[HarfBuzz] harfbuzz-ng progress report
nicolas_spalinger at sil.org
Tue May 26 02:38:43 PDT 2009
Behdad Esfahbod wrote:
> Hi Nicolas,
> As promised, here's a more detailed report. CC'ing HarfBuzz list actually.
> In April, I talked to my managers and they agreed to put me back on
> working on HarfBuzz for a while. I started getting back to the code and
> continuing my layout engine rewrite.
> At LGM Jonathan and I sat down and checked the code together, we then
> reviewed Pango's shaper APIs, current HarfBuzz shaping API, and
> expressed our designs, needs, and concerns (for Pango, Mozilla, XeTeX,
> etc). We believe we have a great design in mind in term of APIs which
> I'll start putting together soon and Jonathan will join me in filling in
> the bits.
> In the mean time, I finished my layout engine rewrite. A few minutes
> ago, I removed the old code. It's all in pango's git repo in the
> harfbuzz-ng branch. Gone is 16k lines of code which parsed the OpenType
> tables in memory. Replacement is 6k lines that uses mmap()ed fonts.
> Sanitization is still not implemented, so there's a bit more to do. But
> the code already does more than the old one. And IranNastaliq and other
> complex fonts I tested render correctly.
Thanks again the work in this area.
> Plans forward is:
> - Next week: I'll finish the layout rewrite. Adding sanity-checking
> code. May add stubs for BASE and JSTF tables too.
> - June: I'll start building the highlevel HarfBuzz API and prototyping
> the implementation, with Latin and Arabic only initially. Jonathan will
> hopefully join me in bringing Indic shapers together and filling in the
> rest of the shapers.
> - July first half: I'll be at GUADEC, talking about this and minor
> - July second half and August: I'll be pulling things together to ship
> next Pango stable version with an internal copy of the new HarfBuzz.
> Hopefully making the release stable and push out as a separate shared
> library early 2010.
> - Profit!
Looking forward to all that!
Nicolas Spalinger, NRSI volunteer
Debian/Ubuntu font teams / OpenFontLibrary
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