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svg-filters: implement feComponentTransfer rendering

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This commit is contained in:
Schrottkatze 2024-03-22 16:05:36 +01:00
parent c31a158d9b
commit 9727ef82ca
Signed by: schrottkatze
SSH key fingerprint: SHA256:hXb3t1vINBFCiDCmhRABHX5ocdbLiKyCdKI4HK2Rbbc
3 changed files with 160 additions and 3 deletions
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39
crates/svg-filters/src/tests.rs
View file

@ -5,7 +5,44 @@ mod complex;
mod gaussian_blur;
mod offset;
mod component_transfer {}
mod component_transfer {
use crate::{
codegen::SvgDocument,
types::nodes::primitives::{
component_transfer::{ComponentTransfer, TransferFn},
FePrimitive,
},
Node,
};
#[test]
fn test_comp_trans_simple() {
let mut doc = SvgDocument::new();
let comptrans = doc.create_filter("comp_trans");
comptrans.add_node(Node::simple(FePrimitive::ComponentTransfer(
ComponentTransfer {
func_r: TransferFn::Table {
table_values: vec![0., 0.1, 0.4, 0.9],
},
func_g: TransferFn::Discrete {
table_values: vec![0.1, 0.3, 0.5, 0.7, 0.9],
},
func_b: TransferFn::Linear {
slope: 1.0,
intercept: 0.75,
},
func_a: TransferFn::Identity,
},
)));
assert_eq!(
doc.generate_svg(),
r#"<svg><filter id="comp_trans"><feComponentTransfer><feFuncR type="table" tableValues="0 0.1 0.4 0.9"/><feFuncG type="discrete" tableValues="0.1 0.3 0.5 0.7 0.9"/><feFuncB type="linear" slope="1" intercept="0.75"/><feFuncA type="identity"/></feComponentTransfer></filter></svg>"#
);
}
}
mod composite {}
mod convolve_matrix {}
mod diffuse_lighting {}

31
crates/svg-filters/src/types/nodes/primitives.rs
View file

@ -84,7 +84,7 @@ impl WriteElement for FePrimitive {
match self {
FePrimitive::Blend(el) => el.attrs(),
FePrimitive::ColorMatrix(el) => el.attrs(),
FePrimitive::ComponentTransfer(_) => todo!(),
FePrimitive::ComponentTransfer(el) => el.attrs(),
FePrimitive::Composite(el) => el.attrs(),
FePrimitive::ConvolveMatrix(_) => todo!(),
FePrimitive::DiffuseLighting(_) => todo!(),
@ -105,7 +105,7 @@ impl WriteElement for FePrimitive {
match self {
FePrimitive::Blend(el) => el.tag_name(),
FePrimitive::ColorMatrix(el) => el.tag_name(),
FePrimitive::ComponentTransfer(_) => todo!(),
FePrimitive::ComponentTransfer(el) => el.tag_name(),
FePrimitive::Composite(el) => el.tag_name(),
FePrimitive::ConvolveMatrix(_) => todo!(),
FePrimitive::DiffuseLighting(_) => todo!(),
@ -121,4 +121,31 @@ impl WriteElement for FePrimitive {
FePrimitive::Turbulence(el) => el.tag_name(),
}
}
fn element_writer<'writer, 'result>(
&self,
writer: &'writer mut Writer<&'result mut Vec<u8>>,
common: CommonAttrs,
inputs: Vec<String>,
output: Option<String>,
) -> quick_xml::Result<&'writer mut quick_xml::Writer<&'result mut Vec<u8>>> {
match self {
FePrimitive::Blend(el) => el.element_writer(writer, common, inputs, output),
FePrimitive::ColorMatrix(el) => el.element_writer(writer, common, inputs, output),
FePrimitive::ComponentTransfer(el) => el.element_writer(writer, common, inputs, output),
FePrimitive::Composite(el) => el.element_writer(writer, common, inputs, output),
FePrimitive::ConvolveMatrix(_) => todo!(),
FePrimitive::DiffuseLighting(_) => todo!(),
FePrimitive::DisplacementMap(_) => todo!(),
FePrimitive::Flood(_) => todo!(),
FePrimitive::GaussianBlur(el) => el.element_writer(writer, common, inputs, output),
FePrimitive::Image(_) => todo!(),
FePrimitive::Merge(_) => todo!(),
FePrimitive::Morphology(_) => todo!(),
FePrimitive::Offset(el) => el.element_writer(writer, common, inputs, output),
FePrimitive::SpecularLighting(_) => todo!(),
FePrimitive::Tile(_) => todo!(),
FePrimitive::Turbulence(el) => el.element_writer(writer, common, inputs, output),
}
}
}

