Struct Filter 

pub struct Filter { /* private fields */ }

A directed acyclic graph (DAG) of filter operations.

The graph represents a pipeline of filter primitives where outputs of some primitives can be used as inputs to others. Each primitive has a unique FilterId.

Implementations

impl Filter

pub fn empty() -> Self

Create a new empty filter graph.

pub fn single(primitive: FilterEffect) -> Self

Create a filter from a single filter effect.

Creates a simple filter graph with a single primitive. Use this for direct access to low-level SVG filter operations.

pub fn linear_list(primitives: impl Iterator<Item = FilterEffect>) -> Self

Create a filter from an iterator of filter effects.

Creates a filter graph where the effects are applied in order.

pub fn add(&mut self, effect: FilterEffect, inputs: FilterInputs) -> FilterId

Add a filter primitive with optional inputs.

Returns a FilterId that can be referenced by other primitives. Automatically updates the accumulated bounds expansion based on the primitive’s requirements.

pub fn nodes(&self) -> &[FilterGraphNode]

The list of nodes in the graph

pub fn output(&self) -> FilterId

The output filter for the graph.

pub fn linear_bounds_expansion(&self, transform: &Affine) -> Rect

Calculate the bounds expansion for this filter in pixel/device space.

Returns a Rect representing how many extra pixels are needed around the filtered region to correctly compute the filter effect. For example, a blur filter needs to sample beyond the original bounds to avoid edge artifacts.

The expansion accounts for the transform (rotation, scale, and shear) to compute the correct axis-aligned bounding box expansion in device space.

The returned rect is centered at origin:

• x0: negative left expansion (in pixels)
• y0: negative top expansion (in pixels)
• x1: positive right expansion (in pixels)
• y1: positive bottom expansion (in pixels)

Arguments

• transform - The transform applied to this filter layer

pub fn bounds_expansion(&self, transform: &Affine) -> Rect

Get the accumulated bounds expansion for all primitives in this graph.

This returns the expansion required by all primitives in the graph, representing the padding needed to render all filter effects correctly.

The expansion accounts for the transform (rotation, scale, and shear) to compute the correct axis-aligned bounding box expansion in device space.

Arguments

• transform - The transform applied to this filter layer

pub fn expansion_rect(&self) -> Rect

Trait Implementations

impl Clone for Filter

fn clone(&self) -> Filter

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Filter

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Filter

fn default() -> Self

Returns the “default value” for a type.

impl PartialEq for Filter

fn eq(&self, other: &Filter) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Filter