vendor

egui/examples/screenshot/Cargo.toml

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+[package]
+name = "screenshot"
+version = "0.1.0"
+authors = [
+    "René Rössler <rene@freshx.de>",
+    "Andreas Faber <andreas.mfaber@gmail.com",
+]
+license = "MIT OR Apache-2.0"
+edition = "2021"
+rust-version = "1.65"
+publish = false
+
+
+[dependencies]
+eframe = { path = "../../crates/eframe", features = [
+    "__screenshot", # __screenshot is so we can dump a screenshot using EFRAME_SCREENSHOT_TO
+    "wgpu",
+] }
+itertools = "0.10.3"
+image = { version = "0.24", default-features = false, features = ["png"] }

egui/examples/screenshot/README.md

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+Example how to take screenshots and display them with eframe/egui.
+
+```sh
+cargo run -p screenshot
+```
+
+![](screenshot.png)

egui/examples/screenshot/src/main.rs

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+#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")] // hide console window on Windows in release
+
+use eframe::egui::{self, ColorImage};
+
+fn main() -> Result<(), eframe::Error> {
+    let options = eframe::NativeOptions {
+        renderer: eframe::Renderer::Wgpu,
+        ..Default::default()
+    };
+    eframe::run_native(
+        "Take screenshots and display with eframe/egui",
+        options,
+        Box::new(|_cc| Box::new(MyApp::default())),
+    )
+}
+
+#[derive(Default)]
+struct MyApp {
+    continuously_take_screenshots: bool,
+    texture: Option<egui::TextureHandle>,
+    screenshot: Option<ColorImage>,
+    save_to_file: bool,
+}
+
+impl eframe::App for MyApp {
+    fn update(&mut self, ctx: &egui::Context, frame: &mut eframe::Frame) {
+        egui::CentralPanel::default().show(ctx, |ui| {
+            if let Some(screenshot) = self.screenshot.take() {
+                self.texture = Some(ui.ctx().load_texture(
+                    "screenshot",
+                    screenshot,
+                    Default::default(),
+                ));
+            }
+
+            ui.horizontal(|ui| {
+                ui.checkbox(
+                    &mut self.continuously_take_screenshots,
+                    "continuously take screenshots",
+                );
+
+                if ui.button("save to 'top_left.png'").clicked() {
+                    self.save_to_file = true;
+                    frame.request_screenshot();
+                }
+
+                ui.with_layout(egui::Layout::top_down(egui::Align::RIGHT), |ui| {
+                    if self.continuously_take_screenshots {
+                        if ui
+                            .add(egui::Label::new("hover me!").sense(egui::Sense::hover()))
+                            .hovered()
+                        {
+                            ctx.set_visuals(egui::Visuals::dark());
+                        } else {
+                            ctx.set_visuals(egui::Visuals::light());
+                        };
+                        frame.request_screenshot();
+                    } else if ui.button("take screenshot!").clicked() {
+                        frame.request_screenshot();
+                    }
+                });
+            });
+
+            if let Some(texture) = self.texture.as_ref() {
+                ui.image(texture, ui.available_size());
+            } else {
+                ui.spinner();
+            }
+
+            ctx.request_repaint();
+        });
+    }
+
+    fn post_rendering(&mut self, _window_size: [u32; 2], frame: &eframe::Frame) {
+        if let Some(screenshot) = frame.screenshot() {
+            if self.save_to_file {
+                let pixels_per_point = frame.info().native_pixels_per_point;
+                let region =
+                    egui::Rect::from_two_pos(egui::Pos2::ZERO, egui::Pos2 { x: 100., y: 100. });
+                let top_left_corner = screenshot.region(&region, pixels_per_point);
+                image::save_buffer(
+                    "top_left.png",
+                    top_left_corner.as_raw(),
+                    top_left_corner.width() as u32,
+                    top_left_corner.height() as u32,
+                    image::ColorType::Rgba8,
+                )
+                .unwrap();
+                self.save_to_file = false;
+            }
+            self.screenshot = Some(screenshot);
+        }
+    }
+}