[HarfBuzz] Accent positioning with greek smallcaps

[Georg Duffner]

Hi Behdad,

which tool did you use for debugging? With Fontforge I can’t find the 
null anchor you found. The source featurefile as well as the featurefile 
extracted from the font both show correct values for the anchors and inn 
Fontforge’s metrics view, the results look as expected. What’s more, 
XeTeX and LuaTeX position the accents correctly (they fail at other 
places though).

Georg

Am 2013-01-07 10:25, schrieb 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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>>
>


-- 
EB Garamond: http://www.georgduffner.at/ebgaramond