tessera-components 0.0.0

Basic components for tessera-ui, using md3e design principles.
Documentation 
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//! Material Design icon content helpers.
//!
//! ## Usage
//!
//! Use style modules (e.g., [`filled`]) and functions like `home_icon()` to get
//! an [`IconContent`] that can be passed to [`crate::icon::IconArgs`].
use std::{collections::HashMap, sync::Arc};

use parking_lot::RwLock;

use crate::{
    icon::IconContent, image_vector::ImageVectorSource,
    pipelines::image_vector::command::ImageVectorData,
};

pub use generated::{ICON_BLOB, filled, outlined, round, sharp, two_tone};

#[allow(missing_docs, clippy::all)]
mod generated {
    include!(concat!(env!("OUT_DIR"), "/material_icons.rs"));
}

type IconCache = HashMap<(&'static str, u32, u32), Arc<ImageVectorData>>;

static ICON_CACHE: std::sync::OnceLock<RwLock<IconCache>> = std::sync::OnceLock::new();

fn cache() -> &'static RwLock<IconCache> {
    ICON_CACHE.get_or_init(|| RwLock::new(HashMap::new()))
}

/// Load vector data from the bundled blob with caching.
pub fn load_icon_bytes(style: &'static str, offset: u32, len: u32) -> Arc<ImageVectorData> {
    let key = (style, offset, len);
    if let Some(cached) = cache().read().get(&key) {
        return cached.clone();
    }

    let start = offset as usize;
    let end = start + len as usize;
    let bytes = Arc::<[u8]>::from(&ICON_BLOB[start..end]);
    let vector =
        crate::image_vector::load_image_vector_from_source(&ImageVectorSource::Bytes(bytes))
            .map(Arc::new)
            .expect("bundled material icon svg should load");

    cache().write().insert(key, vector.clone());
    vector
}

/// Convert loaded vector data into icon content.
pub fn content_from_data(data: Arc<ImageVectorData>) -> IconContent {
    IconContent::from(data)
}