Index: win32ss/gdi/ntgdi/cliprgn.c
===================================================================
--- win32ss/gdi/ntgdi/cliprgn.c	(revision 76027)
+++ win32ss/gdi/ntgdi/cliprgn.c	(working copy)
@@ -70,6 +70,9 @@
     PREGION prgn,
     int fnMode)
 {
+    int ret;
+    RECTL rect1, rect2;
+
     if (fnMode == RGN_COPY)
     {
         if (!prgn)
@@ -88,7 +91,18 @@
 
         dc->fs |= DC_FLAG_DIRTY_RAO;
 
-        return IntGdiCombineRgn(dc->dclevel.prgnClip, prgn, NULL, RGN_COPY);
+        ret = IntGdiCombineRgn(dc->dclevel.prgnClip, prgn, NULL, RGN_COPY);
+
+        if (dc->prgnVis)
+        {
+            REGION_GetRgnBox(dc->prgnVis, &rect1);
+            REGION_GetRgnBox(dc->dclevel.prgnClip, &rect2);
+
+            if (!RECTL_bIntersectRect(&rect1, &rect1, &rect2))
+                ret = NULLREGION;
+        }
+
+        return ret;
     }
 
     ASSERT(prgn != NULL);
@@ -103,7 +117,18 @@
 
     dc->fs |= DC_FLAG_DIRTY_RAO;
 
-    return IntGdiCombineRgn(dc->dclevel.prgnClip, dc->dclevel.prgnClip, prgn, fnMode);
+    ret = IntGdiCombineRgn(dc->dclevel.prgnClip, dc->dclevel.prgnClip, prgn, fnMode);
+
+    if (dc->prgnVis)
+    {
+        REGION_GetRgnBox(dc->prgnVis, &rect1);
+        REGION_GetRgnBox(dc->dclevel.prgnClip, &rect2);
+
+        if (!RECTL_bIntersectRect(&rect1, &rect1, &rect2))
+            ret = NULLREGION;
+    }
+
+    return ret;
 }