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layout: Reference count ComputedValues structures like Gecko does.

Browse source 
This has no difference in CSS selector matching performance and results
in a 31% speedup in constraint solving on the rainbow page.
This commit is contained in:
Patrick Walton 2013-12-11 19:58:27 -08:00
parent 511d2b11d4
commit 4c8383c38b
8 changed files with 66 additions and 53 deletions
Download patch file Download diff file Expand all files Collapse all files

15
src/components/main/css/matching.rs
View file

@ -8,7 +8,7 @@ use std::cell::Cell;
use std::comm;
use std::task;
use std::vec;
use extra::arc::RWArc;
use extra::arc::{Arc, RWArc};
use css::node_style::StyledNode;
use layout::incremental;
@ -85,13 +85,16 @@ impl MatchMethods for AbstractNode<LayoutView> {
fn cascade_node(&self, parent: Option<AbstractNode<LayoutView>>) {
let parent_style = match parent {
Some(parent) => Some(parent.style()),
Some(ref parent) => Some(parent.style()),
None => None
};
let computed_values = unsafe {
cascade(self.borrow_layout_data_unchecked().as_ref().unwrap().applicable_declarations,
parent_style)
Arc::new(cascade(self.borrow_layout_data_unchecked()
.as_ref()
.unwrap()
.applicable_declarations,
parent_style.map(|parent_style| parent_style.get())))
};
match *self.mutate_layout_data().ptr {
@ -102,8 +105,8 @@ impl MatchMethods for AbstractNode<LayoutView> {
None => (),
Some(ref previous_style) => {
layout_data.restyle_damage =
Some(incremental::compute_damage(previous_style,
&computed_values).to_int())
Some(incremental::compute_damage(previous_style.get(),
computed_values.get()).to_int())
}
}
*style = Some(computed_values)

10
src/components/main/css/node_style.rs
View file

@ -7,22 +7,20 @@
use css::node_util::NodeUtil;
use layout::incremental::RestyleDamage;
use extra::arc::Arc;
use style::ComputedValues;
use script::dom::node::{AbstractNode, LayoutView};
/// Node mixin providing `style` method that returns a `NodeStyle`
pub trait StyledNode {
fn style(&self) -> &ComputedValues;
fn style<'a>(&'a self) -> &'a Arc<ComputedValues>;
fn restyle_damage(&self) -> RestyleDamage;
}
impl StyledNode for AbstractNode<LayoutView> {
#[inline]
fn style(&self) -> &ComputedValues {
// FIXME(pcwalton): Is this assertion needed for memory safety? It's slow.
//assert!(self.is_element()); // Only elements can have styles
let results = self.get_css_select_results();
results
fn style<'a>(&'a self) -> &'a Arc<ComputedValues> {
self.get_css_select_results()
}
fn restyle_damage(&self) -> RestyleDamage {

20
src/components/main/css/node_util.rs
View file

@ -5,30 +5,28 @@
use layout::incremental::RestyleDamage;
use layout::util::LayoutDataAccess;
use extra::arc::Arc;
use std::cast;
use style::ComputedValues;
use script::dom::node::{AbstractNode, LayoutView};
use servo_util::tree::TreeNodeRef;
pub trait NodeUtil<'self> {
fn get_css_select_results(self) -> &'self ComputedValues;
fn set_css_select_results(self, decl: ComputedValues);
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);
}
impl<'self> NodeUtil<'self> for AbstractNode<LayoutView> {
impl NodeUtil for AbstractNode<LayoutView> {
/**
* Provides the computed style for the given node. If CSS selector
* Returns the style results for the given node. If CSS selector
* matching has not yet been performed, fails.
* FIXME: This isn't completely memory safe since the style is
* stored in a box that can be overwritten
*/
#[inline]
fn get_css_select_results(self) -> &'self ComputedValues {
fn get_css_select_results<'a>(&'a self) -> &'a Arc<ComputedValues> {
unsafe {
cast::transmute_region(self.borrow_layout_data_unchecked()
.as_ref()
@ -44,14 +42,6 @@ impl<'self> NodeUtil<'self> for AbstractNode<LayoutView> {
self.borrow_layout_data().ptr.as_ref().unwrap().style.is_some()
}
/// Update the computed style of an HTML element with a style specified by CSS.
fn set_css_select_results(self, decl: ComputedValues) {
match *self.mutate_layout_data().ptr {
Some(ref mut data) => data.style = Some(decl),
_ => fail!("no layout data for this node"),
}
}
/// 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 {

