[HarfBuzz] Accent positioning with greek smallcaps

[Behdad Esfahbod]

Hi Georg,

I debugged the font.  It does look like a font issue to me.  The MarkBase
table for those accents and those bases has a null anchor for the base.
That's all I know.

behdad

On 13-01-07 02:06 AM, Georg Duffner wrote:
> Hello,
> 
> There seems to be something wrong with accent positioning in greek smallcaps
> with a ccmp feature enabled. In EB Garamond I’ve put together a feature (as
> stylistic set ss20) that decomposes all composed characters and mark and mkmk
> anchors are in place where needed. This all works nicely with Harfbuzz except
> for greek smallcaps as you can see at
> http://georgduffner.at/ebgaramond/greektests.html (with Firefox of course).
> Accents are placed in front of the letters at the bottom instead of atop of
> the letters. The last row of “Smallcaps” shows that latin smallcaps are fine,
> simple ones as well as stacked ones. I got the same results with hb-view
> (harfbuzz 0.9.9 on Arch Linux).
> 
> Results from hb-shape are:
> 
> 1: (ἂἅἇ)
> 1: <U+1F02,U+1F05,U+1F07>
> 1:
> [alpha.sc=0+549|uni0313.grksc=0 at -751,-630+0|gravecomb.grkstacksc=0 at -626,-630+0|alpha.sc=1+549|uni0314.grksc=1 at -751,-630+0|acutecomb.grkstacksc=1 at -626,-630+0|alpha.sc=2+549|uni0314.grkstacksc=2 at -684,-665+0|uni0342.sc=2 at -771,-489+0]
> 
> 
> and
> 
> 1: (áäấÄÖÜ)
> 1: <U+00E1,U+00E4,U+1EA5,U+00C4,U+00D6,U+00DC>
> 1:
> [a.sc=0+549|acutecomb.sc=0 at -319,65+0|a.sc=1+549|uni0308.sc=1 at -421,84+0|a.sc=2+549|uni0302.stacksc=2 at -389,65+0|acutecomb.stacksc=2 at -197,167+0|Adieresis.deu=3+684|Odieresis.deu=4+763|Udieresis.deu=5+738]
> 
> 
> I attach the results from hb-view.
> The options used are:
> --features="ss20","smcp"
> 
> You can find the font used in the tests at
> http://georgduffner.at/ebgaramond/tests/EBGaramond12-Regular.otf (it is too
> big for the limit of this list, even when compressed).
> 
> Please note that the testpage on the web uses a version of the font where the
> decomposition table is included in ccmp which I don’t want to because this
> should only be enabled when really necessary. But it doesn’t make a difference.
> 
> Best regards,
> Georg
> 
> 
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-- 
behdad
http://behdad.org/