Fix #9658 (crash with diagrams)

python/core/diagram/qgsdiagram.sip

@@ -24,6 +24,9 @@ class QgsDiagram
     virtual QSizeF diagramSize( const QgsFeature& feature, const QgsRenderContext& c, const QgsDiagramSettings& s, const QgsDiagramInterpolationSettings& is ) = 0;
 
   protected:
+    QgsDiagram();
+    QgsDiagram( const QgsDiagram& other );
+
     /** Changes the pen width to match the current settings and rendering context
      *  @param pen The pen to modify
      *  @param s   The settings that specify the pen width

python/core/qgsmaprenderer.sip

@@ -55,7 +55,7 @@ class QgsLabelingEngineInterface
     //! @note: this method was added in version 1.9
     virtual QgsPalLayerSettings& layer( const QString& layerName ) = 0;
     //! adds a diagram layer to the labeling engine
-    virtual int addDiagramLayer( QgsVectorLayer* layer, QgsDiagramLayerSettings* s );
+    virtual int addDiagramLayer( QgsVectorLayer* layer, const QgsDiagramLayerSettings* s );
     //! called for every feature
     virtual void registerFeature( const QString& layerID, QgsFeature& feat, const QgsRenderContext& context = QgsRenderContext() ) = 0;
     //! called for every diagram feature

src/core/diagram/qgsdiagram.cpp

@@ -20,6 +20,19 @@
 #include <QPainter>
 
 
+
+QgsDiagram::QgsDiagram()
+{
+
+}
+
+QgsDiagram::QgsDiagram( const QgsDiagram& other )
+{
+  Q_UNUSED( other );
+  // do not copy the cached expression map - the expressions need to be created and prepared with getExpression(...) call
+}
+
+
 void QgsDiagram::clearCache()
 {
   QMapIterator<QString, QgsExpression*> i( mExpressions );

src/core/diagram/qgsdiagram.h

@@ -54,6 +54,9 @@ class CORE_EXPORT QgsDiagram
     virtual QSizeF diagramSize( const QgsFeature& feature, const QgsRenderContext& c, const QgsDiagramSettings& s, const QgsDiagramInterpolationSettings& is ) = 0;
 
   protected:
+    QgsDiagram();
+    QgsDiagram( const QgsDiagram& other );
+
     /** Changes the pen width to match the current settings and rendering context
      *  @param pen The pen to modify
      *  @param s   The settings that specify the pen width

src/core/qgsdiagramrendererv2.h

@@ -88,6 +88,7 @@ class CORE_EXPORT QgsDiagramLayerSettings
     const QgsCoordinateTransform* ct;
     const QgsMapToPixel* xform;
     QList<QgsPalGeometry*> geometries;
+    QgsFields fields;
 
     int xPosColumn; //attribute index for x coordinate (or -1 if position not data defined)
     int yPosColumn;//attribute index for y coordinate (or -1 if position not data defined)

src/core/qgsmaprenderer.h

@@ -92,7 +92,7 @@ class CORE_EXPORT QgsLabelingEngineInterface
     //! @note: this method was added in version 1.9
     virtual QgsPalLayerSettings& layer( const QString& layerName ) = 0;
     //! adds a diagram layer to the labeling engine
-    virtual int addDiagramLayer( QgsVectorLayer* layer, QgsDiagramLayerSettings* s )
+    virtual int addDiagramLayer( QgsVectorLayer* layer, const QgsDiagramLayerSettings* s )
     { Q_UNUSED( layer ); Q_UNUSED( s ); return 0; }
     //! called for every feature
     virtual void registerFeature( const QString& layerID, QgsFeature& feat, const QgsRenderContext& context = QgsRenderContext() ) = 0;

src/core/qgspalgeometry.h

@@ -118,13 +118,12 @@ class QgsPalGeometry : public PalGeometry
 
     QFontMetricsF* getLabelFontMetrics() { return mFontMetrics; }
 
-    void setDiagramAttributes( const QgsAttributes& attrs, const QgsFields* fields ) { mDiagramAttributes = attrs; mDiagramFields = fields; }
+    void setDiagramAttributes( const QgsAttributes& attrs ) { mDiagramAttributes = attrs; }
     const QgsAttributes& diagramAttributes() { return mDiagramAttributes; }
 
     void feature( QgsFeature& feature )
     {
       feature.setFeatureId( mId );
-      feature.setFields( mDiagramFields, false );
       feature.setAttributes( mDiagramAttributes );
       feature.setValid( true );
     }
@@ -147,7 +146,6 @@ class QgsPalGeometry : public PalGeometry
 
     /**Stores attribute values for diagram rendering*/
     QgsAttributes mDiagramAttributes;
-    const QgsFields* mDiagramFields;
 };
 
 #endif //QGSPALGEOMETRY_H

src/core/qgspallabeling.cpp

@@ -3342,20 +3342,25 @@ int QgsPalLabeling::prepareLayer( QgsVectorLayer* layer, QStringList& attrNames,
   return 1; // init successful
 }
 
-int QgsPalLabeling::addDiagramLayer( QgsVectorLayer* layer, QgsDiagramLayerSettings *s )
+int QgsPalLabeling::addDiagramLayer( QgsVectorLayer* layer, const QgsDiagramLayerSettings *s )
 {
   Layer* l = mPal->addLayer( layer->id().append( "d" ).toUtf8().data(), -1, -1, pal::Arrangement( s->placement ), METER, s->priority, s->obstacle, true, true );
   l->setArrangementFlags( s->placementFlags );
 
