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Incremental Style Recalc

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This patch puts in the initial framework for incremental reflow. Nodes' styles
are no longer recalculated unless the node has changed.

I've been hacking on the general problem of incremental reflow for the past
couple weeks, and I've yet to get a full implementation that actually passes all
the reftests + wikipedia + cnn. Therefore, I'm going to try to land the different
parts of it one by one.

This patch only does incremental style recalc, without incremental flow
construction, inline-size bubbling, reflow, or display lists. Those will be coming
in that order as I finish them.

At least with this strategy, I can land a working version of incremental reflow,
even if not yet complete.

r? @pcwalton
This commit is contained in:
Clark Gaebel 2014-10-06 11:40:05 -04:00
parent 510f8a817f
commit d12c6e7383
31 changed files with 641 additions and 424 deletions
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21
components/layout/css/node_util.rs
View file

@ -4,7 +4,7 @@
use incremental::RestyleDamage;
use util::LayoutDataAccess;
use wrapper::{TLayoutNode, ThreadSafeLayoutNode};
use wrapper::ThreadSafeLayoutNode;
use wrapper::{After, Before, Normal};
use std::mem;
use style::ComputedValues;
@ -14,8 +14,8 @@ pub trait NodeUtil {
fn get_css_select_results<'a>(&'a self) -> &'a Arc<ComputedValues>;
fn have_css_select_results(&self) -> bool;
fn get_restyle_damage(&self) -> RestyleDamage;
fn set_restyle_damage(&self, damage: RestyleDamage);
fn get_restyle_damage(self) -> RestyleDamage;
fn set_restyle_damage(self, damage: RestyleDamage);
}
impl<'ln> NodeUtil for ThreadSafeLayoutNode<'ln> {
@ -62,28 +62,19 @@ impl<'ln> NodeUtil for ThreadSafeLayoutNode<'ln> {
/// Get the description of how to account for recent style changes.
/// This is a simple bitfield and fine to copy by value.
fn get_restyle_damage(&self) -> RestyleDamage {
// For DOM elements, if we haven't computed damage yet, assume the worst.
// Other nodes don't have styles.
let default = if self.node_is_element() {
RestyleDamage::all()
} else {
RestyleDamage::empty()
};
fn get_restyle_damage(self) -> RestyleDamage {
let layout_data_ref = self.borrow_layout_data();
layout_data_ref
.as_ref().unwrap()
.data
.restyle_damage
.unwrap_or(default)
}
/// Set the restyle damage field.
fn set_restyle_damage(&self, damage: RestyleDamage) {
fn set_restyle_damage(self, damage: RestyleDamage) {
let mut layout_data_ref = self.mutate_layout_data();
match &mut *layout_data_ref {
&Some(ref mut layout_data) => layout_data.data.restyle_damage = Some(damage),
&Some(ref mut layout_data) => layout_data.data.restyle_damage = damage,
_ => fail!("no layout data for this node"),
}
}