Fix dxf export for label layers and add unit test

Author: mhugent

src/core/dxf/qgsdxfexport.cpp

@@ -1071,12 +1071,9 @@ void QgsDxfExport::writeEntities()
       else
       {
         QgsSymbolList symbolList = renderer->symbolsForFeature( fet, ctx );
-        if ( symbolList.empty() )
-        {
-          continue;
-        }
+        bool hasSymbology = symbolList.size() > 0;
 
-        if ( mSymbologyExport == QgsDxfExport::SymbolLayerSymbology ) // symbol layer symbology, but layer does not use symbol levels
+        if ( hasSymbology && mSymbologyExport == QgsDxfExport::SymbolLayerSymbology ) // symbol layer symbology, but layer does not use symbol levels
         {
           QgsSymbolList::iterator symbolIt = symbolList.begin();
           for ( ; symbolIt != symbolList.end(); ++symbolIt )
@@ -1088,7 +1085,7 @@ void QgsDxfExport::writeEntities()
             }
           }
         }
-        else
+        else if ( hasSymbology )
         {
           // take first symbollayer from first symbol
           QgsSymbol *s = symbolList.first();

tests/src/core/testqgsdxfexport.cpp

@@ -20,6 +20,7 @@
 #include "qgsproject.h"
 #include "qgsvectorlayer.h"
 #include "qgsfontutils.h"
+#include "qgsnullsymbolrenderer.h"
 #include "qgstextrenderer.h"
 #include "qgspallabeling.h"
 #include "qgslabelingengine.h"
@@ -41,10 +42,12 @@ class TestQgsDxfExport : public QObject
     void testLines();
     void testPolygons();
     void testMtext();
+    void testMTextNoSymbology(); //tests if label export works if layer has vector renderer type 'no symbols'
     void testText();
 
   private:
     QgsVectorLayer *mPointLayer = nullptr;
+    QgsVectorLayer *mPointLayerNoSymbols = nullptr;
     QgsVectorLayer *mLineLayer = nullptr;
     QgsVectorLayer *mPolygonLayer = nullptr;
 
@@ -54,6 +57,7 @@ class TestQgsDxfExport : public QObject
     QString getTempFileName( const QString &file ) const;
 
     bool fileContainsText( const QString &path, const QString &text ) const;
+    bool testMtext( QgsVectorLayer *vlayer, const QString &tempFileName ) const;
 };
 
 void TestQgsDxfExport::initTestCase()
@@ -75,6 +79,10 @@ void TestQgsDxfExport::init()
   mPointLayer = new QgsVectorLayer( filename, QStringLiteral( "points" ), QStringLiteral( "ogr" ) );
   QVERIFY( mPointLayer->isValid() );
   QgsProject::instance()->addMapLayer( mPointLayer );
+  mPointLayerNoSymbols = new QgsVectorLayer( filename, QStringLiteral( "points" ), QStringLiteral( "ogr" ) );
+  QVERIFY( mPointLayerNoSymbols->isValid() );
+  mPointLayerNoSymbols->setRenderer( new QgsNullSymbolRenderer() );
+  QgsProject::instance()->addMapLayer( mPointLayerNoSymbols );
   filename = QStringLiteral( TEST_DATA_DIR ) + "/lines.shp";
   mLineLayer = new QgsVectorLayer( filename, QStringLiteral( "lines" ), QStringLiteral( "ogr" ) );
   QVERIFY( mLineLayer->isValid() );
@@ -176,6 +184,16 @@ void TestQgsDxfExport::testPolygons()
 }
 
 void TestQgsDxfExport::testMtext()
+{
+  QVERIFY( testMtext( mPointLayer, QStringLiteral( "mtext_dxf" ) ) );
+}
+
+void TestQgsDxfExport::testMTextNoSymbology()
+{
+  QVERIFY( testMtext( mPointLayerNoSymbols, QStringLiteral( "text_no_symbology_dxf" ) ) );
+}
+
+void TestQgsDxfExport::testText()
 {
   QgsPalLayerSettings settings;
   settings.fieldName = QStringLiteral( "Class" );
@@ -202,20 +220,21 @@ void TestQgsDxfExport::testMtext()
   d.setMapSettings( mapSettings );
   d.setSymbologyScale( 1000 );
   d.setSymbologyExport( QgsDxfExport::FeatureSymbology );
+  d.setFlags( QgsDxfExport::FlagNoMText );
 
-  QString file = getTempFileName( "mtext_dxf" );
+  QString file = getTempFileName( "text_dxf" );
   QFile dxfFile( file );
   QCOMPARE( d.writeToFile( &dxfFile, QStringLiteral( "CP1252" ) ), 0 );
   dxfFile.close();
 