56
src/components/main/layout/box.rs
View file

@ -60,6 +60,9 @@ pub struct Box {
/// The DOM node that this `Box` originates from.
node: AbstractNode<LayoutView>,
/// The CSS style of this box.
style: Arc<ComputedValues>,
/// The position of this box relative to its owning flow.
position: Slot<Rect<Au>>,
@ -212,8 +215,27 @@ pub enum SplitBoxResult {
impl Box {
/// Constructs a new `Box` instance.
pub fn new(node: AbstractNode<LayoutView>, specific: SpecificBoxInfo) -> Box {
// Find the nearest ancestor element and take its style. (It should be either that node or
// its immediate parent.)
//
// FIXME(pcwalton): This is incorrect for non-inherited properties on anonymous boxes. For
// example:
//
// <div style="border: solid">
// <p>Foo</p>
// Bar
// <p>Baz</p>
// </div>
//
// An anonymous block box is generated around `Bar`, but it shouldn't inherit the border.
let mut nearest_ancestor_element = node;
while !nearest_ancestor_element.is_element() {
nearest_ancestor_element = node.parent_node().expect("no nearest element?!");
}
Box {
node: node,
style: (*nearest_ancestor_element.style()).clone(),
position: Slot::init(Au::zero_rect()),
border: Slot::init(Zero::zero()),
padding: Slot::init(Zero::zero()),
@ -236,6 +258,7 @@ impl Box {
pub fn transform(&self, size: Size2D<Au>, specific: SpecificBoxInfo) -> Box {
Box {
node: self.node,
style: self.style.clone(),
position: Slot::init(Rect(self.position.get().origin, size)),
border: Slot::init(self.border.get()),
padding: Slot::init(self.padding.get()),
@ -376,7 +399,7 @@ impl Box {
/// FIXME(pcwalton): Just replace with the clear type from the style module for speed?
#[inline(always)]
pub fn clear(&self) -> Option<ClearType> {
let style = self.node.style();
let style = self.style();
match style.Box.clear {
clear::none => None,
clear::left => Some(ClearLeft),
@ -390,7 +413,7 @@ impl Box {
/// FIXME(pcwalton): This should not be necessary; just make the font part of style sharable
/// with the display list somehow. (Perhaps we should use an ARC.)
pub fn font_style(&self) -> FontStyle {
let my_style = self.nearest_ancestor_element().style();
let my_style = self.style();
debug!("(font style) start: {:?}", self.nearest_ancestor_element().type_id());
@ -421,24 +444,23 @@ impl Box {
}
}
// FIXME(pcwalton): Why &'static??? Isn't that wildly unsafe?
#[inline(always)]
pub fn style(&self) -> &'static ComputedValues {
self.node.style()
pub fn style<'a>(&'a self) -> &'a ComputedValues {
self.style.get()
}
/// Returns the text alignment of the computed style of the nearest ancestor-or-self `Element`
/// node.
pub fn text_align(&self) -> text_align::T {
self.nearest_ancestor_element().style().Text.text_align
self.style().Text.text_align
}
pub fn line_height(&self) -> line_height::T {
self.nearest_ancestor_element().style().Box.line_height
self.style().Box.line_height
}
pub fn vertical_align(&self) -> vertical_align::T {
self.nearest_ancestor_element().style().Box.vertical_align
self.style().Box.vertical_align
}
/// Returns the text decoration of the computed style of the nearest `Element` node
@ -458,13 +480,13 @@ impl Box {
// FIXME: Implement correctly.
let display_in_flow = true;
let position = element.style().Box.position;
let float = element.style().Box.float;
let position = element.style().get().Box.position;
let float = element.style().get().Box.float;
let in_flow = (position == position::static_) && (float == float::none) &&
display_in_flow;
let text_decoration = element.style().Text.text_decoration;
let text_decoration = element.style().get().Text.text_decoration;
if text_decoration == text_decoration::none && in_flow {
match element.parent_node() {
@ -524,9 +546,7 @@ impl Box {
// needed. We could use display list optimization to clean this up, but it still seems
// inefficient. What we really want is something like "nearest ancestor element that
// doesn't have a box".
let nearest_ancestor_element = self.nearest_ancestor_element();
let style = nearest_ancestor_element.style();
let style = self.style();
let background_color = style.resolve_color(style.Background.background_color);
if !background_color.alpha.approx_eq(&0.0) {
list.with_mut_ref(|list| {
@ -613,7 +633,7 @@ impl Box {
box_bounds, absolute_box_bounds, self.debug_str());
debug!("Box::build_display_list: dirty={}, offset={}", *dirty, *offset);
if self.nearest_ancestor_element().style().Box.visibility != visibility::visible {
if self.style().Box.visibility != visibility::visible {
return;
}
@ -642,9 +662,7 @@ impl Box {
list.append_item(ClipDisplayItemClass(item));
}
let nearest_ancestor_element = self.nearest_ancestor_element();
let color = nearest_ancestor_element.style().Color.color.to_gfx_color();
let color = self.style().Color.color.to_gfx_color();
// Create the text box.
do list.with_mut_ref |list| {
@ -991,7 +1009,7 @@ impl Box {
/// Returns true if the contents should be clipped (i.e. if `overflow` is `hidden`).
pub fn needs_clip(&self) -> bool {
self.node.style().Box.overflow == overflow::hidden
self.style().Box.overflow == overflow::hidden
}
/// Returns a debugging string describing this box.

