessary and send them to the
+ * appropriate windows.
+ *
+ * @param from Window the focus moved out of.
+ * @param to Window the focus moved into.
+ */
+void
+DoFocusEvents(DeviceIntPtr pDev,
+              WindowPtr from,
+              WindowPtr to,
+              int mode)
+{
+    if (!IsKeyboardDevice(pDev))
+        return;
+
+    if (from == to)
+	return;
+
+    CoreFocusEvents(pDev, from, to, mode);
+    DeviceFocusEvents(pDev, from, to, mode);
+}
diff --git a/dix/enterleave.h b/dix/enterleave.h
index 99e2e46c9..edca38664 100644
--- a/dix/enterleave.h
+++ b/dix/enterleave.h
@@ -38,6 +38,13 @@ extern void DoEnterLeaveEvents(
     int mode
 );
 
+extern void DoFocusEvents(
+    DeviceIntPtr pDev,
+    WindowPtr fromWin,
+    WindowPtr toWin,
+    int mode
+);
+
 extern void EnterLeaveEvent(
     DeviceIntPtr mouse,
     int type,
@@ -67,4 +74,22 @@ extern void EnterWindow(DeviceIntPtr dev,
                         WindowPtr win,
                         int mode);
 
+
+extern void CoreFocusEvent(DeviceIntPtr kbd,
+                           int type,
+                           int mode,
+                           int detail,
+                           WindowPtr pWin);
+
+extern void DeviceFocusEvent(DeviceIntPtr kbd,
+                             int type,
+                             int mode,
+                             int detail,
+                             WindowPtr pWin);
+
+extern void SetFocusIn(DeviceIntPtr kbd,
+                       WindowPtr win);
+
+extern void SetFocusOut(DeviceIntPtr dev,
+                        WindowPtr win);
 #endif /* _ENTERLEAVE_H_ */
diff --git a/dix/events.c b/dix/events.c
index 52a6ef461..c1ca4e0d2 100644
--- a/dix/events.c
+++ b/dix/events.c
@@ -4341,261 +4341,30 @@ DeviceEnterLeaveEvent(
 
 }
 
-static void
-FocusEvent(DeviceIntPtr dev, int type, int mode, int detail, WindowPtr pWin)
+void
+CoreFocusEvent(DeviceIntPtr dev, int type, int mode, int detail, WindowPtr pWin)
 {
     xEvent event;
-    int numFoci; /* zero if no device has focus on window */
-    Bool sendevent = FALSE;
-
-    if (dev != inputInfo.keyboard)
-	DeviceFocusEvent(dev, type, mode, detail, pWin);
-
-    /*
-     * Same procedure as for Enter/Leave events.
-     *
-     * Sending multiple core FocusIn/Out events to the same window may confuse
-     * the client.
-     * We can send multiple events that have detail NotifyVirtual,
-     * NotifyNonlinearVirtual, NotifyPointerRoot, NotifyDetailNone or
-     * NotifyPointer however.
-     *
-     * For standard events (NotifyAncestor, NotifyInferior, NotifyNonlinear)
-     * we only send an FocusIn event for the first kbd to set the focus. A
-     * FocusOut event is sent for the last kbd to set the focus away from the
-     * window.
-     *
-     * For events with Virtual detail, we send them only to a window that does
-     * not have a focus from another keyboard.
-     *
-     * For a window tree in the form of
-     *
-     * A -> Bf -> C -> D
-     *  \               (where B and E have focus)
-     *    -> Ef
-     *
-     * If the focus changes from E into D, a FocusOut is sent to E, a
-     * FocusIn is sent to D, a FocusIn with detail
-     * NotifyNonlinearVirtual to C and nothing to B.
-     */
 
