RE: Synthesize cmap from a TrueType Font

[Ciaran Kearney]

Hello Werner,

Thank you for your quick response.

Hopefully, the last question, is there a way for me to know at runtime, if 
FreeType has created a new cmap? Is a flag set?

Thanks again,
Ciaran

-----Original Message-----
From: Werner LEMBERG <wl@gnu.org>
Sent: Wednesday, August 7, 2024 4:56 PM
To: Ciaran Kearney <ciaran.kearney@gonitro.com>
Cc: freetype@nongnu.org
Subject: Re: Synthesize cmap from a TrueType Font


Hello Ciaran,


> Just a follow up about the issue I raised earlier:
> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgitl
> ab.freedesktop.org%2Ffreetype%2Ffreetype%2F-%2Fissues%2F1289&data=05%7
> C02%7Cciaran.kearney%40gonitro.com%7C21f96151c0da4d8ea01808dcb6f98503%
> 7Ce56492bb794a4d6ea0350aced11c54d6%7C0%7C0%7C638586430211037998%7CUnkn
> own%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwi
> LCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=wl0n%2Fp1Jeg7HhwCclsdySKlJSY%2FGTPeo
> e6uaX6c8ZU8%3D&reserved=0
>
> The new synthesize cmap seems to be incorrect. The wrong glyphs are
> used.

Assuming that the 'Apple Roman' encoding is correct (which you seem to imply), 
this is a problem of the font - the glyph names are completely wrong.  In other 
words, the font is buggy.

> Is there a reason why we want to synthesize a new cmap?

A Unicode cmap is what virtually everybody wants, since you don't have to 
switch around cmaps.

> Can I ask FreeType not to synthesize as the document doesn't render
> correctly.

Well, FreeType expects valid fonts.  If you want to make it handle invalid 
fonts you have to maintain a blacklist to catch them and explicitly select the 
desired cmap.  If this is not possible, consider a compilation of the library 
without defining `FT_CONFIG_OPTION_POSTSCRIPT_NAMES`.


    Werner

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