decal 0.6.0

Declarative DSL for describing scenes and rendering them to SVG or PNG
Documentation 
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use crate::{
    filters::PrimitiveNode,
    paint::Iri,
};
use enum_display::EnumDisplay;
use std::fmt::{
    Display,
    Formatter,
};

#[derive(Debug, Hash, Eq, PartialEq, Copy, Clone, EnumDisplay)]
enum FilterInputInner {
    #[display("SourceGraphic")]
    SourceGraphic,
    #[display("SourceAlpha")]
    SourceAlpha,
    #[display("{0}")]
    Reference(Iri),
}

/// The input source for a filter primitive.
#[derive(Debug, Hash, Eq, PartialEq, Copy, Clone)]
pub struct FilterInput(FilterInputInner);

impl FilterInput {
    /// Uses the original graphic of the filtered element as input.
    pub const fn source_graphic() -> Self {
        Self(FilterInputInner::SourceGraphic)
    }

    /// Uses the alpha channel of the source graphic as input.
    pub const fn source_alpha() -> Self {
        Self(FilterInputInner::SourceAlpha)
    }

    /// Creates a filter input referencing the output of another primitive.
    pub(crate) const fn reference(iri: Iri) -> Self {
        Self(FilterInputInner::Reference(iri))
    }
}

impl Display for FilterInput {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        write!(f, "{}", self.0)
    }
}

impl From<PrimitiveNode> for FilterInput {
    fn from(value: PrimitiveNode) -> Self {
        Self::reference(value.iri())
    }
}