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Auto merge of #18268 - emilio:dirty-viewport-followup, r=SimonSapin

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style: Recascade the document instead of using the dirty_on_viewport_size_change bit

This allows us to simplify a lot of code.

On top of #18267.

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This commit is contained in:
bors-servo 2017-08-29 14:18:58 -05:00 • committed by GitHub
commit 473934c989
13 changed files with 13 additions and 181 deletions
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10
components/layout_thread/dom_wrapper.rs
View file

@ -38,7 +38,7 @@ use layout::data::StyleAndLayoutData;
use layout::wrapper::GetRawData;
use msg::constellation_msg::{BrowsingContextId, PipelineId};
use range::Range;
use script::layout_exports::{CAN_BE_FRAGMENTED, DIRTY_ON_VIEWPORT_SIZE_CHANGE, HAS_DIRTY_DESCENDANTS, IS_IN_DOC};
use script::layout_exports::{CAN_BE_FRAGMENTED, HAS_DIRTY_DESCENDANTS, IS_IN_DOC};
use script::layout_exports::{CharacterDataTypeId, ElementTypeId, HTMLElementTypeId, NodeTypeId};
use script::layout_exports::{Document, Element, Node, Text};
use script::layout_exports::{HANDLED_SNAPSHOT, HAS_SNAPSHOT};
@ -205,14 +205,6 @@ impl<'ln> TNode for ServoLayoutNode<'ln> {
as_element(self.node)
}
fn needs_dirty_on_viewport_size_changed(&self) -> bool {
unsafe { self.node.get_flag(DIRTY_ON_VIEWPORT_SIZE_CHANGE) }
}
unsafe fn set_dirty_on_viewport_size_changed(&self) {
self.node.set_flag(DIRTY_ON_VIEWPORT_SIZE_CHANGE, true);
}
fn can_be_fragmented(&self) -> bool {
unsafe { self.node.get_flag(CAN_BE_FRAGMENTED) }
}

23
components/layout_thread/lib.rs
View file

@ -1167,27 +1167,8 @@ impl LayoutThread {
.unwrap();
}
if had_used_viewport_units {
let mut iter = element.as_node().traverse_preorder();
let mut next = iter.next();
while let Some(node) = next {
if node.needs_dirty_on_viewport_size_changed() {
let el = node.as_element().unwrap();
if let Some(mut d) = element.mutate_data() {
if d.has_styles() {
// FIXME(emilio): This only needs to recascade,
// afaict.
d.restyle.hint.insert(RestyleHint::restyle_subtree());
}
}
if let Some(p) = el.parent_element() {
unsafe { p.note_dirty_descendant() };
}
next = iter.next_skipping_children();
} else {
next = iter.next();
}
if let Some(mut data) = element.mutate_data() {
data.restyle.hint.insert(RestyleHint::recascade_subtree());
}
}
}

3
components/script/dom/node.rs
View file

@ -169,8 +169,7 @@ bitflags! {
/// Whether any ancestor is a fragmentation container
const CAN_BE_FRAGMENTED = 1 << 4,
#[doc = "Specifies whether this node needs to be dirted when viewport size changed."]
const DIRTY_ON_VIEWPORT_SIZE_CHANGE = 1 << 5,
// There's a free bit here.
#[doc = "Specifies whether the parser has set an associated form owner for \
this element. Only applicable for form-associatable elements."]

