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compositing: Support per-Painter operations and message handling (#40788)

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Currently, only the first `Painter` is used for all operations in the
`Compositor`. This change modifies the compositor API and message
handling to allow routing the operations to the correct `Painter` via a
provided `PainterId` or `WebViewId`.

This change is to enable support for per-`WebView`s `RenderingContext`s.

Testing: This change shouldn't change behavior, so existing WPT tests
should cover it.

---------

Signed-off-by: Mukilan Thiyagarajan <mukilan@igalia.com>
Signed-off-by: Martin Robinson <mrobinson@igalia.com>
Co-authored-by: Martin Robinson <mrobinson@igalia.com>
This commit is contained in:
Mukilan Thiyagarajan
2025-11-21 18:45:55 +05:30
committed by GitHub
parent 9c4db3b7d1
commit 90595e3570
13 changed files with 238 additions and 136 deletions
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8
components/script/script_thread.rs
View File

@@ -1100,7 +1100,7 @@ impl ScriptThread {
// steps per doc in docs. Currently `<iframe>` resizing depends on a parent being able to
// queue resize events on a child and have those run in the same call to this method, so
// that needs to be sorted out to fix this.
let mut webviews_generating_frames = HashSet::new();
let mut painters_generating_frames = HashSet::new();
for pipeline_id in documents_in_order.iter() {
let document = self
.documents
@@ -1196,17 +1196,17 @@ impl ScriptThread {
// > Step 22: For each doc of docs, update the rendering or user interface of
// > doc and its node navigable to reflect the current state.
if document.update_the_rendering().needs_frame() {
webviews_generating_frames.insert(document.webview_id());
painters_generating_frames.insert(document.webview_id().into());
}
// TODO: Process top layer removals according to
// https://drafts.csswg.org/css-position-4/#process-top-layer-removals.
}
let should_generate_frame = !webviews_generating_frames.is_empty();
let should_generate_frame = !painters_generating_frames.is_empty();
if should_generate_frame {
self.compositor_api
.generate_frame(webviews_generating_frames.into_iter().collect());
.generate_frame(painters_generating_frames.into_iter().collect());
}
// Perform a microtask checkpoint as the specifications says that *update the rendering*