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Disable remaining reflow traversal pruning for now

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We don't reuse Flow objects between reflows, so we have no old values to fall
back to.

I think this used to work because FlowContexts (as they were called then) were
stored in a DOM node's LayoutData and reused.  But it's possible that it never
really worked, and my testing when I landed the restyle damage code was
insufficient (I didn't understand the layout code nearly as well back then).
This commit is contained in:
Keegan McAllister 2013-12-11 16:00:53 -08:00
parent 0238410b47
commit 53747638a1
1 changed files with 7 additions and 5 deletions
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12
src/components/main/layout/layout_task.rs
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@ -15,7 +15,7 @@ use layout::extra::LayoutAuxMethods;
use layout::flow::{Flow, ImmutableFlowUtils, MutableFlowUtils, PreorderFlowTraversal};
use layout::flow::{PostorderFlowTraversal};
use layout::flow;
use layout::incremental::{RestyleDamage, BubbleWidths};
use layout::incremental::{RestyleDamage};
use layout::util::{LayoutData, LayoutDataAccess};
use extra::arc::{Arc, RWArc, MutexArc};
@ -143,10 +143,13 @@ impl<'self> PostorderFlowTraversal for BubbleWidthsTraversal<'self> {
true
}
// FIXME: We can't prune until we start reusing flows
/*
#[inline]
fn should_prune(&mut self, flow: &mut Flow) -> bool {
flow::mut_base(flow).restyle_damage.lacks(BubbleWidths)
}
*/
}
/// The assign-widths traversal. In Gecko this corresponds to `Reflow`.
@ -372,10 +375,9 @@ impl LayoutTask {
layout_context: &mut LayoutContext) {
let _ = layout_root.traverse_postorder(&mut BubbleWidthsTraversal(layout_context));
// FIXME(kmc): We want to do
// for flow in layout_root.traverse_preorder_prune(|f|
// f.restyle_damage().lacks(Reflow))
// but FloatContext values can't be reused, so we need to recompute them every time.
// FIXME(kmc): We want to prune nodes without the Reflow restyle damage
// bit, but FloatContext values can't be reused, so we need to
// recompute them every time.
// NOTE: this currently computes borders, so any pruning should separate that operation out.
let _ = layout_root.traverse_preorder(&mut AssignWidthsTraversal(layout_context));