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Re: [ft-devel] Variable fonts: hhea/typo/win metrics interpreted differe

From: Behdad Esfahbod
Subject: Re: [ft-devel] Variable fonts: hhea/typo/win metrics interpreted differently for instances compared to static fonts?
Date: Thu, 20 Dec 2018 12:33:34 -0500

On Thu, Dec 20, 2018 at 6:02 AM Nikolaus Waxweiler <address@hidden> wrote:
> This is certainly the most convenient solution for me since I have
> nothing to do on the FreeType side :-)

(As an aside, GTK/Pango seem to make the same mistake as TextEdit then, putting the line gap at the bottom instead of on both sides or something, so this would still look wrong even if FT would default to typo metrics for VFs)

lineGap should be put in between two neighboring lines only.

> Your question, however, is a fundamental one: Shall a VF font be
> always treated as VF, or is the `VFness' an optional feature?

I'd say the primary purpose of a VF is to be a VF, it is only optionally so for applications that don't know what a VF is. You'd think that using the hhea metrics for the default outlines would make sense in that case, but this still presents a corner case if the applications increases in smartness and suddenly the same font has different metrics 🤔


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