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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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12
components/shared/webrender/display_list.rs
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@ -305,6 +305,15 @@ pub struct CompositorDisplayListInfo {
/// The `ScrollTreeNodeId` of the topmost scrolling frame of this info's scroll
/// tree.
pub root_scroll_node_id: ScrollTreeNodeId,
/// Contentful paint i.e. whether the display list contains items of type
/// text, image, non-white canvas or SVG). Used by metrics.
/// See <https://w3c.github.io/paint-timing/#first-contentful-paint>.
pub is_contentful: bool,
/// Whether the first layout or a subsequent (incremental) layout triggered this
/// display list creation.
pub first_reflow: bool,
}
impl CompositorDisplayListInfo {
@ -316,6 +325,7 @@ impl CompositorDisplayListInfo {
pipeline_id: PipelineId,
epoch: Epoch,
viewport_scroll_sensitivity: AxesScrollSensitivity,
first_reflow: bool,
) -> Self {
let mut scroll_tree = ScrollTree::default();
let root_reference_frame_id = scroll_tree.add_scroll_tree_node(
@ -343,6 +353,8 @@ impl CompositorDisplayListInfo {
scroll_tree,
root_reference_frame_id,
root_scroll_node_id,
is_contentful: false,
first_reflow,
}
}