Re: Inserting ே and க்ஷ without the dotted circle

[Eli Zaretskii <eliz@gnu.org>]

> Date: Mon, 9 Nov 2015 23:14:39 +0530
> From: Shakthi Kannan <shakthimaan@gmail.com>
> 
> I am using fonts-lohit-taml-classical 2.5.3-2 font on a Ubuntu 14.10
> system. With Tamil Unicode character and GNU Emacs 24.5.1, I am able to
> enter  ே and க்ஷ (க்ஷ = க + ் + ஷ) separately.
> 
> #1 I have a word where I need both the characters put together, but,
> without the dotted circle. How can this be done?

AFAIK, only by turning off auto-composition-mode.  That mode is on by
default.  Of course, if you do that, you won't get க்ஷ by typing
க + ் + ஷ.

> I can open the font sources using FontForge:
> 
> 
> https://fedorahosted.org/releases/l/o/lohit/lohit-tamil-classical-2.5.3.tar.gz
> 
> and when I click on U+0BC7, I see the glyph for ே, but, without the dotted
> circle. But, the definition in Unicode has the dotted circle:
> 
>   http://www.charbase.com/0bc7-unicode-tamil-vowel-sign-ee

So Emacs behaves correctly according to Unicode.

> #2 Where is this behaviour defined for such characters?

In lisp/language/indian.el, search for "tamil-composable-pattern".

> #3 Suppose I add a new glyph to one of the available Unicode slots in the
> font sources, where in Emacs should this be defined in order to use the
> same?

Sorry, I don't understand the question.  You want this new glyph to be
available for a codepoint that is different from U+0BC7?  Or do you
want something else?