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compositor: Create a single cross-process compositor API (#33619)

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Instead of exposing many different kinds of messages to the compositor
that are routed through the constellation, expose a single message type
which can be sent across IPC channels. In addition, this IPC channel and
the route to the crossbeam channel with the compositor is created along
with the `CompositorProxy`, simplifying what needs to be passed around
during pipeline initialization.

Previously, some image updates (from video) were sent over IPC with a
special serialization routine and some were sent via crossbeam channels
(canvas). Now all updates go over the IPC channel `IpcSharedMemory` is
used to avoid serialization penalties. This should improve performance
and reduce copies for video, but add a memory copy overhead for canvas.
This will improve in the future when canvas renders directly into a
texture.

All-in-all this is a simplification which opens the path toward having a
standard compositor API and reduces the number of duplicate messages and
proxying that had to happen in libservo.

Signed-off-by: Martin Robinson <mrobinson@igalia.com>
This commit is contained in:
Martin Robinson 2024-10-03 16:42:04 +02:00 • committed by GitHub
parent 986c3a38a3
commit f2f5614ad6
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28 changed files with 547 additions and 801 deletions
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10
components/shared/script/script_msg.rs
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@ -24,7 +24,6 @@ use serde::{Deserialize, Serialize};
use servo_url::{ImmutableOrigin, ServoUrl};
use style_traits::CSSPixel;
use webgpu::{wgc, WebGPU, WebGPUResponse};
use webrender_api::units::{DeviceIntPoint, DeviceIntSize};
use crate::{
AnimationState, AuxiliaryBrowsingContextLoadInfo, BroadcastMsg, DocumentState,
@ -245,12 +244,6 @@ pub enum ScriptMsg {
ForwardDOMMessage(DOMMessage, ServoUrl),
/// <https://w3c.github.io/ServiceWorker/#schedule-job-algorithm>
ScheduleJob(Job),
/// Get Window Informations size and position
GetClientWindow(IpcSender<(DeviceIntSize, DeviceIntPoint)>),
/// Get the screen size (pixel)
GetScreenSize(IpcSender<DeviceIntSize>),
/// Get the available screen size (pixel)
GetScreenAvailSize(IpcSender<DeviceIntSize>),
/// Notifies the constellation about media session events
/// (i.e. when there is metadata for the active media session, playback state changes...).
MediaSessionEvent(PipelineId, MediaSessionEvent),
@ -318,9 +311,6 @@ impl fmt::Debug for ScriptMsg {
PipelineExited => "PipelineExited",
ForwardDOMMessage(..) => "ForwardDOMMessage",
ScheduleJob(..) => "ScheduleJob",
GetClientWindow(..) => "GetClientWindow",
GetScreenSize(..) => "GetScreenSize",
GetScreenAvailSize(..) => "GetScreenAvailSize",
MediaSessionEvent(..) => "MediaSessionEvent",
RequestAdapter(..) => "RequestAdapter",
GetWebGPUChan(..) => "GetWebGPUChan",