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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/block.rs
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@ -51,6 +51,7 @@ use model::{self, IntrinsicISizes, MarginCollapseInfo};
use model::{CollapsibleMargins, MaybeAuto, specified, specified_or_none};
use rustc_serialize::{Encodable, Encoder};
use script_layout_interface::restyle_damage::{BUBBLE_ISIZES, REFLOW, REFLOW_OUT_OF_FLOW};
use script_layout_interface::restyle_damage::REPOSITION;
use std::cmp::{max, min};
use std::fmt;
use std::sync::Arc;
@ -2114,6 +2115,8 @@ impl Flow for BlockFlow {
flow::mut_base(kid).stacking_relative_position_of_display_port =
stacking_relative_position_of_display_port_for_children;
}
self.base.restyle_damage.remove(REPOSITION)
}
fn mark_as_root(&mut self) {