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compositor: Allow canvas to upload rendered contents asynchronously (#37776)

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Adds epoch to each WR image op command that is sent to compositor. The
renderer now has a `FrameDelayer` data structure that is responsible for
tracking when a frame is ready to be displayed. When asking canvases to
update their rendering, they are given an optional `Epoch` which denotes
the `Document`'s canvas epoch. When all image updates for that `Epoch`
are seen in the renderer, the frame can be displayed.

Testing: Existing WPT tests
Fixes: #35733

Signed-off-by: sagudev <16504129+sagudev@users.noreply.github.com>
Signed-off-by: Martin Robinson <mrobinson@igalia.com>
Co-authored-by: Martin Robinson <mrobinson@igalia.com>
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Sam 2025-08-29 12:04:41 +02:00 • committed by GitHub
parent 4700149fcb
commit 8beef6c21f
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36 changed files with 452 additions and 100 deletions
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5
components/shared/base/lib.rs
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@ -16,11 +16,14 @@ pub mod print_tree;
pub mod text;
mod unicode_block;
use malloc_size_of_derive::MallocSizeOf;
use serde::{Deserialize, Serialize};
use webrender_api::Epoch as WebRenderEpoch;
/// A struct for denoting the age of messages; prevents race conditions.
#[derive(Clone, Copy, Debug, Deserialize, Eq, Hash, Ord, PartialEq, PartialOrd, Serialize)]
#[derive(
Clone, Copy, Debug, Deserialize, Eq, Hash, Ord, PartialEq, PartialOrd, Serialize, MallocSizeOf,
)]
pub struct Epoch(pub u32);
impl Epoch {