use crate::{    App, Bounds, Element, ElementId, GlobalElementId, IntoElement, LayoutId, ObjectFit, Pixels,    Style, StyleRefinement, Styled, Window,};#[cfg(target_os = "macos")]use core_video::pixel_buffer::CVPixelBuffer;use refineable::Refineable; /// A source of a surface's content.#[derive(Clone, Debug, PartialEq, Eq)]pub enum SurfaceSource {    /// A macOS image buffer from CoreVideo    #[cfg(target_os = "macos")]    Surface(CVPixelBuffer),} #[cfg(target_os = "macos")]impl From<CVPixelBuffer> for SurfaceSource {    fn from(value: CVPixelBuffer) -> Self {        SurfaceSource::Surface(value)    }} /// A surface element.pub struct Surface {    source: SurfaceSource,    object_fit: ObjectFit,    style: StyleRefinement,} /// Create a new surface element.pub fn surface(source: impl Into<SurfaceSource>) -> Surface {    Surface {        source: source.into(),        object_fit: ObjectFit::Contain,        style: Default::default(),    }} impl Surface {    /// Set the object fit for the image.    pub fn object_fit(mut self, object_fit: ObjectFit) -> Self {        self.object_fit = object_fit;        self    }} impl Element for Surface {    type RequestLayoutState = ();    type PrepaintState = ();     fn id(&self) -> Option<ElementId> {        None    }     fn request_layout(        &mut self,        _global_id: Option<&GlobalElementId>,        window: &mut Window,        cx: &mut App,    ) -> (LayoutId, Self::RequestLayoutState) {        let mut style = Style::default();        style.refine(&self.style);        let layout_id = window.request_layout(style, [], cx);        (layout_id, ())    }     fn prepaint(        &mut self,        _global_id: Option<&GlobalElementId>,        _bounds: Bounds<Pixels>,        _request_layout: &mut Self::RequestLayoutState,        _window: &mut Window,        _cx: &mut App,    ) -> Self::PrepaintState {    }     fn paint(        &mut self,        _global_id: Option<&GlobalElementId>,        #[cfg_attr(not(target_os = "macos"), allow(unused_variables))] bounds: Bounds<Pixels>,        _: &mut Self::RequestLayoutState,        _: &mut Self::PrepaintState,        #[cfg_attr(not(target_os = "macos"), allow(unused_variables))] window: &mut Window,        _: &mut App,    ) {        match &self.source {            #[cfg(target_os = "macos")]            SurfaceSource::Surface(surface) => {                let size = crate::size(surface.get_width().into(), surface.get_height().into());                let new_bounds = self.object_fit.get_bounds(bounds, size);                // TODO: Add support for corner_radii                window.paint_surface(new_bounds, surface.clone());            }            #[allow(unreachable_patterns)]            _ => {}        }    }} impl IntoElement for Surface {    type Element = Self;     fn into_element(self) -> Self::Element {        self    }} impl Styled for Surface {    fn style(&mut self) -> &mut StyleRefinement {        &mut self.style    }}