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[librsvg: 1/6] filters: rename Filter trait to FilterEffect

commit e0766c3e2f6c20b9ef13f0f261882a1f6430e120
Author: Paolo Borelli <pborelli gnome org>
Date:   Fri Nov 1 09:36:06 2019 +0100

    filters: rename Filter trait to FilterEffect
    
    This avoids name clash with the <filter> element and is consistent
    with the "fe" prefix of all filters.

 rsvg_internals/src/filters/blend.rs              |  6 +++---
 rsvg_internals/src/filters/color_matrix.rs       |  6 +++---
 rsvg_internals/src/filters/component_transfer.rs |  6 +++---
 rsvg_internals/src/filters/composite.rs          |  6 +++---
 rsvg_internals/src/filters/convolve_matrix.rs    |  6 +++---
 rsvg_internals/src/filters/displacement_map.rs   |  6 +++---
 rsvg_internals/src/filters/flood.rs              |  6 +++---
 rsvg_internals/src/filters/gaussian_blur.rs      |  6 +++---
 rsvg_internals/src/filters/image.rs              |  6 +++---
 rsvg_internals/src/filters/light/lighting.rs     |  8 ++++----
 rsvg_internals/src/filters/merge.rs              |  6 +++---
 rsvg_internals/src/filters/mod.rs                | 14 +++++++-------
 rsvg_internals/src/filters/morphology.rs         |  6 +++---
 rsvg_internals/src/filters/offset.rs             |  6 +++---
 rsvg_internals/src/filters/tile.rs               |  6 +++---
 rsvg_internals/src/filters/turbulence.rs         |  6 +++---
 rsvg_internals/src/node.rs                       |  6 +++---
 17 files changed, 56 insertions(+), 56 deletions(-)
---
diff --git a/rsvg_internals/src/filters/blend.rs b/rsvg_internals/src/filters/blend.rs
index 03a91477..7e287215 100755
--- a/rsvg_internals/src/filters/blend.rs
+++ b/rsvg_internals/src/filters/blend.rs
@@ -10,7 +10,7 @@ use crate::surface_utils::shared_surface::SharedImageSurface;
 
 use super::context::{FilterContext, FilterOutput, FilterResult};
 use super::input::Input;
-use super::{Filter, FilterError, PrimitiveWithInput};
+use super::{FilterEffect, FilterError, PrimitiveWithInput};
 
 /// Enumeration of the possible blending modes.
 #[derive(Debug, Clone, Copy, Eq, PartialEq, Hash)]
@@ -53,7 +53,7 @@ impl Default for Blend {
 }
 
 impl NodeTrait for Blend {
-    impl_node_as_filter!();
+    impl_node_as_filter_effect!();
 
     fn set_atts(&mut self, parent: Option<&RsvgNode>, pbag: &PropertyBag<'_>) -> NodeResult {
         self.base.set_atts(parent, pbag)?;
@@ -72,7 +72,7 @@ impl NodeTrait for Blend {
     }
 }
 
-impl Filter for Blend {
+impl FilterEffect for Blend {
     fn render(
         &self,
         _node: &RsvgNode,
diff --git a/rsvg_internals/src/filters/color_matrix.rs b/rsvg_internals/src/filters/color_matrix.rs
index 36596c36..6ed0b5df 100644
--- a/rsvg_internals/src/filters/color_matrix.rs
+++ b/rsvg_internals/src/filters/color_matrix.rs
@@ -14,7 +14,7 @@ use crate::surface_utils::{
 use crate::util::clamp;
 
 use super::context::{FilterContext, FilterOutput, FilterResult};
-use super::{Filter, FilterError, PrimitiveWithInput};
+use super::{FilterEffect, FilterError, PrimitiveWithInput};
 
 /// Color matrix operation types.
 #[derive(Debug, Clone, Copy, Eq, PartialEq)]
@@ -43,7 +43,7 @@ impl Default for ColorMatrix {
 }
 
 impl NodeTrait for ColorMatrix {
-    impl_node_as_filter!();
+    impl_node_as_filter_effect!();
 
     fn set_atts(&mut self, parent: Option<&RsvgNode>, pbag: &PropertyBag<'_>) -> NodeResult {
         self.base.set_atts(parent, pbag)?;
@@ -155,7 +155,7 @@ impl NodeTrait for ColorMatrix {
     }
 }
 
