[HarfBuzz] How to increase harfbuzz numerical precision

[Khaled Hosny]

Device tables depend on ppem, so despite the scale being set
on the font, you should still set the exact ppem.

On Tue, Jun 28, 2016 at 06:43:58PM -0400, Kelvin Ma 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/
> >





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