WOFF OpenType fonts *should* work for all scripts

[GoogleCodeExporter]

http://hacks.mozilla.org/2009/06/beautiful-fonts-with-font-face/

The Arabic example should download the OpenType font so it works with Harfbuzz. 
Instead, the ligatures still do not appear correctly.

Original issue reported on code.google.com by classi...@floodgap.com on 9 Nov 2010 at 4:50

[GoogleCodeExporter]

Unfortunately, this message

http://www.mail-archive.com/harfbuzz@lists.freedesktop.org/msg00321.html

implies that Harfbuzz (as it is currently in Fx4) does not do ligatures either. 
However, I have altered gfx/thebes to ignore AAT fonts and prefer OpenType such 
that when/if Mozilla enables this support it will "just work." Marking Fixed on 
that basis and adding to TechnicalDifferences.

Original comment by classi...@floodgap.com on 20 Nov 2010 at 6:24

• Changed state: Fixed

[GoogleCodeExporter]

Hangul seems to be affected by this as of beta 8.

Original comment by classi...@floodgap.com on 5 Dec 2010 at 6:37

[GoogleCodeExporter]

Review of font support:

- We are perfectly capable of rendering Hangul; there is an artificial 
limitation in gfxUnicodeProperties::ScriptShapingLevel() after beta 8 that 
turned it off. Hangul seems to render just fine, so that code has been blocked 
out and all scripts are allowed, even ones that Mozilla thinks won't work. This 
is wrong right now but will be right when Harfbuzz gets better. This also turns 
back on Hebrew.

- The OTS code requires us to set 
gfx.downloadable_fonts.sanitize.preserve_otl_tables to true for any advanced 
shaping, including the examples on

http://hacks.mozilla.org/2010/11/firefox-4-font-feature-support/

If we don't enable them, ligatures and other font features are absent. We don't 
use a platform shaper (we are all Harfbuzz), so we expose no attack surface 
this way that I can find. Setting the pref to true is now the default in beta 
8, but can be turned on in beta 7 (the consequences of which are not clear to 
me, so I am not recommending it).

With this pref on and the fixes above, plus the updated Harfbuzz in beta 8, the 
Arabic example at

http://people.mozilla.org/~jdaggett/demos/arabicfont.html

finally works, with correct ligatures. On that basis, Verified.

Original comment by classi...@floodgap.com on 6 Dec 2010 at 5:49

• Changed state: Verified