[HarfBuzz] How to increase harfbuzz numerical precision

[Kelvin Ma]

No, i’m asking why harfbuzz has the concept of multiple fonts per face, if
that concept is useless in practice.

On Tue, Jun 28, 2016 at 6:54 PM, Behdad Esfahbod <behdad at behdad.org> wrote:

> You can't have both.  Pick which you like.
>
> On Tue, Jun 28, 2016 at 6:43 PM, Kelvin Ma <kelvinsthirteen at gmail.com>
> wrote:
>
>> so that’s the only way huh…
>> doesn’t that kind of defeat the purpose of hb.font_create() and having
>> many scaled versions of the same font? You would only ever need one font of
>> each face, scaled to the UPEM, if the fontsize was to be applied externally
>> after shaping already occurred.
>>
>> On Tue, Jun 28, 2016 at 5:51 PM, Behdad Esfahbod <behdad at behdad.org>
>> wrote:
>>
>>> HarfBuzz coordinates work in a int32 space.  You are free to set
>>> whatever scales you want on the font.  For example, use 6 or 8 or 10 or 16
>>> bits of sub-pixel precision by multiplying your scale by a number.
>>>
>>> On Tue, Jun 28, 2016 at 4:57 PM, Kelvin Ma <kelvinsthirteen at gmail.com>
>>> wrote:
>>>
>>>> It appears that harfbuzz rounds all decimals to integers when giving
>>>> glyph advances and offsets. This is causing some ugly misalignment problems
>>>> in arabic shaping, as well as latin cursive fonts. (see pictures)
>>>>
>>>> [image: Inline image 1]
>>>>
>>>> [image: Inline image 2]
>>>>
>>>> [image: Inline image 3]
>>>> How do I get harfbuzz to preserve the floats?
>>>>
>>>> _______________________________________________
>>>> HarfBuzz mailing list
>>>> HarfBuzz at lists.freedesktop.org
>>>> https://lists.freedesktop.org/mailman/listinfo/harfbuzz
>>>>
>>>>
>>>
>>>
>>> --
>>> behdad
>>> http://behdad.org/
>>>
>>
>>
>
>
> --
> behdad
> http://behdad.org/
>
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