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canvas: Make OffscreenCanvas transferable (without placeholder) (#37872)

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Follow the specification and make OffscreenCanvas objects are
transferable,
but not in case if there are a weak reference to placeholder canvas
element.
To handle it properly need to implement dedicated frame
provider/dispatcher
between canvas element (script thread) and offscreen canvas (dedicated
worker thread).

https://html.spec.whatwg.org/multipage/#the-offscreencanvas-interface:transferable-objects

Testing: Improvements in the following tests
-
html/canvas/element/drawing-images-to-the-canvas/2d.drawImage.detachedcanvas.html
-
html/canvas/offscreen/manual/convert-to-blob/offscreencanvas.convert.to.blob*
-
html/canvas/offscreen/manual/the-offscreen-canvas/offscreencanvas.transfer*
-
html/infrastructure/safe-passing-of-structured-data/transfer-errors.window.js

Part of #24276

Signed-off-by: Andrei Volykhin <andrei.volykhin@gmail.com>
This commit is contained in:
Andrei Volykhin 2025-07-08 17:47:29 +03:00 • committed by GitHub
parent c3f441d7ab
commit 4054f9a5a0
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17 changed files with 159 additions and 60 deletions
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6
tests/wpt/meta/html/infrastructure/safe-passing-of-structured-data/transfer-errors.window.js.ini vendored
View file

@ -8,11 +8,5 @@
[Serialize should throw before a detached ImageBitmap is found]
expected: FAIL
[Serialize should make the OffscreenCanvas detached, so it cannot be transferred again]
expected: FAIL
[Serialize should throw before a detached OffscreenCanvas is found]
expected: FAIL
[Cannot transfer OffscreenCanvas detached while the message was serialized]
expected: FAIL