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//! A compositor is responsible for initializing a renderer and managing window
//! surfaces.
use crate::{Error, Viewport};
use iced_core::Color;
use raw_window_handle::{HasRawDisplayHandle, HasRawWindowHandle};
use thiserror::Error;
/// A graphics compositor that can draw to windows.
pub trait Compositor: Sized {
/// The settings of the backend.
type Settings: Default;
/// The iced renderer of the backend.
type Renderer: iced_core::Renderer;
/// The surface of the backend.
type Surface;
/// Creates a new [`Compositor`].
fn new<W: HasRawWindowHandle + HasRawDisplayHandle>(
settings: Self::Settings,
compatible_window: Option<&W>,
) -> Result<(Self, Self::Renderer), Error>;
/// Crates a new [`Surface`] for the given window.
///
/// [`Surface`]: Self::Surface
fn create_surface<W: HasRawWindowHandle + HasRawDisplayHandle>(
&mut self,
window: &W,
width: u32,
height: u32,
) -> Self::Surface;
/// Configures a new [`Surface`] with the given dimensions.
///
/// [`Surface`]: Self::Surface
fn configure_surface(
&mut self,
surface: &mut Self::Surface,
width: u32,
height: u32,
);
/// Returns [`Information`] used by this [`Compositor`].
fn fetch_information(&self) -> Information;
/// Presents the [`Renderer`] primitives to the next frame of the given [`Surface`].
///
/// [`Renderer`]: Self::Renderer
/// [`Surface`]: Self::Surface
fn present<T: AsRef<str>>(
&mut self,
renderer: &mut Self::Renderer,
surface: &mut Self::Surface,
viewport: &Viewport,
background_color: Color,
overlay: &[T],
) -> Result<(), SurfaceError>;
/// Screenshots the current [`Renderer`] primitives to an offscreen texture, and returns the bytes of
/// the texture ordered as `RGBA` in the sRGB color space.
///
/// [`Renderer`]: Self::Renderer
fn screenshot<T: AsRef<str>>(
&mut self,
renderer: &mut Self::Renderer,
surface: &mut Self::Surface,
viewport: &Viewport,
background_color: Color,
overlay: &[T],
) -> Vec<u8>;
}
/// Result of an unsuccessful call to [`Compositor::present`].
#[derive(Clone, PartialEq, Eq, Debug, Error)]
pub enum SurfaceError {
/// A timeout was encountered while trying to acquire the next frame.
#[error(
"A timeout was encountered while trying to acquire the next frame"
)]
Timeout,
/// The underlying surface has changed, and therefore the surface must be updated.
#[error(
"The underlying surface has changed, and therefore the surface must be updated."
)]
Outdated,
/// The swap chain has been lost and needs to be recreated.
#[error("The surface has been lost and needs to be recreated")]
Lost,
/// There is no more memory left to allocate a new frame.
#[error("There is no more memory left to allocate a new frame")]
OutOfMemory,
}
/// Contains information about the graphics (e.g. graphics adapter, graphics backend).
#[derive(Debug)]
pub struct Information {
/// Contains the graphics adapter.
pub adapter: String,
/// Contains the graphics backend.
pub backend: String,
}
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