1use crate::{size, DevicePixels, Result, SharedString, Size};
 2use anyhow::anyhow;
 3use image::{Bgra, ImageBuffer};
 4use std::{
 5    borrow::Cow,
 6    fmt,
 7    hash::Hash,
 8    sync::atomic::{AtomicUsize, Ordering::SeqCst},
 9};
10
11pub trait AssetSource: 'static + Send + Sync {
12    fn load(&self, path: &str) -> Result<Cow<[u8]>>;
13    fn list(&self, path: &str) -> Result<Vec<SharedString>>;
14}
15
16impl AssetSource for () {
17    fn load(&self, path: &str) -> Result<Cow<[u8]>> {
18        Err(anyhow!(
19            "get called on empty asset provider with \"{}\"",
20            path
21        ))
22    }
23
24    fn list(&self, _path: &str) -> Result<Vec<SharedString>> {
25        Ok(vec![])
26    }
27}
28
29#[derive(Copy, Clone, Debug, Eq, PartialEq, Ord, PartialOrd, Hash)]
30pub struct ImageId(usize);
31
32pub struct ImageData {
33    pub id: ImageId,
34    data: ImageBuffer<Bgra<u8>, Vec<u8>>,
35}
36
37impl ImageData {
38    pub fn new(data: ImageBuffer<Bgra<u8>, Vec<u8>>) -> Self {
39        static NEXT_ID: AtomicUsize = AtomicUsize::new(0);
40
41        Self {
42            id: ImageId(NEXT_ID.fetch_add(1, SeqCst)),
43            data,
44        }
45    }
46
47    pub fn as_bytes(&self) -> &[u8] {
48        &self.data
49    }
50
51    pub fn size(&self) -> Size<DevicePixels> {
52        let (width, height) = self.data.dimensions();
53        size(width.into(), height.into())
54    }
55}
56
57impl fmt::Debug for ImageData {
58    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
59        f.debug_struct("ImageData")
60            .field("id", &self.id)
61            .field("size", &self.data.dimensions())
62            .finish()
63    }
64}