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* Previous PR: #3951 * Closes #4489 --------- Co-authored-by: Emil Ernerfeldt <emil.ernerfeldt@gmail.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,134 @@ | ||
| use egui::{ | ||
| ahash::HashMap, | ||
| decode_gif_uri, has_gif_magic_header, | ||
| load::{BytesPoll, ImageLoadResult, ImageLoader, ImagePoll, LoadError, SizeHint}, | ||
| mutex::Mutex, | ||
| ColorImage, GifFrameDurations, Id, | ||
| }; | ||
| use image::AnimationDecoder as _; | ||
| use std::{io::Cursor, mem::size_of, sync::Arc, time::Duration}; | ||
|
|
||
| /// Array of Frames and the duration for how long each frame should be shown | ||
| #[derive(Debug, Clone)] | ||
| pub struct AnimatedImage { | ||
| frames: Vec<Arc<ColorImage>>, | ||
| frame_durations: GifFrameDurations, | ||
| } | ||
|
|
||
| impl AnimatedImage { | ||
| fn load_gif(data: &[u8]) -> Result<Self, String> { | ||
| let decoder = image::codecs::gif::GifDecoder::new(Cursor::new(data)) | ||
| .map_err(|err| format!("Failed to decode gif: {err}"))?; | ||
| let mut images = vec![]; | ||
| let mut durations = vec![]; | ||
| for frame in decoder.into_frames() { | ||
| let frame = frame.map_err(|err| format!("Failed to decode gif: {err}"))?; | ||
| let img = frame.buffer(); | ||
| let pixels = img.as_flat_samples(); | ||
|
|
||
| let delay: Duration = frame.delay().into(); | ||
| images.push(Arc::new(ColorImage::from_rgba_unmultiplied( | ||
| [img.width() as usize, img.height() as usize], | ||
| pixels.as_slice(), | ||
| ))); | ||
| durations.push(delay); | ||
| } | ||
| Ok(Self { | ||
| frames: images, | ||
| frame_durations: GifFrameDurations(Arc::new(durations)), | ||
| }) | ||
| } | ||
| } | ||
|
|
||
| impl AnimatedImage { | ||
| pub fn byte_len(&self) -> usize { | ||
| size_of::<Self>() | ||
| + self | ||
| .frames | ||
| .iter() | ||
| .map(|image| { | ||
| image.pixels.len() * size_of::<egui::Color32>() + size_of::<Duration>() | ||
| }) | ||
| .sum::<usize>() | ||
| } | ||
|
|
||
| /// Gets image at index | ||
| pub fn get_image(&self, index: usize) -> Arc<ColorImage> { | ||
| self.frames[index % self.frames.len()].clone() | ||
| } | ||
| } | ||
| type Entry = Result<Arc<AnimatedImage>, String>; | ||
|
|
||
| #[derive(Default)] | ||
| pub struct GifLoader { | ||
| cache: Mutex<HashMap<String, Entry>>, | ||
| } | ||
|
|
||
| impl GifLoader { | ||
| pub const ID: &'static str = egui::generate_loader_id!(GifLoader); | ||
| } | ||
|
|
||
| impl ImageLoader for GifLoader { | ||
| fn id(&self) -> &str { | ||
| Self::ID | ||
| } | ||
|
|
||
| fn load(&self, ctx: &egui::Context, frame_uri: &str, _: SizeHint) -> ImageLoadResult { | ||
| let (image_uri, frame_index) = | ||
| decode_gif_uri(frame_uri).map_err(|_err| LoadError::NotSupported)?; | ||
| let mut cache = self.cache.lock(); | ||
| if let Some(entry) = cache.get(image_uri).cloned() { | ||
| match entry { | ||
| Ok(image) => Ok(ImagePoll::Ready { | ||
| image: image.get_image(frame_index), | ||
| }), | ||
| Err(err) => Err(LoadError::Loading(err)), | ||
| } | ||
| } else { | ||
| match ctx.try_load_bytes(image_uri) { | ||
| Ok(BytesPoll::Ready { bytes, .. }) => { | ||
| if !has_gif_magic_header(&bytes) { | ||
| return Err(LoadError::NotSupported); | ||
| } | ||
| log::trace!("started loading {image_uri:?}"); | ||
| let result = AnimatedImage::load_gif(&bytes).map(Arc::new); | ||
| if let Ok(v) = &result { | ||
| ctx.data_mut(|data| { | ||
| *data.get_temp_mut_or_default(Id::new(image_uri)) = | ||
| v.frame_durations.clone(); | ||
| }); | ||
| } | ||
| log::trace!("finished loading {image_uri:?}"); | ||
| cache.insert(image_uri.into(), result.clone()); | ||
| match result { | ||
| Ok(image) => Ok(ImagePoll::Ready { | ||
| image: image.get_image(frame_index), | ||
| }), | ||
| Err(err) => Err(LoadError::Loading(err)), | ||
| } | ||
| } | ||
| Ok(BytesPoll::Pending { size }) => Ok(ImagePoll::Pending { size }), | ||
| Err(err) => Err(err), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| fn forget(&self, uri: &str) { | ||
| let _ = self.cache.lock().remove(uri); | ||
| } | ||
|
|
||
| fn forget_all(&self) { | ||
| self.cache.lock().clear(); | ||
| } | ||
|
|
||
| fn byte_size(&self) -> usize { | ||
| self.cache | ||
| .lock() | ||
| .values() | ||
| .map(|v| match v { | ||
| Ok(v) => v.byte_len(), | ||
| Err(e) => e.len(), | ||
| }) | ||
| .sum() | ||
| } | ||
| } |
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