Enum ExternalSource

pub enum ExternalSource {
    Texture(Arc<dyn Fn(&Context, Rect) -> Option<Texture> + Send + Sync>),
}

Backends an External widget can pull pixels from.

The only variant today is ExternalSource::Texture, a closure returning the current GL texture name. Future variants (DMA-BUF imports, software pixmaps for the CPU backend, …) can be added without changing call sites.

Variants

Texture(Arc<dyn Fn(&Context, Rect) -> Option<Texture> + Send + Sync>)

Closure invoked once per frame with LTK’s [glow::Context] current and the widget’s laid-out rect (in physical pixels of the host surface). The producer can allocate textures, bind extension- imported EGLImages, etc., and returns the texture name to sample. Returning None paints transparent — useful while the producer is still warming up its first frame. The rect is exposed so embedders can size their inner viewport to match LTK’s actual allocation (e.g. resize a WPEToplevel on layout change) and translate input coordinates by rect.origin.

Trait Implementations

impl Clone for ExternalSource

fn clone(&self) -> ExternalSource

Returns a copy of the value.

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

Performs copy-assignment from source.