Fixup sub/superscript metric fallback logic #1823
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If there are explicit values in a font for the 'Os2Subscript___' metrics, we want to reuse those for the corresponding superscript metrics. This means that we need to query metrics in this routine, which ran into borrowck issues due to the long-lived closure that had a mutable ref to self. To work around that, I've replaced that closure with a macro.
wmedrano
approved these changes
Dec 15, 2025
rsheeter
reviewed
Dec 15, 2025
| let units_per_em = units_per_em as f64; | ||
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| let mut set_if_absent = |metric, value| self.set_if_absent(metric, pos.clone(), value); | ||
| // a macro instead of a closure to avoid borrowck |
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This smells, I didn't spot it at a glance, why can't this be normal code?
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Personally, I think calling self.set_if_absent(metric, pos.clone(), value); directly is fine.
- set_if_absent can also take an
Into<Cow<NormalizedLocation>>if you want to avoid the explicit clone
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The whole reason this exists afaict is because always calling self.set ends up just... being a bunch of extra lines? And the closure doesn't work with this patch because you can't call self.get because the closure has an &mut ref to self.
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If there are explicit values in a font for the 'Os2Subscript___' metrics, we want to reuse those for the corresponding superscript metrics.
This means that we need to query metrics in this routine, which ran into borrowck issues due to the long-lived closure that had a mutable ref to self. To work around that, I've replaced that closure with a macro.