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layout: Remove the obsolete layout tracing functionality (#35001)

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There were two kinds of layout tracing controlled by the same debugging
option:

 - modern layout: Functionality that dumped a JSON serialization of the
   layout tree before and after layout.
 - legacy layout: A scope based tracing that reported the process of
   layout in a structured way.

I don't think anyone working on layout is using either of these two
features. For modern layout requiring data structure to implement
`serde` serialization is incredibly inconvenient and also generates a
lot of extra code.

We also have a more modern tracing functionality based on perfetto that
we have started to use for layout and IMO it's actually being used and
more robust.

Signed-off-by: Martin Robinson <mrobinson@igalia.com>
This commit is contained in:
Martin Robinson 2025-01-15 14:24:14 +01:00 • committed by GitHub
parent 2cd5e1356c
commit e81951a973
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45 changed files with 64 additions and 675 deletions
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10
components/layout_2020/flexbox/mod.rs
View file

@ -4,7 +4,6 @@
use app_units::Au;
use geom::{FlexAxis, MainStartCrossStart};
use serde::Serialize;
use servo_arc::Arc as ServoArc;
use style::logical_geometry::WritingMode;
use style::properties::longhands::align_items::computed_value::T as AlignItems;
@ -30,7 +29,7 @@ mod layout;
/// A structure to hold the configuration of a flex container for use during layout
/// and preferred width calculation.
#[derive(Clone, Debug, Serialize)]
#[derive(Clone, Debug)]
pub(crate) struct FlexContainerConfig {
container_is_single_line: bool,
writing_mode: WritingMode,
@ -88,11 +87,10 @@ impl FlexContainerConfig {
}
}
#[derive(Debug, Serialize)]
#[derive(Debug)]
pub(crate) struct FlexContainer {
children: Vec<ArcRefCell<FlexLevelBox>>,
#[serde(skip_serializing)]
style: ServoArc<ComputedValues>,
/// The configuration of this [`FlexContainer`].
@ -143,16 +141,14 @@ impl FlexContainer {
}
}
#[derive(Debug, Serialize)]
#[derive(Debug)]
pub(crate) enum FlexLevelBox {
FlexItem(FlexItemBox),
OutOfFlowAbsolutelyPositionedBox(ArcRefCell<AbsolutelyPositionedBox>),
}
#[derive(Serialize)]
pub(crate) struct FlexItemBox {
independent_formatting_context: IndependentFormattingContext,
#[serde(skip)]
block_content_size_cache: ArcRefCell<Option<CachedBlockSizeContribution>>,
}