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layout: Send back layout results directly and remove channels (#34609)

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This eliminates the way that crossbeam channels are used to send layout
results back to script, which should increase the efficiency of layout.
If asynchronous layout is re-established it can be written as a layer on
top of the layout interface, that way layout doesn't have to know so
many details of how the asynchronocity works.

Renames:
 - `ScriptReflow` to `ReflowRequest`: Script is the only thing that
   requests reflow.
 - `ReflowComplete` to `ReflowResult`

Signed-off-by: Martin Robinson <mrobinson@igalia.com>
This commit is contained in:
Martin Robinson 2024-12-13 19:56:54 +01:00 • committed by GitHub
parent d24234ac72
commit 2328145c25
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4 changed files with 64 additions and 176 deletions
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9
components/shared/script_layout/lib.rs
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@ -21,7 +21,6 @@ use base::cross_process_instant::CrossProcessInstant;
use base::id::{BrowsingContextId, PipelineId};
use base::Epoch;
use canvas_traits::canvas::{CanvasId, CanvasMsg};
use crossbeam_channel::Sender;
use euclid::default::{Point2D, Rect};
use euclid::Size2D;
use fonts::SystemFontServiceProxy;
@ -238,7 +237,7 @@ pub trait Layout {
fn remove_stylesheet(&mut self, stylesheet: ServoArc<Stylesheet>);
/// Requests a reflow.
fn reflow(&mut self, script_reflow: ScriptReflow);
fn reflow(&mut self, reflow_request: ReflowRequest) -> Option<ReflowResult>;
/// Tells layout that script has added some paint worklet modules.
fn register_paint_worklet_modules(
@ -403,14 +402,14 @@ pub struct Reflow {
/// Information derived from a layout pass that needs to be returned to the script thread.
#[derive(Debug, Default)]
pub struct ReflowComplete {
pub struct ReflowResult {
/// The list of images that were encountered that are in progress.
pub pending_images: Vec<PendingImage>,
}
/// Information needed for a script-initiated reflow.
#[derive(Debug)]
pub struct ScriptReflow {
pub struct ReflowRequest {
/// General reflow data.
pub reflow_info: Reflow,
/// The document node.
@ -421,8 +420,6 @@ pub struct ScriptReflow {
pub stylesheets_changed: bool,
/// The current window size.
pub window_size: WindowSizeData,
/// The channel that we send a notification to.
pub script_join_chan: Sender<ReflowComplete>,
/// The goal of this reflow.
pub reflow_goal: ReflowGoal,
/// The number of objects in the dom #10110