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, which sees the scene as of the first tile. 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.

impl PartialEq for Backdrop

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Backdrop