Inverted polygons: fix memory leaks

Author: Hugo Mercier

src/core/qgsgeometry.cpp

@@ -6402,16 +6402,18 @@ namespace QgsGeometryAlgorithms
 
 QgsGeometry* unaryUnion( const QList<QgsGeometry*>& geometryList )
 {
-  QList<GEOSGeometry*> geoms;
+  QVector<GEOSGeometry*> geoms;
   foreach( QgsGeometry* g, geometryList )
   {
-    // const cast: it is ok here, since the pointers will only be used to be stored
-    // in a list for a call to union
-    geoms.append( const_cast<GEOSGeometry*>(g->asGeos()) );
+    geoms.append( GEOSGeom_clone(g->asGeos()) );
   }
-  GEOSGeometry* unioned = _makeUnion( geoms );
+
+  GEOSGeometry* geomCollection = 0;
+  geomCollection = createGeosCollection( GEOS_GEOMETRYCOLLECTION, geoms );
+  GEOSGeometry* geomUnion = GEOSUnaryUnion( geomCollection );
+  GEOSGeom_destroy( geomCollection );
   QgsGeometry *ret = new QgsGeometry();
-  ret->fromGeos( unioned );
+  ret->fromGeos( geomUnion );
   return ret;
 }
 

src/core/symbology-ng/qgsinvertedpolygonrenderer.cpp

@@ -73,6 +73,7 @@ void QgsInvertedPolygonRenderer::startRender( QgsRenderContext& context, const Q
   mSubRenderer->startRender( context, fields );
 
   mFeaturesCategories.clear();
+  mSymbolCategories.clear();
   mFeatureDecorations.clear();
   mFields = fields;
 
@@ -279,6 +280,13 @@ void QgsInvertedPolygonRenderer::stopRender( QgsRenderContext& context )
     }
     mSubRenderer->renderFeature( feat, mContext );
   }
+  for ( FeatureCategoryVector::iterator cit = mFeaturesCategories.begin(); cit != mFeaturesCategories.end(); ++cit )
+  {
+    foreach( QgsGeometry* g, cit->geometries )
+    {
+      delete g;
+    }
+  }
 
   // when no features are visible, we still have to draw the exterior rectangle
   // warning: when sub renderers have more than one possible symbols,