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Texture loading in egui (#1110)

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* 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
This commit is contained in:
Emil Ernerfeldt
2022-01-15 13:59:52 +01:00
committed by GitHub
parent 6c616a1b69
commit 66d80e2519
59 changed files with 1297 additions and 860 deletions
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45
eframe/examples/image.rs
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@@ -4,7 +4,7 @@ use eframe::{egui, epi};
#[derive(Default)]
struct MyApp {
texture: Option<(egui::Vec2, egui::TextureId)>,
texture: Option<egui::TextureHandle>,
}
impl epi::App for MyApp {
@@ -12,31 +12,18 @@ impl epi::App for MyApp {
"Show an image with eframe/egui"
}
fn update(&mut self, ctx: &egui::Context, frame: &epi::Frame) {
if self.texture.is_none() {
// Load the image:
let image_data = include_bytes!("rust-logo-256x256.png");
use image::GenericImageView;
let image = image::load_from_memory(image_data).expect("Failed to load image");
let image_buffer = image.to_rgba8();
let size = [image.width() as usize, image.height() as usize];
let pixels = image_buffer.into_vec();
let image = epi::Image::from_rgba_unmultiplied(size, &pixels);
// Allocate a texture:
let texture = frame.alloc_texture(image);
let size = egui::Vec2::new(size[0] as f32, size[1] as f32);
self.texture = Some((size, texture));
}
fn update(&mut self, ctx: &egui::Context, _frame: &epi::Frame) {
let texture: &egui::TextureHandle = self.texture.get_or_insert_with(|| {
let image = load_image(include_bytes!("rust-logo-256x256.png")).unwrap();
ctx.load_texture("rust-logo", image)
});
egui::CentralPanel::default().show(ctx, |ui| {
if let Some((size, texture)) = self.texture {
ui.heading("This is an image:");
ui.image(texture, size);
ui.heading("This is an image:");
ui.image(texture, texture.size_vec2());
ui.heading("This is an image you can click:");
ui.add(egui::ImageButton::new(texture, size));
}
ui.heading("This is an image you can click:");
ui.add(egui::ImageButton::new(texture, texture.size_vec2()));
});
}
}
@@ -45,3 +32,15 @@ fn main() {
let options = eframe::NativeOptions::default();
eframe::run_native(Box::new(MyApp::default()), options);
}
fn load_image(image_data: &[u8]) -> Result<egui::ColorImage, image::ImageError> {
use image::GenericImageView as _;
let image = image::load_from_memory(image_data)?;
let size = [image.width() as _, image.height() as _];
let image_buffer = image.to_rgba8();
let pixels = image_buffer.as_flat_samples();
Ok(egui::ColorImage::from_rgba_unmultiplied(
size,
pixels.as_slice(),
))
}