Enum FilterFunction 

pub enum FilterFunction {
    Blur {
        radius: f32,
    },
    Brightness {
        amount: f32,
    },
    Contrast {
        amount: f32,
    },
    Grayscale {
        amount: f32,
    },
    HueRotate {
        angle: f32,
    },
    Invert {
        amount: f32,
    },
    Opacity {
        amount: f32,
    },
    Saturate {
        amount: f32,
    },
    Sepia {
        amount: f32,
    },
}

High-level filter functions for common effects (CSS filter functions).

These match the CSS Filter Effects specification and provide simple, commonly-used visual effects without needing to construct a filter graph.

See: https://drafts.fxtf.org/filter-effects/#filter-functions

Variants

Blur

Gaussian blur effect.

Applies a Gaussian blur to the input image. Larger radius values produce more blur. The blur is applied equally in all directions.

Note: Per the W3C Filter Effects specification, this radius parameter represents the standard deviation (σ) of the Gaussian function, not the effective blur range. The effective blur range is approximately 3× this value.

Fields

radius: f32

Standard deviation of the Gaussian blur in pixels. Must be non-negative. A value of 0 means no blur.

Despite being called “radius” (to match CSS filter syntax), this is actually the standard deviation. The visible blur effect extends approximately 3 times this value in each direction.

Brightness

Brightness adjustment.

Adjusts the brightness of the input image using a linear multiplier.

Fields

amount: f32

Brightness amount: 0.0 = completely black, 1.0 = no change, >1.0 = brighter. Must be non-negative.

Contrast

Contrast adjustment.

Adjusts the contrast of the input image.

Fields

amount: f32

Contrast amount: 0.0 = uniform gray, 1.0 = no change, >1.0 = higher contrast. Must be non-negative.

Grayscale

Grayscale conversion.

Converts the input to grayscale. Amount controls the strength of the conversion.

Fields

amount: f32

Grayscale amount: 0.0 = original colors, 1.0 = full grayscale. Values should be in range [0.0, 1.0].

HueRotate

Hue rotation.

Rotates the hue of all colors in the input image by the specified angle.

Fields

angle: f32

Rotation angle in degrees. Can be negative. 0° = no change, 180° = opposite hue, 360° = back to original.

Invert

Color inversion.

Inverts the colors of the input image.

Fields

amount: f32

Inversion amount: 0.0 = original colors, 1.0 = fully inverted. Values should be in range [0.0, 1.0].

Opacity

Opacity adjustment.

Multiplies the alpha channel by the specified amount.

Fields

amount: f32

Opacity amount: 0.0 = fully transparent, 1.0 = no change. Values should be in range [0.0, 1.0].

Saturate

Saturation adjustment.

Adjusts the color saturation of the input image.

Fields

amount: f32

Saturation amount: 0.0 = completely desaturated (grayscale), 1.0 = no change, >1.0 = oversaturated. Must be non-negative.

Sepia

Sepia tone effect.

Applies a sepia tone effect (vintage/old photo appearance).

Fields

amount: f32

Sepia amount: 0.0 = original colors, 1.0 = full sepia tone. Values should be in range [0.0, 1.0].

Trait Implementations

impl Clone for FilterFunction

fn clone(&self) -> FilterFunction

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FilterFunction

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

Formats the value using the given formatter.