Enum ImageFilter 

pub enum ImageFilter {
    Blur {
        sigma_x: f32,
        sigma_y: f32,
    },
    Dilate {
        radius_x: f32,
        radius_y: f32,
    },
    Erode {
        radius_x: f32,
        radius_y: f32,
    },
}

A filter that treats the subtree as an image, so a pixel’s result depends on its neighbours: a blur, a spread, a shrink.

There is no matrix variant. A layer already carries an affine transform, which is what a matrix image filter is, and the widget that reaches it is Transform; a second spelling here would be the same feature under a different name.

Variants

Blur

A Gaussian blur, with a separate standard deviation per axis, in logical pixels. sigma_x and sigma_y may differ, which is how a directional smear is written.

Fields

sigma_x: f32

The standard deviation along x, in logical pixels.

sigma_y: f32

The standard deviation along y, in logical pixels.

Dilate

The brightest neighbour within the radius wins: light shapes grow. The building block of an outer glow or a fattened outline.

Fields

radius_x: f32

The search radius along x, in logical pixels.

radius_y: f32

The search radius along y, in logical pixels.

Erode

The dimmest neighbour within the radius wins: light shapes shrink.

Fields

radius_x: f32

The search radius along x, in logical pixels.

radius_y: f32

The search radius along y, in logical pixels.

Implementations

impl ImageFilter

pub const fn blur(sigma: f32) -> ImageFilter

A Gaussian blur, the same in both directions.

pub fn radius(self) -> (f32, f32)

The filter’s reach in pixels, per axis — how far a pixel can pull from. A Gaussian is truncated at three standard deviations, past which it contributes under half a percent.

pub fn is_identity(self) -> bool

true when the filter would leave every pixel alone, so the whole pre-pass can be skipped. A zero radius is the only such case, and it is a common one: an animated blur passes through zero at both ends.

pub fn scaled_xy(self, sx: f32, sy: f32) -> ImageFilter

Scales the filter’s geometry per axis, as DPI does. A radius is a length and follows its own axis.

pub const fn code(self) -> u32

The shader’s rank for this kind.

Trait Implementations

impl Clone for ImageFilter

fn clone(&self) -> ImageFilter

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for ImageFilter

impl Debug for ImageFilter

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

Formats the value using the given formatter.

impl PartialEq for ImageFilter

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for ImageFilter