revsub/useExtension support by application

agisaak's picture

Hi all,

I'm trying to find information on which applications support different lookup types. There seems to be lots of sources of info on which applications support which OpenType features, but I haven't been able to find a source of info on the types of OpenType lookups which are supported.

In particular, I am interested in which application support GSUB type 7 lookups (lookups with the useExtension flag, i.e. those with 32-bit offsets) and GSUB type 8 lookups (reversesub lookups).

Also, if a font contains these types of lookups and an application does not support them, will applications simply not process the relevant subtables, or will it potentially cause some applications to crash (or bring about Armageddon or some other equally undesirable result)?

Unfortunately, I don't have a budget which allows me to invest in a large number of test applications so I was hoping that there might be a summary out there somewhere.

TIA,
André

[Thread renamed for clarity]

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