4 files changed, 53 insertions, 0 deletions

diff --git a/composite/compinit.c b/composite/compinit.c
index 1db9e0bf5..48e938fac 100644
--- a/composite/compinit.c
+++ b/composite/compinit.c
@@ -229,6 +229,28 @@ CompositeRegisterAlternateVisuals(ScreenPtr pScreen, VisualID * vids,
     return compRegisterAlternateVisuals(cs, vids, nVisuals);
 }
 
+Bool
+CompositeRegisterImplicitRedirectionException(ScreenPtr pScreen,
+                                              VisualID parentVisual,
+                                              VisualID winVisual)
+{
+    CompScreenPtr cs = GetCompScreen(pScreen);
+    CompImplicitRedirectException *p;
+
+    p = realloc(cs->implicitRedirectExceptions,
+                sizeof(p[0]) * (cs->numImplicitRedirectExceptions + 1));
+    if (p == NULL)
+        return FALSE;
+
+    p[cs->numImplicitRedirectExceptions].parentVisual = parentVisual;
+    p[cs->numImplicitRedirectExceptions].winVisual = winVisual;
+
+    cs->implicitRedirectExceptions = p;
+    cs->numImplicitRedirectExceptions++;
+
+    return TRUE;
+}
+
 typedef struct _alternateVisual {
     int depth;
     CARD32 format;
@@ -349,6 +371,8 @@ compScreenInit(ScreenPtr pScreen)
 
     cs->numAlternateVisuals = 0;
     cs->alternateVisuals = NULL;
+    cs->numImplicitRedirectExceptions = 0;
+    cs->implicitRedirectExceptions = NULL;
 
     if (!compAddAlternateVisuals(pScreen, cs)) {
         free(cs);
diff --git a/composite/compint.h b/composite/compint.h
index 12dc8b3f7..56b76c540 100644
--- a/composite/compint.h
+++ b/composite/compint.h
@@ -119,6 +119,11 @@ typedef struct _CompOverlayClientRec {
     XID resource;
 } CompOverlayClientRec;
 
+typedef struct _CompImplicitRedirectException {
+    XID parentVisual;
+    XID winVisual;
+} CompImplicitRedirectException;
+
 typedef struct _CompScreen {
     PositionWindowProcPtr PositionWindow;
     CopyWindowProcPtr CopyWindow;
@@ -155,6 +160,8 @@ typedef struct _CompScreen {
     CloseScreenProcPtr CloseScreen;
     int numAlternateVisuals;
     VisualID *alternateVisuals;
+    int numImplicitRedirectExceptions;
+    CompImplicitRedirectException *implicitRedirectExceptions;
 
     WindowPtr pOverlayWin;
     Window overlayWid;
diff --git a/composite/compositeext.h b/composite/compositeext.h
index 0b148f029..b96cb1d68 100644
--- a/composite/compositeext.h
+++ b/composite/compositeext.h
@@ -35,6 +35,10 @@ extern _X_EXPORT Bool CompositeRegisterAlternateVisuals(ScreenPtr pScreen,
                                                         VisualID * vids,
                                                         int nVisuals);
 
+extern _X_EXPORT Bool CompositeRegisterImplicitRedirectionException(ScreenPtr pScreen,
+                                                                    VisualID parentVisual,
+                                                                    VisualID winVisual);
+
 extern _X_EXPORT RESTYPE CompositeClientWindowType;
 
 #endif                          /* _COMPOSITEEXT_H_ */
diff --git a/composite/compwindow.c b/composite/compwindow.c
index 6c2434959..882429414 100644
--- a/composite/compwindow.c
+++ b/composite/compwindow.c
@@ -336,6 +336,21 @@ compIsAlternateVisual(ScreenPtr pScreen, XID visual)
 }
 
 static Bool
+compIsImplicitRedirectException(ScreenPtr pScreen,
+                                XID parentVisual, XID winVisual)
+{
+    CompScreenPtr cs = GetCompScreen(pScreen);
+    int i;
+
+    for (i = 0; i < cs->numImplicitRedirectExceptions; i++)
+        if (cs->implicitRedirectExceptions[i].parentVisual == parentVisual &&
+            cs->implicitRedirectExceptions[i].winVisual == winVisual)
+            return TRUE;
+
+    return FALSE;
+}
+
+static Bool
 compImplicitRedirect(WindowPtr pWin, WindowPtr pParent)
 {
     if (pParent) {
@@ -343,6 +358,9 @@ compImplicitRedirect(WindowPtr pWin, WindowPtr pParent)
         XID winVisual = wVisual(pWin);
         XID parentVisual = wVisual(pParent);
 
+        if (compIsImplicitRedirectException(pScreen, parentVisual, winVisual))
+            return FALSE;
+
         if (winVisual != parentVisual &&
             (compIsAlternateVisual(pScreen, winVisual) ||
              compIsAlternateVisual(pScreen, parentVisual)))