2
components/script/lib.rs
View file

@ -142,7 +142,7 @@ pub mod layout_exports {
pub use dom::characterdata::LayoutCharacterDataHelpers;
pub use dom::document::{Document, LayoutDocumentHelpers, PendingRestyle};
pub use dom::element::{Element, LayoutElementHelpers, RawLayoutElementHelpers};
pub use dom::node::{CAN_BE_FRAGMENTED, DIRTY_ON_VIEWPORT_SIZE_CHANGE, HAS_DIRTY_DESCENDANTS, IS_IN_DOC};
pub use dom::node::{CAN_BE_FRAGMENTED, HAS_DIRTY_DESCENDANTS, IS_IN_DOC};
pub use dom::node::{HANDLED_SNAPSHOT, HAS_SNAPSHOT};
pub use dom::node::{LayoutNodeHelpers, Node};
pub use dom::text::Text;

1
components/style/animation.rs
View file

@ -502,7 +502,6 @@ fn compute_style_for_animation_step(context: &SharedStyleContext,
Some(previous_style),
Some(previous_style),
Some(previous_style),
/* cascade_info = */ None,
/* visited_style = */ None,
font_metrics_provider,
CascadeFlags::empty(),

95
components/style/cascade_info.rs
View file

@ -1,95 +0,0 @@
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
//! A structure to collect information about the cascade.
#![deny(missing_docs)]
use dom::TNode;
use properties::{DeclaredValue, PropertyDeclaration};
use style_traits::HasViewportPercentage;
/// A structure to collect information about the cascade.
///
/// This is useful to gather information about what an element is affected by,
/// and can be used in the future to track optimisations like when a
/// non-inherited property is explicitly inherited, in order to cut-off the
/// traversal.
pub struct CascadeInfo {
/// Whether we've seen viewport units so far.
pub saw_viewport_units: bool,
/// Whether the cascade has been marked as finished. This is a debug-only
/// flag to ensure `finish` is called, given it's optional to not pass a
/// `CascadeInfo`.
#[cfg(debug_assertions)]
finished: bool,
}
impl CascadeInfo {
/// Construct a new `CascadeInfo`.
#[cfg(debug_assertions)]
pub fn new() -> Self {
CascadeInfo {
saw_viewport_units: false,
finished: false,
}
}
/// Construct a new `CascadeInfo`.
#[cfg(not(debug_assertions))]
pub fn new() -> Self {
CascadeInfo {
saw_viewport_units: false,
}
}
/// Called when a property is cascaded.
///
/// NOTE: We can add a vast amount of information here.
#[inline]
pub fn on_cascade_property<T>(&mut self,
_property_declaration: &PropertyDeclaration,
value: &DeclaredValue<T>)
where T: HasViewportPercentage,
{
// TODO: we can be smarter and keep a property bitfield to keep track of
// the last applying rule.
if value.has_viewport_percentage() {
self.saw_viewport_units = true;
}
}
#[cfg(debug_assertions)]
fn mark_as_finished_if_appropriate(&mut self) {
self.finished = true;
}
#[cfg(not(debug_assertions))]
fn mark_as_finished_if_appropriate(&mut self) {}
/// Called when the cascade is finished, in order to use the information
/// we've collected.
///
/// Currently used for styling to mark a node as needing restyling when the
/// viewport size changes.
#[allow(unsafe_code)]
pub fn finish<N: TNode>(mut self, node: &N) {
self.mark_as_finished_if_appropriate();
if self.saw_viewport_units {
unsafe {
node.set_dirty_on_viewport_size_changed();
}
}
}
}
#[cfg(debug_assertions)]
impl Drop for CascadeInfo {
fn drop(&mut self) {
debug_assert!(self.finished,
"Didn't use the result of CascadeInfo, if you don't need \
it, consider passing None");
}
}

6
components/style/dom.rs
View file

@ -138,12 +138,6 @@ pub trait TNode : Sized + Copy + Clone + Debug + NodeInfo {
/// Get this node as an element, if it's one.
fn as_element(&self) -> Option<Self::ConcreteElement>;
/// Whether this node needs to be laid out on viewport size change.
fn needs_dirty_on_viewport_size_changed(&self) -> bool;
/// Mark this node as needing layout on viewport size change.
unsafe fn set_dirty_on_viewport_size_changed(&self);
/// Whether this node can be fragmented. This is used for multicol, and only
/// for Servo.
fn can_be_fragmented(&self) -> bool;

