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//! Load and draw raster graphics.
use crate::{Hasher, Rectangle};
use std::hash::{Hash, Hasher as _};
use std::path::PathBuf;
use std::sync::Arc;
/// An [`Image`] handle.
#[derive(Debug, Clone)]
pub struct Handle {
id: u64,
data: Arc<Data>,
}
impl Handle {
/// Creates an image [`Handle`] pointing to the image of the given path.
///
/// Makes an educated guess about the image format by examining the data in the file.
pub fn from_path<T: Into<PathBuf>>(path: T) -> Handle {
Self::from_data(Data::Path(path.into()))
}
/// Creates an image [`Handle`] containing the image pixels directly. This
/// function expects the input data to be provided as a `Vec<u8>` of BGRA
/// pixels.
///
/// This is useful if you have already decoded your image.
pub fn from_pixels(width: u32, height: u32, pixels: Vec<u8>) -> Handle {
Self::from_data(Data::Pixels {
width,
height,
pixels,
})
}
/// Creates an image [`Handle`] containing the image data directly.
///
/// Makes an educated guess about the image format by examining the given data.
///
/// This is useful if you already have your image loaded in-memory, maybe
/// because you downloaded or generated it procedurally.
pub fn from_memory(bytes: Vec<u8>) -> Handle {
Self::from_data(Data::Bytes(bytes))
}
fn from_data(data: Data) -> Handle {
let mut hasher = Hasher::default();
data.hash(&mut hasher);
Handle {
id: hasher.finish(),
data: Arc::new(data),
}
}
/// Returns the unique identifier of the [`Handle`].
pub fn id(&self) -> u64 {
self.id
}
/// Returns a reference to the image [`Data`].
pub fn data(&self) -> &Data {
&self.data
}
}
impl<T> From<T> for Handle
where
T: Into<PathBuf>,
{
fn from(path: T) -> Handle {
Handle::from_path(path.into())
}
}
impl Hash for Handle {
fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
self.id.hash(state);
}
}
/// The data of an [`Image`].
#[derive(Clone, Hash)]
pub enum Data {
/// File data
Path(PathBuf),
/// In-memory data
Bytes(Vec<u8>),
/// Decoded image pixels in BGRA format.
Pixels {
/// The width of the image.
width: u32,
/// The height of the image.
height: u32,
/// The pixels.
pixels: Vec<u8>,
},
}
impl std::fmt::Debug for Data {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
Data::Path(path) => write!(f, "Path({:?})", path),
Data::Bytes(_) => write!(f, "Bytes(...)"),
Data::Pixels { width, height, .. } => {
write!(f, "Pixels({} * {})", width, height)
}
}
}
}
/// A [`Renderer`] that can render raster graphics.
///
/// [renderer]: crate::renderer
pub trait Renderer: crate::Renderer {
/// The image Handle to be displayed. Iced exposes its own default implementation of a [`Handle`]
///
/// [`Handle`]: Self::Handle
type Handle: Clone + Hash;
/// Returns the dimensions of an image for the given [`Handle`].
fn dimensions(&self, handle: &Self::Handle) -> (u32, u32);
/// Draws an image with the given [`Handle`] and inside the provided
/// `bounds`.
fn draw(&mut self, handle: Self::Handle, bounds: Rectangle);
}
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