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Layout: minor optimizations and bugfix for non-functional details (#38197)
This change adds some minor optimizations and bugfix for non-functional details with seperated commits: - fix the omission that stop use `Rayon` in single-thread mode - add trace for incremental box tree construction - fix the bug that failed to skip reflow entirely when there is no need for `restyle` and a fragment tree has already been built. - add trace for stylist preparation during reflow. In certain scenarios, this phase might take up a significant amount of time, such as when there are a large number of shadow trees. Testing: This should not change observable behavior and is thus covered by existing WPT tests. --------- Signed-off-by: sharpshooter_pt <ibluegalaxy_taoj@163.com>
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3 changed files with 8 additions and 2 deletions
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@ -589,7 +589,7 @@ impl LayoutThread {
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return false;
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}
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// We always need to at least build a fragment tree.
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if !self.fragment_tree.borrow().is_none() {
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if self.fragment_tree.borrow().is_none() {
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return false;
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}
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@ -710,6 +710,7 @@ impl LayoutThread {
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(viewport_changed && had_used_viewport_units) || theme_changed
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}
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#[servo_tracing::instrument(skip_all)]
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fn prepare_stylist_for_reflow<'dom>(
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&mut self,
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reflow_request: &ReflowRequest,
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