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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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7
ports/servoshell/egl/servo_glue.rs
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@ -25,6 +25,7 @@ use servo::script_traits::{
};
use servo::servo_url::ServoUrl;
use servo::style_traits::DevicePixel;
use servo::webrender_api::units::DeviceIntRect;
use servo::webrender_api::ScrollLocation;
use servo::webrender_traits::RenderingContext;
use servo::{gl, Servo, TopLevelBrowsingContextId};
@ -693,9 +694,9 @@ impl WindowMethods for ServoWindowCallbacks {
EmbedderCoordinates {
viewport: coords.viewport.to_box2d(),
framebuffer: coords.framebuffer,
window: (coords.viewport.size, Point2D::new(0, 0)),
screen: coords.viewport.size,
screen_avail: coords.viewport.size,
window_rect: DeviceIntRect::from_origin_and_size(Point2D::zero(), coords.viewport.size),
screen_size: coords.viewport.size,
available_screen_size: coords.viewport.size,
hidpi_factor: Scale::new(self.density),
}
}