[HarfBuzz] pango and harfbuzz

[Felipe Heidrich]

Thank you Behdad, that is important information to me.

It seems I will need a mix of pango+harfbuzz.
pango to itemzime+font-fallback and harfbuzz for shaping (with font
features support, linear layout).

Do you happen to know what the browsers (firefox, webkit) are doing  ?


Back to rendering, as far as glyph rasterization goes, is there anything I
can do with cairo/pangocairo that I can't do directly with freetype ?
Basically I need  8bpp grayscale and 24bpp LCD masks (which I'll upload to
an opengl texture).
Ideally I need to produce subpixel text positioned glyphs (at 0, .33, .66).

Thanks
Felipe



On Tue, Jun 11, 2013 at 5:41 PM, Behdad Esfahbod <behdad at behdad.org> wrote:

> On 13-06-10 06:04 PM, Felipe Heidrich wrote:
> > Hello,
> >
> > I'm evaluating pango and harfbuzz to use with javafx and I have a couple
> > questions:
> >
> > 1) Advance typographic features (i.e
> > http://dev.w3.org/csswg/css-fonts/#font-rend-props)
> > In pango I was only able to find support for small caps (in PangoVariant)
>
> Correct.  Pango doesn't currently have API to enable those.  Though, it's
> straightforward to add.
>
>
> > In harfbuzz, hb_shape() takes an array of hb_features_t. I suppose any
> feature
> > available in the font can be selected using harfbuzz ?
>
> Yes.
>
>
> > 2) glyph advances
> > Is there any difference between glyph advances produced harfbuzz and
> pango ?
> > I would like, if possible, to use linear (non-hinted) advances.
>
> No.  With HarfBuzz you have more control over things, but if you disable
> hinting and request a font at a large size you are good to go.
>
>
> > Note that I started with pango since it provides a complete solution
> including
> > -itemizer (not mandatory for me)
> > -shaper
> > -font fallback (I think)
> > -glyph metrics (xMax, yMax, xMin, yMin)
> > -glyph images
> > -glyph outlines
>
> Correct.
>
>
> > Turns out that for most of what I'm doing I also need either cairo or
> freetype
> > to work with pango.
> > I'm not 100% on this one, but using cairo does not provide anything
> extra (as
> > it seems cairo uses freetype).
> > So instead of using pango+cairo or (pango+freetype) I could directly use
> > freetype (for glyph images/outlines/metrics) and harfbuzz (for shaping
> complex
> > text).
>
> You can.  But you have to deal with itemizing, bidi, font fallback, etc,
> yourself.
>
> behdad
>
>
> > Please advise.
> >
> > Thank you
> > Felipe
> >
> >
> >
> > _______________________________________________
> > HarfBuzz mailing list
> > HarfBuzz at lists.freedesktop.org
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> >
>
> --
> behdad
> http://behdad.org/
>
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