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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>
This commit is contained in:
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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8
components/script/script_thread.rs
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@ -1424,6 +1424,13 @@ impl ScriptThread {
)) => {
self.set_needs_rendering_update();
},
MixedMessage::FromConstellation(
ScriptThreadMessage::NoLongerWaitingOnAsychronousImageUpdates(pipeline_id),
) => {
if let Some(document) = self.documents.borrow().find_document(pipeline_id) {
document.handle_no_longer_waiting_on_asynchronous_image_updates();
}
},
MixedMessage::FromConstellation(ScriptThreadMessage::SendInputEvent(id, event)) => {
self.handle_input_event(id, event)
},
@ -1891,6 +1898,7 @@ impl ScriptThread {
msg @ ScriptThreadMessage::ExitFullScreen(..) |
msg @ ScriptThreadMessage::SendInputEvent(..) |
msg @ ScriptThreadMessage::TickAllAnimations(..) |
msg @ ScriptThreadMessage::NoLongerWaitingOnAsychronousImageUpdates(..) |
msg @ ScriptThreadMessage::ExitScriptThread => {
panic!("should have handled {:?} already", msg)
},