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canvas: Add OffscreenCanvas 'convertToBlob' method (#37786)

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Follow the HTML speficication and add missing 'convertToBlob' method
to OffscreenCanvas interface.

https://html.spec.whatwg.org/multipage/#dom-offscreencanvas-converttoblob

Testing: Improvements in the following tests
-
html/canvas/offscreen/manual/convert-to-blob/offscreencanvas.convert.to.blob*
-
html/canvas/offscreen/manual/wide-gamut-canvas/2d.color.space.p3.convertToBlobp3.canvas.html

Fixes: #24272

Signed-off-by: Andrei Volykhin <andrei.volykhin@gmail.com>
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Andrei Volykhin 2025-07-04 09:58:12 +03:00 • committed by GitHub
parent 3ba5b89ef2
commit 6ba54e4d79
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11 changed files with 187 additions and 187 deletions
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4
components/script_bindings/webidls/OffscreenCanvas.webidl
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@ -8,7 +8,7 @@ OffscreenRenderingContext;
dictionary ImageEncodeOptions {
DOMString type = "image/png";
unrestricted double quality = 1.0;
unrestricted double quality;
};
//enum OffscreenRenderingContextId { "2d", "webgl", "webgl2" };
@ -21,5 +21,5 @@ interface OffscreenCanvas : EventTarget {
[Throws] OffscreenRenderingContext? getContext(DOMString contextId, optional any options = null);
//ImageBitmap transferToImageBitmap();
//Promise<Blob> convertToBlob(optional ImageEncodeOptions options);
Promise<Blob> convertToBlob(optional ImageEncodeOptions options = {});
};