From 95fa7a93bc840e0f49ee30e76abb2b4f8579c997 Mon Sep 17 00:00:00 2001
From: Bjoern Erik Nilsen <bjorn.nilsen@nokia.com>
Date: Mon, 23 Mar 2009 15:54:30 +0100
Subject: Fixes:    Optimization: Clip path is empty if the bounding rect is
 empty.

RevBy:    TrustMe
---
 src/gui/graphicsview/qgraphicsitem.cpp | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/gui/graphicsview/qgraphicsitem.cpp b/src/gui/graphicsview/qgraphicsitem.cpp
index badc41e..75b6cf1 100644
--- a/src/gui/graphicsview/qgraphicsitem.cpp
+++ b/src/gui/graphicsview/qgraphicsitem.cpp
@@ -3151,9 +3151,18 @@ QPainterPath QGraphicsItem::clipPath() const
         return d->cachedClipPath;
     }
 
+    const QRectF thisBoundingRect(boundingRect());
+    if (thisBoundingRect.isEmpty()) {
+        if (d_ptr->flags & ItemClipsChildrenToShape)
+            d_ptr->setEmptyCachedClipPathRecursively();
+        else
+            d_ptr->setEmptyCachedClipPath();
+        return QPainterPath();
+    }
+
     QPainterPath clip;
     // Start with the item's bounding rect.
-    clip.addRect(boundingRect());
+    clip.addRect(thisBoundingRect);
 
     if (d->ancestorFlags & QGraphicsItemPrivate::AncestorClipsChildren) {
         const QGraphicsItem *parent = this;
-- 
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