From 1ad8ba358eeb14ab7ab3a493ba58830a326ecf17 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Thu, 5 Nov 2015 14:38:04 +0000
Subject: [PATCH] From Mathias Froehlich, "Avoid per frame X11 roundtrips"

git-svn-id: http://svn.openscenegraph.org/osg/OpenSceneGraph/trunk@15173 16af8721-9629-0410-8352-f15c8da7e697
---
 src/osgViewer/GraphicsWindowX11.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/osgViewer/GraphicsWindowX11.cpp b/src/osgViewer/GraphicsWindowX11.cpp
index fcad95f97..d652b5d24 100644
--- a/src/osgViewer/GraphicsWindowX11.cpp
+++ b/src/osgViewer/GraphicsWindowX11.cpp
@@ -1220,6 +1220,7 @@ bool GraphicsWindowX11::checkEvents()
     int windowY = _traits->y;
     int windowWidth = _traits->width;
     int windowHeight = _traits->height;
+    bool needNewWindowSize = false;
 
     Time firstEventTime = 0;
 
@@ -1275,6 +1276,7 @@ bool GraphicsWindowX11::checkEvents()
                     windowWidth = ev.xconfigure.width;
                     windowHeight = ev.xconfigure.height;
                 }
+                needNewWindowSize = true;
 
                 break;
             }
@@ -1294,6 +1296,7 @@ bool GraphicsWindowX11::checkEvents()
                     windowWidth = watt.width;
                     windowHeight = watt.height;
                 }
+                needNewWindowSize = true;
 
                 break;
             }
@@ -1552,6 +1555,7 @@ bool GraphicsWindowX11::checkEvents()
 
 
     // get window geometry relative to root window/screen
+    if (needNewWindowSize)
     {
         XWindowAttributes watt;
         Window child_return;