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Re: the hdmx stuff

From: Werner LEMBERG
Subject: Re: the hdmx stuff
Date: Fri, 10 Dec 2021 07:35:02 +0000 (UTC)

Hello Alexei,

> To make `hdmx` easily accessible, I propose the following.
> 1) Use internal FT_LOAD_ADVANCE_ONLY in truetype to quickly exit if
> `hdmx` is deemed usable and size matches.
> 2) "quickly" means from tt_loader_init. We will relocate the bulk of
> the `hdmx` code there from compute_glyph_metrics.
> 3) INSTCTRL needs to be confined to CVT as OpenType specs require.


> Do you know how to make INSTCTRL no-op anywhere except CVT?
> Otherwise it is rather strange to reconsider each time TT_RunIns
> runs under v40.

I think it shouldn't be a no-op but rather cause an error, no?

  if ( exc->iniRange != tt_coderange_cvt )
    exc->error = FT_THROW( ... error ... );


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