180112 - Arabic combining diacritical marks are rendered separately, not above or below the characters

Status: RESOLVED WORKSFORME

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

Description

[Roland Unger]

User-Agent:       Mozilla/4.78 [en] (Win98; U)
Build Identifier: 2002101612

As a part of the Arabic Unicode plane, some combining diacritical marks (for 
instance Fatha, Kasra and so on) are defined. Mozilla does not render a 
combination, but two separate characters.

Reproducible: Always

Steps to Reproduce:
1.See attached test file.
2.
3.

Comment 1

[Roland Unger]

Attachment: HTML file with Arabic text and diacritical marks

UTF-8 coded test file containing an English title and three Arabic words
(shukran, kurrasa, mu'allim) with their diacritical marks.

Comment 2

[Niklas Dougherty]

This is because of Mozilla's severe limitations rendering Unicode. See bug
157967 for details.

Comment 3

[Tim Freedom]

This is a critical bug for proper Arabic - any further status and/or movement to
eradicate this problem (its been awhile since it was looked into) ?

Comment 4

[Ossama Khayat]

This works fine in Windows.
The problem still in exists in Linux though.
I'll try to attach a screenshot using Linux and the latest nightly build.

Comment 5

[Ossama Khayat]

Attachment: Screenshot in Windows showing display of Arabic diacritics fine

As you can see in the shot, I'm using a nightly build (20030924) and Windows
XP.

Comment 6

[Ossama Khayat]

Attachment: A test case in RH9 using Mozilla 1.4

The first line has broken words on diacritics, but not the second line (where
there isn't a font specified!).

Comment 7

[Ossama Khayat]

Attachment: A screenshot of the previous (test2.html) test page.

This is how it look on my RH9 machine. BTW, I have fonts-arabic RPM package
installed as well as ae_fonts.

Comment 8

[Pierrick Brihaye]

Additional comment #5 says :

>Screenshot in Windows showing display of Arabic diacritics fine

This is *not* true on Windows 98 (either using Mozilla 1.4, 1.5RC2 or NS 7.02).

Comment 9

[Roland Unger]

Attachment: HTML file with Arabic text and diacritical marks - extended -

UTF-8 coded test file containing an English title and three Arabic words
(shukran, kurrasa, mu'allim) with their diacritical marks. The text is
written twice; the second time with the font Traditional Arabic to test
OpenFont properties

Comment 10

[Roland Unger]

Attachment: A screenshot of the previous (test.html) test page - Win 98 - M1.5 RC2

In case of Windows 98, Arabic combining diacritical marks are rendered
separately.
Arabic Support installed. Correct working with IE 6 and MS Word

Comment 11

[Roland Unger]

Attachment: A screenshot of the previous (test.html) test page - Win 2000 - M1.5 RC2

In case of Windows 2000 and Mozilla 1.5 RC2 it works correctly.

Comment 12

[Asa Dotzler [:asa]]

*** Bug 181669 has been marked as a duplicate of this bug. ***

Comment 13

[Simon Montagu :smontagu]

*** Bug 257101 has been marked as a duplicate of this bug. ***

Comment 14

[John O'Shea]

Attachment: Screenshot of unicode UTF-8 vietnamese characters

Attached screenshot shows combining diacriticals not displaying correctly in a
utf-8-encoded Vietnamese file. Same file displays correctly in Safari.

Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; rv:1.7.3) Gecko/20040913
Firefox/0.10

Comment 15

[Vít Zvánovec]

Attachment: Both bad and good rendering

Comment 16

[Uri Bernstein]

*** Bug 306068 has been marked as a duplicate of this bug. ***

Comment 17

[Uri Bernstein]

Please note that two of the recent dupes were for non en-US (French and Czech)
installations on Windows 2000/XP.
Changing OS to "All".

Comment 18

[Jungshik Shin]

(In reply to comment #17)
> Please note that two of the recent dupes were for non en-US (French and Czech)
> installations on Windows 2000/XP.

On Windows 2k/XP, that should work fine. It doesn't work there (in cases of two
dupes) because they didn't turn on 'complex script' support in Control Panel |
Regional&Lang. setting. MS IE just works even without it (because MS IE directly
uses Uniscribe APIs), but Firefox does need that to be turned on. (see bug 218887)

> Changing OS to "All".

Well, this bug on its own is all but useless. It's just a dupe of several
complex script rendering bugs on different platforms. 

Comment 19

[Johan Laenen]

Mozilla 1.7.8, in fact 
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.8) Gecko/20061113 Debian/1.7.8-1sarge8 displays the diacritical marks seperate, see https://bugzilla.mozilla.org/attachment.cgi?id=132874, while firefox 1.5.0.7 (Mozilla/5.0, X11; U; Linux i686; en-US; rv:1.8.0.7, Gecko/20060830) does it correctly.

Comment 20

[Khaled Hosny]

The text is rendered correctly in both firefox-2.0.0.6 with pango enabled under linux, and firefox-3.0a8pre.en-US with default settings under linux too.

Comment 21

[Simon Montagu :smontagu]

WORKSFORME on all platforms (except for the incorrect placement of the combining diacritical marks on Mac, which is bug 386573)

Comment 23

[Karunia]

i use firefox 2.0.0.7 under winxp & under win9x, the diacritical marks is still separated. but when i use windows arabic enabled, it render fine. i wait since firefox 1 until the 2.0.0.7 version, it still like that. then i try to find other ways to rendering arabic text. you can visit url: http://www.matamaya.com/encoder.htm i try to manipulate the render using javascript encoder. it works!!! but only the first line! the next lines all diacritical marks are gone! see my other bug: Bug 397325