enable dynamic SVGs for fill symbol (#40902)

python/core/auto_generated/symbology/qgsfillsymbollayer.sip.in

@@ -1414,6 +1414,20 @@ Returns the map unit scale for the pattern's stroke.
     virtual QgsMapUnitScale mapUnitScale() const;
 
 
+    QMap<QString, QgsProperty> parameters() const;
+%Docstring
+Returns the dynamic SVG parameters
+
+.. versionadded:: 3.18
+%End
+
+    void setParameters( const QMap<QString, QgsProperty> &parameters );
+%Docstring
+Sets the dynamic SVG parameters
+
+.. versionadded:: 3.18
+%End
+
   protected:
 
     virtual void applyDataDefinedSettings( QgsSymbolRenderContext &context );

src/core/symbology/qgsfillsymbollayer.cpp

@@ -2005,6 +2005,21 @@ QgsSymbolLayer *QgsSVGFillSymbolLayer::create( const QVariantMap &properties )
     symbolLayer->setStrokeWidthMapUnitScale( QgsSymbolLayerUtils::decodeMapUnitScale( properties[QStringLiteral( "outline_width_map_unit_scale" )].toString() ) );
   }
 
+  if ( properties.contains( QStringLiteral( "parameters" ) ) )
+  {
+    const QVariantMap parameters = properties[QStringLiteral( "parameters" )].toMap();
+    QMap<QString, QgsProperty> parametersProperties;
+    QVariantMap::const_iterator it = parameters.constBegin();
+    for ( ; it != parameters.constEnd(); ++it )
+    {
+      QgsProperty property;
+      if ( property.loadVariant( it.value() ) )
+        parametersProperties.insert( it.key(), property );
+    }
+
+    symbolLayer->setParameters( parametersProperties );
+  }
+
   symbolLayer->restoreOldDataDefinedProperties( properties );
 
   return symbolLayer.release();
@@ -2030,7 +2045,7 @@ QString QgsSVGFillSymbolLayer::layerType() const
 void QgsSVGFillSymbolLayer::applyPattern( QBrush &brush, const QString &svgFilePath, double patternWidth, QgsUnitTypes::RenderUnit patternWidthUnit,
     const QColor &svgFillColor, const QColor &svgStrokeColor, double svgStrokeWidth,
     QgsUnitTypes::RenderUnit svgStrokeWidthUnit, const QgsSymbolRenderContext &context,
-    const QgsMapUnitScale &patternWidthMapUnitScale, const QgsMapUnitScale &svgStrokeWidthMapUnitScale )
+    const QgsMapUnitScale &patternWidthMapUnitScale, const QgsMapUnitScale &svgStrokeWidthMapUnitScale, const QgsStringMap svgParameters )
 {
   if ( mSvgViewBox.isNull() )
   {
@@ -2048,7 +2063,7 @@ void QgsSVGFillSymbolLayer::applyPattern( QBrush &brush, const QString &svgFileP
     bool fitsInCache = true;
     double strokeWidth = context.renderContext().convertToPainterUnits( svgStrokeWidth, svgStrokeWidthUnit, svgStrokeWidthMapUnitScale );
     QImage patternImage = QgsApplication::svgCache()->svgAsImage( svgFilePath, size, svgFillColor, svgStrokeColor, strokeWidth,
-                          context.renderContext().scaleFactor(), fitsInCache, 0, ( context.renderContext().flags() & QgsRenderContext::RenderBlocking ) );
+                          context.renderContext().scaleFactor(), fitsInCache, 0, ( context.renderContext().flags() & QgsRenderContext::RenderBlocking ), svgParameters );
     if ( !fitsInCache )
     {
       QPicture patternPict = QgsApplication::svgCache()->svgAsPicture( svgFilePath, size, svgFillColor, svgStrokeColor, strokeWidth,
@@ -2082,8 +2097,9 @@ void QgsSVGFillSymbolLayer::applyPattern( QBrush &brush, const QString &svgFileP
 
 void QgsSVGFillSymbolLayer::startRender( QgsSymbolRenderContext &context )
 {
+  QgsStringMap evaluatedParameters = QgsSymbolLayerUtils::evaluatePropertiesMap( mParameters, context.renderContext().expressionContext() );
 
-  applyPattern( mBrush, mSvgFilePath, mPatternWidth, mPatternWidthUnit, mColor, mSvgStrokeColor, mSvgStrokeWidth, mSvgStrokeWidthUnit, context, mPatternWidthMapUnitScale, mSvgStrokeWidthMapUnitScale );
+  applyPattern( mBrush, mSvgFilePath, mPatternWidth, mPatternWidthUnit, mColor, mSvgStrokeColor, mSvgStrokeWidth, mSvgStrokeWidthUnit, context, mPatternWidthMapUnitScale, mSvgStrokeWidthMapUnitScale, evaluatedParameters );
 
   if ( mStroke )
   {
@@ -2126,6 +2142,13 @@ QVariantMap QgsSVGFillSymbolLayer::properties() const
   map.insert( QStringLiteral( "svg_outline_width_map_unit_scale" ), QgsSymbolLayerUtils::encodeMapUnitScale( mSvgStrokeWidthMapUnitScale ) );
   map.insert( QStringLiteral( "outline_width_unit" ), QgsUnitTypes::encodeUnit( mStrokeWidthUnit ) );
   map.insert( QStringLiteral( "outline_width_map_unit_scale" ), QgsSymbolLayerUtils::encodeMapUnitScale( mStrokeWidthMapUnitScale ) );
+
+  QVariantMap parameters;
+  QMap<QString, QgsProperty>::const_iterator it = mParameters.constBegin();
+  for ( ; it != mParameters.constEnd(); ++it )
+    parameters.insert( it.key(), it.value().toVariant() );
+  map[QStringLiteral( "parameters" )] = parameters;
+
   return map;
 }
 
