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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
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commit 8beef6c21f
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36 changed files with 452 additions and 100 deletions
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4
components/shared/constellation/lib.rs
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@ -57,6 +57,10 @@ pub enum EmbedderToConstellationMessage {
/// Requests that the constellation instruct script/layout to try to layout again and tick
/// animations.
TickAnimation(Vec<WebViewId>),
/// Notify the `ScriptThread` that the Servo renderer is no longer waiting on
/// asynchronous image uploads for the given `Pipeline`. These are mainly used
/// by canvas to perform uploads while the display list is being built.
NoLongerWaitingOnAsynchronousImageUpdates(Vec<PipelineId>),
/// Dispatch a webdriver command
WebDriverCommand(WebDriverCommandMsg),
/// Reload a top-level browsing context.