Fix clipped render when using geometry generator symbol in layout items

python/PyQt6/core/auto_additions/qgis.py

@@ -4772,6 +4772,9 @@
 QgsRenderContext.AlwaysUseGlobalMasks = Qgis.RenderContextFlag.AlwaysUseGlobalMasks
 QgsRenderContext.AlwaysUseGlobalMasks.is_monkey_patched = True
 QgsRenderContext.AlwaysUseGlobalMasks.__doc__ = "When applying clipping paths for selective masking, always use global (\"entire map\") paths, instead of calculating local clipping paths per rendered feature. This results in considerably more complex vector exports in all current Qt versions. This flag only applies to vector map exports. \n.. versionadded:: 3.38"
+QgsRenderContext.DisableSymbolClippingToExtent = Qgis.RenderContextFlag.DisableSymbolClippingToExtent
+QgsRenderContext.DisableSymbolClippingToExtent.is_monkey_patched = True
+QgsRenderContext.DisableSymbolClippingToExtent.__doc__ = "Force symbol clipping to map extent to be disabled in all situations. This will result in slower rendering, and should only be used in situations where the feature clipping is always undesirable. \n.. versionadded:: 3.40"
 Qgis.RenderContextFlag.__doc__ = """Flags which affect rendering operations.
 
 .. versionadded:: 3.22
@@ -4812,6 +4815,10 @@
 
   .. versionadded:: 3.38
 
+* ``DisableSymbolClippingToExtent``: Force symbol clipping to map extent to be disabled in all situations. This will result in slower rendering, and should only be used in situations where the feature clipping is always undesirable.
+
+  .. versionadded:: 3.40
+
 
 """
 # --

python/PyQt6/core/auto_generated/qgis.sip.in

@@ -1530,6 +1530,7 @@ The development version
       SkipSymbolRendering,
       RecordProfile,
       AlwaysUseGlobalMasks,
+      DisableSymbolClippingToExtent,
     };
     typedef QFlags<Qgis::RenderContextFlag> RenderContextFlags;
 

python/core/auto_additions/qgis.py

@@ -4724,6 +4724,9 @@
 QgsRenderContext.AlwaysUseGlobalMasks = Qgis.RenderContextFlag.AlwaysUseGlobalMasks
 QgsRenderContext.AlwaysUseGlobalMasks.is_monkey_patched = True
 QgsRenderContext.AlwaysUseGlobalMasks.__doc__ = "When applying clipping paths for selective masking, always use global (\"entire map\") paths, instead of calculating local clipping paths per rendered feature. This results in considerably more complex vector exports in all current Qt versions. This flag only applies to vector map exports. \n.. versionadded:: 3.38"
+QgsRenderContext.DisableSymbolClippingToExtent = Qgis.RenderContextFlag.DisableSymbolClippingToExtent
+QgsRenderContext.DisableSymbolClippingToExtent.is_monkey_patched = True
+QgsRenderContext.DisableSymbolClippingToExtent.__doc__ = "Force symbol clipping to map extent to be disabled in all situations. This will result in slower rendering, and should only be used in situations where the feature clipping is always undesirable. \n.. versionadded:: 3.40"
 Qgis.RenderContextFlag.__doc__ = """Flags which affect rendering operations.
 
 .. versionadded:: 3.22
@@ -4764,6 +4767,10 @@
 
   .. versionadded:: 3.38
 
+* ``DisableSymbolClippingToExtent``: Force symbol clipping to map extent to be disabled in all situations. This will result in slower rendering, and should only be used in situations where the feature clipping is always undesirable.
+
+  .. versionadded:: 3.40
+
 
 """
 # --

python/core/auto_generated/qgis.sip.in

@@ -1530,6 +1530,7 @@ The development version
       SkipSymbolRendering,
       RecordProfile,
       AlwaysUseGlobalMasks,
+      DisableSymbolClippingToExtent,
     };
     typedef QFlags<Qgis::RenderContextFlag> RenderContextFlags;
 

src/core/layout/qgslayoutitempolygon.cpp

@@ -136,18 +136,23 @@ QgsFillSymbol *QgsLayoutItemPolygon::symbol()
 
 void QgsLayoutItemPolygon::_draw( QgsLayoutItemRenderContext &context, const QStyleOptionGraphicsItem * )
 {
+  QgsRenderContext renderContext = context.renderContext();
+  // symbol clipping messes with geometry generators used in the symbol for this item, and has no
+  // valid use here. See https://github.com/qgis/QGIS/issues/58909
+  renderContext.setFlag( Qgis::RenderContextFlag::DisableSymbolClippingToExtent );
+
   //setup painter scaling to dots so that raster symbology is drawn to scale
-  const double scale = context.renderContext().convertToPainterUnits( 1, Qgis::RenderUnit::Millimeters );
+  const double scale = renderContext.convertToPainterUnits( 1, Qgis::RenderUnit::Millimeters );
   const QTransform t = QTransform::fromScale( scale, scale );
 
   const QVector<QPolygonF> rings; //empty
   QPainterPath polygonPath;
   polygonPath.addPolygon( mPolygon );
 