@@ -2151,6 +2174,8 @@ QgsSVGFillSymbolLayer *QgsSVGFillSymbolLayer::clone() const
   clonedLayer->setStrokeWidthUnit( mStrokeWidthUnit );
   clonedLayer->setStrokeWidthMapUnitScale( mStrokeWidthMapUnitScale );
 
+  clonedLayer->setParameters( mParameters );
+
   if ( mStroke )
   {
     clonedLayer->setSubSymbol( mStroke->clone() );
@@ -2330,8 +2355,10 @@ void QgsSVGFillSymbolLayer::applyDataDefinedSettings( QgsSymbolRenderContext &co
     context.setOriginalValueVariable( mSvgStrokeWidth );
     strokeWidth = mDataDefinedProperties.valueAsDouble( QgsSymbolLayer::PropertyStrokeWidth, context.renderContext().expressionContext(), mSvgStrokeWidth );
   }
+  QgsStringMap evaluatedParameters = QgsSymbolLayerUtils::evaluatePropertiesMap( mParameters, context.renderContext().expressionContext() );
+
   applyPattern( mBrush, svgFile, width, mPatternWidthUnit, svgFillColor, svgStrokeColor, strokeWidth,
-                mSvgStrokeWidthUnit, context, mPatternWidthMapUnitScale, mSvgStrokeWidthMapUnitScale );
+                mSvgStrokeWidthUnit, context, mPatternWidthMapUnitScale, mSvgStrokeWidthMapUnitScale, evaluatedParameters );
 
 }
 
@@ -2394,6 +2421,11 @@ void QgsSVGFillSymbolLayer::setDefaultSvgParams()
   }
 }
 
+void QgsSVGFillSymbolLayer::setParameters( const QMap<QString, QgsProperty> &parameters )
+{
+  mParameters = parameters;
+}
+
 
 QgsLinePatternFillSymbolLayer::QgsLinePatternFillSymbolLayer()
   : QgsImageFillSymbolLayer()

src/core/symbology/qgsfillsymbollayer.h

@@ -1254,6 +1254,18 @@ class CORE_EXPORT QgsSVGFillSymbolLayer: public QgsImageFillSymbolLayer
     void setMapUnitScale( const QgsMapUnitScale &scale ) override;
     QgsMapUnitScale mapUnitScale() const override;
 
+    /**
+     * Returns the dynamic SVG parameters
+     * \since QGIS 3.18
+     */
+    QMap<QString, QgsProperty> parameters() const { return mParameters; }
+
+    /**
+     * Sets the dynamic SVG parameters
+     * \since QGIS 3.18
+     */
+    void setParameters( const QMap<QString, QgsProperty> &parameters );
+
   protected:
 
     void applyDataDefinedSettings( QgsSymbolRenderContext &context ) override;
@@ -1264,6 +1276,7 @@ class CORE_EXPORT QgsSVGFillSymbolLayer: public QgsImageFillSymbolLayer
     double mPatternWidth = 20;
     QgsUnitTypes::RenderUnit mPatternWidthUnit = QgsUnitTypes::RenderMillimeters;
     QgsMapUnitScale mPatternWidthMapUnitScale;
+    QMap<QString, QgsProperty> mParameters;
 
     //! SVG data
     QByteArray mSvgData;
@@ -1285,7 +1298,8 @@ class CORE_EXPORT QgsSVGFillSymbolLayer: public QgsImageFillSymbolLayer
 
     //! Applies the svg pattern to the brush
     void applyPattern( QBrush &brush, const QString &svgFilePath, double patternWidth, QgsUnitTypes::RenderUnit patternWidthUnit, const QColor &svgFillColor, const QColor &svgStrokeColor,
-                       double svgStrokeWidth, QgsUnitTypes::RenderUnit svgStrokeWidthUnit, const QgsSymbolRenderContext &context, const QgsMapUnitScale &patternWidthMapUnitScale, const QgsMapUnitScale &svgStrokeWidthMapUnitScale );
+                       double svgStrokeWidth, QgsUnitTypes::RenderUnit svgStrokeWidthUnit, const QgsSymbolRenderContext &context, const QgsMapUnitScale &patternWidthMapUnitScale, const QgsMapUnitScale &svgStrokeWidthMapUnitScale,
+                       const QgsStringMap svgParameters );
 };
 
 /**

src/gui/symbology/qgssymbollayerwidget.cpp

@@ -2729,6 +2729,7 @@ QgsSVGFillSymbolLayerWidget::QgsSVGFillSymbolLayerWidget( QgsVectorLayer *vl, QW
   mLayer = nullptr;
   setupUi( this );
 
+  mSvgSelectorWidget->setAllowParameters( true );
   mSvgSelectorWidget->sourceLineEdit()->setPropertyOverrideToolButtonVisible( true );
 
   connect( mTextureWidthSpinBox, static_cast < void ( QDoubleSpinBox::* )( double ) > ( &QDoubleSpinBox::valueChanged ), this, &QgsSVGFillSymbolLayerWidget::mTextureWidthSpinBox_valueChanged );
@@ -2853,7 +2854,7 @@ void QgsSVGFillSymbolLayerWidget::setFile( const QString &name )
 
 void QgsSVGFillSymbolLayerWidget::setSvgParameters( const QMap<QString, QgsProperty> &parameters )
 {
-  // TODO mLayer->setParameters(parameters);
+  mLayer->setParameters( parameters );
   whileBlocking( mSvgSelectorWidget )->setSvgParameters( parameters );
 
   updateParamGui();