361783 - Tracking bug for Malayalam font support in firefox.

Status: RESOLVED FIXED

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

Description

[Biju]

Traking bug for Malayalam font support in firefox.

It is long been a requested feature to support Indic font in firefox.
Now Mozilla (Firefox 3) started supporting but there are a lot of issues.

Please file separate bug report for each issue and link it here.

Comment 1

[Biju]

Attachment: Chill_conversion_formula.html

(In reply to comment #5)
> The current behaviour on Windows seems to be that if we can't find a font that
> provides glyphs for *all* the codepoints in a given Uniscribe item, we don't
> display *any* glyphs for that item. Is this really what we want to be doing?

In case of malayalam even if you display *other* glyphs supported in the font, still issue remains for those who view with Karthika font, as it will be difficult to read malayalam with out chill-aksaram, when the page is written with \u0D7A to \u0D7B. 

I dont know status of \u0D7A to \u0D7B.
Some time unicode supported it.
Then they found another alternative or something.


So as an exception in case of malayalam chill-aksarams, 
if a font wont support chill-aksaram please convert it 
to alternate form using following formula for display.


ൺ (u+0D7A) -> ണ്‍  (u+0D23 + u+0D4D + u+200D)
ൻ (u+0D7B) -> ന്‍  (u+0D25 + u+0D4D + u+200D)
ർ (u+0D7C) -> ര്‍  (u+0D30 + u+0D4D + u+200D)
ൽ (u+0D7D) -> ല്‍  (u+0D32 + u+0D4D + u+200D)
ൾ (u+0D7E) -> ള്‍  (u+0D33 + u+0D4D + u+200D)
ൿ (u+0D7F) -> ക‍് (u+0D23 + u+0D4D + u+200D)
__ (u+0D7?) -> യ്‍  (u+0D2F + u+0D4D + u+200D)

see Chill_conversion_formula.html with Karthika font, to find how it works

Comment 2

[Biju]

Ignore Comment #1, it should be on bug 362527

Some link for quick for ref

Language Ref:-
Kerala Panineeyam, A. R. Rajaraja Varma, Bible for Malayalam
http://www.malayalamresourcecentre.org/Mrc/literature/keralapaanineeyam/panineeyam.html
Need MLW-TTKarthika non unicode


Fonts:-
http://prdownloads.sourceforge.net/varamozhi/AnjaliOldLipi-0.730.ttf?use_mirror=kent
http://www.supersoftweb.com/Unicode.htm


Unicode Ref:-
http://unicode.org/alloc/Pipeline.html
http://std.dkuug.dk/jtc1/sc2/wg2/docs/N3126.pdf

http://unicode.org/charts/PDF/U0D00.pdf
http://google.com/search?q=cache:unicode.org/charts/PDF/U0D00.pdf

http://unicode.org/~emuller/iwg/p28/05085-pri66-fdbk-cibu.pdf
http://google.com/search?q=cache:unicode.org/~emuller/iwg/p28/05085-pri66-fdbk-cibu.pdf
http://varamozhi.sourceforge.net/chillu/issue66.htm

http://unicode.org/consortium/utc-minutes/UTC-103-200505.html
http://unicode.org/consortium/utc-minutes/UTC-104-200508.html
http://unicode.org/consortium/utc-minutes/UTC-105-200511.html
http://unicode.org/consortium/utc-minutes/UTC-101-200411.html

http://unicode.org/review/resolved-pri.html


http://unicode.org/review/resolved-pri.html#pri94
Representation of Malayalam /au/ Vowel in Traditional and Reformed Orthography
http://unicode.org/review/pr-93.html

http://unicode.org/review/resolved-pri.html#pri71
Questions on Malayalam Digits
http://unicode.org/review/pr-71.html

http://unicode.org/review/resolved-pri.html#pri66
Encoding of Chillu Forms in Malayalam
http://unicode.org/review/pr-66.html

http://unicode.org/review/resolved-pri.html#pri37
Clarification of the Use of Zero Width Joiner in Indic Scripts
http://unicode.org/review/pr-37.pdf
http://google.com/search?q=cache:http://unicode.org/review/pr-37.pdf


http://unicode.org/~emuller/iwg/p28/05210-malayalam.pdf
http://google.com/search?q=cache:http://unicode.org/~emuller/iwg/p28/05210-malayalam.pdf

http://unicode.org/~emuller/iwg/p28/index.html

DEVANAGARI EYELASH RA
http://unicode.org/~emuller/iwg/p8/utcdoc.html

http://unicode.org/~emuller/iwg/p28/05111-public-review-subset.html

http://www.fcsh.unl.pt/philologia/N3059.pdf (page 9)
http://google.com/search?q=cache:http://www.fcsh.unl.pt/philologia/N3059.pdf 
http://varamozhi.blogspot.com/2005/07/unicode-praslesham-malayalam-avagraha.html

U+0D44 MALAYALAM VOWEL SIGN VOCALIC RR
U+0D62 MALAYALAM VOWEL SIGN VOCALIC L
U+0D3D MALAYALAM PRASLESHAM (avagraha <-100000th character)
U+0D79 MALAYALAM ORDINAL INDICATOR (or DATE MARK)

http://varamozhi.blogspot.com/
http://varamozhi.blogspot.com/2005/07/unicode-suggestions-proposals.html
http://varamozhi.blogspot.com/2005/07/unicode-malayalam-eyelash-repha.html
http://varamozhi.blogspot.com/2005/03/why-there-is-subscript-symbol.html
http://varamozhi.blogspot.com/2005/07/unicode-issues-with-visible-virama.html
http://varamozhi.blogspot.com/2005/07/unicode-concerns-unique-to-ta.html
http://www.blogger.com/profile/1246232

http://lists.sarovar.org/pipermail/plus-discuss/2006-October/000491.html

Comment 3

[Biju]

Rachana Font (GNU)
http://plus.sarovar.org/contents/fonts/
http://www.rachanamalayalam.org/

Comment 4

[Praveen A]

Now Firefox uses pango for rendering indic scripts and I think that is the right place to discuss these issues. 

Comment 5

[Praveen A]

Add this to dependencies

https://bugzilla.mozilla.org/show_bug.cgi?id=202352

Comment 6

[Biju]

Closing this as all expect bug 408437 have been closed