-impl Filter for ColorMatrix {
+impl FilterEffect for ColorMatrix {
     fn render(
         &self,
         _node: &RsvgNode,
diff --git a/rsvg_internals/src/filters/component_transfer.rs 
b/rsvg_internals/src/filters/component_transfer.rs
index 368403b2..06348e9c 100644
--- a/rsvg_internals/src/filters/component_transfer.rs
+++ b/rsvg_internals/src/filters/component_transfer.rs
@@ -18,7 +18,7 @@ use crate::surface_utils::{
 use crate::util::clamp;
 
 use super::context::{FilterContext, FilterOutput, FilterResult};
-use super::{Filter, FilterError, PrimitiveWithInput};
+use super::{FilterEffect, FilterError, PrimitiveWithInput};
 
 /// The `feComponentTransfer` filter primitive.
 pub struct ComponentTransfer {
@@ -36,7 +36,7 @@ impl Default for ComponentTransfer {
 }
 
 impl NodeTrait for ComponentTransfer {
-    impl_node_as_filter!();
+    impl_node_as_filter_effect!();
 
     #[inline]
     fn set_atts(&mut self, parent: Option<&RsvgNode>, pbag: &PropertyBag<'_>) -> NodeResult {
@@ -289,7 +289,7 @@ macro_rules! func_or_default {
     };
 }
 
-impl Filter for ComponentTransfer {
+impl FilterEffect for ComponentTransfer {
     fn render(
         &self,
         node: &RsvgNode,
diff --git a/rsvg_internals/src/filters/composite.rs b/rsvg_internals/src/filters/composite.rs
index a3033fde..b30a4a4c 100644
--- a/rsvg_internals/src/filters/composite.rs
+++ b/rsvg_internals/src/filters/composite.rs
@@ -18,7 +18,7 @@ use crate::util::clamp;
 
 use super::context::{FilterContext, FilterOutput, FilterResult};
 use super::input::Input;
-use super::{Filter, FilterError, PrimitiveWithInput};
+use super::{FilterEffect, FilterError, PrimitiveWithInput};
 
 /// Enumeration of the possible compositing operations.
 #[derive(Debug, Clone, Copy, Eq, PartialEq, Hash)]
@@ -59,7 +59,7 @@ impl Default for Composite {
 }
 
 impl NodeTrait for Composite {
-    impl_node_as_filter!();
+    impl_node_as_filter_effect!();
 
     fn set_atts(&mut self, parent: Option<&RsvgNode>, pbag: &PropertyBag<'_>) -> NodeResult {
         self.base.set_atts(parent, pbag)?;
@@ -129,7 +129,7 @@ pub fn composite_arithmetic(
     }
 }
 
-impl Filter for Composite {
+impl FilterEffect for Composite {
     fn render(
         &self,
         _node: &RsvgNode,
diff --git a/rsvg_internals/src/filters/convolve_matrix.rs b/rsvg_internals/src/filters/convolve_matrix.rs
index 8ff9519a..b792025e 100644
--- a/rsvg_internals/src/filters/convolve_matrix.rs
+++ b/rsvg_internals/src/filters/convolve_matrix.rs
@@ -19,7 +19,7 @@ use crate::surface_utils::{
 use crate::util::clamp;
 
 use super::context::{FilterContext, FilterOutput, FilterResult};
-use super::{Filter, FilterError, PrimitiveWithInput};
+use super::{FilterEffect, FilterError, PrimitiveWithInput};
 
 /// The `feConvolveMatrix` filter primitive.
 pub struct ConvolveMatrix {
@@ -55,7 +55,7 @@ impl Default for ConvolveMatrix {
 }
 
 impl NodeTrait for ConvolveMatrix {
-    impl_node_as_filter!();
+    impl_node_as_filter_effect!();
 
     fn set_atts(&mut self, parent: Option<&RsvgNode>, pbag: &PropertyBag<'_>) -> NodeResult {
         self.base.set_atts(parent, pbag)?;
@@ -224,7 +224,7 @@ impl NodeTrait for ConvolveMatrix {
     }
 }
 
