Update getLegendGraphics with render context

Author: pblottiere

src/server/services/wms/qgswmsgetlegendgraphics.cpp

@@ -26,19 +26,20 @@
 
 namespace QgsWms
 {
-
   void writeGetLegendGraphics( QgsServerInterface *serverIface, const QgsProject *project,
-                               const QString &version, const QgsServerRequest &request,
+                               const QString &, const QgsServerRequest &request,
                                QgsServerResponse &response )
   {
-    Q_UNUSED( version );
-
-    QgsServerRequest::Parameters params = request.parameters();
-    QString format = params.value( QStringLiteral( "FORMAT" ), QStringLiteral( "PNG" ) );
+    // get parameters from query
+    QgsWmsParameters parameters( QUrlQuery( request.url() ) );
 
-    QgsWmsParameters wmsParameters( QUrlQuery( request.url() ) );
+    // init render context
+    QgsWmsRenderContext context( project, serverIface );
+    context.setFlag( QgsWmsRenderContext::UseScaleDenominator );
+    context.setParameters( parameters );
 
     // Get cached image
+    const QString format = request.parameters().value( QStringLiteral( "FORMAT" ), QStringLiteral( "PNG" ) );
     QgsAccessControl *accessControl = nullptr;
     QgsServerCacheManager *cacheManager = nullptr;
 #ifdef HAVE_SERVER_PYTHON_PLUGINS
@@ -79,8 +80,7 @@ namespace QgsWms
       }
     }
 
-    QgsRenderer renderer( serverIface, project, wmsParameters );
-
+    QgsRenderer renderer( context );
     std::unique_ptr<QImage> result( renderer.getLegendGraphics() );
 
     if ( result )
@@ -99,10 +99,4 @@ namespace QgsWms
                                  QStringLiteral( "Failed to compute GetLegendGraphics image" ) );
     }
   }
-
-
 } // namespace QgsWms
-
-
-
-

src/server/services/wms/qgswmsrenderer.cpp

@@ -163,36 +163,19 @@ namespace QgsWms
       throw QgsBadRequestException( QStringLiteral( "FormatNotSpecified" ),
                                     QStringLiteral( "FORMAT is mandatory for GetLegendGraphic operation" ) );
 
-    double scaleDenominator = -1;
-    if ( ! mWmsParameters.scale().isEmpty() )
-      scaleDenominator = mWmsParameters.scaleAsDouble();
-
-    QgsLegendSettings legendSettings = mWmsParameters.legendSettings();
-
     // get layers
     std::unique_ptr<QgsLayerRestorer> restorer;
-    restorer.reset( new QgsLayerRestorer( mNicknameLayers.values() ) );
-
-    QList<QgsMapLayer *> layers;
-    QList<QgsWmsParametersLayer> params = mWmsParameters.layersParameters();
-
-    QString sld = mWmsParameters.sldBody();
-    if ( !sld.isEmpty() )
-      layers = sldStylizedLayers( sld );
-    else
-      layers = stylizedLayers( params );
-
-    removeUnwantedLayers( layers, scaleDenominator );
-    std::reverse( layers.begin(), layers.end() );
+    restorer.reset( new QgsLayerRestorer( mContext.layers() ) );
 
-    // check permissions
-    for ( QgsMapLayer *ml : layers )
-      checkLayerReadPermissions( ml );
+    // configure layers
+    QList<QgsMapLayer *> layers = mContext.layersToRender();
+    configureLayers( layers );
 
     // build layer tree model for legend
     QgsLayerTree rootGroup;
+    QgsLegendSettings legendSettings = mContext.parameters().legendSettings();
     std::unique_ptr<QgsLayerTreeModel> legendModel;
-    legendModel.reset( buildLegendTreeModel( layers, scaleDenominator, rootGroup ) );
+    legendModel.reset( buildLegendTreeModel( layers, mContext.scaleDenominator(), rootGroup ) );
 
     // rendering step
     qreal dpmm = dotsPerMm();