add symbol ASSERTions

git-svn-id: http://svn.osgeo.org/qgis/trunk@14253 c8812cc2-4d05-0410-92ff-de0c093fc19c

src/core/symbology-ng/qgssinglesymbolrendererv2.cpp

@@ -12,9 +12,10 @@
 #include <QDomElement>
 
 QgsSingleSymbolRendererV2::QgsSingleSymbolRendererV2( QgsSymbolV2* symbol )
-    : QgsFeatureRendererV2( "singleSymbol" ),
-    mTempSymbol( NULL )
+    : QgsFeatureRendererV2( "singleSymbol" )
+    , mTempSymbol( NULL )
 {
+  Q_ASSERT( symbol );
   mSymbol = symbol;
 }
 
@@ -59,8 +60,8 @@ QgsSymbolV2* QgsSingleSymbolRendererV2::symbolForFeature( QgsFeature& feature )
 
 void QgsSingleSymbolRendererV2::startRender( QgsRenderContext& context, const QgsVectorLayer *vlayer )
 {
-  mRotationFieldIdx  = ( mRotationField.isEmpty()  ? -1 : vlayer->fieldNameIndex( mRotationField ) );
-  mSizeScaleFieldIdx = ( mSizeScaleField.isEmpty() ? -1 : vlayer->fieldNameIndex( mSizeScaleField ) );
+  mRotationFieldIdx  = mRotationField.isEmpty()  ? -1 : vlayer->fieldNameIndex( mRotationField );
+  mSizeScaleFieldIdx = mSizeScaleField.isEmpty() ? -1 : vlayer->fieldNameIndex( mSizeScaleField );
 
   mSymbol->startRender( context );
 
@@ -121,6 +122,7 @@ QgsSymbolV2* QgsSingleSymbolRendererV2::symbol() const
 
 void QgsSingleSymbolRendererV2::setSymbol( QgsSymbolV2* s )
 {
+  Q_ASSERT( s );
   delete mSymbol;
   mSymbol = s;
 }

src/core/symbology-ng/qgssymbollayerv2utils.cpp

@@ -223,6 +223,8 @@ QIcon QgsSymbolLayerV2Utils::symbolPreviewIcon( QgsSymbolV2* symbol, QSize size
 
 QPixmap QgsSymbolLayerV2Utils::symbolPreviewPixmap( QgsSymbolV2* symbol, QSize size )
 {
+  Q_ASSERT( symbol );
+
   QPixmap pixmap( size );
   QPainter painter;
   painter.begin( &pixmap );
@@ -472,6 +474,8 @@ static QString _nameForSymbolType( QgsSymbolV2::SymbolType type )
 
 QDomElement QgsSymbolLayerV2Utils::saveSymbol( QString name, QgsSymbolV2* symbol, QDomDocument& doc, QgsSymbolV2Map* subSymbols )
 {
+  Q_ASSERT( symbol );
+
   QDomElement symEl = doc.createElement( "symbol" );
   symEl.setAttribute( "type", _nameForSymbolType( symbol->type() ) );
   symEl.setAttribute( "name", name );