85 lines
2.5 KiB
Rust
85 lines
2.5 KiB
Rust
use egui::{
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ahash::HashMap,
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load::{BytesPoll, ImageLoadResult, ImageLoader, ImagePoll, LoadError, SizeHint},
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mutex::Mutex,
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ColorImage,
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};
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use std::{mem::size_of, path::Path, sync::Arc};
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type Entry = Result<Arc<ColorImage>, String>;
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#[derive(Default)]
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pub struct ImageCrateLoader {
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cache: Mutex<HashMap<String, Entry>>,
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}
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fn is_supported(uri: &str) -> bool {
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let Some(ext) = Path::new(uri).extension().and_then(|ext| ext.to_str()) else {
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// `true` because if there's no extension, assume that we support it
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return true
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};
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ext != "svg"
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}
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impl ImageLoader for ImageCrateLoader {
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fn load(&self, ctx: &egui::Context, uri: &str, _: SizeHint) -> ImageLoadResult {
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if !is_supported(uri) {
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return Err(LoadError::NotSupported);
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}
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let mut cache = self.cache.lock();
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if let Some(entry) = cache.get(uri).cloned() {
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match entry {
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Ok(image) => Ok(ImagePoll::Ready { image }),
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Err(err) => Err(LoadError::Custom(err)),
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}
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} else {
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match ctx.try_load_bytes(uri) {
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Ok(BytesPoll::Ready { bytes, .. }) => {
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crate::log_trace!("started loading {uri:?}");
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let result = crate::image::load_image_bytes(&bytes).map(Arc::new);
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crate::log_trace!("finished loading {uri:?}");
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cache.insert(uri.into(), result.clone());
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match result {
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Ok(image) => Ok(ImagePoll::Ready { image }),
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Err(err) => Err(LoadError::Custom(err)),
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}
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}
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Ok(BytesPoll::Pending { size }) => Ok(ImagePoll::Pending { size }),
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Err(err) => Err(err),
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}
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}
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}
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fn forget(&self, uri: &str) {
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let _ = self.cache.lock().remove(uri);
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}
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fn byte_size(&self) -> usize {
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self.cache
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.lock()
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.values()
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.map(|result| match result {
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Ok(image) => image.pixels.len() * size_of::<egui::Color32>(),
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Err(err) => err.len(),
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})
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.sum()
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn check_support() {
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assert!(is_supported("https://test.png"));
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assert!(is_supported("test.jpeg"));
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assert!(is_supported("http://test.gif"));
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assert!(is_supported("test.webp"));
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assert!(is_supported("file://test"));
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assert!(!is_supported("test.svg"));
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}
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}
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