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script: add skeleton implementation of FontFace API (#35262)

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This patch implements the `FontFace` interface, but with some caveats

1. The interface is only exposed on `Window`. Support for Workers will
   be handled in the future.
2. The concept of `css-connected` `FontFace` is not implemented, so
   `@font-face` rules in stylesheets will not be represented in the DOM.
3. The constructor only supports using `url()` strings as source
   and `ArrayBuffer` and `ArrayBufferView` are not supported yet.

A skeleton implementation of the `load` method of `FontFaceSet` is also
implemented in this patch. The intention is to support some web pages
that don't load without this method.

Signed-off-by: Mukilan Thiyagarajan <mukilan@igalia.com>
This commit is contained in:
Mukilan Thiyagarajan 2025-02-19 11:20:01 +05:30 • committed by GitHub
parent 29e0fad21e
commit 56840e0a35
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52 changed files with 1160 additions and 551 deletions
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8
components/script_bindings/webidls/FontFaceSet.webidl
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@ -19,12 +19,13 @@ enum FontFaceSetLoadStatus { "loading" , "loaded" };
*/
// https://drafts.csswg.org/css-font-loading/#FontFaceSet-interface
[Exposed=(Window,Worker)]
[Exposed=(Window /*, Worker */)]
interface FontFaceSet : EventTarget {
// constructor(sequence<FontFace> initialFaces);
// setlike<FontFace>;
// FontFaceSet add(FontFace font);
[Pref="dom_fontface_enabled"]
FontFaceSet add(FontFace font);
// boolean delete(FontFace font);
// undefined clear();
@ -35,7 +36,8 @@ interface FontFaceSet : EventTarget {
// check and start loads if appropriate
// and fulfill promise when all loads complete
// Promise<sequence<FontFace>> load(DOMString font, optional DOMString text = " ");
[Pref="dom_fontface_enabled"]
Promise<sequence<FontFace>> load(DOMString font, optional DOMString text = " ");
// return whether all fonts in the fontlist are loaded
// (does not initiate load if not available)