Fix #10819 (simple/marker line with offset on the wrong side of inner…

… rings)

python/core/symbology-ng/qgslinesymbollayerv2.sip

@@ -125,6 +125,8 @@ class QgsMarkerLineSymbolLayerV2 : QgsLineSymbolLayerV2
 
     void renderPolyline( const QPolygonF& points, QgsSymbolV2RenderContext& context );
 
+    void renderPolygonOutline( const QPolygonF& points, QList<QPolygonF>* rings, QgsSymbolV2RenderContext& context );
+
     QgsStringMap properties() const;
 
     QgsSymbolLayerV2* clone() const;

src/core/symbology-ng/qgslinesymbollayerv2.cpp

@@ -274,8 +274,10 @@ void QgsSimpleLineSymbolLayerV2::renderPolygonOutline( const QPolygonF& points,
   renderPolyline( points, context );
   if ( rings )
   {
+    mOffset = -mOffset; // invert the offset for rings!
     foreach ( const QPolygonF& ring, *rings )
       renderPolyline( ring, context );
+    mOffset = -mOffset;
   }
 
   if ( mDrawInsidePolygon )
@@ -848,6 +850,18 @@ void QgsMarkerLineSymbolLayerV2::renderPolyline( const QPolygonF& points, QgsSym
   }
 }
 
+void QgsMarkerLineSymbolLayerV2::renderPolygonOutline( const QPolygonF& points, QList<QPolygonF>* rings, QgsSymbolV2RenderContext& context )
+{
+  renderPolyline( points, context );
+  if ( rings )
+  {
+    mOffset = -mOffset; // invert the offset for rings!
+    foreach ( const QPolygonF& ring, *rings )
+      renderPolyline( ring, context );
+    mOffset = -mOffset;
+  }
+}
+
 void QgsMarkerLineSymbolLayerV2::renderPolylineInterval( const QPolygonF& points, QgsSymbolV2RenderContext& context )
 {
   if ( points.isEmpty() )

src/core/symbology-ng/qgslinesymbollayerv2.h

@@ -176,6 +176,8 @@ class CORE_EXPORT QgsMarkerLineSymbolLayerV2 : public QgsLineSymbolLayerV2
 
     void renderPolyline( const QPolygonF& points, QgsSymbolV2RenderContext& context );
 
+    void renderPolygonOutline( const QPolygonF& points, QList<QPolygonF>* rings, QgsSymbolV2RenderContext& context );
+
     QgsStringMap properties() const;
 
     QgsSymbolLayerV2* clone() const;