11
components/style/gecko/wrapper.rs
View file

@ -318,17 +318,6 @@ impl<'ln> TNode for GeckoNode<'ln> {
fn is_in_doc(&self) -> bool {
unsafe { bindings::Gecko_IsInDocument(self.0) }
}
fn needs_dirty_on_viewport_size_changed(&self) -> bool {
// Gecko's node doesn't have the DIRTY_ON_VIEWPORT_SIZE_CHANGE flag,
// so we force them to be dirtied on viewport size change, regardless if
// they use viewport percentage size or not.
// TODO(shinglyu): implement this in Gecko: https://github.com/servo/servo/pull/11890
true
}
// TODO(shinglyu): implement this in Gecko: https://github.com/servo/servo/pull/11890
unsafe fn set_dirty_on_viewport_size_changed(&self) {}
}
/// A wrapper on top of two kind of iterators, depending on the parent being

1
components/style/lib.rs
View file

@ -99,7 +99,6 @@ pub mod applicable_declarations;
pub mod bezier;
pub mod bloom;
pub mod cache;
pub mod cascade_info;
pub mod context;
pub mod counter_style;
pub mod custom_properties;

6
components/style/properties/helpers.mako.rs
View file

@ -275,8 +275,6 @@
#[allow(unused_imports)]
use values::{Auto, Either, None_, Normal};
#[allow(unused_imports)]
use cascade_info::CascadeInfo;
#[allow(unused_imports)]
use error_reporting::ParseErrorReporter;
#[allow(unused_imports)]
use properties::longhands;
@ -303,7 +301,6 @@
pub fn cascade_property(
declaration: &PropertyDeclaration,
context: &mut computed::Context,
cascade_info: &mut Option<<&mut CascadeInfo>,
) {
let value = match *declaration {
PropertyDeclaration::${property.camel_case}(ref value) => {
@ -320,9 +317,6 @@
};
% if not property.derived_from:
if let Some(ref mut cascade_info) = *cascade_info {
cascade_info.on_cascade_property(&declaration, &value);
}
match value {
DeclaredValue::Value(ref specified_value) => {
% if property.ident in SYSTEM_FONT_LONGHANDS and product == "gecko":

