Fix some memory management issues

aka reduce noise in valgrind memory analyzer

python/core/qgsfield.sip

@@ -149,13 +149,14 @@ public:
   void extend( const QgsFields& other );
 
 
-  QgsField& operator[](int i);
+  QgsField& operator[](int i) /Factory/;
 %MethodCode
-  int idx = (int)sipConvertFromSequenceIndex(a0, sipCpp->count());
+  int idx = sipConvertFromSequenceIndex(a0, sipCpp->count());
   if (idx < 0)
     sipIsErr = 1;
   else
     sipRes = new QgsField(sipCpp->operator[](idx));
+
 %End
 
 /*  SIP_PYOBJECT __getitem__(int key);

src/app/qgisapp.cpp

@@ -745,44 +745,46 @@ QgisApp::~QgisApp()
 #ifdef HAVE_TOUCH
   delete mMapTools.mTouch;
 #endif
-  delete mMapTools.mIdentify;
+  delete mMapTools.mAddFeature;
+  delete mMapTools.mAddPart;
+  delete mMapTools.mAddRing;
+  delete mMapTools.mAnnotation;
+  delete mMapTools.mChangeLabelProperties;
+  delete mMapTools.mDeletePart;
+  delete mMapTools.mDeleteRing;
   delete mMapTools.mFeatureAction;
-  delete mMapTools.mMeasureDist;
-  delete mMapTools.mMeasureArea;
-  delete mMapTools.mMeasureAngle;
-  delete mMapTools.mTextAnnotation;
   delete mMapTools.mFormAnnotation;
   delete mMapTools.mHtmlAnnotation;
-  delete mMapTools.mSvgAnnotation;
-  delete mMapTools.mAnnotation;
-  delete mMapTools.mAddFeature;
+  delete mMapTools.mIdentify;
+  delete mMapTools.mMeasureAngle;
+  delete mMapTools.mMeasureArea;
+  delete mMapTools.mMeasureDist;
   delete mMapTools.mMoveFeature;
-  delete mMapTools.mReshapeFeatures;
-  delete mMapTools.mSplitFeatures;
-  delete mMapTools.mSelect;
-  delete mMapTools.mSelectRectangle;
-  delete mMapTools.mSelectPolygon;
-  delete mMapTools.mSelectFreehand;
-  delete mMapTools.mSelectRadius;
-  delete mMapTools.mAddRing;
-  delete mMapTools.mSimplifyFeature;
-  delete mMapTools.mDeleteRing;
-  delete mMapTools.mDeletePart;
-  delete mMapTools.mAddPart;
-  delete mMapTools.mNodeTool;
-  delete mMapTools.mRotatePointSymbolsTool;
-  delete mMapTools.mPinLabels;
-  delete mMapTools.mShowHideLabels;
   delete mMapTools.mMoveLabel;
+  delete mMapTools.mNodeTool;
+  delete mMapTools.mOffsetCurve;
+  delete mMapTools.mPinLabels;
+  delete mMapTools.mReshapeFeatures;
   delete mMapTools.mRotateFeature;
   delete mMapTools.mRotateLabel;
-  delete mMapTools.mChangeLabelProperties;
-  delete mMapTools.mOffsetCurve;
+  delete mMapTools.mRotatePointSymbolsTool;
+  delete mMapTools.mSelect;
+  delete mMapTools.mSelectFreehand;
+  delete mMapTools.mSelectPolygon;
+  delete mMapTools.mSelectRadius;
+  delete mMapTools.mSelectRectangle;
+  delete mMapTools.mShowHideLabels;
+  delete mMapTools.mSimplifyFeature;
+  delete mMapTools.mSplitFeatures;
+  delete mMapTools.mSvgAnnotation;
+  delete mMapTools.mTextAnnotation;
 
-  delete mPythonUtils;
+  delete mpMaptip;
 
   delete mpGpsWidget;
 
+  delete mOverviewMapCursor;
+
   deletePrintComposers();
   removeAnnotationItems();
 
@@ -791,6 +793,11 @@ QgisApp::~QgisApp()
 
   // delete map layer registry and provider registry
   QgsApplication::exitQgis();
+
+  delete QgsProject::instance();
+
+  mPythonUtils->exitPython();
+  delete mPythonUtils;
 }
 
 void QgisApp::dragEnterEvent( QDragEnterEvent *event )
@@ -1330,7 +1337,7 @@ void QgisApp::createMenus()
   // Help menu
   // add What's this button to it
   QAction* before = mActionHelpAPI;
-  mHelpMenu->insertAction( before, QWhatsThis::createAction() );
+  mHelpMenu->insertAction( before, QWhatsThis::createAction( this ) );
 }
 
 void QgisApp::createToolBars()
@@ -1457,7 +1464,7 @@ void QgisApp::createToolBars()
 
   // Help Toolbar
 
-  mHelpToolBar->addAction( QWhatsThis::createAction() );
+  mHelpToolBar->addAction( QWhatsThis::createAction( this ) );
 
 }
 
@@ -2173,6 +2180,10 @@ bool QgisApp::createDB()
         return false;
       }
     }
+    else
+    {
+      sqlite3_free( errmsg );
+    }
 
     if ( sqlite3_exec( db, "DROP VIEW vw_srs", 0, 0, &errmsg ) != SQLITE_OK )
     {

src/core/qgscoordinatetransform.cpp

@@ -155,7 +155,9 @@ void QgsCoordinateTransform::initialise()
   }
 
   // init the projections (destination and source)
+  pj_free( mDestinationProjection );
   mDestinationProjection = pj_init_plus( mDestCRS.toProj4().toUtf8() );
+  pj_free( mSourceProjection );
   mSourceProjection = pj_init_plus( mSourceCRS.toProj4().toUtf8() );
 
 #ifdef COORDINATE_TRANSFORM_VERBOSE

src/core/qgsvectorfilewriter.cpp

@@ -378,8 +378,10 @@ QgsVectorFileWriter::QgsVectorFileWriter(
                       .arg( attrField.name() )
                       .arg( QString::fromUtf8( CPLGetLastErrorMsg() ) );
       mError = ErrAttributeCreationFailed;
+      OGR_Fld_Destroy( fld );
       return;
     }
+    OGR_Fld_Destroy( fld );
 
     int ogrIdx = OGR_FD_GetFieldIndex( defn, mCodec->fromUnicode( attrField.name() ) );
     if ( ogrIdx < 0 )

src/core/qgsvectorlayer.cpp

@@ -201,6 +201,8 @@ QgsVectorLayer::~QgsVectorLayer()
 
   delete mActions;
 
+  delete mRendererV2;
+
   //delete remaining overlays
 
   QList<QgsVectorOverlay*>::iterator overlayIt = mOverlays.begin();