svg-filters(primitives): start with feComponentTransfer

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

@@ -6,6 +6,7 @@ use self::{
     primitives::{
         blend::{Blend, BlendMode},
         color_matrix::{ColorMatrix, ColorMatrixType},
+        component_transfer::{ComponentTransfer, TransferFn},
         composite::{Composite, CompositeOperator},
         gaussian_blur::GaussianBlur,
         offset::Offset,
@@ -145,9 +146,7 @@ impl Node {
     }
 
     pub fn composite_arithmetic(k1: f32, k2: f32, k3: f32, k4: f32) -> Self {
-        Self::simple(FePrimitive::Composite(Composite::arithmetic(
-            k1, k2, k3, k4,
-        )))
+        Self::composite(CompositeOperator::Arithmetic { k1, k2, k3, k4 })
     }
 
     pub fn gaussian_blur(v: u16) -> Self {
@@ -161,4 +160,18 @@ impl Node {
     pub fn offset(dx: f32, dy: f32) -> Self {
         Self::simple(FePrimitive::Offset(Offset::new(dx, dy)))
     }
+
+    pub fn component_transfer_rgba(
+        r: TransferFn,
+        g: TransferFn,
+        b: TransferFn,
+        a: TransferFn,
+    ) -> Self {
+        Self::simple(FePrimitive::ComponentTransfer(ComponentTransfer {
+            func_r: r,
+            func_g: g,
+            func_b: b,
+            func_a: a,
+        }))
+    }
 }

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

@@ -1,15 +1,15 @@
 /// [feComponentTransfer](https://www.w3.org/TR/SVG11/filters.html#feComponentTransferElement)
 #[derive(Debug)]
 pub struct ComponentTransfer {
-    func_r: TransferFunction,
-    func_g: TransferFunction,
-    func_b: TransferFunction,
-    func_a: TransferFunction,
+    pub func_r: TransferFn,
+    pub func_g: TransferFn,
+    pub func_b: TransferFn,
+    pub func_a: TransferFn,
 }
 
 /// [transfer functions](https://www.w3.org/TR/SVG11/filters.html#transferFuncElements)
 #[derive(Debug)]
-enum TransferFunction {
+pub enum TransferFn {
     Identity,
     Table {
         table_values: Vec<f32>,