[Fedora-i18n-bugs] [Bug 497090] New: [bn][bn-IN][as] Invalid addition of Yaphala conjuncts are being rendered

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Red Hat Bugzilla

22 Apr 2009 22 Apr '09

11:54 a.m.

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Summary: [bn][bn-IN][as] Invalid addition of Yaphala conjuncts are being rendered

https://bugzilla.redhat.com/show_bug.cgi?id=497090

Summary: [bn][bn-IN][as] Invalid addition of Yaphala conjuncts are being rendered Product: Fedora Version: rawhide Platform: All OS/Version: Linux Status: NEW Keywords: i18n Severity: medium Priority: low Component: fonts-indic AssignedTo: rbhalera@redhat.com ReportedBy: runab@redhat.com QAContact: extras-qa@fedoraproject.org CC: rbhalera@redhat.com, fedora-fonts-bugs-list@redhat.com, fedora-i18n-bugs@redhat.com Estimated Hours: 0.0 Classification: Fedora Target Release: ---

Description of problem:

In case of conjuncts with Yaphala (U09CD+U09AF), multiple Yaphala signs can be typed consecutively giving rise to invalid conjunct combinations.

e.g ক্য্য্য্য (ক+্+য+্+য+্+য+্+য)

This error could be replicated in gedit, kwrite and Openoffice.org Writer

Version-Release number of selected component (if applicable):

fonts-indic: 2.3.8-1.fc11 gedit : 2.26.1-1.fc11 openoffice.org: 3.1.0-9.2.fc11 kdebase : 4.2.2-2.fc11

How reproducible:

Steps to Reproduce: 1. Open gedit 2. Type in the following unicode values (for the above example) :

U0995+U09CD+U09AF+U09CD+U09AF+U09CD+U09AF+U09CD+U09AF

Actual results:

The last 3 U09CD+U09AF pairs are allowed as part of the conjunct

Expected results:

The U09CD+U09AF pair should not be allowed to be rendered after another U09CD+U09AF. i.e. only one U09CD+U09AF pair can be used when combining with another consonant to form a conjunct.

Additional info:

Please do note that: U09AF+U09CD+U09AF is a valid conjunct combination, where two U09AF characters combine to form a conjunct (য্য)

Screenshots:

gedit: http://runab.fedorapeople.org/assorted-bugs/gedit-ya.png kwrite: http://runab.fedorapeople.org/assorted-bugs/kwrite-ya.png oowrite: http://runab.fedorapeople.org/assorted-bugs/oowrite-ya.png

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Red Hat Bugzilla

2 Jun 2 Jun

6:27 a.m.

New subject: [Fedora-i18n-bugs] [Bug 497090] [bn][bn-IN][as] Invalid addition of Yaphala conjuncts are being rendered

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https://bugzilla.redhat.com/show_bug.cgi?id=497090

Rahul Bhalerao rbhalera@redhat.com changed:

What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |MODIFIED

--- Comment #1 from Rahul Bhalerao rbhalera@redhat.com 2009-06-02 01:27:57 EDT --- IMO, this is not wrong semantically, since a syllable can be composed of any number of Consonant+(Halant+Consonant)n sequences. Although this can be a case of not usable syllables or the syllables that are not used in the given language, it may not qualify as a critical issue to be tweaked in the layout engine.

@Amit, can you please mention if this is a bug for Assamese language as well or just an unused syllable?

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Red Hat Bugzilla

29 Jun 29 Jun

7:18 a.m.

New subject: [Fedora-i18n-bugs] [Bug 497090] [bn][bn-IN][as] Invalid addition of Yaphala conjuncts are being rendered

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https://bugzilla.redhat.com/show_bug.cgi?id=497090

Jens Petersen petersen@redhat.com changed:

What |Removed |Added ---------------------------------------------------------------------------- AssignedTo|smohan@redhat.com |b.rahul.pm@gmail.com

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Red Hat Bugzilla

7:59 a.m.

New subject: [Fedora-i18n-bugs] [Bug 497090] [bn][bn-IN][as] Invalid addition of Yaphala conjuncts are being rendered

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https://bugzilla.redhat.com/show_bug.cgi?id=497090

Jens Petersen petersen@redhat.com changed:

What |Removed |Added ---------------------------------------------------------------------------- AssignedTo|b.rahul.pm@gmail.com |psatpute@redhat.com

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Red Hat Bugzilla

8:02 a.m.

New subject: [Fedora-i18n-bugs] [Bug 497090] [bn][bn-IN][as] Invalid addition of Yaphala conjuncts are being rendered

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https://bugzilla.redhat.com/show_bug.cgi?id=497090

Jens Petersen petersen@redhat.com changed:

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Red Hat Bugzilla

3 Jul 3 Jul

11:05 a.m.

