Re: Cairo font selection for Ethiopic

[Stephen Berman <stephen.berman@gmx.net>]

On Fri, 21 Jun 2019 10:54:03 +0900 YAMAMOTO Mitsuharu <mituharu@math.s.chiba-u.ac.jp> wrote:

> On Fri, 21 Jun 2019 04:30:09 +0900,
> Stephen Berman wrote:
>>
>> I don't know if this is a bug or just the way Cairo works.  On two
>> different GNU/Linux systems I have built Emacs both --with-cairo and
>> without.  The non-Cairo builds use Xft as the font backend.  On those
>> builds the Ethiopic scripts (Amharic and Tigrinya) in HELLO are
>> displayed with the Goha-Tibeb Zemen font.  In the Cairo builds this font
>> is not used for these scripts; instead, on one system they are displayed
>> with a mix of GNU Unifont and mutt-clearlyu, and on the other system,
>> which lacks these fonts, only hex boxes are displayed.  Is there
>> something about Goha-Tibeb Zemen that is incompatible with Cairo?
>
> Goha-Tibeb Zemen does not have glyphs for ASCII printables that the
> ftcr font backend relies on computing minimum/average/space width when
> opening the font.  The patch below should simulate the Xft behavior.

Thanks.  I rebuilt Emacs --with-cairo with this patch but the Ethiopic
scripts in HELLO are still not displayed with Goha-Tibeb Zemen but also
not with the same fonts as before: now they are uniformly displayed with

-Misc-Misc Fixed Wide-normal-normal-normal-ja-13-*-*-*-c-120-iso10646-1

Is this the intended result of the patch?

Steve Berman