-impl Filter for ConvolveMatrix {
+impl FilterEffect for ConvolveMatrix {
     fn render(
         &self,
         _node: &RsvgNode,
diff --git a/rsvg_internals/src/filters/displacement_map.rs b/rsvg_internals/src/filters/displacement_map.rs
index e4809e2f..e608cfd1 100644
--- a/rsvg_internals/src/filters/displacement_map.rs
+++ b/rsvg_internals/src/filters/displacement_map.rs
@@ -9,7 +9,7 @@ use crate::property_bag::PropertyBag;
 use crate::surface_utils::{iterators::Pixels, shared_surface::SharedImageSurface};
 
 use super::context::{FilterContext, FilterOutput, FilterResult};
-use super::{Filter, FilterError, Input, PrimitiveWithInput};
+use super::{FilterEffect, FilterError, Input, PrimitiveWithInput};
 
 /// Enumeration of the color channels the displacement map can source.
 #[derive(Debug, Clone, Copy, Eq, PartialEq, Hash)]
@@ -44,7 +44,7 @@ impl Default for DisplacementMap {
 }
 
 impl NodeTrait for DisplacementMap {
-    impl_node_as_filter!();
+    impl_node_as_filter_effect!();
 
     fn set_atts(&mut self, parent: Option<&RsvgNode>, pbag: &PropertyBag<'_>) -> NodeResult {
         self.base.set_atts(parent, pbag)?;
@@ -67,7 +67,7 @@ impl NodeTrait for DisplacementMap {
     }
 }
 
-impl Filter for DisplacementMap {
+impl FilterEffect for DisplacementMap {
     fn render(
         &self,
         _node: &RsvgNode,
diff --git a/rsvg_internals/src/filters/flood.rs b/rsvg_internals/src/filters/flood.rs
index e99f3f1e..19d4d129 100644
--- a/rsvg_internals/src/filters/flood.rs
+++ b/rsvg_internals/src/filters/flood.rs
@@ -7,7 +7,7 @@ use crate::property_bag::PropertyBag;
 use crate::surface_utils::shared_surface::{SharedImageSurface, SurfaceType};
 
 use super::context::{FilterContext, FilterOutput, FilterResult};
-use super::{Filter, FilterError, Primitive};
+use super::{FilterEffect, FilterError, Primitive};
 
 /// The `feFlood` filter primitive.
 pub struct Flood {
@@ -25,7 +25,7 @@ impl Default for Flood {
 }
 
 impl NodeTrait for Flood {
-    impl_node_as_filter!();
+    impl_node_as_filter_effect!();
 
     #[inline]
     fn set_atts(&mut self, parent: Option<&RsvgNode>, pbag: &PropertyBag<'_>) -> NodeResult {
@@ -33,7 +33,7 @@ impl NodeTrait for Flood {
     }
 }
 
-impl Filter for Flood {
+impl FilterEffect for Flood {
     fn render(
         &self,
         node: &RsvgNode,
diff --git a/rsvg_internals/src/filters/gaussian_blur.rs b/rsvg_internals/src/filters/gaussian_blur.rs
index b64d45b5..5f3e5725 100644
--- a/rsvg_internals/src/filters/gaussian_blur.rs
+++ b/rsvg_internals/src/filters/gaussian_blur.rs
@@ -16,7 +16,7 @@ use crate::surface_utils::{
 };
 
 use super::context::{FilterContext, FilterOutput, FilterResult};
-use super::{Filter, FilterError, PrimitiveWithInput};
+use super::{FilterEffect, FilterError, PrimitiveWithInput};
 
 /// The maximum gaussian blur kernel size.
 ///
@@ -41,7 +41,7 @@ impl Default for GaussianBlur {
 }
 
 impl NodeTrait for GaussianBlur {
-    impl_node_as_filter!();
+    impl_node_as_filter_effect!();
 
     fn set_atts(&mut self, parent: Option<&RsvgNode>, pbag: &PropertyBag<'_>) -> NodeResult {
         self.base.set_atts(parent, pbag)?;
@@ -196,7 +196,7 @@ fn gaussian_blur(
     )?)
 }
 
-impl Filter for GaussianBlur {
+impl FilterEffect for GaussianBlur {
     fn render(
         &self,
         _node: &RsvgNode,
diff --git a/rsvg_internals/src/filters/image.rs b/rsvg_internals/src/filters/image.rs
index 4fe56987..e11d7271 100644
--- a/rsvg_internals/src/filters/image.rs
+++ b/rsvg_internals/src/filters/image.rs
@@ -14,7 +14,7 @@ use crate::surface_utils::shared_surface::{SharedImageSurface, SurfaceType};
 use crate::viewbox::ViewBox;
 
 use super::context::{FilterContext, FilterOutput, FilterResult};
-use super::{Filter, FilterError, Primitive};
+use super::{FilterEffect, FilterError, Primitive};
 
