From 328621509f4690fb945201a90425662e4fd2fc2d Mon Sep 17 00:00:00 2001
From: Dennis Kasprzyk <onestone@opencompositing.org>
Date: Thu, 29 May 2008 11:25:21 +0200
Subject: R1/2/3/4/5xx: fixed calculation of cliprects in CopyBuffer.

---
 src/mesa/drivers/dri/radeon/radeon_ioctl.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

(limited to 'src/mesa/drivers/dri/radeon/radeon_ioctl.c')

diff --git a/src/mesa/drivers/dri/radeon/radeon_ioctl.c b/src/mesa/drivers/dri/radeon/radeon_ioctl.c
index 078ac9a29a2..446025b6312 100644
--- a/src/mesa/drivers/dri/radeon/radeon_ioctl.c
+++ b/src/mesa/drivers/dri/radeon/radeon_ioctl.c
@@ -919,16 +919,18 @@ void radeonCopyBuffer( __DRIdrawablePrivate *dPriv,
 	      if (rect->y2 < b->y2)
 		  b->y2 = rect->y2;
 
-	      if (b->x1 < b->x2 && b->y1 < b->y2)
-		  b++;
+	      if (b->x1 >= b->x2 || b->y1 >= b->y2)
+		  continue;
 	  }
-	  else
-	      b++;
 
+	  b++;
 	  n++;
       }
       rmesa->sarea->nbox = n;
 
+      if (!n)
+	 continue;
+
       ret = drmCommandNone( rmesa->dri.fd, DRM_RADEON_SWAP );
 
       if ( ret ) {
-- 
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