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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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8
components/shared/script/lib.rs
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@ -58,7 +58,9 @@ use style_traits::{CSSPixel, SpeculativePainter};
use webgpu::WebGPUMsg;
use webrender_api::units::{DeviceIntSize, DevicePixel, LayoutPixel};
use webrender_api::{DocumentId, ExternalScrollId, ImageKey};
use webrender_traits::{UntrustedNodeAddress as WebRenderUntrustedNodeAddress, WebRenderScriptApi};
use webrender_traits::{
CrossProcessCompositorApi, UntrustedNodeAddress as WebRenderUntrustedNodeAddress,
};
pub use crate::script_msg::{
DOMMessage, EventResult, HistoryEntryReplacement, IFrameSizeMsg, Job, JobError, JobResult,
@ -659,8 +661,8 @@ pub struct InitialScriptState {
pub webxr_registry: webxr_api::Registry,
/// The Webrender document ID associated with this thread.
pub webrender_document: DocumentId,
/// FIXME(victor): The Webrender API sender in this constellation's pipeline
pub webrender_api_sender: WebRenderScriptApi,
/// Access to the compositor across a process boundary.
pub compositor_api: CrossProcessCompositorApi,
/// Application window's GL Context for Media player
pub player_context: WindowGLContext,
}