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

From: Nikolaus Waxweiler
Subject: Re: [ft-devel] Variable fonts: hhea/typo/win metrics interpreted differently for instances compared to static fonts?
Date: Sat, 22 Dec 2018 13:43:54 +0000

I suggest FreeType be changed to respect OS/2 useTypoMetrics bit.

I'm gonna experiment with that.

GTK/Pango/Cairo just call into FreeType for metrics.

I'm confused.  What does "default outline" vs "default instance" mean?

By default outline I mean the outline that is displayed by ftview when you open a VF, before pressing `n` to cycle through the instances. I noticed that GTK apps display Cantarell-Regular using the default outlines but use e.g. the bold instance for -Bold. That's how I noticed the metrics difference.

There's also the question of whether MVAR tags should apply to whatever was used for ascent/descent. I think yes. And I'll implement that in HB.

What would you do when

1. the typo metrics are modified by the MVAR table
2. win metrics are modified
3. both are modified


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