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compositor: Create a single cross-process compositor API (#33619) (#33660)

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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 2024-10-09 10:30:24 -07:00 • committed by GitHub
parent 30cbf01280
commit 9195344b75
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28 changed files with 547 additions and 800 deletions
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4
components/shared/script_layout/lib.rs
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@ -53,7 +53,7 @@ use style::stylesheets::Stylesheet;
use style::Atom;
use style_traits::CSSPixel;
use webrender_api::ImageKey;
use webrender_traits::WebRenderScriptApi;
use webrender_traits::CrossProcessCompositorApi;
pub type GenericLayoutData = dyn Any + Send + Sync;
@ -177,7 +177,7 @@ pub struct LayoutConfig {
pub resource_threads: ResourceThreads,
pub system_font_service: Arc<SystemFontServiceProxy>,
pub time_profiler_chan: time::ProfilerChan,
pub webrender_api_sender: WebRenderScriptApi,
pub compositor_api: CrossProcessCompositorApi,
pub paint_time_metrics: PaintTimeMetrics,
pub window_size: WindowSizeData,
}