106 lines
2.6 KiB
Rust
106 lines
2.6 KiB
Rust
//! Load and draw vector graphics.
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use crate::{Color, Rectangle, Size};
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use rustc_hash::FxHasher;
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use std::borrow::Cow;
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use std::hash::{Hash, Hasher as _};
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use std::path::PathBuf;
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use std::sync::Arc;
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/// A handle of Svg data.
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#[derive(Debug, Clone, PartialEq, Eq)]
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pub struct Handle {
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id: u64,
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data: Arc<Data>,
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}
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impl Handle {
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/// Creates an SVG [`Handle`] pointing to the vector image of the given
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/// path.
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pub fn from_path(path: impl Into<PathBuf>) -> Handle {
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Self::from_data(Data::Path(path.into()))
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}
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/// Creates an SVG [`Handle`] from raw bytes containing either an SVG string
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/// or gzip compressed data.
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///
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/// This is useful if you already have your SVG data in-memory, maybe
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/// because you downloaded or generated it procedurally.
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pub fn from_memory(bytes: impl Into<Cow<'static, [u8]>>) -> Handle {
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Self::from_data(Data::Bytes(bytes.into()))
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}
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fn from_data(data: Data) -> Handle {
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let mut hasher = FxHasher::default();
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data.hash(&mut hasher);
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Handle {
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id: hasher.finish(),
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data: Arc::new(data),
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}
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}
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/// Returns the unique identifier of the [`Handle`].
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pub fn id(&self) -> u64 {
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self.id
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}
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/// Returns a reference to the SVG [`Data`].
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pub fn data(&self) -> &Data {
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&self.data
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}
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}
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impl<T> From<T> for Handle
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where
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T: Into<PathBuf>,
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{
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fn from(path: T) -> Handle {
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Handle::from_path(path.into())
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}
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}
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impl Hash for Handle {
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fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
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self.id.hash(state);
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}
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}
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/// The data of a vectorial image.
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#[derive(Clone, Hash, PartialEq, Eq)]
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pub enum Data {
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/// File data
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Path(PathBuf),
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/// In-memory data
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///
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/// Can contain an SVG string or a gzip compressed data.
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Bytes(Cow<'static, [u8]>),
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}
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impl std::fmt::Debug for Data {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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match self {
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Data::Path(path) => write!(f, "Path({path:?})"),
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Data::Bytes(_) => write!(f, "Bytes(...)"),
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}
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}
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}
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/// A [`Renderer`] that can render vector graphics.
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///
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/// [renderer]: crate::renderer
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pub trait Renderer: crate::Renderer {
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/// Returns the default dimensions of an SVG for the given [`Handle`].
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fn measure_svg(&self, handle: &Handle) -> Size<u32>;
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/// Draws an SVG with the given [`Handle`], an optional [`Color`] filter, and inside the provided `bounds`.
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fn draw_svg(
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&mut self,
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handle: Handle,
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color: Option<Color>,
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bounds: Rectangle,
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rotation: f32,
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scale: Size,
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);
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}
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