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Add screenshot support for eframe web (#5438)

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This implements web support for taking screenshots in an eframe app (and
adds a nice demo).
It also updates the native screenshot implementation to work with the
wgpu gl backend.

The wgpu implementation is quite different than the native one because
we can't block to wait for the screenshot result, so instead I use a
channel to pass the result to a future frame asynchronously.

* Closes <https://github.com/emilk/egui/issues/5425>
* [x] I have followed the instructions in the PR template


https://github.com/user-attachments/assets/67cad40b-0384-431d-96a3-075cc3cb98fb
This commit is contained in:
lucasmerlin
2024-12-12 19:17:42 +01:00
committed by GitHub
parent de8ac88c0e
commit 6c1d695fc6
13 changed files with 613 additions and 272 deletions
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33
crates/eframe/src/web/app_runner.rs
View File

@@ -1,4 +1,5 @@
use egui::TexturesDelta;
use egui::{TexturesDelta, UserData, ViewportCommand};
use std::mem;
use crate::{epi, App};
@@ -16,6 +17,9 @@ pub struct AppRunner {
last_save_time: f64,
pub(crate) text_agent: TextAgent,
// If not empty, the painter should capture the next frame
screenshot_commands: Vec<UserData>,
// Output for the last run:
textures_delta: TexturesDelta,
clipped_primitives: Option<Vec<egui::ClippedPrimitive>>,
@@ -36,7 +40,8 @@ impl AppRunner {
app_creator: epi::AppCreator<'static>,
text_agent: TextAgent,
) -> Result<Self, String> {
let painter = super::ActiveWebPainter::new(canvas, &web_options).await?;
let egui_ctx = egui::Context::default();
let painter = super::ActiveWebPainter::new(egui_ctx.clone(), canvas, &web_options).await?;
let info = epi::IntegrationInfo {
web_info: epi::WebInfo {
@@ -47,7 +52,6 @@ impl AppRunner {
};
let storage = LocalStorage::default();
let egui_ctx = egui::Context::default();
egui_ctx.set_os(egui::os::OperatingSystem::from_user_agent(
&super::user_agent().unwrap_or_default(),
));
@@ -110,6 +114,7 @@ impl AppRunner {
needs_repaint,
last_save_time: now_sec(),
text_agent,
screenshot_commands: vec![],
textures_delta: Default::default(),
clipped_primitives: None,
};
@@ -205,6 +210,8 @@ impl AppRunner {
pub fn logic(&mut self) {
// We sometimes miss blur/focus events due to the text agent, so let's just poll each frame:
self.update_focus();
// We might have received a screenshot
self.painter.handle_screenshots(&mut self.input.raw.events);
let canvas_size = super::canvas_size_in_points(self.canvas(), self.egui_ctx());
let mut raw_input = self.input.new_frame(canvas_size);
@@ -225,12 +232,19 @@ impl AppRunner {
if viewport_output.len() > 1 {
log::warn!("Multiple viewports not yet supported on the web");
}
for viewport_output in viewport_output.values() {
for command in &viewport_output.commands {
// TODO(emilk): handle some of the commands
log::warn!(
"Unhandled egui viewport command: {command:?} - not implemented in web backend"
);
for (_viewport_id, viewport_output) in viewport_output {
for command in viewport_output.commands {
match command {
ViewportCommand::Screenshot(user_data) => {
self.screenshot_commands.push(user_data);
}
_ => {
// TODO(emilk): handle some of the commands
log::warn!(
"Unhandled egui viewport command: {command:?} - not implemented in web backend"
);
}
}
}
}
@@ -250,6 +264,7 @@ impl AppRunner {
&clipped_primitives,
self.egui_ctx.pixels_per_point(),
&textures_delta,
mem::take(&mut self.screenshot_commands),
) {
log::error!("Failed to paint: {}", super::string_from_js_value(&err));
}