5
src/components/main/layout/construct.rs
View file

@ -472,7 +472,10 @@ impl<'self> PostorderNodeMutTraversal for FlowConstructor<'self> {
fn process(&mut self, node: AbstractNode<LayoutView>) -> bool {
// Get the `display` property for this node, and determine whether this node is floated.
let (display, float) = match node.type_id() {
ElementNodeTypeId(_) => (node.style().Box.display, node.style().Box.float),
ElementNodeTypeId(_) => {
let style = node.style().get();
(style.Box.display, style.Box.float)
}
TextNodeTypeId => (display::inline, float::none),
CommentNodeTypeId |
DoctypeNodeTypeId |

7
src/components/main/layout/inline.rs
View file

@ -589,7 +589,7 @@ impl InlineFlow {
// not from the style of the first box child.
let linebox_align = if line.range.begin() < boxes.len() {
let first_box = &boxes[line.range.begin()];
first_box.nearest_ancestor_element().style().Text.text_align
first_box.style().Text.text_align
} else {
// Nothing to lay out, so assume left alignment.
text_align::left
@ -804,8 +804,9 @@ impl Flow for InlineFlow {
// content area. But for now we assume it's zero.
let parent_text_bottom = Au::new(0);
let parent = cur_box.node.parent_node();
let font_size = parent.unwrap().style().Font.font_size;
let parent = cur_box.node.parent_node().unwrap();
let parent_style = parent.style();
let font_size = parent_style.get().Font.font_size;
parent_text_top = font_size;
// Calculate a relative offset from the baseline.

4
src/components/main/layout/layout_task.rs
View file

@ -477,8 +477,8 @@ impl LayoutTask {
for child in node.traverse_preorder() {
if child.type_id() == ElementNodeTypeId(HTMLHtmlElementTypeId) ||
child.type_id() == ElementNodeTypeId(HTMLBodyElementTypeId) {
let element_bg_color = child.style().resolve_color(
child.style().Background.background_color
let element_bg_color = child.style().get().resolve_color(
child.style().get().Background.background_color
).to_gfx_color();
match element_bg_color {
color::rgba(0., 0., 0., 0.) => {}

2
src/components/main/layout/util.rs
View file

@ -127,7 +127,7 @@ pub struct LayoutData {
applicable_declarations: ~[Arc<~[PropertyDeclaration]>],
/// The results of CSS styling for this node.
style: Option<ComputedValues>,
style: Option<Arc<ComputedValues>>,
/// Description of how to account for recent style changes.
restyle_damage: Option<int>,