 /// The `feImage` filter primitive.
 pub struct Image {
@@ -171,7 +171,7 @@ impl Image {
 }
 
 impl NodeTrait for Image {
-    impl_node_as_filter!();
+    impl_node_as_filter_effect!();
 
     fn set_atts(&mut self, parent: Option<&RsvgNode>, pbag: &PropertyBag<'_>) -> NodeResult {
         self.base.set_atts(parent, pbag)?;
@@ -197,7 +197,7 @@ impl NodeTrait for Image {
     }
 }
 
-impl Filter for Image {
+impl FilterEffect for Image {
     fn render(
         &self,
         _node: &RsvgNode,
diff --git a/rsvg_internals/src/filters/light/lighting.rs b/rsvg_internals/src/filters/light/lighting.rs
index 115e381b..cf165e28 100644
--- a/rsvg_internals/src/filters/light/lighting.rs
+++ b/rsvg_internals/src/filters/light/lighting.rs
@@ -27,7 +27,7 @@ use crate::filters::{
         top_row_normal,
         Normal,
     },
-    Filter,
+    FilterEffect,
     FilterError,
     PrimitiveWithInput,
 };
@@ -111,7 +111,7 @@ impl Default for DiffuseLighting {
 }
 
 impl NodeTrait for DiffuseLighting {
-    impl_node_as_filter!();
+    impl_node_as_filter_effect!();
 
     fn set_atts(&mut self, parent: Option<&RsvgNode>, pbag: &PropertyBag<'_>) -> NodeResult {
         self.common.set_atts(parent, pbag)?;
@@ -183,7 +183,7 @@ impl Default for SpecularLighting {
 }
 
 impl NodeTrait for SpecularLighting {
-    impl_node_as_filter!();
+    impl_node_as_filter_effect!();
 
     fn set_atts(&mut self, parent: Option<&RsvgNode>, pbag: &PropertyBag<'_>) -> NodeResult {
         self.common.set_atts(parent, pbag)?;
@@ -272,7 +272,7 @@ impl Lighting for SpecularLighting {
 // not want to make the Lighting trait public, so we use a macro
 macro_rules! impl_lighting_filter {
     ($lighting_type:ty, $alpha_func:ident) => {
-        impl Filter for $lighting_type {
+        impl FilterEffect for $lighting_type {
             fn render(
                 &self,
                 node: &RsvgNode,
diff --git a/rsvg_internals/src/filters/merge.rs b/rsvg_internals/src/filters/merge.rs
index e198f945..5b6ffe49 100644
--- a/rsvg_internals/src/filters/merge.rs
+++ b/rsvg_internals/src/filters/merge.rs
@@ -9,7 +9,7 @@ use crate::surface_utils::shared_surface::{SharedImageSurface, SurfaceType};
 
 use super::context::{FilterContext, FilterOutput, FilterResult};
 use super::input::Input;
-use super::{Filter, FilterError, Primitive};
+use super::{FilterEffect, FilterError, Primitive};
 
 /// The `feMerge` filter primitive.
 pub struct Merge {
@@ -33,7 +33,7 @@ impl Default for Merge {
 }
 
 impl NodeTrait for Merge {
-    impl_node_as_filter!();
+    impl_node_as_filter_effect!();
 
     #[inline]
     fn set_atts(&mut self, parent: Option<&RsvgNode>, pbag: &PropertyBag<'_>) -> NodeResult {
@@ -104,7 +104,7 @@ impl MergeNode {
     }
 }
 
-impl Filter for Merge {
+impl FilterEffect for Merge {
     fn render(
         &self,
         node: &RsvgNode,
diff --git a/rsvg_internals/src/filters/mod.rs b/rsvg_internals/src/filters/mod.rs
index 02b46e2f..1d5745ef 100644
--- a/rsvg_internals/src/filters/mod.rs
+++ b/rsvg_internals/src/filters/mod.rs
@@ -32,7 +32,7 @@ pub mod node;
 use self::node::NodeFilter;
 
