Re: Cocoa emacs renders Unicode combining diacritics improperly

[Dan Maftei <ninestraycats@gmail.com>]

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On Mon, Jul 16, 2012 at 9:16 PM, Peter Dyballa <Peter_Dyballa@web.de> wrote:

>
> Am 16.07.2012 um 19:09 schrieb Dan Maftei:
>
> > Pre-composed characters (e.g. 0xf1, ñ) render perfectly, but combining
> > diacritics (e.g. n\x303) render the character oddly. Namely, the
> diacritic
> > very miniscule, and is not placed directly above the main character (but
> > not entirely to the left or right either). However, a single glyph IS
> > created, since C-f and C-b skip over the entire rendered character.
>
> Try again with a font having the COMBINING accents! You probably used an
> inadequate font so that GNU Emacs had to use two different fonts. Which you
> can check yourself by putting the text cursor on the basic character or on
> the accent and typing each time C-u C-x =.
>

I was not clear enough.

It is not possible to "put the text cursor on the basic character or on the
accent" because the two are combined.

My font is apple-monaco for both pre-composed and compositional characters.

I have uploaded images of both compositional (http://i.imgur.com/yWPmv.png)
and pre-composed (http://i.imgur.com/5Kfy2.png) characters. I've included
describe-char output as well.

Notice: the combining diacritic is rendered extremely small, and
off-center. It doesn't even look like a tilde in the final glyph.


>
> For tests you could try to use Lucida Grande, a quite rich font. A good
> mono-spaced font is DejaVu Sans Mono. Lucida Sans Typewriter from Java is
> also a pretty good candidate. (Create a library in Font Book and populate
> it with the TT fonts!)
> np
>

The default Cocoa emacs font (apple-monaco) properly renders combining
characters in TextEdit. Nevertheless, I tried Lucida Grande, and it did not
fix the issue.

Cheers,
Dan

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