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compositor: Batch all pending scroll event updates into a single transaction (#36974)

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When multiple WebViews are updating scroll events, instead of taking the
list of `WebView`s to avoid a double-borrow, batch scroll events into a
single transaction. This should make processing slightly more efficient
and avoids having to take the vector of WebViews.

Testing: No behavior change here and this aspect of WebView interaction
is untestable currently.

Signed-off-by: Martin Robinson <mrobinson@igalia.com>
This commit is contained in:
Martin Robinson 2025-05-16 20:26:59 +02:00 • committed by GitHub
parent 639eb7bc55
commit c1a70f4eb2
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4 changed files with 75 additions and 38 deletions
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39
components/compositing/compositor.rs
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@ -7,7 +7,6 @@ use std::collections::HashMap;
use std::env;
use std::fs::create_dir_all;
use std::iter::once;
use std::mem::take;
use std::rc::Rc;
use std::sync::Arc;
use std::time::{Duration, Instant, SystemTime, UNIX_EPOCH};
@ -55,7 +54,7 @@ use webrender_api::{
use crate::InitialCompositorState;
use crate::webview_manager::WebViewManager;
use crate::webview_renderer::{UnknownWebView, WebViewRenderer};
use crate::webview_renderer::{PinchZoomResult, UnknownWebView, WebViewRenderer};
#[derive(Debug, PartialEq)]
enum UnableToComposite {
@ -1668,11 +1667,39 @@ impl IOCompositor {
if let Err(err) = self.rendering_context.make_current() {
warn!("Failed to make the rendering context current: {:?}", err);
}
let mut webview_renderers = take(&mut self.webview_renderers);
for webview_renderer in webview_renderers.iter_mut() {
webview_renderer.process_pending_scroll_events(self);
let mut need_zoom = false;
let scroll_offset_updates: Vec<_> = self
.webview_renderers
.iter_mut()
.filter_map(|webview_renderer| {
let (zoom, scroll_result) =
webview_renderer.process_pending_scroll_and_pinch_zoom_events();
need_zoom = need_zoom || (zoom == PinchZoomResult::DidPinchZoom);
scroll_result
})
.collect();
if need_zoom || !scroll_offset_updates.is_empty() {
let mut transaction = Transaction::new();
if need_zoom {
self.send_root_pipeline_display_list_in_transaction(&mut transaction);
}
for update in scroll_offset_updates {
let offset = LayoutVector2D::new(-update.offset.x, -update.offset.y);
transaction.set_scroll_offsets(
update.external_scroll_id,
vec![SampledScrollOffset {
offset,
generation: 0,
}],
);
}
self.generate_frame(&mut transaction, RenderReasons::APZ);
self.global.borrow_mut().send_transaction(transaction);
}
self.webview_renderers = webview_renderers;
self.global.borrow().shutdown_state() != ShutdownState::FinishedShuttingDown
}