fix getLegendGraphics when BBox parameter is used

src/server/qgswmsserver.cpp

@@ -849,8 +849,6 @@ QImage* QgsWMSServer::getLegendGraphics()
   }
   QgsLayerTreeModel legendModel( &rootGroup );
 
-  QList<QgsLayerTreeNode*> rootChildren = rootGroup.children();
-
   if ( scaleDenominator > 0 )
     legendModel.setLegendFilterByScale( scaleDenominator );
 
@@ -890,7 +888,7 @@ QImage* QgsWMSServer::getLegendGraphics()
   }
 
   // find out DPI
-  QImage* tmpImage = createImage( 1, 1 );
+  QImage* tmpImage = createImage( 1, 1, false );
   if ( !tmpImage )
     return nullptr;
   qreal dpmm = tmpImage->dotsPerMeterX() / 1000.0;
@@ -920,7 +918,7 @@ QImage* QgsWMSServer::getLegendGraphics()
   if ( !rule.isEmpty() )
   {
     //create second image with the right dimensions
-    QImage* paintImage = createImage( ruleSymbolWidth, ruleSymbolHeight );
+    QImage* paintImage = createImage( ruleSymbolWidth, ruleSymbolHeight, false );
 
     //go through the items a second time for painting
     QPainter p( paintImage );
@@ -942,6 +940,7 @@ QImage* QgsWMSServer::getLegendGraphics()
     return paintImage;
   }
 
+  QList<QgsLayerTreeNode*> rootChildren = rootGroup.children();
   Q_FOREACH ( QgsLayerTreeNode* node, rootChildren )
   {
     if ( QgsLayerTree::isLayer( node ) )
@@ -981,7 +980,7 @@ QImage* QgsWMSServer::getLegendGraphics()
   QSizeF minSize = legendRenderer.minimumSize();
   QSize s( minSize.width() * dpmm, minSize.height() * dpmm );
 
-  QImage* paintImage = createImage( s.width(), s.height() );
+  QImage* paintImage = createImage( s.width(), s.height(), false );
 
   QPainter p( paintImage );
   p.setRenderHint( QPainter::Antialiasing, true );
@@ -1973,7 +1972,7 @@ QImage* QgsWMSServer::initializeRendering( QStringList& layersList, QStringList&
   return theImage;
 }
 
-QImage* QgsWMSServer::createImage( int width, int height ) const
+QImage* QgsWMSServer::createImage( int width, int height, bool useBbox ) const
 {
   bool conversionSuccess;
 
@@ -1995,23 +1994,26 @@ QImage* QgsWMSServer::createImage( int width, int height ) const
 
   //Adapt width / height if the aspect ratio does not correspond with the BBOX.
   //Required by WMS spec. 1.3.
-  bool bboxOk;
-  QgsRectangle mapExtent = _parseBBOX( mParameters.value( "BBOX" ), bboxOk );
-  if ( bboxOk )
+  if ( useBbox )
   {
-    double mapWidthHeightRatio = mapExtent.width() / mapExtent.height();
-    double imageWidthHeightRatio = ( double )width / ( double )height;
-    if ( !qgsDoubleNear( mapWidthHeightRatio, imageWidthHeightRatio, 0.0001 ) )
+    bool bboxOk;
+    QgsRectangle mapExtent = _parseBBOX( mParameters.value( "BBOX" ), bboxOk );
+    if ( bboxOk )
     {
-      if ( mapWidthHeightRatio >= imageWidthHeightRatio )
+      double mapWidthHeightRatio = mapExtent.width() / mapExtent.height();
+      double imageWidthHeightRatio = ( double )width / ( double )height;
+      if ( !qgsDoubleNear( mapWidthHeightRatio, imageWidthHeightRatio, 0.0001 ) )
       {
-        //decrease image height
-        height = width / mapWidthHeightRatio;
-      }
-      else
-      {
-        //decrease image width
-        width = height * mapWidthHeightRatio;
+        if ( mapWidthHeightRatio >= imageWidthHeightRatio )
+        {
+          //decrease image height
+          height = width / mapWidthHeightRatio;
+        }
+        else
+        {
+          //decrease image width
+          width = height * mapWidthHeightRatio;
+        }
       }
     }
   }

