66d80e2519
* Move texture allocation into epaint/egui proper * Add TextureHandle * egui_glow: cast using bytemuck instead of unsafe code * Optimize glium painter * Optimize WebGL * Add example of loading an image from file
46 lines
1.4 KiB
Rust
46 lines
1.4 KiB
Rust
#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")] // hide console window on Windows in release
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use eframe::{egui, epi};
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#[derive(Default)]
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struct MyApp {
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texture: Option<egui::TextureHandle>,
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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::Context, _frame: &epi::Frame) {
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let texture: &egui::TextureHandle = self.texture.get_or_insert_with(|| {
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let image = load_image(include_bytes!("rust-logo-256x256.png")).unwrap();
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ctx.load_texture("rust-logo", image)
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});
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egui::CentralPanel::default().show(ctx, |ui| {
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ui.heading("This is an image:");
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ui.image(texture, texture.size_vec2());
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ui.heading("This is an image you can click:");
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ui.add(egui::ImageButton::new(texture, texture.size_vec2()));
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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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fn load_image(image_data: &[u8]) -> Result<egui::ColorImage, image::ImageError> {
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use image::GenericImageView as _;
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let image = image::load_from_memory(image_data)?;
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let size = [image.width() as _, image.height() as _];
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let image_buffer = image.to_rgba8();
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let pixels = image_buffer.as_flat_samples();
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Ok(egui::ColorImage::from_rgba_unmultiplied(
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size,
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pixels.as_slice(),
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))
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}
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