225217 - Thai cannot be displayed.

Status: RESOLVED FIXED

(Core :: Layout: Text and Fonts, defect)

Description

[Tom Gewecke]

User-Agent:       Mozilla/5.0 (Macintosh; U; PPC; en-US; rv:1.2.1) Gecko/20021130
Build Identifier: All current mozilla browsers

If the OS X 10.3 version of the Thonburi Thai font is installed, no Mozilla-type
browser will display Thai.  Instead, they display the MacRoman characters
corresponding to the TIS-620/MacThai hex representing the underlying Thai text,
even when this text is encoded as UTF-8.  No problem can be found with the font,
but somehow it seems to trigger a bug in Mozilla's Thai rendering.  You can also
contact Deborah Goldsmith at Apple ([e-mail]) for her reading of the
problem. 

Reproducible: Always

Steps to Reproduce:
1.Make sure OS  X 10.3 Thonburi font is installed.
2.Point Mozilla browser at site with Thai (e.g. www.columbia.edu/kermit/utf8.html)
3.Try to read Thai text

Actual Results:  
I got MacRoman gibberish.

Expected Results:  
Displayed proper Thai script.

Comment 1

[Jungshik Shin]

Hmm. that's odd. Mozilla and Camino   on Mac OS X don't make use of ATSUI (well,
it uses it a little) so that I expect Thai text not to be properly shaped, but
hex string corresponding to MacThai/TIS620 encoding of the underlying text ?
Wow, that's ....
 
There's a bug filed for the CTL issue(bug 205476 and bug 121540). See also
http://www.mozilla.org/releases/mozilla1.5/known-issues-int.html

I wish I had a Mac so that I can fix this and other complex text rendering
issues on Mac OS X......

Anyway, Tom, could you attach a screenshot? 

re Thonburi font. Do you know what kind of font that is? Is it an AAT font with
mort table for Thai shaping? Do you know what CMap tables are included in the font? 

Comment 2

[Jungshik Shin]

Attachment: screenshot

relaying what Tom sent to me via email. guess he meant to post it here :-)

Comment 3

[Jungshik Shin]

Comment on attachment 135186 [details]
screenshot 

And he also wrote that thonburi font doesn't have any CMap table (wtih PID=3).
As he wrote, that shouldn't matter.

Comment 4

[Jungshik Shin]

Comment on attachment 135186 [details]
screenshot 

sorry for spamming.

Comment 5

[Jungshik Shin]

Tom, you don't have any problem using the font in other applications, do you?
(TextEdit and safari for instance. )  It looks like somehow Mozilla uses
MacRoman Cmap instead of MacThai Cmap. 

Comment 6

[Tom Gewecke]

The problem only occurs with Mozilla or any browser using the same engine, and
not with any other app as far as I know.

Comment 7

[Jim Rees]

Still a problem with Firefox 1.0. Safari renders correctly.

Is there a workaround?  Maybe a different font?

Comment 8

[Smokey Ardisson (offline for a while; not following bugs - do not email)]

(In reply to comment #7)
 
> Is there a workaround?  Maybe a different font?

Well, the work-around is to set your Thai font preferences to use Lucida Grande
(or XXX.serif, XXX.sans-serif, XXX.monospace to match the XXX.fantasy and
XXX.cursive, in which case they will fallback to Lucida Grande anyway).

See my bug 159809 comment 25 and following for my unschooled speculation.

Comment 9

[Smokey Ardisson (offline for a while; not following bugs - do not email)]

*** Bug 305394 has been marked as a duplicate of this bug. ***

Comment 10

[Smokey Ardisson (offline for a while; not following bugs - do not email)]

This was FIXED on trunk by cairo and the checkin for bug 299222.  There are still a couple of bugs on 10.5 with certain Thai fonts; they're filed.