src/server/qgswmsserver.h

@@ -133,9 +133,11 @@ class QgsWMSServer: public QgsOWSServer
     /** Creates a QImage from the HEIGHT and WIDTH parameters
      @param width image width (or -1 if width should be taken from WIDTH wms parameter)
      @param height image height (or -1 if height should be taken from HEIGHT wms parameter)
+     @param useBbox flag to indicate if the BBOX has to be used to adapt aspect ratio
      @return 0 in case of error*/
-    QImage* createImage( int width = -1, int height = -1 ) const;
-    /** Configures mMapRenderer to the parameters
+    QImage* createImage( int width = -1, int height = -1, bool useBbox = true ) const;
+
+    /** Configures mapSettings to the parameters
      HEIGHT, WIDTH, BBOX, CRS.
      @param paintDevice the device that is used for painting (for dpi)
      @return 0 in case of success*/

tests/src/python/test_qgsserver.py

@@ -35,6 +35,10 @@ class TestQgsServer(unittest.TestCase):
     def setUp(self):
         """Create the server instance"""
         self.testdata_path = unitTestDataPath('qgis_server') + '/'
+
+        d = unitTestDataPath('qgis_server_accesscontrol') + '/'
+        self.projectPath = os.path.join(d, "project.qgs")
+
         # Clean env just to be sure
         env_vars = ['QUERY_STRING', 'QGIS_PROJECT_FILE']
         for ev in env_vars:
@@ -407,6 +411,132 @@ def test_getLegendGraphics_layertitle(self):
         r, h = self._result(self.server.handleRequest(qs))
         self._img_diff_error(r, h, "WMS_GetLegendGraphic_test_layertitle_false", 250, QSize(10, 10))
 
