svg-filters: init

crates/svg-filters/Cargo.toml

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+[package]
+name = "svg-filters"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+csscolorparser = "0.6.2"
+indexmap = "2.2.5"
+petgraph = "0.6.4"
+quick-xml = { version = "0.31.0", features = ["serialize"] }
+
+[lints]
+workspace = true

crates/svg-filters/src/lib.rs

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+pub fn add(left: usize, right: usize) -> usize {
+    left + right
+}
+
+pub mod types;
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn it_works() {
+        let result = add(2, 2);
+        assert_eq!(result, 4);
+    }
+}

crates/svg-filters/src/types.rs

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+use std::collections::HashMap;
+
+use petgraph::graphmap::DiGraphMap;
+
+pub mod length;
+pub mod nodes;
+
+use self::{
+    length::{Coordinate, Length},
+    nodes::Node,
+};
+
+pub struct Filter<'a> {
+    graph: DiGraphMap<Node, &'a str>,
+}
+pub enum Edge<'a> {
+    Named(&'a str, u8),
+    /// For standard inputs such as SourceGraphic etc., which we'll just be representing as nodes for simplicity
+    Unnamed(u8),
+}

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

@@ -0,0 +1,14 @@
+pub struct Length(f32, Unit);
+pub type Coordinate = Length;
+
+pub enum Unit {
+    None,
+    Em,
+    Ex,
+    Px,
+    In,
+    Cm,
+    Mm,
+    Pt,
+    Pc,
+}

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

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+use self::{primitives::Primitive, standard_input::StandardInput};
+
+use super::length::{Coordinate, Length};
+
+pub mod standard_input;
+
+pub mod primitives;
+
+pub enum Node {
+    /// We represent those as Nodes because they're essentially magical nodes
+    StandardInput(StandardInput),
+    Primitive(Primitive),
+}

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

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+use crate::types::length::{Coordinate, Length};
+
+mod blend;
+mod color_matrix;
+mod component_transfer;
+mod composite;
+mod convolve_matrix;
+mod diffuse_lighting;
+mod displacement_map;
+mod flood;
+mod gaussian_blur;
+mod image;
+mod merge;
+mod morphology;
+mod offset;
+mod specular_lighting;
+mod tile;
+mod turbulence;
+
+pub struct Primitive {
+    primitive: FePrimitive,
+    common_attrs: CommonAttrs,
+}
+
+struct CommonAttrs {
+    x: Coordinate,
+    y: Coordinate,
+    width: Length,
+    height: Length,
+}
+
+/// svg filter effects primitives
+enum FePrimitive {
+    // 2 inputs
+    Blend(blend::Blend),
+    ColorMatrix(color_matrix::ColorMatrix),
+    ComponentTransfer(component_transfer::ComponentTransfer),
+    Composite(composite::Composite),
+    ConvolveMatrix(convolve_matrix::ConvolveMatrix),
+    DiffuseLighting(diffuse_lighting::DiffuseLighting),
+    DisplacementMap(displacement_map::DisplacementMap),
+    Flood(flood::Flood),
+    GaussianBlur(gaussian_blur::GaussianBlur),
+    Image(image::Image),
+    Merge(merge::Merge),
+    Morphology(morphology::Morphology),
+    Offset(offset::Offset),
+    SpecularLighting(specular_lighting::SpecularLighting),
+    Tile(tile::Tile),
+    Turbulence(turbulence::Turbulence),
+}

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

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+/// [feBlend](https://www.w3.org/TR/SVG11/filters.html#feBlendElement)
+pub struct Blend {
+    mode: BlendMode,
+}
+
+/// as according to https://drafts.fxtf.org/compositing-1/#blending
+enum BlendMode {
+    Normal,
+    Multiply,
+    Screen,
+    Overlay,
+    Darken,
+    Lighten,
+    ColorDodge,
+    ColorBurn,
+    HardLight,
+    SoftLight,
+    Difference,
+    Exclusion,
+
+    Hue,
+    Saturation,
+    Color,
+    Luminosity,
+}

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

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+/// [feColorMatrix](https://www.w3.org/TR/SVG11/filters.html#feColorMatrixElement)
+pub struct ColorMatrix {
+    cm_type: ColorMatrixType,
+}
+
+enum ColorMatrixType {
+    Matrix {
+        values: [f32; 20],
+    },
+    Saturate {
+        // is the values attribute anyway tho
+        value: f32,
+    },
+    HueRotate {
+        // also the values attribute
+        degrees: f32,
+    },
+    LuminanceToAlpha,
+}