-  s->palLayer = l;
-  s->ct = 0;
+  mActiveDiagramLayers.insert( layer->id(), *s );
+  // initialize the local copy
+  QgsDiagramLayerSettings& s2 = mActiveDiagramLayers[layer->id()];
+
+  s2.palLayer = l;
+  s2.ct = 0;
   if ( mMapSettings->hasCrsTransformEnabled() )
-    s->ct = new QgsCoordinateTransform( layer->crs(), mMapSettings->destinationCrs() );
+    s2.ct = new QgsCoordinateTransform( layer->crs(), mMapSettings->destinationCrs() );
 
-  s->xform = &mMapSettings->mapToPixel();
-  mActiveDiagramLayers.insert( layer->id(), *s );
+  s2.xform = &mMapSettings->mapToPixel();
+
+  s2.fields = layer->pendingFields();
 
-  mActiveDiagramLayers[ layer->id()].renderer = layer->diagramRenderer()->clone();
+  s2.renderer = layer->diagramRenderer()->clone();
 
   return 1;
 }
@@ -3409,7 +3414,7 @@ void QgsPalLabeling::registerDiagramFeature( const QString& layerID, QgsFeature&
     }
 
     //append the diagram attributes to lbl
-    lbl->setDiagramAttributes( feat.attributes(), feat.fields() );
+    lbl->setDiagramAttributes( feat.attributes() );
   }
 
   //  feature to the layer
@@ -3934,6 +3939,7 @@ void QgsPalLabeling::drawLabeling( QgsRenderContext& context )
       {
         if ( QString( dit.key() + "d" ) == layerName )
         {
+          feature.setFields( &dit.value().fields );
           palGeometry->feature( feature );
           QgsPoint outPt = xform.transform(( *it )->getX(), ( *it )->getY() );
           dit.value().renderer->renderDiagram( feature, context, QPointF( outPt.x(), outPt.y() ) );

src/core/qgspallabeling.h

@@ -744,7 +744,7 @@ class CORE_EXPORT QgsPalLabeling : public QgsLabelingEngineInterface
     //! hook called when drawing layer before issuing select()
     virtual int prepareLayer( QgsVectorLayer* layer, QStringList &attrNames, QgsRenderContext& ctx );
     //! adds a diagram layer to the labeling engine
-    virtual int addDiagramLayer( QgsVectorLayer* layer, QgsDiagramLayerSettings *s );
+    virtual int addDiagramLayer( QgsVectorLayer* layer, const QgsDiagramLayerSettings *s );
     //! hook called when drawing for every feature in a layer
     virtual void registerFeature( const QString& layerID, QgsFeature& feat, const QgsRenderContext& context = QgsRenderContext() );
     virtual void registerDiagramFeature( const QString& layerID, QgsFeature& feat, const QgsRenderContext& context = QgsRenderContext() );

src/core/qgsvectorlayerrenderer.cpp

@@ -445,16 +445,17 @@ void QgsVectorLayerRenderer::prepareDiagrams( QgsVectorLayer* layer, QStringList
 
   mDiagrams = true;
 
-  QgsDiagramLayerSettings diagSettings = *layer->diagramLayerSettings();
+  const QgsDiagramRendererV2* diagRenderer = layer->diagramRenderer();
+  const QgsDiagramLayerSettings* diagSettings = layer->diagramLayerSettings();
 
-  mContext.labelingEngine()->addDiagramLayer( layer, &diagSettings );
+  mContext.labelingEngine()->addDiagramLayer( layer, diagSettings ); // will make internal copy of diagSettings + initialize it
 
   //add attributes needed by the diagram renderer
-  QList<QString> att = layer->diagramRenderer()->diagramAttributes();
+  QList<QString> att = diagRenderer->diagramAttributes();
   QList<QString>::const_iterator attIt = att.constBegin();
   for ( ; attIt != att.constEnd(); ++attIt )
   {
-    QgsExpression* expression = layer->diagramRenderer()->diagram()->getExpression( *attIt, &mFields );
+    QgsExpression* expression = diagRenderer->diagram()->getExpression( *attIt, &mFields );
     QStringList columns = expression->referencedColumns();
     QStringList::const_iterator columnsIterator = columns.constBegin();
     for ( ; columnsIterator != columns.constEnd(); ++columnsIterator )
@@ -469,7 +470,7 @@ void QgsVectorLayerRenderer::prepareDiagrams( QgsVectorLayer* layer, QStringList
   {
     if ( linearlyInterpolatedDiagramRenderer->classificationAttributeIsExpression() )
     {
-      QgsExpression* expression = layer->diagramRenderer()->diagram()->getExpression( linearlyInterpolatedDiagramRenderer->classificationAttributeExpression(), &mFields );
+      QgsExpression* expression = diagRenderer->diagram()->getExpression( linearlyInterpolatedDiagramRenderer->classificationAttributeExpression(), &mFields );
       QStringList columns = expression->referencedColumns();
       QStringList::const_iterator columnsIterator = columns.constBegin();
       for ( ; columnsIterator != columns.constEnd(); ++columnsIterator )
@@ -487,8 +488,8 @@ void QgsVectorLayerRenderer::prepareDiagrams( QgsVectorLayer* layer, QStringList
   }
 
   //and the ones needed for data defined diagram positions
-  if ( diagSettings.xPosColumn != -1 )
-    attributeNames << mFields.at( diagSettings.xPosColumn ).name();
-  if ( diagSettings.yPosColumn != -1 )
-    attributeNames << mFields.at( diagSettings.yPosColumn ).name();
+  if ( diagSettings->xPosColumn != -1 )
+    attributeNames << mFields.at( diagSettings->xPosColumn ).name();
+  if ( diagSettings->yPosColumn != -1 )
+    attributeNames << mFields.at( diagSettings->yPosColumn ).name();
 }