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use markup5ever::{expanded_name, local_name, namespace_url, ns};
use crate::document::AcquiredNodes;
use crate::drawing_ctx::DrawingCtx;
use crate::element::{ElementResult, SetAttributes};
use crate::node::Node;
use crate::parsers::ParseValue;
use crate::properties::ColorInterpolationFilters;
use crate::rect::IRect;
use crate::session::Session;
use crate::xml::Attributes;
use super::bounds::BoundsBuilder;
use super::context::{FilterContext, FilterOutput};
use super::{
FilterEffect, FilterError, FilterResolveError, Input, Primitive, PrimitiveParams,
ResolvedPrimitive,
};
/// The `feOffset` filter primitive.
#[derive(Default)]
pub struct FeOffset {
base: Primitive,
params: Offset,
}
/// Resolved `feOffset` primitive for rendering.
#[derive(Clone, Default)]
pub struct Offset {
pub in1: Input,
pub dx: f64,
pub dy: f64,
}
impl SetAttributes for FeOffset {
fn set_attributes(&mut self, attrs: &Attributes, session: &Session) -> ElementResult {
self.params.in1 = self.base.parse_one_input(attrs, session)?;
for (attr, value) in attrs.iter() {
match attr.expanded() {
expanded_name!("", "dx") => self.params.dx = attr.parse(value)?,
expanded_name!("", "dy") => self.params.dy = attr.parse(value)?,
_ => (),
}
}
Ok(())
}
}
impl Offset {
pub fn render(
&self,
bounds_builder: BoundsBuilder,
ctx: &FilterContext,
acquired_nodes: &mut AcquiredNodes<'_>,
draw_ctx: &mut DrawingCtx,
) -> Result<FilterOutput, FilterError> {
// https://www.w3.org/TR/filter-effects/#ColorInterpolationFiltersProperty
//
// "Note: The color-interpolation-filters property just has an
// effect on filter operations. Therefore, it has no effect on
// filter primitives like feOffset"
//
// This is why we pass Auto here.
let input_1 = ctx.get_input(
acquired_nodes,
draw_ctx,
&self.in1,
ColorInterpolationFilters::Auto,
)?;
let bounds: IRect = bounds_builder
.add_input(&input_1)
.compute(ctx)
.clipped
.into();
let (dx, dy) = ctx.paffine().transform_distance(self.dx, self.dy);
let surface = input_1.surface().offset(bounds, dx, dy)?;
Ok(FilterOutput { surface, bounds })
}
}
impl FilterEffect for FeOffset {
fn resolve(
&self,
_acquired_nodes: &mut AcquiredNodes<'_>,
_node: &Node,
) -> Result<ResolvedPrimitive, FilterResolveError> {
Ok(ResolvedPrimitive {
primitive: self.base.clone(),
params: PrimitiveParams::Offset(self.params.clone()),
})
}
}
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