Parse locally installed font (rather than local font file)

[johnthesoftwareathome]

My ignorance of fonts in Javascript is almost complete but I have managed to extract glyph data from the Google font set using opentype.js,and display it using WebGL as part of a feasibility check for the use of OpenGL in a browser for some robotic work (www.itemkey.co.uk).

I know that in general it's not possible to use local font information for security reasons, but it is possible to check if specific fonts are locally loaded....

document.fonts.check(10px system-ui) for instance will return true I imagine for all browsers for the system-ui font.

Is it possible to parse such a font (which presumably must include its glyph data) through opentype returning the same object as a fetch on a URL?

Thanks

John

[Connum]

Please see #571.

[johnthesoftwareathome]

Sarah, With the exception of Chrome using https, 'window.queryLocalFonts()' is not available. In a general sense the answer to this is probably 'no you can't, it's explicitly prevented by browser security'. Is this a reasonable conclusion? Thanks John

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On 26/01/2025 16:50, Sarah C. Groß wrote: Please see #571 <#571>. — Reply to this email directly, view it on GitHub <#787 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AIMJYZC2EU2VJ2EODJBEHDT2MUG6RAVCNFSM6AAAAABV4TPYDSVHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTCOJVHE4DSNQ>. You are receiving this because you authored the thread.Message ID: ***@***.***>

[Connum]

In a general sense the answer to this is probably 'no you can't, it's explicitly prevented by browser security'. Is this a reasonable conclusion?

Absolutely (unfortunately)!

[johnthesoftwareathome]

Ok. It's good to know that I'm not a complete idiot and have some grasp. I'll work round this. Thanks again

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On 27/01/2025 09:53, Sarah C. Groß wrote: In a general sense the answer to this is probably 'no you can't, it's explicitly prevented by browser security'. Is this a reasonable conclusion? Absolutely (unfortunately)! — Reply to this email directly, view it on GitHub <#787 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AIMJYZGTJQEDZWBWYNFEFLL2MX6Z3AVCNFSM6AAAAABV4TPYDSVHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTCOJWG4YDCOA>. You are receiving this because you authored the thread.Message ID: ***@***.***>