-  mPolygonStyleSymbol->startRender( context.renderContext() );
+  mPolygonStyleSymbol->startRender( renderContext );
   mPolygonStyleSymbol->renderPolygon( polygonPath.toFillPolygon( t ), &rings,
-                                      nullptr, context.renderContext() );
-  mPolygonStyleSymbol->stopRender( context.renderContext() );
+                                      nullptr, renderContext );
+  mPolygonStyleSymbol->stopRender( renderContext );
 }
 
 void QgsLayoutItemPolygon::_readXmlStyle( const QDomElement &elmt, const QgsReadWriteContext &context )

src/core/layout/qgslayoutitempolyline.cpp

@@ -280,20 +280,25 @@ QString QgsLayoutItemPolyline::displayName() const
 
 void QgsLayoutItemPolyline::_draw( QgsLayoutItemRenderContext &context, const QStyleOptionGraphicsItem * )
 {
-  const QgsScopedQPainterState painterState( context.renderContext().painter() );
+  QgsRenderContext renderContext = context.renderContext();
+  // symbol clipping messes with geometry generators used in the symbol for this item, and has no
+  // valid use here. See https://github.com/qgis/QGIS/issues/58909
+  renderContext.setFlag( Qgis::RenderContextFlag::DisableSymbolClippingToExtent );
+
+  const QgsScopedQPainterState painterState( renderContext.painter() );
   //setup painter scaling to dots so that raster symbology is drawn to scale
-  const double scale = context.renderContext().convertToPainterUnits( 1, Qgis::RenderUnit::Millimeters );
+  const double scale = renderContext.convertToPainterUnits( 1, Qgis::RenderUnit::Millimeters );
   const QTransform t = QTransform::fromScale( scale, scale );
 
-  mPolylineStyleSymbol->startRender( context.renderContext() );
-  mPolylineStyleSymbol->renderPolyline( t.map( mPolygon ), nullptr, context.renderContext() );
-  mPolylineStyleSymbol->stopRender( context.renderContext() );
+  mPolylineStyleSymbol->startRender( renderContext );
+  mPolylineStyleSymbol->renderPolyline( t.map( mPolygon ), nullptr, renderContext );
+  mPolylineStyleSymbol->stopRender( renderContext );
 
   // painter is scaled to dots, so scale back to layout units
-  context.renderContext().painter()->scale( context.renderContext().scaleFactor(), context.renderContext().scaleFactor() );
+  renderContext.painter()->scale( renderContext.scaleFactor(), renderContext.scaleFactor() );
 
-  drawStartMarker( context.renderContext().painter() );
-  drawEndMarker( context.renderContext().painter() );
+  drawStartMarker( renderContext.painter() );
+  drawEndMarker( renderContext.painter() );
 }
 
 void QgsLayoutItemPolyline::_readXmlStyle( const QDomElement &elmt, const QgsReadWriteContext &context )

src/core/layout/qgslayoutitemshape.cpp

@@ -196,17 +196,22 @@ bool QgsLayoutItemShape::accept( QgsStyleEntityVisitorInterface *visitor ) const
 
 void QgsLayoutItemShape::draw( QgsLayoutItemRenderContext &context )
 {
-  QPainter *painter = context.renderContext().painter();
+  QgsRenderContext renderContext = context.renderContext();
+  // symbol clipping messes with geometry generators used in the symbol for this item, and has no
+  // valid use here. See https://github.com/qgis/QGIS/issues/58909
+  renderContext.setFlag( Qgis::RenderContextFlag::DisableSymbolClippingToExtent );
+
+  QPainter *painter = renderContext.painter();
   painter->setPen( Qt::NoPen );
   painter->setBrush( Qt::NoBrush );
 
-  const double scale = context.renderContext().convertToPainterUnits( 1, Qgis::RenderUnit::Millimeters );
+  const double scale = renderContext.convertToPainterUnits( 1, Qgis::RenderUnit::Millimeters );
 
   const QVector<QPolygonF> rings; //empty list
 
-  symbol()->startRender( context.renderContext() );
-  symbol()->renderPolygon( calculatePolygon( scale ), &rings, nullptr, context.renderContext() );
-  symbol()->stopRender( context.renderContext() );
+  symbol()->startRender( renderContext );
+  symbol()->renderPolygon( calculatePolygon( scale ), &rings, nullptr, renderContext );
+  symbol()->stopRender( renderContext );
 }
 
