From 5b824ac85e86ff4bccc7aeb81a5c48461fcc4def Mon Sep 17 00:00:00 2001
From: ahuarte47 <ahuarte47@yahoo.es>
Date: Mon, 3 Mar 2014 23:53:41 +0100
Subject: [PATCH] Fix for #9655: fix invalid polygons with buffer_0

---
 src/core/qgspallabeling.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/core/qgspallabeling.cpp b/src/core/qgspallabeling.cpp
index 6a240787f2c3..72ed03de8267 100644
--- a/src/core/qgspallabeling.cpp
+++ b/src/core/qgspallabeling.cpp
@@ -1818,6 +1818,12 @@ void QgsPalLayerSettings::registerFeature( QgsVectorLayer* layer,  QgsFeature& f
     }
   }
 
+  // fix invalid polygons
+  if ( geom->type() == QGis::Polygon && !geom->isGeosValid() )
+  {
+    geom->fromGeos( GEOSBuffer( geom->asGeos(), 0, 0 ) );
+  }
+
   // CLIP the geometry if it is bigger than the extent
   // don't clip if centroid is requested for whole feature
   bool do_clip = false;