-    if (dev->isMaster && type == FocusOut &&
-            (detail != NotifyVirtual &&
-             detail != NotifyNonlinearVirtual &&
-             detail != NotifyPointer &&
-             detail != NotifyPointerRoot &&
-             detail != NotifyDetailNone))
-       FOCUS_SEMAPHORE_UNSET(pWin, dev);
-
-    numFoci = FocusSemaphoresIsset(pWin);
-
-    if (!numFoci)
-        sendevent = TRUE;
-    else if (mode == NotifyUngrab && FOCUS_SEMAPHORE_ISSET(pWin, dev))
-        sendevent = TRUE;
-
-    if (sendevent)
-    {
-        event.u.focus.mode = mode;
-        event.u.u.type = type;
-        event.u.u.detail = detail;
-        event.u.focus.window = pWin->drawable.id;
-        (void)DeliverEventsToWindow(dev, pWin, &event, 1,
-                                    filters[dev->id][type], NullGrab, 0);
-        if ((type == FocusIn) &&
-                ((pWin->eventMask | wOtherEventMasks(pWin)) & KeymapStateMask))
-        {
-            xKeymapEvent ke;
-            ClientPtr client = clients[CLIENT_ID(pWin->drawable.id)];
-            if (XaceHook(XACE_DEVICE_ACCESS, client, dev, FALSE))
-                memmove((char *)&ke.map[0], (char *)&dev->key->down[1], 31);
-            else
-                bzero((char *)&ke.map[0], 31);
-
-            ke.type = KeymapNotify;
-            (void)DeliverEventsToWindow(dev, pWin, (xEvent *)&ke, 1,
-                                        KeymapStateMask, NullGrab, 0);
-        }
-    }
-
-    if (dev->isMaster && type == FocusIn &&
-            (detail != NotifyVirtual &&
-             detail != NotifyNonlinearVirtual &&
-             detail != NotifyPointer &&
-             detail != NotifyPointerRoot &&
-             detail != NotifyDetailNone))
-        FOCUS_SEMAPHORE_SET(pWin, dev);
-}
-
- /*
-  * recursive because it is easier
-  * no-op if child not descended from ancestor
-  */
-static Bool
-FocusInEvents(
-    DeviceIntPtr dev,
-    WindowPtr ancestor, WindowPtr child, WindowPtr skipChild,
-    int mode, int detail,
-    Bool doAncestor)
-{
-    if (child == NullWindow)
-	return ancestor == NullWindow;
-    if (ancestor == child)
-    {
-	if (doAncestor)
-	    FocusEvent(dev, FocusIn, mode, detail, child);
-	return TRUE;
-    }
-    if (FocusInEvents(dev, ancestor, child->parent, skipChild, mode, detail,
-		      doAncestor))
+    event.u.focus.mode = mode;
+    event.u.u.type = type;
+    event.u.u.detail = detail;
+    event.u.focus.window = pWin->drawable.id;
+    (void)DeliverEventsToWindow(dev, pWin, &event, 1,
+            filters[dev->id][type], NullGrab, 0);
+    if ((type == FocusIn) &&
+            ((pWin->eventMask | wOtherEventMasks(pWin)) & KeymapStateMask))
     {
-	if (child != skipChild)
-	    FocusEvent(dev, FocusIn, mode, detail, child);
-	return TRUE;
-    }
-    return FALSE;
-}
-
-/* dies horribly if ancestor is not an ancestor of child */
-static void
-FocusOutEvents(
-    DeviceIntPtr dev,
-    WindowPtr child, WindowPtr ancestor,
-    int mode, int detail,
-    Bool doAncestor)
-{
-    WindowPtr  pWin;
-
-    for (pWin = child; pWin != ancestor; pWin = pWin->parent)
-	FocusEvent(dev, FocusOut, mode, detail, pWin);
-    if (doAncestor)
-	FocusEvent(dev, FocusOut, mode, detail, ancestor);
-}
-
-void
-DoFocusEvents(DeviceIntPtr dev, WindowPtr fromWin, WindowPtr toWin, int mode)
-{
-    int     out, in;		       /* for holding details for to/from
-				          PointerRoot/None */
-    int     i;
-    SpritePtr pSprite = dev->spriteInfo->sprite;
-
-    if (fromWin == toWin)
-	return;
-    out = (fromWin == NoneWin) ? NotifyDetailNone : NotifyPointerRoot;
-    in = (toWin == NoneWin) ? NotifyDetailNone : NotifyPointerRoot;
- /* wrong values if neither, but then not referenced */
+        xKeymapEvent ke;
+        ClientPtr client = clients[CLIENT_ID(pWin->drawable.id)];
+        if (XaceHook(XACE_DEVICE_ACCESS, client, dev, FALSE))
+            memmove((char *)&ke.map[0], (char *)&dev->key->down[1], 31);
+        else
+            bzero((char *)&ke.map[0], 31);
 