 QPolygonF QgsLayoutItemShape::calculatePolygon( double scale ) const

src/core/qgis.h

@@ -2585,6 +2585,7 @@ class CORE_EXPORT Qgis
       SkipSymbolRendering      = 0x40000, //!< Disable symbol rendering while still drawing labels if enabled \since QGIS 3.24
       RecordProfile            = 0x80000, //!< Enable run-time profiling while rendering \since QGIS 3.34
       AlwaysUseGlobalMasks     = 0x100000, //!< When applying clipping paths for selective masking, always use global ("entire map") paths, instead of calculating local clipping paths per rendered feature. This results in considerably more complex vector exports in all current Qt versions. This flag only applies to vector map exports. \since QGIS 3.38
+      DisableSymbolClippingToExtent = 0x200000, //!< Force symbol clipping to map extent to be disabled in all situations. This will result in slower rendering, and should only be used in situations where the feature clipping is always undesirable. \since QGIS 3.40
     };
     //! Render context flags
     Q_DECLARE_FLAGS( RenderContextFlags, RenderContextFlag ) SIP_MONKEYPATCH_FLAGS_UNNEST( QgsRenderContext, Flags )

src/core/symbology/qgssymbol.cpp

@@ -1560,6 +1560,7 @@ void QgsSymbol::renderFeature( const QgsFeature &feature, QgsRenderContext &cont
       break;
     }
   }
+  clippingEnabled &= !context.testFlag( Qgis::RenderContextFlag::DisableSymbolClippingToExtent ) 
   if ( clippingEnabled && context.testFlag( Qgis::RenderContextFlag::RenderMapTile ) )
   {
     // If the "avoid artifacts between adjacent tiles" flag is set (RenderMapTile), then we'll force disable

tests/src/python/test_qgslayoutpolygon.py

@@ -22,7 +22,11 @@
     QgsLayoutItemRenderContext,
     QgsLayoutUtils,
     QgsProject,
-    QgsReadWriteContext
+    QgsReadWriteContext,
+    QgsLayoutItemMap,
+    QgsRectangle,
+    Qgis,
+    QgsGeometryGeneratorSymbolLayer
 )
 import unittest
 from qgis.testing import start_app, QgisTestCase
@@ -373,6 +377,51 @@ def testClipPath(self):
         p.end()
         self.assertEqual(len(spy), 5)
 
+    def test_generator(self):
+        project = QgsProject()
+        layout = QgsLayout(project)
+        layout.initializeDefaults()
+
+        p = QPolygonF()
+        p.append(QPointF(0.0, 0.0))
+        p.append(QPointF(100.0, 10.0))
+        p.append(QPointF(200.0, 100.0))
+        shape = QgsLayoutItemPolygon(p, layout)
+        layout.addLayoutItem(shape)
+
+        map = QgsLayoutItemMap(layout)
+        map.attemptSetSceneRect(QRectF(0, 0, 10, 10))
+        map.zoomToExtent(QgsRectangle(1, 1, 2, 2))
+        layout.addLayoutItem(map)
+
+        props = {}
+        props["color"] = "green"
+        props["style"] = "solid"
+        props["style_border"] = "solid"
+        props["color_border"] = "red"
+        props["width_border"] = "6.0"
+        props["joinstyle"] = "miter"
+
+        sub_symbol = QgsFillSymbol.createSimple(props)
+
+        line_symbol = QgsFillSymbol()
+        generator = QgsGeometryGeneratorSymbolLayer.create({
+            'geometryModifier': "geom_from_wkt('POLYGON((10 10,287 10,287 200,10 200,10 10))')",
+            'SymbolType': 'Fill',
+        })
+        generator.setUnits(Qgis.RenderUnit.Millimeters)
+        generator.setSubSymbol(sub_symbol)
+
+        line_symbol.changeSymbolLayer(0, generator)
+        shape.setSymbol(line_symbol)
+
+        self.assertTrue(
+            self.render_layout_check(
+                'polygon_generator',
+                layout
+            )
+        )
+
 
 if __name__ == '__main__':
     unittest.main()

tests/src/python/test_qgslayoutpolyline.py

@@ -9,16 +9,20 @@
 __date__ = '14/03/2016'
 __copyright__ = 'Copyright 2016, The QGIS Project'
 
