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Use an AtomicRefCell instead of a RwLock for caching intrinsic sizes (#34384)

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It panics if the value is mutably borrowed concurrently, but this allows
it to perform better.

Signed-off-by: Oriol Brufau <obrufau@igalia.com>
This commit is contained in:
Oriol Brufau 2024-11-26 14:35:41 +01:00 • committed by GitHub
parent 63793ccbb7
commit d034385f76
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GPG key ID: B5690EEEBB952194
1 changed files with 9 additions and 13 deletions
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22
components/layout_2020/formatting_contexts.rs
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@ -2,9 +2,8 @@
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
use std::sync::RwLock;
use app_units::Au;
use atomic_refcell::AtomicRefCell;
use serde::Serialize;
use servo_arc::Arc;
use style::properties::ComputedValues;
@ -41,7 +40,8 @@ pub(crate) struct NonReplacedFormattingContext {
#[serde(skip_serializing)]
pub style: Arc<ComputedValues>,
/// If it was requested during construction
pub content_sizes_result: RwLock<Option<(SizeConstraint, InlineContentSizesResult)>>,
#[serde(skip_serializing)]
pub content_sizes_result: AtomicRefCell<Option<(SizeConstraint, InlineContentSizesResult)>>,
pub contents: NonReplacedFormattingContextContents,
}
@ -169,7 +169,7 @@ impl IndependentFormattingContext {
Self::NonReplaced(NonReplacedFormattingContext {
style: Arc::clone(&node_and_style_info.style),
base_fragment_info,
content_sizes_result: RwLock::default(),
content_sizes_result: AtomicRefCell::default(),
contents,
})
},
@ -298,24 +298,20 @@ impl NonReplacedFormattingContext {
layout_context: &LayoutContext,
constraint_space: &ConstraintSpace,
) -> InlineContentSizesResult {
if let Ok(Some((previous_cb_block_size, result))) =
self.content_sizes_result.read().as_deref()
{
let mut cache = self.content_sizes_result.borrow_mut();
if let Some((previous_cb_block_size, result)) = *cache {
if !result.depends_on_block_constraints ||
*previous_cb_block_size == constraint_space.block_size
previous_cb_block_size == constraint_space.block_size
{
return *result;
return result;
}
// TODO: Should we keep multiple caches for various block sizes?
}
let writer = self.content_sizes_result.write();
let result = self
.contents
.inline_content_sizes(layout_context, constraint_space);
if let Ok(mut cache) = writer {
*cache = Some((constraint_space.block_size, result));
}
*cache = Some((constraint_space.block_size, result));
result
}