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layout: Remove LayoutRPC and query layout via the Layout trait (#31937)

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Instead of the tricky `LayoutRPC` interface, query layout using the
`Layout` trait. This means that now queries will requires calling layout
and then running the query. During layout an enum is used to indicate
what kind of layout is necessary.

This change also removes the mutex-locked `rw_data` from both layout
threads. It's no longer necessary since layout runs synchronously. The
one downside here is that for resolved style queries, we now have to
create two StyleContexts. One for layout and one for the query itself.
The creation of this context should not be very expensive though.

`LayoutRPC` used to be necessary because layout used to run
asynchronously from script, but that no longer happens. With this
change, it becomes possible to safely pass nodes to layout from script
-- a cleanup that can happen in a followup change.
This commit is contained in:
Martin Robinson 2024-03-29 17:25:47 +01:00 • committed by GitHub
parent 07391e346b
commit b7d089930e
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GPG key ID: B5690EEEBB952194
12 changed files with 667 additions and 1174 deletions
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87
components/shared/script_layout/message.rs
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@ -4,21 +4,17 @@
use app_units::Au;
use crossbeam_channel::Sender;
use euclid::default::{Point2D, Rect};
use euclid::default::Rect;
use malloc_size_of_derive::MallocSizeOf;
use msg::constellation_msg::BrowsingContextId;
use profile_traits::mem::ReportsChan;
use script_traits::{Painter, ScrollState, WindowSizeData};
use servo_atoms::Atom;
use servo_url::ImmutableOrigin;
use style::animation::DocumentAnimationSet;
use style::context::QuirksMode;
use style::dom::OpaqueNode;
use style::invalidation::element::restyle_hints::RestyleHint;
use style::properties::PropertyId;
use style::selector_parser::{PseudoElement, RestyleDamage, Snapshot};
use style::selector_parser::{RestyleDamage, Snapshot};
use crate::rpc::LayoutRPC;
use crate::{PendingImage, TrustedNodeAddress};
/// Asynchronous messages that script can send to layout.
@ -29,9 +25,6 @@ pub enum Msg {
/// Requests a reflow.
Reflow(ScriptReflow),
/// Get an RPC interface.
GetRPC(Sender<Box<dyn LayoutRPC + Send>>),
/// Requests that layout measure its memory usage. The resulting reports are sent back
/// via the supplied channel.
CollectReports(ReportsChan),
@ -55,23 +48,19 @@ pub enum NodesFromPointQueryType {
#[derive(Debug, PartialEq)]
pub enum QueryMsg {
ContentBoxQuery(OpaqueNode),
ContentBoxesQuery(OpaqueNode),
ClientRectQuery(OpaqueNode),
ScrollingAreaQuery(Option<OpaqueNode>),
OffsetParentQuery(OpaqueNode),
TextIndexQuery(OpaqueNode, Point2D<f32>),
NodesFromPointQuery(Point2D<f32>, NodesFromPointQueryType),
// FIXME(nox): The following queries use the TrustedNodeAddress to
// access actual DOM nodes, but those values can be constructed from
// garbage values such as `0xdeadbeef as *const _`, this is unsound.
NodeScrollIdQuery(TrustedNodeAddress),
ResolvedStyleQuery(TrustedNodeAddress, Option<PseudoElement>, PropertyId),
ContentBox,
ContentBoxes,
ClientRectQuery,
ScrollingAreaQuery,
OffsetParentQuery,
TextIndexQuery,
NodesFromPointQuery,
NodeScrollIdQuery,
ResolvedStyleQuery,
StyleQuery,
ElementInnerTextQuery(TrustedNodeAddress),
ResolvedFontStyleQuery(TrustedNodeAddress, PropertyId, String),
InnerWindowDimensionsQuery(BrowsingContextId),
ElementInnerTextQuery,
ResolvedFontStyleQuery,
InnerWindowDimensionsQuery,
}
/// Any query to perform with this reflow.
@ -93,18 +82,18 @@ impl ReflowGoal {
match *self {
ReflowGoal::Full | ReflowGoal::TickAnimations | ReflowGoal::UpdateScrollNode(_) => true,
ReflowGoal::LayoutQuery(ref querymsg, _) => match *querymsg {
QueryMsg::ElementInnerTextQuery(_) |
QueryMsg::InnerWindowDimensionsQuery(_) |
QueryMsg::NodesFromPointQuery(..) |
QueryMsg::ResolvedStyleQuery(..) |
QueryMsg::TextIndexQuery(..) => true,
QueryMsg::ClientRectQuery(_) |
QueryMsg::ContentBoxQuery(_) |
QueryMsg::ContentBoxesQuery(_) |
QueryMsg::NodeScrollIdQuery(_) |
QueryMsg::OffsetParentQuery(_) |
QueryMsg::ResolvedFontStyleQuery(..) |
QueryMsg::ScrollingAreaQuery(_) |
QueryMsg::ElementInnerTextQuery |
QueryMsg::InnerWindowDimensionsQuery |
QueryMsg::NodesFromPointQuery |
QueryMsg::ResolvedStyleQuery |
QueryMsg::TextIndexQuery => true,
QueryMsg::ClientRectQuery |
QueryMsg::ContentBox |
QueryMsg::ContentBoxes |
QueryMsg::NodeScrollIdQuery |
QueryMsg::OffsetParentQuery |
QueryMsg::ResolvedFontStyleQuery |
QueryMsg::ScrollingAreaQuery |
QueryMsg::StyleQuery => false,
},
}
@ -116,18 +105,18 @@ impl ReflowGoal {
match *self {
ReflowGoal::Full | ReflowGoal::TickAnimations | ReflowGoal::UpdateScrollNode(_) => true,
ReflowGoal::LayoutQuery(ref querymsg, _) => match *querymsg {
QueryMsg::NodesFromPointQuery(..) |
QueryMsg::TextIndexQuery(..) |
QueryMsg::ElementInnerTextQuery(_) => true,
QueryMsg::ContentBoxQuery(_) |
QueryMsg::ContentBoxesQuery(_) |
QueryMsg::ClientRectQuery(_) |
QueryMsg::ScrollingAreaQuery(_) |
QueryMsg::NodeScrollIdQuery(_) |
QueryMsg::ResolvedStyleQuery(..) |
QueryMsg::ResolvedFontStyleQuery(..) |
QueryMsg::OffsetParentQuery(_) |
QueryMsg::InnerWindowDimensionsQuery(_) |
QueryMsg::NodesFromPointQuery |
QueryMsg::TextIndexQuery |
QueryMsg::ElementInnerTextQuery => true,
QueryMsg::ContentBox |
QueryMsg::ContentBoxes |
QueryMsg::ClientRectQuery |
QueryMsg::ScrollingAreaQuery |
QueryMsg::NodeScrollIdQuery |
QueryMsg::ResolvedStyleQuery |
QueryMsg::ResolvedFontStyleQuery |
QueryMsg::OffsetParentQuery |
QueryMsg::InnerWindowDimensionsQuery |
QueryMsg::StyleQuery => false,
},
}