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layout: Add a REPOSITION restyle damage type.

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Separating out `REPOSITION` from `REPAINT` allows us to compute
stacking-context-relative positions without rebuilding the display list.
This saves a lot of time when responding to script-to-layout queries.
This commit is contained in:
Patrick Walton 2016-09-20 16:14:54 -07:00
parent 1235f4bff6
commit 65e3db1c0d
6 changed files with 52 additions and 35 deletions
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3
components/layout/sequential.rs
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@ -17,7 +17,7 @@ use generated_content::ResolveGeneratedContent;
use gfx::display_list::{DisplayItem, StackingContext};
use script_layout_interface::restyle_damage::{REFLOW, STORE_OVERFLOW};
use style::context::StyleContext;
use traversal::{AssignBSizes, AssignISizes, BubbleISizes, BuildDisplayList, ComputeAbsolutePositions};
use traversal::{AssignBSizes, AssignISizes, BubbleISizes, BuildDisplayList};
use util::opts;
pub use style::sequential::traverse_dom;
@ -78,7 +78,6 @@ pub fn build_display_list_for_subtree(flow_root: &mut Flow,
root_stacking_context: &mut StackingContext,
shared_layout_context: &SharedLayoutContext)
-> Vec<DisplayItem> {
flow_root.traverse_preorder(&ComputeAbsolutePositions { layout_context: shared_layout_context });
let mut children = vec![];
flow_root.collect_stacking_contexts(root_stacking_context.id,
&mut children);