27
components/style/properties/properties.mako.rs
View file

@ -43,7 +43,6 @@ use stylesheets::{CssRuleType, MallocSizeOf, MallocSizeOfFn, Origin, UrlExtraDat
use values::generics::text::LineHeight;
use values::computed;
use values::computed::NonNegativeAu;
use cascade_info::CascadeInfo;
use rule_tree::{CascadeLevel, StrongRuleNode};
use self::computed_value_flags::ComputedValueFlags;
use style_adjuster::StyleAdjuster;
@ -2953,9 +2952,10 @@ mod lazy_static_module {
/// A per-longhand function that performs the CSS cascade for that longhand.
pub type CascadePropertyFn =
extern "Rust" fn(declaration: &PropertyDeclaration,
context: &mut computed::Context,
cascade_info: &mut Option<<&mut CascadeInfo>);
extern "Rust" fn(
declaration: &PropertyDeclaration,
context: &mut computed::Context,
);
/// A per-longhand array of functions to perform the CSS cascade on each of
/// them, effectively doing virtual dispatch.
@ -3030,7 +3030,6 @@ pub fn cascade(
parent_style_ignoring_first_line: Option<<&ComputedValues>,
layout_parent_style: Option<<&ComputedValues>,
visited_style: Option<Arc<ComputedValues>>,
cascade_info: Option<<&mut CascadeInfo>,
font_metrics_provider: &FontMetricsProvider,
flags: CascadeFlags,
quirks_mode: QuirksMode
@ -3089,7 +3088,6 @@ pub fn cascade(
parent_style_ignoring_first_line,
layout_parent_style,
visited_style,
cascade_info,
font_metrics_provider,
flags,
quirks_mode,
@ -3108,7 +3106,6 @@ pub fn apply_declarations<'a, F, I>(
parent_style_ignoring_first_line: Option<<&ComputedValues>,
layout_parent_style: Option<<&ComputedValues>,
visited_style: Option<Arc<ComputedValues>>,
mut cascade_info: Option<<&mut CascadeInfo>,
font_metrics_provider: &FontMetricsProvider,
flags: CascadeFlags,
quirks_mode: QuirksMode,
@ -3280,9 +3277,7 @@ where
% endif
let discriminant = longhand_id as usize;
(CASCADE_PROPERTY[discriminant])(&*declaration,
&mut context,
&mut cascade_info);
(CASCADE_PROPERTY[discriminant])(&*declaration, &mut context);
}
% if category_to_cascade_now == "early":
let writing_mode = get_writing_mode(context.builder.get_inheritedbox());
@ -3363,9 +3358,7 @@ where
if let Some(ref declaration) = font_family {
let discriminant = LonghandId::FontFamily as usize;
(CASCADE_PROPERTY[discriminant])(declaration,
&mut context,
&mut cascade_info);
(CASCADE_PROPERTY[discriminant])(declaration, &mut context);
% if product == "gecko":
let device = context.builder.device;
if let PropertyDeclaration::FontFamily(ref val) = **declaration {
@ -3383,9 +3376,7 @@ where
if let Some(ref declaration) = font_size {
let discriminant = LonghandId::FontSize as usize;
(CASCADE_PROPERTY[discriminant])(declaration,
&mut context,
&mut cascade_info);
(CASCADE_PROPERTY[discriminant])(declaration, &mut context);
% if product == "gecko":
// Font size must be explicitly inherited to handle lang changes and
// scriptlevel changes.
@ -3397,9 +3388,7 @@ where
let size = PropertyDeclaration::CSSWideKeyword(
LonghandId::FontSize, CSSWideKeyword::Inherit);
(CASCADE_PROPERTY[discriminant])(&size,
&mut context,
&mut cascade_info);
(CASCADE_PROPERTY[discriminant])(&size, &mut context);
% endif
}
% endif

5
components/style/style_resolver.rs
View file

@ -5,7 +5,6 @@
//! Style resolution for a given element or pseudo-element.
use applicable_declarations::ApplicableDeclarationList;
use cascade_info::CascadeInfo;
use context::{CascadeInputs, ElementCascadeInputs, StyleContext};
use data::{ElementStyles, EagerPseudoStyles};
use dom::TElement;
@ -486,7 +485,6 @@ where
cascade_visited: CascadeVisitedMode,
pseudo: Option<&PseudoElement>,
) -> Arc<ComputedValues> {
let mut cascade_info = CascadeInfo::new();
let mut cascade_flags = CascadeFlags::empty();
if self.element.skip_root_and_item_based_display_fixup() ||
@ -530,14 +528,11 @@ where
parent_style,
layout_parent_style,
style_if_visited,
Some(&mut cascade_info),
&self.context.thread_local.font_metrics_provider,
cascade_flags,
self.context.shared.quirks_mode(),
);
cascade_info.finish(&self.element.as_node());
values
}
}

4
components/style/stylist.rs
View file

@ -721,7 +721,6 @@ impl Stylist {
parent,
parent,
None,
None,
font_metrics,
cascade_flags,
self.quirks_mode,
@ -901,7 +900,6 @@ impl Stylist {
Some(inherited_style_ignoring_first_line),
Some(layout_parent_style_for_visited),
None,
None,
font_metrics,
cascade_flags,
self.quirks_mode,
@ -927,7 +925,6 @@ impl Stylist {
Some(parent_style_ignoring_first_line),
Some(layout_parent_style),
visited_values,
None,
font_metrics,
cascade_flags,
self.quirks_mode,
@ -1543,7 +1540,6 @@ impl Stylist {
Some(parent_style),
Some(parent_style),
None,
None,
&metrics,
CascadeFlags::empty(),
self.quirks_mode,