Trait Compositor

Source

pub trait Compositor<D: DrawTarget<Color = Rgb565>> {
    // Required method
    fn plot(
        target: &mut D,
        x: i32,
        y: i32,
        color: Rgb565,
        opacity: u8,
        blend: BlendMode,
        backdrop: Rgb565,
    ) -> Result<(), D::Error>;
}

Expand description

Pixel-plotting policy for a RenderCtx. Selected by the ctx’s C type parameter so the same drawing calls composite differently depending on the target’s capabilities — with no runtime branch and no specialization.

Dither (the default) approximates translucency with ordered dithering and works on any write-only DrawTarget.
Blend performs true per-pixel alpha compositing and requires a readback-capable target (PixelRead), e.g. a Framebuffer.

plot receives screen-space coords already transformed and clipped, the layer-combined opacity, and the active layer blend mode + backdrop.