841313 - Update harfbuzz to pick up new SEAsian shaping support

Status: RESOLVED FIXED

(Core :: Graphics: Text, defect)

Description

[Jonathan Kew [:jfkthame]]

HarfBuzz now has a Myanmar shaper that matches Win8 Uniscribe behavior, and additional support for some other SEAsian scripts. So we should take an update to pick up these features. This also includes the fix for a significant problem in Devanagari shaping (incorrect formation of the eyelash-Ra form).

Comment 1

[Jonathan Kew [:jfkthame]]

Attachment: update harfbuzz to upstream commit f22b7e77783fa2f44365e0fe6413c4474c07048d

Comment 2

[Jonathan Kew [:jfkthame]]

Pushed a tryserver job to confirm this doesn't break existing reftests:
https://tbpl.mozilla.org/?tree=Try&rev=bea2a7145d0b

Comment 3

[Jonathan Kew [:jfkthame]]

Pushed https://hg.mozilla.org/integration/mozilla-inbound/rev/13882bd74680

I updated the patch to upstream commit a0cb9f33ee064628debe8e848094dfd661334640, to pick up one more tiny Indic fix; carrying over r=jdaggett.

(As of today, harfbuzz master includes further work that will improve the handling of default-ignorable characters, ZWJ/ZWNJ, etc, but I don't want to take that until it's had a little more testing/stabilization upstream. So I expect we'll take a further update in a few weeks' time.)

Comment 4

[Ryan VanderMeulen [:RyanVM]]

https://hg.mozilla.org/mozilla-central/rev/13882bd74680