bug#22699: 25.0.91; Accented characters truncated with DejaVu Sans Mono

[Andy Moreton]

On Tue 23 Feb 2016, Werner LEMBERG wrote:

>>> As mentioned earlier, you might check the `Aringacute' glyph in
>>> arial.ttf – if it is cropped, you probably have an old engine that
>>> suffers the usWin{Ascent,Descent} limitations.
>> 
>> That one is not cropped in Emacs, at least AFAICS.
>
> OK, then maybe the MS people have fixed this meanwhile.
>
> Anyways, I've now looked at the TrueType bytecode of the `aring' glyph
> in DejaVuSansMono-Bold.ttf font (v2.34), and it confirms my guess: At
> 12ppem (this is 9pt at 96dpi), the bytecode moves the `ring' subglyph
> up one pixel so that the top pixel row is outside the range spanned up
> by usWin{Ascent,Descent}.

The Bold style displays properly though - it is the Book style that clips
the top of the glyph.

> For the sake of compatibility with Windows, I recommend that the
> DejaVu people slightly increase `usWinAscent'.
>
> Please forward this to the DejaVu bug tracker :-)

Indeed. Thanks for looking at this.

    AndyM