New subject: [Fedora-i18n-bugs] [Bug 497090] [bn][bn-IN][as] Invalid addition of Yaphala conjuncts are being rendered

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https://bugzilla.redhat.com/show_bug.cgi?id=497090

Pravin Satpute psatpute@redhat.com changed:

--- Comment #4 from Pravin Satpute psatpute@redhat.com 2009-07-03 06:05:07 EDT --- me too agree with Rahuls comment can we close this bug?

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Red Hat Bugzilla

11:05 a.m.

New subject: [Fedora-i18n-bugs] [Bug 497090] [bn][bn-IN][as] Invalid addition of Yaphala conjuncts are being rendered

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https://bugzilla.redhat.com/show_bug.cgi?id=497090

Pravin Satpute psatpute@redhat.com changed:

What |Removed |Added ---------------------------------------------------------------------------- AssignedTo|b.rahul.pm@gmail.com |psatpute@redhat.com

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Red Hat Bugzilla

14 Jul 14 Jul

9:52 a.m.

New subject: [Fedora-i18n-bugs] [Bug 497090] [bn][bn-IN][as] Invalid addition of Yaphala conjuncts are being rendered

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https://bugzilla.redhat.com/show_bug.cgi?id=497090

Pravin Satpute psatpute@redhat.com changed:

What |Removed |Added ---------------------------------------------------------------------------- Flag|needinfo? |

--- Comment #5 from Pravin Satpute psatpute@redhat.com 2009-07-14 04:52:28 EDT --- after discussion with runa on this bug found that this issue can be solve in font itself by just adding some contextual GSUB rules,

context will be

before executing rule for halant+ya check does it preceded by halant+ya

if yes do not execute rule else execute it

but bit doubtful about do Open Type provides such a tag for bengali script like we have for Arabic contextual

http://www.microsoft.com/typography/otfntdev/bengalot/features.aspx

i will back to this

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Red Hat Bugzilla

28 Jan 28 Jan

10:02 a.m.

New subject: [Fedora-i18n-bugs] [Bug 497090] [bn][bn-IN][as] Invalid addition of Yaphala conjuncts are being rendered

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https://bugzilla.redhat.com/show_bug.cgi?id=497090

Pravin Satpute psatpute@redhat.com changed:

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Red Hat Bugzilla

8 Mar 8 Mar

5:34 a.m.

New subject: [Fedora-i18n-bugs] [Bug 497090] [bn][bn-IN][as] Invalid addition of Yaphala conjuncts are being rendered

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https://bugzilla.redhat.com/show_bug.cgi?id=497090

Naveen Kumar nkumar@redhat.com changed:

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Red Hat Bugzilla

9 Mar 9 Mar

9:23 a.m.

New subject: [Fedora-i18n-bugs] [Bug 497090] [bn][bn-IN][as] Invalid addition of Yaphala conjuncts are being rendered

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https://bugzilla.redhat.com/show_bug.cgi?id=497090

--- Comment #6 from Naveen Kumar nkumar@redhat.com 2010-03-09 04:23:24 EST --- Submitting a patch to this bug. Please verify it:

Patch: http://nkumar.fedorapeople.org/lohit-bengali-fonts/Lohit-Bengali-Bug497090-Y...

Modified sfd: http://nkumar.fedorapeople.org/lohit-bengali-fonts/Lohit-Bengali-Bug497090-Y...

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Red Hat Bugzilla

10:24 a.m.

New subject: [Fedora-i18n-bugs] [Bug 497090] [bn][bn-IN][as] Invalid addition of Yaphala conjuncts are being rendered

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https://bugzilla.redhat.com/show_bug.cgi?id=497090

--- Comment #7 from Naveen Kumar nkumar@redhat.com 2010-03-09 05:24:04 EST --- Created an attachment (id=398759) --> (https://bugzilla.redhat.com/attachment.cgi?id=398759) Demonstrates what this patch solves in Lohit-Bengali-Bug497090-YaphalaConjuncts

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Red Hat Bugzilla

10:25 a.m.

New subject: [Fedora-i18n-bugs] [Bug 497090] [bn][bn-IN][as] Invalid addition of Yaphala conjuncts are being rendered

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https://bugzilla.redhat.com/show_bug.cgi?id=497090

--- Comment #8 from Naveen Kumar nkumar@redhat.com 2010-03-09 05:25:34 EST --- Created an attachment (id=398760) --> (https://bugzilla.redhat.com/attachment.cgi?id=398760) Patch to this Bug

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Red Hat Bugzilla

10:27 a.m.

New subject: [Fedora-i18n-bugs] [Bug 497090] [bn][bn-IN][as] Invalid addition of Yaphala conjuncts are being rendered

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https://bugzilla.redhat.com/show_bug.cgi?id=497090

--- Comment #9 from Naveen Kumar nkumar@redhat.com 2010-03-09 05:26:58 EST --- TTF file: http://nkumar.fedorapeople.org/lohit-bengali-fonts/Lohit-Bengali-Bug497090-Y...

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Red Hat Bugzilla

10 Mar 10 Mar

5:42 a.m.