-from qgis.PyQt.QtCore import QPointF
+from qgis.PyQt.QtCore import QPointF, QRectF
 from qgis.PyQt.QtGui import QPolygonF
 from qgis.PyQt.QtXml import QDomDocument
 from qgis.core import (
+    Qgis,
     QgsLayout,
     QgsLayoutItemPolyline,
+    QgsLayoutItemMap,
     QgsLayoutItemRegistry,
     QgsLineSymbol,
     QgsProject,
-    QgsReadWriteContext
+    QgsReadWriteContext,
+    QgsGeometryGeneratorSymbolLayer,
+    QgsRectangle
 )
 import unittest
 from qgis.testing import start_app, QgisTestCase
@@ -384,6 +388,47 @@ def testVerticalLine(self):
             )
         )
 
+    def test_generator(self):
+        project = QgsProject()
+        layout = QgsLayout(project)
+        layout.initializeDefaults()
+
+        p = QPolygonF()
+        p.append(QPointF(0.0, 0.0))
+        p.append(QPointF(100.0, 100.0))
+        shape = QgsLayoutItemPolyline(p, layout)
+        layout.addLayoutItem(shape)
+
+        map = QgsLayoutItemMap(layout)
+        map.attemptSetSceneRect(QRectF(0, 0, 10, 10))
+        map.zoomToExtent(QgsRectangle(1, 1, 2, 2))
+        layout.addLayoutItem(map)
+
+        props = {}
+        props["color"] = "0,0,0,255"
+        props["width"] = "10.0"
+        props["capstyle"] = "square"
+
+        sub_symbol = QgsLineSymbol.createSimple(props)
+
+        line_symbol = QgsLineSymbol()
+        generator = QgsGeometryGeneratorSymbolLayer.create({
+            'geometryModifier': "geom_from_wkt('POLYGON((10 10,287 10,287 200,10 200,10 10))')",
+            'SymbolType': 'Line',
+        })
+        generator.setUnits(Qgis.RenderUnit.Millimeters)
+        generator.setSubSymbol(sub_symbol)
+
+        line_symbol.changeSymbolLayer(0, generator)
+        shape.setSymbol(line_symbol)
+
+        self.assertTrue(
+            self.render_layout_check(
+                'polyline_generator',
+                layout
+            )
+        )
+
 
 if __name__ == '__main__':
     unittest.main()

tests/src/python/test_qgslayoutshape.py

@@ -21,6 +21,10 @@
     QgsProject,
     QgsReadWriteContext,
     QgsUnitTypes,
+    QgsLayoutItemMap,
+    Qgis,
+    QgsGeometryGeneratorSymbolLayer,
+    QgsRectangle
 )
 import unittest
 from qgis.testing import start_app, QgisTestCase
@@ -37,6 +41,10 @@ def setUpClass(cls):
         super(TestQgsLayoutShape, cls).setUpClass()
         cls.item_class = QgsLayoutItemShape
 
+    @classmethod
+    def control_path_prefix(cls):
+        return "layout_shape"
+
     def testClipPath(self):
         pr = QgsProject()
         l = QgsLayout(pr)
@@ -101,6 +109,49 @@ def testBoundingRectForStrokeSizeOnRestore(self):
         # bounding rect for item should include stroke
         self.assertEqual(shape2.boundingRect(), QRectF(-20.0, -20.0, 140.0, 240.0))
 
+    def test_generator(self):
+        project = QgsProject()
+        layout = QgsLayout(project)
+        layout.initializeDefaults()
+
+        shape = QgsLayoutItemShape(layout)
+        shape.setShapeType(QgsLayoutItemShape.Shape.Rectangle)
+        shape.attemptSetSceneRect(QRectF(0, 0, 100, 200))
+        layout.addLayoutItem(shape)
+
+        map = QgsLayoutItemMap(layout)
+        map.attemptSetSceneRect(QRectF(0, 0, 10, 10))
+        map.zoomToExtent(QgsRectangle(1, 1, 2, 2))
+        layout.addLayoutItem(map)
+
+        props = {}
+        props["color"] = "green"
+        props["style"] = "solid"
+        props["style_border"] = "solid"
+        props["color_border"] = "red"
+        props["width_border"] = "6.0"
+        props["joinstyle"] = "miter"
+
+        sub_symbol = QgsFillSymbol.createSimple(props)
+
+        line_symbol = QgsFillSymbol()
+        generator = QgsGeometryGeneratorSymbolLayer.create({
+            'geometryModifier': "geom_from_wkt('POLYGON((10 10,287 10,287 200,10 200,10 10))')",
+            'SymbolType': 'Fill',
+        })
+        generator.setUnits(Qgis.RenderUnit.Millimeters)
+        generator.setSubSymbol(sub_symbol)
+
+        line_symbol.changeSymbolLayer(0, generator)
+        shape.setSymbol(line_symbol)
+
+        self.assertTrue(
+            self.render_layout_check(
+                'layoutshape_generator',
+                layout
+            )
+        )
+
 
 if __name__ == '__main__':
     unittest.main()