Struct Backdrop 

pub struct Backdrop {
    pub filter: ImageFilter,
    pub shared_key: Option<u64>,
}

Backdrop filters the sampled scene before a save layer’s children paint.

Compose image filters to control the order of backdrop effects. The layer’s paint separately controls how the filtered backdrop and children composite.

Fields

filter: ImageFilter

filter transforms the sampled scene in local coordinates.

shared_key: Option<u64>

shared_key lets tiles reuse the first matching filtered snapshot. Use one key only for tiles over the same background with the same filter.

Implementations

impl Backdrop

pub fn new(filter: ImageFilter) -> Backdrop

new filters the backdrop with filter before foreground content paints.

pub fn blur(sigma: f32) -> Backdrop

blur creates an isotropic Gaussian backdrop blur in local units.

pub fn shared(self, key: u64) -> Backdrop

shared marks this backdrop as one tile of a keyed group.

Trait Implementations

impl Clone for Backdrop

fn clone(&self) -> Backdrop

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Backdrop

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

Formats the value using the given formatter.