From 5d896e43fd056d935935b4eb66562791edc247a1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Michel=20D=C3=A4nzer?= <michel@tungstengraphics.com>
Date: Mon, 11 Jun 2007 09:23:19 +0200
Subject: [PATCH] DRITreeTraversal: Stop walking tree when we've seen all DRI
 windows.

---
 hw/xfree86/dri/dri.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/hw/xfree86/dri/dri.c b/hw/xfree86/dri/dri.c
index fae0b43fb..d153c090b 100644
--- a/hw/xfree86/dri/dri.c
+++ b/hw/xfree86/dri/dri.c
@@ -1863,11 +1863,15 @@ DRITreeTraversal(WindowPtr pWin, pointer data)
     if(pDRIDrawablePriv) {
         ScreenPtr pScreen = pWin->drawable.pScreen;
         DRIScreenPrivPtr pDRIPriv = DRI_SCREEN_PRIV(pScreen);
-        RegionPtr reg = (RegionPtr)data;
 
-        REGION_UNION(pScreen, reg, reg, &(pWin->clipList));
+	if(REGION_NUM_RECTS(&(pWin->clipList)) > 0) {
+	   RegionPtr reg = (RegionPtr)data;
 
-        if(pDRIPriv->nrWindows == 1)
+	   REGION_UNION(pScreen, reg, reg, &(pWin->clipList));
+	   pDRIPriv->nrWalked++;
+	}
+
+	if(pDRIPriv->nrWindows == pDRIPriv->nrWalked)
 	   return WT_STOPWALKING;
     }
     return WT_WALKCHILDREN;
@@ -1885,6 +1889,7 @@ DRICopyWindow(WindowPtr pWin, DDXPointRec ptOldOrg, RegionPtr prgnSrc)
        RegionRec reg;
 
        REGION_NULL(pScreen, &reg);
+       pDRIPriv->nrWalked = 0;
        TraverseTree(pWin, DRITreeTraversal, (pointer)(&reg));
 
        if(REGION_NOTEMPTY(pScreen, &reg)) {