 /// A filter primitive interface.
-pub trait Filter: NodeTrait {
+pub trait FilterEffect: NodeTrait {
     /// Renders this filter primitive.
     ///
     /// If this filter primitive can't be rendered for whatever reason (for instance, a required
@@ -52,9 +52,9 @@ pub trait Filter: NodeTrait {
     fn is_affected_by_color_interpolation_filters(&self) -> bool;
 }
 
-macro_rules! impl_node_as_filter {
+macro_rules! impl_node_as_filter_effect {
     () => (
-        fn as_filter(&self) -> Option<&dyn Filter> {
+        fn as_filter_effect(&self) -> Option<&dyn FilterEffect> {
             Some(self)
         }
     )
@@ -94,7 +94,7 @@ struct PrimitiveWithInput {
 impl Primitive {
     /// Constructs a new `Primitive` with empty properties.
     #[inline]
-    fn new<T: Filter>() -> Primitive {
+    fn new<T: FilterEffect>() -> Primitive {
         Primitive {
             x: None,
             y: None,
@@ -194,7 +194,7 @@ impl NodeTrait for Primitive {
 impl PrimitiveWithInput {
     /// Constructs a new `PrimitiveWithInput` with empty properties.
     #[inline]
-    fn new<T: Filter>() -> PrimitiveWithInput {
+    fn new<T: FilterEffect>() -> PrimitiveWithInput {
         PrimitiveWithInput {
             base: Primitive::new::<T>(),
             in_: None,
@@ -297,7 +297,7 @@ pub fn render(
             !in_error
         })
         // Keep only filter primitives (those that implement the Filter trait)
-        .filter(|c| c.borrow().get_node_trait().as_filter().is_some())
+        .filter(|c| c.borrow().get_node_trait().as_filter_effect().is_some())
         // Check if the node wants linear RGB.
         .map(|c| {
             let linear_rgb = {
@@ -312,7 +312,7 @@ pub fn render(
 
     for (c, linear_rgb) in primitives {
         let node_data = c.borrow();
-        let filter = node_data.get_node_trait().as_filter().unwrap();
+        let filter = node_data.get_node_trait().as_filter_effect().unwrap();
 
         let mut render = |filter_ctx: &mut FilterContext| {
             if let Err(err) = filter
diff --git a/rsvg_internals/src/filters/morphology.rs b/rsvg_internals/src/filters/morphology.rs
index edade0c5..35dd30ac 100644
--- a/rsvg_internals/src/filters/morphology.rs
+++ b/rsvg_internals/src/filters/morphology.rs
@@ -18,7 +18,7 @@ use crate::surface_utils::{
 };
 
 use super::context::{FilterContext, FilterOutput, FilterResult};
-use super::{Filter, FilterError, PrimitiveWithInput};
+use super::{FilterEffect, FilterError, PrimitiveWithInput};
 
 /// Enumeration of the possible morphology operations.
 #[derive(Debug, Clone, Copy, Eq, PartialEq, Hash)]
@@ -47,7 +47,7 @@ impl Default for Morphology {
 }
 
 impl NodeTrait for Morphology {
-    impl_node_as_filter!();
+    impl_node_as_filter_effect!();
 
     fn set_atts(&mut self, parent: Option<&RsvgNode>, pbag: &PropertyBag<'_>) -> NodeResult {
         self.base.set_atts(parent, pbag)?;
@@ -74,7 +74,7 @@ impl NodeTrait for Morphology {
     }
 }
 
-impl Filter for Morphology {
+impl FilterEffect for Morphology {
     fn render(
         &self,
         _node: &RsvgNode,
diff --git a/rsvg_internals/src/filters/offset.rs b/rsvg_internals/src/filters/offset.rs
index eeb96c4d..0e3e8180 100644
--- a/rsvg_internals/src/filters/offset.rs
+++ b/rsvg_internals/src/filters/offset.rs
@@ -11,7 +11,7 @@ use crate::surface_utils::shared_surface::SharedImageSurface;
 use crate::util::clamp;
 
 use super::context::{FilterContext, FilterOutput, FilterResult};
-use super::{Filter, FilterError, PrimitiveWithInput};
+use super::{FilterEffect, FilterError, PrimitiveWithInput};
 
