How to sepcify extra unicode glyph property like Bidi_Class?

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emoory
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Joined: Mon Oct 18, 2021 9:58 am

How to sepcify extra unicode glyph property like Bidi_Class?

Post by emoory »

I used private area for adding some arabic glyphs, but the default writing direction for the glyphs linked to code-points in the private area is defaulted to L according to unicode specifications. I am asking about where i can specify a value for the Bidi_Class property to override the defaulted value?..
in font lab i used to put it in the note box inside the glyph properties panel, like this: (Bidi_Class=AL).
I tried to do the same in font creator, but nothing changed in the exported font..
So please guide me about this situation.
Erwin Denissen
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Re: How to sepcify extra unicode glyph property like Bidi_Class?

Post by Erwin Denissen »

There is no way you can set this in a font. Sure you can override several character properties so the preview in FontCreator will use RTL, but it will always show LTR in external software.

To make it work in external software you need to use Arabic characters and use substitutions to your other glyphs by means of OpenType layout features.
Erwin Denissen
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