From 48fc0e41e5e00023734ddd79cd364a15f56af246 Mon Sep 17 00:00:00 2001
From: David Aguilar <davvid@gmail.com>
Date: Wed, 28 Dec 2011 16:31:58 -0800
Subject: [PATCH] dag: Drastically speedup rendering performance

Use an OpenGL viewport to speedup rendering.

This makes the DAG very fast even on very large graphs such as git.git.

Signed-off-by: David Aguilar <davvid@gmail.com>
---
 cola/dag/view.py | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/cola/dag/view.py b/cola/dag/view.py
index 6e32cf5b..d060c5eb 100644
--- a/cola/dag/view.py
+++ b/cola/dag/view.py
@@ -793,7 +793,15 @@ class Label(QtGui.QGraphicsItem):
 
 class GraphView(QtGui.QGraphicsView):
     def __init__(self, notifier):
-        QtGui.QGraphicsView.__init__(self)
+        super(GraphView, self).__init__()
+
+        try:
+            from PyQt4 import QtOpenGL
+            glformat = QtOpenGL.QGLFormat(QtOpenGL.QGL.SampleBuffers)
+            self.glwidget = QtOpenGL.QGLWidget(glformat)
+            self.setViewport(self.glwidget)
+        except:
+            pass
 
         self.x_off = 132
         self.y_off = 32
-- 
2.11.4.GIT