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

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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GPG key ID: B5690EEEBB952194
45 changed files with 64 additions and 675 deletions

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@ -44,7 +44,6 @@ use crate::data::{InnerLayoutData, LayoutData, LayoutDataFlags};
pub trait ThreadSafeLayoutNodeHelpers<'dom> {
fn borrow_layout_data(self) -> Option<AtomicRef<'dom, InnerLayoutData>>;
fn mutate_layout_data(self) -> Option<AtomicRefMut<'dom, InnerLayoutData>>;
fn flow_debug_id(self) -> usize;
/// Returns the layout data flags for this node.
fn flags(self) -> LayoutDataFlags;
@ -83,11 +82,6 @@ where
.map(|data| data.0.borrow_mut())
}
fn flow_debug_id(self) -> usize {
self.borrow_layout_data()
.map_or(0, |d| d.flow_construction_result.debug_id())
}
fn flags(self) -> LayoutDataFlags {
self.borrow_layout_data().as_ref().unwrap().flags
}