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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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30
components/constellation/tracing.rs
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@ -30,17 +30,6 @@ macro_rules! trace_script_msg {
};
}
/// Log an event from layout at trace level.
/// - To disable tracing: RUST_LOG='constellation<layout@=off'
/// - To enable tracing: RUST_LOG='constellation<layout@'
macro_rules! trace_layout_msg {
// This macro only exists to put the docs in the same file as the target prefix,
// so the macro definition is always the same.
($event:expr, $($rest:tt)+) => {
::log::trace!(target: $crate::tracing::LogTarget::log_target(&$event), $($rest)+)
};
}
/// Get the log target for an event, as a static string.
pub(crate) trait LogTarget {
fn log_target(&self) -> &'static str;
@ -87,6 +76,7 @@ mod from_compositor {
Self::MediaSessionAction(_) => target!("MediaSessionAction"),
Self::SetWebViewThrottled(_, _) => target!("SetWebViewThrottled"),
Self::SetScrollStates(..) => target!("SetScrollStates"),
Self::PaintMetric(..) => target!("PaintMetric"),
}
}
}
@ -249,21 +239,3 @@ mod from_script {
}
}
}
mod from_layout {
use super::LogTarget;
macro_rules! target {
($($name:literal)+) => {
concat!("constellation<layout@", $($name),+)
};
}
impl LogTarget for script_traits::LayoutMsg {
fn log_target(&self) -> &'static str {
match self {
Self::PendingPaintMetric(..) => target!("PendingPaintMetric"),
}
}
}
}