Struct FrameLayers 

pub struct FrameLayers {
    pub backdrop: Scene,
    pub workspace: Scene,
    pub strips: Vec<Scene>,
    pub strip_parts: Vec<Option<SectionParts>>,
    pub chrome: Scene,
}

A frame’s sections as layers, bottom to top, in scene pixels. Drawing them over each other in order (source over) gives the frame’s scene (compose), so a presenter can rasterize each into its own retained buffer and composite the buffers: a strip’s pan then moves that strip’s pixels over a backdrop and chrome that stay put, without drawing any of them again.

Fields

backdrop: Scene

Anything drawn behind every strip.

workspace: Scene

What no strip carries, in place, below the strips.

strips: Vec<Scene>

Each strip on screen, top to bottom, drawn on its own in canvas coordinates: shown inside its FrameCache::strips destination, read at its pan. Strips whose drawings meet (each draws its shadows past its row) each draw over the other there, as on screen.

strip_parts: Vec<Option<SectionParts>>

The damage parts each of strips marked, in the same order, so a presenter rasterises only where a part’s drawing changed. None for a strip drawn without well-nested parts.

chrome: Scene

Everything above the strips.

Trait Implementations

impl Clone for FrameLayers

fn clone(&self) -> FrameLayers

Returns a duplicate of the value.

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

Performs copy-assignment from source.