+    def test_wms_GetLegendGraphic_Basic(self):
+        qs = "&".join(["%s=%s" % i for i in list({
+            "MAP": urllib.quote(self.projectPath),
+            "SERVICE": "WMS",
+            "VERSION": "1.1.1",
+            "REQUEST": "GetLegendGraphic",
+            "LAYER": "Country,Hello",
+            "LAYERTITLE": "FALSE",
+            "FORMAT": "image/png",
+            "HEIGHT": "500",
+            "WIDTH": "500",
+            "CRS": "EPSG:3857"
+        }.items())])
+
+        r, h = self._result(self.server.handleRequest(qs))
+        self._img_diff_error(r, h, "WMS_GetLegendGraphic_Basic")
+
+    def test_wms_GetLegendGraphic_BoxSpace(self):
+        qs = "&".join(["%s=%s" % i for i in list({
+            "MAP": urllib.quote(self.projectPath),
+            "SERVICE": "WMS",
+            "VERSION": "1.1.1",
+            "REQUEST": "GetLegendGraphic",
+            "LAYER": "Country,Hello",
+            "LAYERTITLE": "FALSE",
+            "BOXSPACE": "100",
+            "FORMAT": "image/png",
+            "HEIGHT": "500",
+            "WIDTH": "500",
+            "CRS": "EPSG:3857"
+        }.items())])
+
+        r, h = self._result(self.server.handleRequest(qs))
+        self._img_diff_error(r, h, "WMS_GetLegendGraphic_BoxSpace")
+
+    def test_wms_GetLegendGraphic_SymbolSpace(self):
+        qs = "&".join(["%s=%s" % i for i in list({
+            "MAP": urllib.quote(self.projectPath),
+            "SERVICE": "WMS",
+            "VERSION": "1.1.1",
+            "REQUEST": "GetLegendGraphic",
+            "LAYER": "Country,Hello",
+            "LAYERTITLE": "FALSE",
+            "SYMBOLSPACE": "100",
+            "FORMAT": "image/png",
+            "HEIGHT": "500",
+            "WIDTH": "500",
+            "CRS": "EPSG:3857"
+        }.items())])
+
+        r, h = self._result(self.server.handleRequest(qs))
+        self._img_diff_error(r, h, "WMS_GetLegendGraphic_SymbolSpace")
+
+    def test_wms_GetLegendGraphic_IconLabelSpace(self):
+        qs = "&".join(["%s=%s" % i for i in list({
+            "MAP": urllib.quote(self.projectPath),
+            "SERVICE": "WMS",
+            "VERSION": "1.1.1",
+            "REQUEST": "GetLegendGraphic",
+            "LAYER": "Country,Hello",
+            "LAYERTITLE": "FALSE",
+            "ICONLABELSPACE": "100",
+            "FORMAT": "image/png",
+            "HEIGHT": "500",
+            "WIDTH": "500",
+            "CRS": "EPSG:3857"
+        }.items())])
+
+        r, h = self._result(self.server.handleRequest(qs))
+        self._img_diff_error(r, h, "WMS_GetLegendGraphic_IconLabelSpace")
+
+    def test_wms_GetLegendGraphic_SymbolSize(self):
+        qs = "&".join(["%s=%s" % i for i in list({
+            "MAP": urllib.quote(self.projectPath),
+            "SERVICE": "WMS",
+            "VERSION": "1.1.1",
+            "REQUEST": "GetLegendGraphic",
+            "LAYER": "Country,Hello",
+            "LAYERTITLE": "FALSE",
+            "SYMBOLWIDTH": "50",
+            "SYMBOLHEIGHT": "30",
+            "FORMAT": "image/png",
+            "HEIGHT": "500",
+            "WIDTH": "500",
+            "CRS": "EPSG:3857"
+        }.items())])
+
+        r, h = self._result(self.server.handleRequest(qs))
+        self._img_diff_error(r, h, "WMS_GetLegendGraphic_SymbolSize")
+
+    def test_wms_GetLegendGraphic_BBox(self):
+        qs = "&".join(["%s=%s" % i for i in list({
+            "MAP": urllib.quote(self.projectPath),
+            "SERVICE": "WMS",
+            "VERSION": "1.1.1",
+            "REQUEST": "GetLegendGraphic",
+            "LAYER": "Country,Hello,db_point",
+            "LAYERTITLE": "FALSE",
+            "FORMAT": "image/png",
+            "HEIGHT": "500",
+            "WIDTH": "500",
+            "BBOX": "-151.7,-38.9,51.0,78.0",
+            "CRS": "EPSG:4326"
+        }.items())])
+
+        r, h = self._result(self.server.handleRequest(qs))
+        self._img_diff_error(r, h, "WMS_GetLegendGraphic_BBox")
+
+    def test_wms_GetLegendGraphic_BBox2(self):
+        qs = "&".join(["%s=%s" % i for i in list({
+            "MAP": urllib.quote(self.projectPath),
+            "SERVICE": "WMS",
+            "VERSION": "1.1.1",
+            "REQUEST": "GetLegendGraphic",
+            "LAYER": "Country,Hello,db_point",
+            "LAYERTITLE": "FALSE",
+            "FORMAT": "image/png",
+            "HEIGHT": "500",
+            "WIDTH": "500",
+            "BBOX": "-76.08,-6.4,-19.38,38.04",
+            "SRS": "EPSG:4326"
+        }.items())])
+
+        r, h = self._result(self.server.handleRequest(qs))
+        self._img_diff_error(r, h, "WMS_GetLegendGraphic_BBox2")
+
     def _result(self, data):
         headers = {}
         for line in data[0].decode('UTF-8').split("\n"):