 
-  QVERIFY( fileContainsText( file, "MTEXT\n"
+  QVERIFY( fileContainsText( file, "TEXT\n"
                              "  5\n"
                              "dd\n"
                              "100\n"
                              "AcDbEntity\n"
                              "100\n"
-                             "AcDbMText\n"
+                             "AcDbText\n"
                              "  8\n"
                              "points\n"
                              "420\n"
@@ -224,21 +243,25 @@ void TestQgsDxfExport::testMtext()
                              "**no check**\n"
                              " 20\n"
                              "**no check**\n"
+                             " 40\n"
+                             "**no check**\n"
                              "  1\n"
-                             "\\fQGIS Vera Sans|i0|b1;\\H3.81136;Biplane\n"
+                             "Biplane\n"
                              " 50\n"
                              "0.0\n"
-                             " 41\n"
-                             "**no check**\n"
-                             " 71\n"
-                             "     7\n"
                              "  7\n"
                              "STANDARD\n"
-                             "  0" ) );
+                             "100\n"
+                             "AcDbText" ) );
 }
 
-void TestQgsDxfExport::testText()
+bool TestQgsDxfExport::testMtext( QgsVectorLayer *vlayer, const QString &tempFileName ) const
 {
+  if ( !vlayer )
+  {
+    return false;
+  }
+
   QgsPalLayerSettings settings;
   settings.fieldName = QStringLiteral( "Class" );
   QgsTextFormat format;
@@ -247,38 +270,40 @@ void TestQgsDxfExport::testText()
   format.setNamedStyle( QStringLiteral( "Bold" ) );
   format.setColor( QColor( 200, 0, 200 ) );
   settings.setFormat( format );
-  mPointLayer->setLabeling( new QgsVectorLayerSimpleLabeling( settings ) );
-  mPointLayer->setLabelsEnabled( true );
+  vlayer->setLabeling( new QgsVectorLayerSimpleLabeling( settings ) );
+  vlayer->setLabelsEnabled( true );
 
   QgsDxfExport d;
-  d.addLayers( QList< QPair< QgsVectorLayer *, int > >() << qMakePair( mPointLayer, -1 ) );
+  d.addLayers( QList< QPair< QgsVectorLayer *, int > >() << qMakePair( vlayer, -1 ) );
 
   QgsMapSettings mapSettings;
   QSize size( 640, 480 );
   mapSettings.setOutputSize( size );
-  mapSettings.setExtent( mPointLayer->extent() );
-  mapSettings.setLayers( QList<QgsMapLayer *>() << mPointLayer );
+  mapSettings.setExtent( vlayer->extent() );
+  mapSettings.setLayers( QList<QgsMapLayer *>() << vlayer );
   mapSettings.setOutputDpi( 96 );
-  mapSettings.setDestinationCrs( mPointLayer->crs() );
+  mapSettings.setDestinationCrs( vlayer->crs() );
 
   d.setMapSettings( mapSettings );
   d.setSymbologyScale( 1000 );
   d.setSymbologyExport( QgsDxfExport::FeatureSymbology );
-  d.setFlags( QgsDxfExport::FlagNoMText );
 
-  QString file = getTempFileName( "text_dxf" );
+  QString file = getTempFileName( tempFileName );
   QFile dxfFile( file );
-  QCOMPARE( d.writeToFile( &dxfFile, QStringLiteral( "CP1252" ) ), 0 );
+  if ( !d.writeToFile( &dxfFile, QStringLiteral( "CP1252" ) ) == 0 )
+  {
+    return false;
+  }
   dxfFile.close();
 
 
-  QVERIFY( fileContainsText( file, "TEXT\n"
+  return ( fileContainsText( file, "MTEXT\n"
                              "  5\n"
-                             "dd\n"
+                             "**no check**\n"
                              "100\n"
                              "AcDbEntity\n"
                              "100\n"
-                             "AcDbText\n"
+                             "AcDbMText\n"
                              "  8\n"
                              "points\n"
                              "420\n"
@@ -287,16 +312,17 @@ void TestQgsDxfExport::testText()
                              "**no check**\n"
                              " 20\n"
                              "**no check**\n"
-                             " 40\n"
-                             "**no check**\n"
                              "  1\n"
-                             "Biplane\n"
+                             "\\fQGIS Vera Sans|i0|b1;\\H3.81136;Biplane\n"
                              " 50\n"
                              "0.0\n"
+                             " 41\n"
+                             "**no check**\n"
+                             " 71\n"
+                             "     7\n"
                              "  7\n"
                              "STANDARD\n"
-                             "100\n"
-                             "AcDbText" ) );
+                             "  0" ) );
 }
 
 bool TestQgsDxfExport::fileContainsText( const QString &path, const QString &text ) const