crates/svg-filters/src/tests.rs

@@ -1,10 +1,10 @@
 mod color_matrix;
 
+mod blend;
 mod complex;
 mod gaussian_blur;
 mod offset;
 
-mod blend {}
 mod component_transfer {}
 mod composite {}
 mod convolve_matrix {}

crates/svg-filters/src/tests/blend.rs

@@ -0,0 +1,20 @@
+use crate::{
+    codegen::SvgDocument,
+    types::nodes::{primitives::blend::BlendMode, standard_input::StandardInput},
+};
+
+#[test]
+fn test_offset_blend() {
+    let mut doc = SvgDocument::new();
+
+    let blend = doc.create_filter("blend");
+
+    let offset0 = blend.offset(StandardInput::SourceGraphic, 100., 0.);
+    let offset1 = blend.offset(StandardInput::SourceGraphic, -100., 0.);
+    blend.blend(offset0, offset1, BlendMode::Multiply);
+
+    assert_eq!(
+        doc.generate_svg(),
+        r#"<svg><filter id="blend"><feOffset dx="-100" dy="0" in="SourceGraphic" result="r7"/><feOffset dx="100" dy="0" in="SourceGraphic" result="r6"/><feBlend mode="multiply" in="r6" in2="r7"/></filter></svg>"#
+    );
+}

crates/svg-filters/src/tests/gaussian_blur.rs

@@ -9,5 +9,5 @@ fn test_simple_blur() {
     assert_eq!(
         doc.generate_svg(),
         r#"<svg><filter id="blur"><feGaussianBlur stdDeviation="30 30" in="SourceGraphic"/></filter></svg>"#
-    )
+    );
 }

crates/svg-filters/src/tests/offset.rs

@@ -3,12 +3,12 @@ use crate::{codegen::SvgDocument, types::nodes::standard_input::StandardInput};
 #[test]
 fn test_offset_simple() {
     let mut doc = SvgDocument::new();
-    let mut offset = doc.create_filter("offset");
+    let offset = doc.create_filter("offset");
 
     offset.offset(StandardInput::SourceGraphic, 25., -25.);
 
     assert_eq!(
         doc.generate_svg(),
         r#"<svg><filter id="offset"><feOffset dx="25" dy="-25" in="SourceGraphic"/></filter></svg>"#
-    )
+    );
 }

crates/svg-filters/src/types/graph.rs

@@ -1,11 +1,9 @@
 use std::fmt::{Debug, Display};
 
-use petgraph::{data::Build, prelude::NodeIndex, prelude::*, visit::IntoNeighborsDirected};
+use petgraph::{prelude::NodeIndex, prelude::*};
 
 use crate::Node;
 
-use self::edge::Edge;
-
 use super::nodes::standard_input::StandardInput;
 
 #[derive(Debug)]
@@ -141,9 +139,12 @@ impl FilterGraph {
 }
 
 pub mod abstracted_inputs {
-    use petgraph::{data::Build, prelude::NodeIndex};
+    use petgraph::prelude::NodeIndex;
 
-    use crate::{types::nodes::primitives::color_matrix::ColorMatrixType, Node};
+    use crate::{
+        types::nodes::primitives::{blend::BlendMode, color_matrix::ColorMatrixType},
+        Node,
+    };
 
     use super::{FilterGraph, NodeInput};
 
@@ -178,6 +179,20 @@ pub mod abstracted_inputs {
             node_idx
         }
 
+        pub fn blend(
+            &mut self,
+            r#in: impl Into<NodeInput>,
+            in2: impl Into<NodeInput>,
+            mode: BlendMode,
+        ) -> NodeIndex {
+            let node_idx = self.dag.add_node(Node::blend(mode));
+            self.dag
+                .add_edge(self.resolve_input(r#in.into()), node_idx, ());
+            self.dag
+                .add_edge(self.resolve_input(in2.into()), node_idx, ());
+            node_idx
+        }
+
         pub fn composite_arithmetic(
             &mut self,
             r#in: impl Into<NodeInput>,

crates/svg-filters/src/types/nodes/primitives.rs

@@ -82,7 +82,7 @@ pub enum FePrimitive {
 impl WriteElement for FePrimitive {
     fn attrs(&self) -> std::vec::Vec<quick_xml::events::attributes::Attribute<'_>> {
         match self {
-            FePrimitive::Blend(_) => todo!(),
+            FePrimitive::Blend(el) => el.attrs(),
             FePrimitive::ColorMatrix(el) => el.attrs(),
             FePrimitive::ComponentTransfer(_) => todo!(),
             FePrimitive::Composite(el) => el.attrs(),
@@ -103,7 +103,7 @@ impl WriteElement for FePrimitive {
 
     fn tag_name(&self) -> &'static str {
         match self {
-            FePrimitive::Blend(_) => todo!(),
+            FePrimitive::Blend(el) => el.tag_name(),
             FePrimitive::ColorMatrix(el) => el.tag_name(),
             FePrimitive::ComponentTransfer(_) => todo!(),
             FePrimitive::Composite(el) => el.tag_name(),