93
crates/svg-filters/src/types/nodes/primitives/component_transfer.rs
View file

@ -1,3 +1,5 @@
use quick_xml::{events::attributes::Attribute, Writer};
use super::WriteElement;
/// [feComponentTransfer](https://www.w3.org/TR/SVG11/filters.html#feComponentTransferElement)
@ -17,6 +19,44 @@ impl WriteElement for ComponentTransfer {
fn tag_name(&self) -> &'static str {
"feComponentTransfer"
}
fn element_writer<'writer, 'result>(
&self,
writer: &'writer mut quick_xml::Writer<&'result mut Vec<u8>>,
common: crate::types::nodes::CommonAttrs,
inputs: Vec<String>,
output: Option<String>,
) -> quick_xml::Result<&'writer mut quick_xml::Writer<&'result mut Vec<u8>>> {
let inputs: Vec<_> = inputs
.into_iter()
.enumerate()
.map(|(i, edge)| {
(
match i {
0 => "in".to_owned(),
n => format!("in{}", n + 1),
}
.into_bytes(),
edge.into_bytes(),
)
})
.collect();
let mut el_writer = writer
.create_element(self.tag_name())
.with_attributes(inputs.iter().map(|(k, v)| (&k[..], &v[..])))
.with_attributes(Into::<Vec<Attribute<'_>>>::into(common));
if let Some(output) = output {
el_writer = el_writer.with_attribute(("result", output.as_str()));
}
el_writer.write_inner_content(|writer| {
self.func_r.write_self(writer, "feFuncR")?;
self.func_g.write_self(writer, "feFuncG")?;
self.func_b.write_self(writer, "feFuncB")?;
self.func_a.write_self(writer, "feFuncA")?;
Ok(())
})
}
}
/// [transfer functions](https://www.w3.org/TR/SVG11/filters.html#transferFuncElements)
@ -39,3 +79,56 @@ pub enum TransferFn {
offset: f32,
},
}
impl TransferFn {
#[allow(clippy::str_to_string, reason = "inside macro call")]
fn write_self<'writer, 'result>(
&self,
target: &'writer mut Writer<&'result mut Vec<u8>>,
name: &'static str,
) -> quick_xml::Result<&'writer mut Writer<&'result mut Vec<u8>>> {
target
.create_element(name)
.with_attributes(match self {
TransferFn::Identity => gen_attrs![b"type": "identity"],
TransferFn::Table { table_values } => gen_attrs![
b"type": "table",
b"tableValues": table_values
.iter()
.map(std::string::ToString::to_string)
.reduce(|mut acc, e| {
acc.push(' ');
acc.push_str(&e);
acc
}).expect("empty tables disallowed")
],
TransferFn::Discrete { table_values } => gen_attrs![
b"type": "discrete",
b"tableValues": table_values
.iter()
.map(std::string::ToString::to_string)
.reduce(|mut acc, e| {
acc.push(' ');
acc.push_str(&e);
acc
}).expect("empty tables disallowed")
],
TransferFn::Linear { slope, intercept } => gen_attrs![
b"type": "linear",
b"slope": slope,
b"intercept": intercept
],
TransferFn::Gamma {
amplitude,
exponent,
offset,
} => gen_attrs![
b"type": "gamma",
b"amplitude": amplitude,
b"exponent": exponent,
b"offset": offset
],
})
.write_empty()
}
}