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//! Load and draw vector graphics.
use crate::{Hasher, Rectangle};
use std::hash::{Hash, Hasher as _};
use std::path::PathBuf;
use std::sync::Arc;
/// An [`Svg`] handle.
#[derive(Debug, Clone)]
pub struct Handle {
id: u64,
data: Arc<Data>,
}
impl Handle {
/// Creates an SVG [`Handle`] pointing to the vector image of the given
/// path.
pub fn from_path(path: impl Into<PathBuf>) -> Handle {
Self::from_data(Data::Path(path.into()))
}
/// Creates an SVG [`Handle`] from raw bytes containing either an SVG string
/// or gzip compressed data.
///
/// This is useful if you already have your SVG data in-memory, maybe
/// because you downloaded or generated it procedurally.
pub fn from_memory(bytes: impl Into<Vec<u8>>) -> Handle {
Self::from_data(Data::Bytes(bytes.into()))
}
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 SVG [`Data`].
pub fn data(&self) -> &Data {
&self.data
}
}
impl Hash for Handle {
fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
self.id.hash(state);
}
}
/// The data of an [`Svg`].
#[derive(Clone, Hash)]
pub enum Data {
/// File data
Path(PathBuf),
/// In-memory data
///
/// Can contain an SVG string or a gzip compressed data.
Bytes(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(...)"),
}
}
}
/// A [`Renderer`] that can render vector graphics.
///
/// [renderer]: crate::renderer
pub trait Renderer: crate::Renderer {
/// Returns the default dimensions of an SVG for the given [`Handle`].
fn dimensions(&self, handle: &Handle) -> (u32, u32);
/// Draws an SVG with the given [`Handle`] and inside the provided `bounds`.
fn draw(&mut self, handle: Handle, bounds: Rectangle);
}
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