From f5589e3b4d352b9b8d9fd54e974d548713e7b640 Mon Sep 17 00:00:00 2001
From: Rhys Weatherley <rhys.weatherley@nokia.com>
Date: Fri, 30 Oct 2009 13:37:18 +1000
Subject: Make it possible to set the OpenVG swap interval

The QT_VG_SWAP_INTERVAL environment variable can be used to
specify a value for eglSwapInterval().

Task-number: QT-2409
Reviewed-by: trustme
---
 src/openvg/qwindowsurface_vgegl.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/openvg/qwindowsurface_vgegl.cpp b/src/openvg/qwindowsurface_vgegl.cpp
index 103f84d..29d82c8 100644
--- a/src/openvg/qwindowsurface_vgegl.cpp
+++ b/src/openvg/qwindowsurface_vgegl.cpp
@@ -193,6 +193,13 @@ static QEglContext *createContext(QPaintDevice *device)
         return 0;
     }
 
+    // Set the swap interval for the display.
+    QByteArray interval = qgetenv("QT_VG_SWAP_INTERVAL");
+    if (!interval.isEmpty())
+        eglSwapInterval(context->display(), interval.toInt());
+    else
+        eglSwapInterval(context->display(), 1);
+
     // Choose an appropriate configuration for rendering into the device.
     QEglProperties configProps;
     configProps.setPaintDeviceFormat(device);
-- 
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