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canvas: Make 2D context state creation failable and use dom_canvas_backend pref for backend selection (#38310)

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Before script just crashed in those cases because IPCSender was dropped,
now we send `None` to tell script about the failure and fail getContext
or registerPainter accordingly.
This PR also unifies `dom_canvas_{backends}_enabled` prefs into
`dom_canvas_backend` which is more flexible in multi-backends scenarios.

Reviewable per commit.

Testing: Added servo specific WPT test.

---------

Signed-off-by: sagudev <16504129+sagudev@users.noreply.github.com>
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sagudev 2025-07-28 11:13:07 +02:00 • committed by GitHub
parent 93d234d270
commit ae69646371
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17 changed files with 116 additions and 61 deletions
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4
components/script/dom/paintworkletglobalscope.rs
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@ -563,7 +563,9 @@ impl PaintWorkletGlobalScopeMethods<crate::DomTypeHolder> for PaintWorkletGlobal
}
// Step 19.
let context = PaintRenderingContext2D::new(self, CanGc::note());
let Some(context) = PaintRenderingContext2D::new(self, CanGc::note()) else {
return Err(Error::Operation);
};
let definition = PaintDefinition::new(
paint_val.handle(),
paint_function.handle(),