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layout: Switch display list building from bottom-up to top-down.

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This eliminates a lot of allocations and O(n^2) behavior.
This commit is contained in:
Patrick Walton 2016-03-02 15:41:50 -08:00
parent f4b95dd00b
commit d3d2dd05f2
5 changed files with 35 additions and 58 deletions
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13
components/layout/layout_thread.rs
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@ -875,9 +875,10 @@ impl LayoutThread {
false,
None);
sequential::build_display_list_for_subtree(layout_root,
&mut root_stacking_context,
shared_layout_context);
let display_list_entries =
sequential::build_display_list_for_subtree(layout_root,
&mut root_stacking_context,
shared_layout_context);
if data.goal == ReflowGoal::ForDisplay {
debug!("Done building display list.");
@ -900,11 +901,9 @@ impl LayoutThread {
ScrollPolicy::Scrollable,
None,
root_background_color));
let display_list = DisplayList::new(
root_stacking_context,
&mut flow::mut_base(flow_ref::deref_mut(layout_root))
.display_list_building_result);
let display_list = DisplayList::new(root_stacking_context,
&mut Some(display_list_entries));
if opts::get().dump_display_list {
display_list.print();
}