Allow GSUB extension lookup tables to wrap reverse chaining lookup tables

HinTak / Font-Validator

Font Validator is a tool for testing fonts prior to release. This testing ensures that fonts meet Microsoft's high quality standards and perform exceptionally well on Microsoft's platform.

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Allow GSUB extension lookup tables to wrap reverse chaining lookup tables #36

Closed camertron closed 6 years ago

camertron commented 6 years ago

I haven't been able to find anything in the documentation that says GSUB extension lookup tables can't wrap reverse chaining lookup tables, but for some reason the code doesn't consider them when validating.

camertron commented 6 years ago

Case 7 is the lookup type associated with extensions. The spec explicitly states, "The extensionLookupType field must be set to any lookup type other than 7."

HinTak commented 6 years ago

Thanks for the explanation. Merged!

camertron commented 6 years ago

Thanks @HinTak!

HinTak commented 6 years ago

Thank you @camerton!