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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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4
components/shared/net/image_cache.rs
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@ -10,7 +10,7 @@ use malloc_size_of_derive::MallocSizeOf;
use pixels::{Image, ImageMetadata};
use serde::{Deserialize, Serialize};
use servo_url::{ImmutableOrigin, ServoUrl};
use webrender_traits::WebRenderNetApi;
use webrender_traits::CrossProcessCompositorApi;
use crate::request::CorsSettings;
use crate::FetchResponseMsg;
@ -99,7 +99,7 @@ pub enum ImageCacheResult {
}
pub trait ImageCache: Sync + Send {
fn new(webrender_api: WebRenderNetApi) -> Self
fn new(compositor_api: CrossProcessCompositorApi) -> Self
where
Self: Sized;