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metrics: Simplify ProgressiveWebMetrics (#35985)

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Simply how `ProgressiveWebMetrics` works:

1. Keep only a single struct instead of one in layout and one script
   that both implement the `ProgressiveWebMetrics` trait. Since layout
   and script are the same thread these can now just be a single
   `ProgressiveWebMetrics` struct stored in script.
2. Have the compositor be responsible for informing the Constellation
   (which informs the ScripThread) about paint metrics. This makes
   communication flow one way and removes one dependency between the
   compositor and script (of two).
3. All units tests are moved into the `metrics` crate itself since there
   is only one struct there now.

Signed-off-by: Martin Robinson <mrobinson@igalia.com>
This commit is contained in:
Martin Robinson 2025-03-21 15:55:00 +01:00 • committed by GitHub
parent 1f232eb17c
commit 5424479768
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26 changed files with 416 additions and 787 deletions
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25
components/layout_thread_2020/lib.rs
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@ -16,7 +16,6 @@ use std::sync::{Arc, LazyLock};
use app_units::Au;
use base::Epoch;
use base::cross_process_instant::CrossProcessInstant;
use base::id::{PipelineId, WebViewId};
use embedder_traits::resources::{self, Resource};
use euclid::default::{Point2D as UntypedPoint2D, Rect as UntypedRect, Size2D as UntypedSize2D};
@ -37,7 +36,6 @@ use layout::traversal::RecalcStyle;
use layout::{BoxTree, FragmentTree};
use log::{debug, error};
use malloc_size_of::{MallocSizeOf, MallocSizeOfOps};
use metrics::{PaintTimeMetrics, ProfilerMetadataFactory};
use net_traits::image_cache::{ImageCache, UsePlaceholder};
use parking_lot::{Mutex, RwLock};
use profile_traits::mem::{Report, ReportKind};
@ -160,9 +158,6 @@ pub struct LayoutThread {
/// Cross-process access to the Compositor API.
compositor_api: CrossProcessCompositorApi,
/// Paint time metrics.
paint_time_metrics: PaintTimeMetrics,
/// Debug options, copied from configuration to this `LayoutThread` in order
/// to avoid having to constantly access the thread-safe global options.
debug: DebugOptions,
@ -462,10 +457,6 @@ impl Layout for LayoutThread {
.map(|scroll_state| (scroll_state.scroll_id, scroll_state.scroll_offset))
.collect();
}
fn set_epoch_paint_time(&mut self, epoch: Epoch, paint_time: CrossProcessInstant) {
self.paint_time_metrics.maybe_set_metric(epoch, paint_time);
}
}
impl LayoutThread {
@ -520,7 +511,6 @@ impl LayoutThread {
scroll_offsets: Default::default(),
stylist: Stylist::new(device, QuirksMode::NoQuirks),
webrender_image_cache: Default::default(),
paint_time_metrics: config.paint_time_metrics,
debug: opts::get().debug.clone(),
}
}
@ -856,6 +846,7 @@ impl LayoutThread {
self.id.into(),
epoch.into(),
fragment_tree.viewport_scroll_sensitivity,
self.first_reflow.get(),
);
display_list.wr.begin();
@ -874,7 +865,7 @@ impl LayoutThread {
display_list.build_stacking_context_tree(&fragment_tree, &self.debug);
// Build the rest of the display list which inclues all of the WebRender primitives.
let is_contentful = display_list.build(context, &fragment_tree, &root_stacking_context);
display_list.build(context, &fragment_tree, &root_stacking_context);
if self.debug.dump_flow_tree {
fragment_tree.print();
@ -884,12 +875,6 @@ impl LayoutThread {
}
debug!("Layout done!");
// Observe notifications about rendered frames if needed right before
// sending the display list to WebRender in order to set time related
// Progressive Web Metrics.
self.paint_time_metrics
.maybe_observe_paint_time(self, epoch, is_contentful);
if reflow_goal.needs_display() {
self.compositor_api.send_display_list(
self.webview_id,
@ -991,12 +976,6 @@ impl LayoutThread {
}
}
impl ProfilerMetadataFactory for LayoutThread {
fn new_metadata(&self) -> Option<TimerMetadata> {
self.profiler_metadata()
}
}
fn get_ua_stylesheets() -> Result<UserAgentStylesheets, &'static str> {
fn parse_ua_stylesheet(
shared_lock: &SharedRwLock,