Struct RendererTarget 

pub struct RendererTarget<'a> {
    pub window_handle: Option<RawWindowHandle>,
    pub display_handle: Option<RawDisplayHandle>,
    pub size: Size<Pixels>,
    pub scale_factor: f32,
    pub transparent: bool,
    pub backend: Option<&'a (dyn Any + 'static)>,
}

What a renderer is built against: the window’s handles, its geometry, and whatever the backend needs to add.

The handles are typed rather than erased, because erasing them would make any renderer that is not the backend’s own downcast to the backend’s target type — which means depending on the backend crate. The backend’s own extras are the one erased field.

Fields

window_handle: Option<RawWindowHandle>

The window’s raw handle, which the renderer builds its surface from.

display_handle: Option<RawDisplayHandle>

The display the window is on, for the same.

size: Size<Pixels>

The window’s size, in logical pixels.

scale_factor: f32

The ratio between logical pixels and device pixels.

transparent: bool

Whether the window is transparent.

backend: Option<&'a (dyn Any + 'static)>

Backend-specific extras, for that backend’s own renderer only. Any is 'static, so this must point at owned data; a backend with nothing to add passes None.