New subject: [Fedora-i18n-bugs] [Bug 497090] [bn][bn-IN][as] Invalid addition of Yaphala conjuncts are being rendered

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https://bugzilla.redhat.com/show_bug.cgi?id=497090

--- Comment #10 from Runa Bhattacharjee runab@redhat.com 2010-03-10 00:42:05 EST --- Hi Naveen,

Thanks for the patch. On gedit the display is correct as per the expected result. However, for kwrite and OpenOffice.org Writer, boxes are displayed instead of a dotted circle. Images of the actual displayed characters are as follows:

kwrite: http://runab.fedorapeople.org/assorted-bugs/kwrite-497090.png oowrite: http://runab.fedorapeople.org/assorted-bugs/oowrite-497090.png

Thanks Runa

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Red Hat Bugzilla

12:58 p.m.

New subject: [Fedora-i18n-bugs] [Bug 497090] [bn][bn-IN][as] Invalid addition of Yaphala conjuncts are being rendered

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https://bugzilla.redhat.com/show_bug.cgi?id=497090

--- Comment #11 from Naveen Kumar nkumar@redhat.com 2010-03-10 07:58:25 EST --- h(In reply to comment #10)

...

Hi Naveen,

Thanks for the patch. On gedit the display is correct as per the expected result. However, for kwrite and OpenOffice.org Writer, boxes are displayed instead of a dotted circle. Images of the actual displayed characters are as follows:

kwrite: http://runab.fedorapeople.org/assorted-bugs/kwrite-497090.png oowrite: http://runab.fedorapeople.org/assorted-bugs/oowrite-497090.png

Thanks Runa

Thanks for replying. Here is the quick fix to that Kwrite and oowrite box problem. It is fixed for Pango but it looks like it is difficult to fix it for Kwrite & oowrite (icu). Also I have restored the problem for Kwrite & oowrite (icu). Now no more boxes but it is not patched for Kwrite & oowrite (icu). They don't seem to read Contextual Substitution Tables well or not at all.

Patch URL: http://nkumar.fedorapeople.org/lohit-bengali-fonts/Lohit-Bengali-Bug497090-Y...

SFD URL: http://nkumar.fedorapeople.org/lohit-bengali-fonts/Lohit-Bengali-Bug497090-Y...

TTF URL: http://nkumar.fedorapeople.org/lohit-bengali-fonts/Lohit-Bengali-Bug497090-Y...

I tested it on a Windows Machine and it looks exactly like pango output (tested it on pango-view & gedit).

Need some more time to check if it could be fixed at all for Kwrite & oowrite (icu) from font side. Otherwise need to raise a bug for QT and ICU.

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Red Hat Bugzilla

22 Jul 22 Jul

6:56 a.m.

New subject: [Fedora-i18n-bugs] [Bug 497090] [bn][bn-IN][as] Invalid addition of Yaphala conjuncts are being rendered

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https://bugzilla.redhat.com/show_bug.cgi?id=497090

Jens Petersen petersen@redhat.com changed:

What |Removed |Added ---------------------------------------------------------------------------- Status|MODIFIED |ASSIGNED

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Red Hat Bugzilla

6:57 a.m.

New subject: [Fedora-i18n-bugs] [Bug 497090] [bn][bn-IN][as] Invalid addition of Yaphala conjuncts are being rendered

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https://bugzilla.redhat.com/show_bug.cgi?id=497090

Jens Petersen petersen@redhat.com changed:

What |Removed |Added ---------------------------------------------------------------------------- AssignedTo|nkumar@redhat.com |psatpute@redhat.com

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Red Hat Bugzilla

7:11 a.m.

New subject: [Fedora-i18n-bugs] [Bug 497090] [bn][bn-IN][as] Invalid addition of Yaphala conjuncts are being rendered

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https://bugzilla.redhat.com/show_bug.cgi?id=497090

--- Comment #13 from Naveen Kumar nkumar@redhat.com 2010-07-22 02:11:18 EDT --- I had another solution to this using class based contextual rule, which could have worked even for QT/KDE applications, but then @Runa showed me that it introduces ZWNJ/ZWJ problems.

And Pragmatically, I personally believe, bugs like these are less important for they are more about invalid sequences than a valid one.

I am expressing this view only by taking into account failed attempts by us (indic developers) to push changes/patches into rendering engines. The situation is grim, but let's face it.

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Red Hat Bugzilla

7:54 a.m.

New subject: [Fedora-i18n-bugs] [Bug 497090] [bn][bn-IN][as] Invalid addition of Yaphala conjuncts are being rendered

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https://bugzilla.redhat.com/show_bug.cgi?id=497090

Pravin Satpute psatpute@redhat.com changed:

--- Comment #14 from Pravin Satpute psatpute@redhat.com 2010-07-22 02:54:28 EDT --- yes, these combination doesn't occur in really data (i.e requested in expected results)

and as tried by Naveen and Runa, resolving this introducing regression.

thanks naveen for trying this, surely it improved your knowledge of OTF Contextual GUSB:)

closing this

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