-    if ((toWin == NullWindow) || (toWin == PointerRootWin))
-    {
-	if ((fromWin == NullWindow) || (fromWin == PointerRootWin))
-	{
-	    if (fromWin == PointerRootWin)
-                FocusOutEvents(dev, pSprite->win, RootWindow(dev), mode,
-                               NotifyPointer, TRUE);
-	    /* Notify all the roots */
-#ifdef PANORAMIX
-	    if ( !noPanoramiXExtension )
-	        FocusEvent(dev, FocusOut, mode, out, WindowTable[0]);
-	    else
-#endif
-	        for (i=0; i<screenInfo.numScreens; i++)
-	            FocusEvent(dev, FocusOut, mode, out, WindowTable[i]);
-	}
-	else
-	{
-	    if (IsParent(fromWin, pSprite->win))
-	      FocusOutEvents(dev, pSprite->win, fromWin, mode, NotifyPointer,
-			     FALSE);
-	    FocusEvent(dev, FocusOut, mode, NotifyNonlinear, fromWin);
-	    /* next call catches the root too, if the screen changed */
-	    FocusOutEvents(dev, fromWin->parent, NullWindow, mode,
-			   NotifyNonlinearVirtual, FALSE);
-	}
-	/* Notify all the roots */
-#ifdef PANORAMIX
-	if ( !noPanoramiXExtension )
-	    FocusEvent(dev, FocusIn, mode, in, WindowTable[0]);
-	else
-#endif
-	    for (i=0; i<screenInfo.numScreens; i++)
-	        FocusEvent(dev, FocusIn, mode, in, WindowTable[i]);
-	if (toWin == PointerRootWin)
-	    (void)FocusInEvents(dev, RootWindow(dev), pSprite->win,
-				NullWindow, mode, NotifyPointer, TRUE);
-    }
-    else
-    {
-	if ((fromWin == NullWindow) || (fromWin == PointerRootWin))
-	{
-	    if (fromWin == PointerRootWin)
-		FocusOutEvents(dev, pSprite->win, RootWindow(dev), mode,
-			       NotifyPointer, TRUE);
-#ifdef PANORAMIX
-	    if ( !noPanoramiXExtension )
-	        FocusEvent(dev, FocusOut, mode, out, WindowTable[0]);
-	    else
-#endif
-	        for (i=0; i<screenInfo.numScreens; i++)
-	            FocusEvent(dev, FocusOut, mode, out, WindowTable[i]);
-	    if (toWin->parent != NullWindow)
-	      (void)FocusInEvents(dev, RootWindow(dev), toWin, toWin, mode,
-				  NotifyNonlinearVirtual, TRUE);
-	    FocusEvent(dev, FocusIn, mode, NotifyNonlinear, toWin);
-	    if (IsParent(toWin, pSprite->win))
-	       (void)FocusInEvents(dev, toWin, pSprite->win, NullWindow, mode,
-				   NotifyPointer, FALSE);
-	}
-	else
-	{
-	    if (IsParent(toWin, fromWin))
-	    {
-		FocusEvent(dev, FocusOut, mode, NotifyAncestor, fromWin);
-		FocusOutEvents(dev, fromWin->parent, toWin, mode,
-			       NotifyVirtual, FALSE);
-		FocusEvent(dev, FocusIn, mode, NotifyInferior, toWin);
-		if ((IsParent(toWin, pSprite->win)) &&
-			(pSprite->win != fromWin) &&
-			(!IsParent(fromWin, pSprite->win)) &&
-			(!IsParent(pSprite->win, fromWin)))
-		    (void)FocusInEvents(dev, toWin, pSprite->win, NullWindow,
-					mode, NotifyPointer, FALSE);
-	    }
-	    else
-		if (IsParent(fromWin, toWin))
-		{
-		    if ((IsParent(fromWin, pSprite->win)) &&
-			    (pSprite->win != fromWin) &&
-			    (!IsParent(toWin, pSprite->win)) &&
-			    (!IsParent(pSprite->win, toWin)))
-			FocusOutEvents(dev, pSprite->win, fromWin, mode,
-				       NotifyPointer, FALSE);
-		    FocusEvent(dev, FocusOut, mode, NotifyInferior, fromWin);
-		    (void)FocusInEvents(dev, fromWin, toWin, toWin, mode,
-					NotifyVirtual, FALSE);
-		    FocusEvent(dev, FocusIn, mode, NotifyAncestor, toWin);
-		}
-		else
-		{
-		/* neither fromWin or toWin is child of other */
-		    WindowPtr common = CommonAncestor(toWin, fromWin);
-		/* common == NullWindow ==> different screens */
-		    if (IsParent(fromWin, pSprite->win))
-			FocusOutEvents(dev, pSprite->win, fromWin, mode,
-				       NotifyPointer, FALSE);
-		    FocusEvent(dev, FocusOut, mode, NotifyNonlinear, fromWin);
-		    if (fromWin->parent != NullWindow)
-		      FocusOutEvents(dev, fromWin->parent, common, mode,
-				     NotifyNonlinearVirtual, FALSE);
-		    if (toWin->parent != NullWindow)
-		      (void)FocusInEvents(dev, common, toWin, toWin, mode,
-					  NotifyNonlinearVirtual, FALSE);
-		    FocusEvent(dev, FocusIn, mode, NotifyNonlinear, toWin);
-		    if (IsParent(toWin, pSprite->win))
-			(void)FocusInEvents(dev, toWin, pSprite->win, NullWindow,
-					    mode, NotifyPointer, FALSE);
-		}
-	}
+        ke.type = KeymapNotify;
+        (void)DeliverEventsToWindow(dev, pWin, (xEvent *)&ke, 1,
+                KeymapStateMask, NullGrab, 0);
     }
 }
 
@@ -6144,18 +5913,3 @@ ExtGrabDevice(ClientPtr client,
     return GrabSuccess;
 }
 
-/*
- * @return Zero if no devices has focus on the window, non-zero otherwise.
- */
-int
-FocusSemaphoresIsset(WindowPtr win)
-{
-    int set = 0;
-    int i;
-
-    for (i = 0; i < (MAXDEVICES + 7)/8; i++)
-        set += win->focusinout[i];
-
-    return set;
-}
-
diff --git a/dix/window.c b/dix/window.c
index ca07c9633..5e8338f2f 100644
--- a/dix/window.c
+++ b/dix/window.c
@@ -300,8 +300,6 @@ SetWindowToDefaults(WindowPtr pWin)
     pWin->redirectDraw = RedirectDrawNone;
     pWin->forcedBG = FALSE;
 
-    memset(pWin->focusinout, 0, sizeof(pWin->focusinout));
-
 #ifdef ROOTLESS
     pWin->rootlessUnhittable = FALSE;
 #endif