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

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+/// [feComponentTransfer](https://www.w3.org/TR/SVG11/filters.html#feComponentTransferElement)
+pub struct ComponentTransfer {
+    func_r: TransferFunction,
+    func_g: TransferFunction,
+    func_b: TransferFunction,
+    func_a: TransferFunction,
+}
+
+/// [transfer functions](https://www.w3.org/TR/SVG11/filters.html#transferFuncElements)
+enum TransferFunction {
+    Identity,
+    Table {
+        table_values: Vec<f32>,
+    },
+    Discrete {
+        table_values: Vec<f32>,
+    },
+    Linear {
+        slope: f32,
+        intercept: f32,
+    },
+    Gamma {
+        amplitude: f32,
+        exponent: f32,
+        offset: f32,
+    },
+}

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

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+/// [feComposite](https://www.w3.org/TR/SVG11/filters.html#feCompositeElement)
+pub struct Composite {
+    operator: CompositeOperator,
+}
+
+enum CompositeOperator {
+    Over,
+    In,
+    Out,
+    Atop,
+    Xor,
+    Arithmetic { k1: f32, k2: f32, k3: f32, k4: f32 },
+}

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

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+pub struct ConvolveMatrix {
+    order: (u16, u16),
+    // must be checked to be `order.0 * order.1`
+    kernel_matrix: Vec<f32>,
+    divisor: f32,
+    bias: f32,
+    target_x: i32,
+    target_y: i32,
+    edge_mode: EdgeMode,
+    kernel_unit_length: (f32, f32),
+    preserve_alpha: bool,
+}
+
+enum EdgeMode {
+    None,
+    Duplicate,
+    Wrap,
+}

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

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+// TODO
+pub struct DiffuseLighting;

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

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+/// [feDisplacementMap](https://www.w3.org/TR/SVG11/filters.html#feDisplacementMapElement)
+pub struct DisplacementMap {
+    scale: f32,
+    x_channel_selector: Channel,
+    y_channel_selector: Channel,
+}
+
+enum Channel {
+    A,
+    R,
+    G,
+    B,
+}

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

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+use csscolorparser::Color;
+
+/// [feFlood](https://www.w3.org/TR/SVG11/filters.html#feFloodElement)
+pub struct Flood {
+    flood_color: Color,
+    flood_opacity: f32,
+}

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

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+/// [feGaussianBlur](https://www.w3.org/TR/SVG11/filters.html#feGaussianBlurElement)
+pub struct GaussianBlur {
+    std_deviation: (f32, f32),
+}

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

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+// TODO
+pub struct Image;

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

@@ -0,0 +1,2 @@
+// TODO
+pub struct Merge;

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

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+/// [feMorphology](https://www.w3.org/TR/SVG11/filters.html#feMorphologyElement)
+pub struct Morphology {
+    operator: Operator,
+    radius: (f32, f32),
+}
+
+enum Operator {
+    Erode,
+    Dilate,
+}

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

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+/// [feOffset](https://www.w3.org/TR/SVG11/filters.html#feOffsetElement)
+pub struct Offset {
+    dx: f32,
+    dy: f32,
+}

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

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+// TODO
+pub struct SpecularLighting;

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

@@ -0,0 +1,2 @@
+/// [feTile](https://www.w3.org/TR/SVG11/filters.html#feTileElement)
+pub struct Tile;

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

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+/// [feTurbulence](https://www.w3.org/TR/SVG11/filters.html#feTurbulenceElement)
+pub struct Turbulence {
+    base_frequency: (f32, f32),
+    num_octaves: (u16),
+    seed: u32,
+    stich_tiles: StitchTiles,
+    // attr name: type
+    noise_type: NoiseType,
+}
+
+enum StitchTiles {
+    Stitch,
+    NoStitch,
+}
+enum NoiseType {
+    Turbulence,
+    FractalNoise,
+}

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

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+/// [svg filter effect standard input](https://www.w3.org/TR/SVG11/filters.html#FilterPrimitiveInAttribute)
+/// technically not a node, but for implementation simplicity... yeah
+pub enum StandardInput {
+    SourceGraphic,
+    SourceAlpha,
+    BackgroundImage,
+    BackgroundAlpha,
+    FillPaint,
+    StrokePaint,
+}