47 lines
1.5 KiB
Rust
47 lines
1.5 KiB
Rust
use eframe::{egui, epi};
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#[derive(Default)]
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struct MyApp {
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texture: Option<egui::TextureId>,
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}
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impl epi::App for MyApp {
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fn name(&self) -> &str {
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"Show an image with eframe/egui"
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}
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fn update(&mut self, ctx: &egui::CtxRef, frame: &mut epi::Frame<'_>) {
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if self.texture.is_none() {
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// Load the image:
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let image_data = include_bytes!("rust-logo-512x512.png");
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use image::GenericImageView;
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let image = image::load_from_memory(image_data).expect("Failed to load image");
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let image_buffer = image.to_rgba8();
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let size = (image.width() as usize, image.height() as usize);
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let pixels = image_buffer.into_vec();
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assert_eq!(size.0 * size.1 * 4, pixels.len());
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let pixels: Vec<_> = pixels
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.chunks_exact(4)
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.map(|p| egui::Color32::from_rgba_unmultiplied(p[0], p[1], p[2], p[3]))
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.collect();
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// Allocate a texture:
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let texture = frame
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.tex_allocator()
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.alloc_srgba_premultiplied(size, &pixels);
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self.texture = Some(texture);
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}
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egui::CentralPanel::default().show(ctx, |ui| {
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ui.heading("Here is an image for you:");
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if let Some(texture) = self.texture {
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ui.image(texture, egui::Vec2::splat(256.0));
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}
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});
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}
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}
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fn main() {
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let options = eframe::NativeOptions::default();
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eframe::run_native(Box::new(MyApp::default()), options);
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}
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