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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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2
components/shared/webgpu/messages/recv.rs
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@ -6,6 +6,7 @@
//! (usually from the ScriptThread, and more specifically from DOM objects)
use arrayvec::ArrayVec;
use base::Epoch;
use base::id::PipelineId;
use ipc_channel::ipc::{IpcSender, IpcSharedMemory};
use pixels::IpcSnapshot;
@ -162,6 +163,7 @@ pub enum WebGPURequest {
context_id: WebGPUContextId,
texture_id: TextureId,
encoder_id: CommandEncoderId,
canvas_epoch: Option<Epoch>,
},
/// Obtains image from latest presentation buffer (same as wr update)
GetImage {