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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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8
components/layout/flow.rs
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@ -34,7 +34,7 @@ use floats::Floats;
use flow_list::{FlowList, FlowListIterator, MutFlowListIterator};
use flow_ref::{self, FlowRef, WeakFlowRef};
use fragment::{Fragment, FragmentBorderBoxIterator, Overflow, SpecificFragmentInfo};
use gfx::display_list::{ClippingRegion, DisplayListEntry, StackingContext, StackingContextId};
use gfx::display_list::{ClippingRegion, StackingContext, StackingContextId};
use gfx_traits::{LayerId, LayerType};
use incremental::{RECONSTRUCT_FLOW, REFLOW, REFLOW_OUT_OF_FLOW, REPAINT, RestyleDamage};
use inline::InlineFlow;
@ -957,9 +957,6 @@ pub struct BaseFlow {
/// per-stacking-context.
pub stacking_relative_position_of_display_port: Rect<Au>,
/// The results of display list building for this flow.
pub display_list_building_result: Option<Vec<DisplayListEntry>>,
/// The writing mode for this flow.
pub writing_mode: WritingMode,
@ -1129,7 +1126,6 @@ impl BaseFlow {
block_container_writing_mode: writing_mode,
block_container_explicit_block_size: None,
absolute_cb: ContainingBlockLink::new(),
display_list_building_result: None,
early_absolute_position_info: EarlyAbsolutePositionInfo::new(writing_mode),
late_absolute_position_info: LateAbsolutePositionInfo::new(),
clip: ClippingRegion::max(),
@ -1147,8 +1143,6 @@ impl BaseFlow {
children: children,
restyle_damage: self.restyle_damage | REPAINT | REFLOW_OUT_OF_FLOW | REFLOW,
parallel: FlowParallelInfo::new(),
display_list_building_result: None,
floats: self.floats.clone(),
abs_descendants: self.abs_descendants.clone(),
absolute_cb: self.absolute_cb.clone(),