Struct BackdropCaptures 

pub struct BackdropCaptures { /* private fields */ }

The backdrop captures of one frame, in paint order.

Flutter’s BackdropGroup: stages that share a BackdropKey sample one backdrop, captured where the first of them paints, so a later stage does not see an earlier one’s output. Sharing is per render target (scope): a stage painting into an isolated layer, such as an opacity group, reads that layer, and never a capture of another target.

Implementations

impl BackdropCaptures

pub fn new() -> Self

pub fn clear(&mut self)

Forgets every capture, for the start of a frame.

pub fn sample( &mut self, layer: LayerId, key: Option<BackdropKey>, scope: u64, ) -> BackdropSample

How the stage layer gets its backdrop when it is reached in paint order, painting into the target scope. An unkeyed stage always captures; the first stage of a key in a scope captures and the later ones share it.

Trait Implementations

impl Clone for BackdropCaptures

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for BackdropCaptures

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

Formats the value using the given formatter.

impl Default for BackdropCaptures

fn default() -> Self

Returns the “default value” for a type.