Fixes qgis#54926 : Correct masking with SVG symbol

src/core/qgsmaskpaintdevice.cpp

@@ -34,18 +34,17 @@ QPainterPath QgsMaskPaintEngine::maskPainterPath() const
 
 void QgsMaskPaintEngine::drawPath( const QPainterPath &path )
 {
+  QPainterPath realPath = path;
   if ( mUsePathStroker )
   {
     QPen pen = painter()->pen();
     QPainterPathStroker stroker( pen );
     QPainterPath strokedPath = stroker.createStroke( path );
-    strokedPath = painter()->combinedTransform().map( strokedPath );
-    mMaskPainterPath.addPath( strokedPath );
-  }
-  else
-  {
-    mMaskPainterPath.addPath( path );
+    realPath = strokedPath;
   }
+
+  const QTransform transform = painter()->combinedTransform();
+  mMaskPainterPath.addPath( transform.map( realPath ) );
 }
 
 void QgsMaskPaintEngine::drawPolygon( const QPointF *points, int numPoints, QPaintEngine::PolygonDrawMode mode )
@@ -56,7 +55,9 @@ void QgsMaskPaintEngine::drawPolygon( const QPointF *points, int numPoints, QPai
   polygon.reserve( numPoints );
   for ( int i = 0; i < numPoints; ++i )
     polygon << points[i];
-  mMaskPainterPath.addPolygon( polygon );
+
+  const QTransform transform = painter()->transform();
+  mMaskPainterPath.addPolygon( transform.map( polygon ) );
 }
 
 ///@endcond

tests/src/python/test_selective_masking.py

@@ -35,12 +35,14 @@
     QgsMaskMarkerSymbolLayer,
     QgsOuterGlowEffect,
     QgsPalLayerSettings,
+    QgsPathResolver,
     QgsProject,
     QgsProjectFileTransform,
     QgsProperty,
     QgsRectangle,
     QgsRenderContext,
     QgsSingleSymbolRenderer,
+    QgsSvgMarkerSymbolLayer,
     QgsSymbolLayerId,
     QgsSymbolLayerReference,
     QgsSymbolLayerUtils,
@@ -1315,6 +1317,34 @@ def test_vector_random_generator_fill(self):
 
         self.check_layout_export("layout_export_random_generator_fill", 0, [layer], extent=extent)
 
+    def test_layout_export_svg_marker_masking(self):
+        """Test layout export with a svg marker symbol masking"""
+
+        svgPath = QgsSymbolLayerUtils.svgSymbolNameToPath('gpsicons/plane.svg', QgsPathResolver())
+
+        sl = QgsSvgMarkerSymbolLayer(svgPath, 5)
+        sl.setFillColor(QColor("blue"))
+
+        p = QgsMarkerSymbol()
+        p.changeSymbolLayer(0, sl)
+
+        self.points_layer.setRenderer(QgsSingleSymbolRenderer(p))
+
+        mask_layer = QgsMaskMarkerSymbolLayer()
+        maskSl = QgsSvgMarkerSymbolLayer(svgPath, 8)
+        pSl = QgsMarkerSymbol()
+        pSl.changeSymbolLayer(0, maskSl)
+        mask_layer.setSubSymbol(pSl)
+        mask_layer.setMasks([
+            # the black part of roads
+            self.get_symbollayer_ref(self.lines_layer, "", [0]),
+        ])
+        # add this mask layer to the point layer
+        self.points_layer.renderer().symbol().appendSymbolLayer(mask_layer)
+
+        # no rasters
+        self.check_layout_export("layout_export_svg_marker_masking", 0, [self.points_layer, self.lines_layer])
+
 
 if __name__ == '__main__':
     start_app()