 /// The `feOffset` filter primitive.
 pub struct Offset {
@@ -33,7 +33,7 @@ impl Default for Offset {
 }
 
 impl NodeTrait for Offset {
-    impl_node_as_filter!();
+    impl_node_as_filter_effect!();
 
     fn set_atts(&mut self, parent: Option<&RsvgNode>, pbag: &PropertyBag<'_>) -> NodeResult {
         self.base.set_atts(parent, pbag)?;
@@ -50,7 +50,7 @@ impl NodeTrait for Offset {
     }
 }
 
-impl Filter for Offset {
+impl FilterEffect for Offset {
     fn render(
         &self,
         _node: &RsvgNode,
diff --git a/rsvg_internals/src/filters/tile.rs b/rsvg_internals/src/filters/tile.rs
index 2baa3390..47668d57 100644
--- a/rsvg_internals/src/filters/tile.rs
+++ b/rsvg_internals/src/filters/tile.rs
@@ -6,7 +6,7 @@ use crate::property_bag::PropertyBag;
 use crate::surface_utils::shared_surface::SharedImageSurface;
 
 use super::context::{FilterContext, FilterInput, FilterOutput, FilterResult};
-use super::{Filter, FilterError, PrimitiveWithInput};
+use super::{FilterEffect, FilterError, PrimitiveWithInput};
 
 /// The `feTile` filter primitive.
 pub struct Tile {
@@ -24,14 +24,14 @@ impl Default for Tile {
 }
 
 impl NodeTrait for Tile {
-    impl_node_as_filter!();
+    impl_node_as_filter_effect!();
 
     fn set_atts(&mut self, parent: Option<&RsvgNode>, pbag: &PropertyBag<'_>) -> NodeResult {
         self.base.set_atts(parent, pbag)
     }
 }
 
-impl Filter for Tile {
+impl FilterEffect for Tile {
     fn render(
         &self,
         _node: &RsvgNode,
diff --git a/rsvg_internals/src/filters/turbulence.rs b/rsvg_internals/src/filters/turbulence.rs
index fe4da196..81447157 100644
--- a/rsvg_internals/src/filters/turbulence.rs
+++ b/rsvg_internals/src/filters/turbulence.rs
@@ -15,7 +15,7 @@ use crate::surface_utils::{
 use crate::util::clamp;
 
 use super::context::{FilterContext, FilterOutput, FilterResult};
-use super::{Filter, FilterError, Primitive};
+use super::{FilterEffect, FilterError, Primitive};
 
 /// Enumeration of the tile stitching modes.
 #[derive(Debug, Clone, Copy, Eq, PartialEq, Hash)]
@@ -57,7 +57,7 @@ impl Default for Turbulence {
 }
 
 impl NodeTrait for Turbulence {
-    impl_node_as_filter!();
+    impl_node_as_filter_effect!();
 
     #[inline]
     fn set_atts(&mut self, parent: Option<&RsvgNode>, pbag: &PropertyBag<'_>) -> NodeResult {
@@ -334,7 +334,7 @@ impl NoiseGenerator {
     }
 }
 
-impl Filter for Turbulence {
+impl FilterEffect for Turbulence {
     fn render(
         &self,
         node: &RsvgNode,
diff --git a/rsvg_internals/src/node.rs b/rsvg_internals/src/node.rs
index e4aae4a5..9209d4ae 100644
--- a/rsvg_internals/src/node.rs
+++ b/rsvg_internals/src/node.rs
@@ -10,7 +10,7 @@ use crate::cond::{RequiredExtensions, RequiredFeatures, SystemLanguage};
 use crate::css::CssRules;
 use crate::drawing_ctx::DrawingCtx;
 use crate::error::*;
-use crate::filters::Filter;
+use crate::filters::FilterEffect;
 use crate::parsers::Parse;
 use crate::properties::{ComputedValues, SpecifiedValue, SpecifiedValues};
 use crate::property_bag::PropertyBag;
@@ -363,8 +363,8 @@ pub trait NodeTrait: Downcast {
         Ok(draw_ctx.empty_bbox())
     }
 
-    /// Returns the Filter trait if this node is a filter primitive
-    fn as_filter(&self) -> Option<&dyn Filter> {
+    /// Returns the FilterEffect trait if this node is a filter primitive
+    fn as_filter_effect(&self) -> Option<&dyn FilterEffect> {
         None
     }
 }
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