Merge pull request #42084 from mhugent/server_fix_external_wms_opacities

Server: Opacity should also be considered for external layers

src/server/services/wms/qgswmsparameters.cpp

@@ -1576,6 +1576,9 @@ namespace QgsWms
       QgsWmsParametersLayer param;
       param.mNickname = layer;
 
+      if ( i < opacities.count() )
+        param.mOpacity = opacities[i];
+
       if ( isExternalLayer( layer ) )
       {
         const QgsWmsParametersExternalLayer extParam = externalLayerParameter( layer );
@@ -1587,9 +1590,6 @@ namespace QgsWms
         if ( i < styles.count() )
           param.mStyle = styles[i];
 
-        if ( i < opacities.count() )
-          param.mOpacity = opacities[i];
-
         if ( filters.contains( layer ) )
         {
           auto it = filters.find( layer );

src/server/services/wms/qgswmsrenderer.cpp

@@ -3287,6 +3287,10 @@ namespace QgsWms
 
       if ( mContext.isExternalLayer( param.mNickname ) )
       {
+        if ( mContext.testFlag( QgsWmsRenderContext::UseOpacity ) )
+        {
+          setLayerOpacity( layer, param.mOpacity );
+        }
         continue;
       }
 

tests/src/server/wms/test_qgsserver_wms_parameters.cpp

@@ -53,6 +53,8 @@ void TestQgsServerWmsParameters::external_layers()
   query.addQueryItem( "external_layer_1:layers", "layer_1_name" );
   query.addQueryItem( "external_layer_2:url", "http://url_2" );
   query.addQueryItem( "external_layer_2:layers", "layer_2_name" );
+  query.addQueryItem( "external_layer_2:opacities", "100" );
+  query.addQueryItem( "OPACITIES", "255,200,125" );
 
   QgsWms::QgsWmsParameters parameters( query );
 
@@ -68,7 +70,12 @@ void TestQgsServerWmsParameters::external_layers()
 
   layer_params = layers_params[2];
   QCOMPARE( layer_params.mNickname, QString( "external_layer_2" ) );
-  QCOMPARE( layer_params.mExternalUri, QString( "layers=layer_2_name&url=http://url_2" ) );
+  QCOMPARE( layer_params.mExternalUri, QString( "layers=layer_2_name&opacities=100&url=http://url_2" ) );
+
+  //test if opacities are also applied to external layers
+  QCOMPARE( layers_params[0].mOpacity, 255 );
+  QCOMPARE( layers_params[1].mOpacity, 200 );
+  QCOMPARE( layers_params[2].mOpacity, 125 );
 }
 
 void TestQgsServerWmsParameters::percent_encoding()