Re: Tamil fonts (Was: bug#55745: [PATCH] Add support for the Hanifi Rohingya script)

[Eli Zaretskii <eliz@gnu.org>]

> From: समीर सिंह Sameer Singh <lumarzeli30@gmail.com>
> Date: Wed, 1 Jun 2022 22:25:52 +0530
> Cc: Eli Zaretskii <eliz@gnu.org>, emacs-devel@gnu.org
> 
>  This is a sub-optimal solution IMHO.  There will always be cases where
>  a script is split into multiple Unicode blocks, probably mapped to
>  different fonts.  AFAICS, the Tamil supplement characters don't
>  interact typographically with normal Tamil characters, so a two-font
>  solution in this case is valid.  In case my assumption is invalid you
>  should submit a bug to the Noto project :-)
> 
> I agree it is somewhat sub optimal, but Emacs does not differentiate between supplement and "base"
> characters, so setting different fonts for both of them does not seem possible.

Of course, it's possible: set-fontset-font can accept ranges of
codepoints and use different font for each range.  It doesn't have to
accept only script names.

> There also seems to be no font which supports both Tamil and its supplement characters OOTB.

That part is indeed sub-optimal, but not a catastrophe if they are
displayed independently, i.e. there are no composition rules that
cross the boundary between the blocks.