On Tue, Jun 28, 2016 at 6:56 PM, Kelvin Ma <[email protected]> wrote:
> No, i’m asking why harfbuzz has the concept of multiple fonts per face, if > that concept is useless in practice. > Helps if you ask without baking your own presumptions into the question. hb_font_t exists to hold all "configuration" needed. Adding that to hb_face_t would have made the face unusable from multiple threads. Such configuration is mainly the scale, and indeed, many clients shape with one font all the time. But there are other stuff. ppem is the other one. When "OpenType GX" variation fonts become a thing, the variation parameters will also be set on hb_font_t. > On Tue, Jun 28, 2016 at 6:54 PM, Behdad Esfahbod <[email protected]> > wrote: > >> You can't have both. Pick which you like. >> >> On Tue, Jun 28, 2016 at 6:43 PM, Kelvin Ma <[email protected]> >> 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 <[email protected]> >>> 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 <[email protected]> >>>> 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 >>>>> [email protected] >>>>> https://lists.freedesktop.org/mailman/listinfo/harfbuzz >>>>> >>>>> >>>> >>>> >>>> -- >>>> behdad >>>> http://behdad.org/ >>>> >>> >>> >> >> >> -- >> behdad >> http://behdad.org/ >> > > -- behdad http://behdad.org/
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