bugFree UCS Outline Fonts - Bugs: bug #51007, "'blws' subscript cons on ra...

 
 

bug #51007: "'blws' subscript cons on ra via ZWJ in Kannada" is never applied

Submitter:  David Corbett <dscorbett>
Submitted:  Thu 11 May 2017 09:29:01 PM UTC
   
 
Category:  individual character(s) Severity:  3 - Normal
Item Group:  character substitution issue Status:  Fix posted
Privacy:  Public Assigned to:  Stevan_White
Open/Closed:  Open Release:  * development
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Fri 11 Aug 2017 04:26:50 PM UTC, comment #2: 

I can't make any sense of this table either.  Best guess is that it was a leftover, maybe originally intended to avoid the below-form in the presence of something (now it's nukta, should have been ZWJ).

deleted
'blws' subscript cons on ra via ZWJ in Kannada

Near as I can tell, it now passes my tests, including below-form conjuncts and non-below-form conjuncts with ZWJ.  See attached.

(file #41482, file #41483)

Steve White <Stevan_White>
Group administrator
Fri 12 May 2017 05:09:17 PM UTC, comment #1: 

Actually, on second thought, the current behavior follows the OpenType Kannada spec (i.e. the last line of https://www.microsoft.com/typography/OpenTypeDev/kannada/images/image005.gif), so all that should be done is to delete this misleading and unused 'blws' lookup.

The proper way to get subscript consonants below ra in Kannada is via ⟨ZWJ halanta_kan⟩, which already works in FreeSerif.

David Corbett <dscorbett>
Thu 11 May 2017 09:29:01 PM UTC, original submission:  

In FreeSerif, "'blws' subscript cons on ra via ZWJ in Kannada" is meant to convert sequences like ⟨ra_kan halanta_kan ZWJ ka_kan⟩ to ⟨ra_kan kan_ka.blw⟩. However, it is never applied: that example instead becomes ⟨kan_ra.ardha halanta_kan ZWJ ka_kan⟩.

data:text/html;charset=utf-8,<div style="font: 100px FreeSerif">%E0%B2%B0%E0%B3%8D%E2%80%8D%E0%B2%95

This is because "'abvs' half forms before abv marks in Kannada" is applied first and converts ⟨ra_kan halanta_kan⟩ to ⟨kan_ra.ardha halanta_kan⟩, so the 'blws' lookup never matches. Disabling 'abvs' allows 'blws' to work.

data:text/html;charset=utf-8,<div style="font: 100px FreeSerif; font-feature-settings: 'abvs' off">%E0%B2%B0%E0%B3%8D%E2%80%8D%E0%B2%95

David Corbett <dscorbett>

 

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Attached Files
file #41482:  conjuncts.html added by Stevan_White (395KiB - text/html)

 

Depends on the following items: None found

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    Follow 4 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2017-08-11 Stevan_White Attached File- Added conjuncts.html, #41482
        Attached File- Added test-combinations.html, #41483
        StatusNone Fix posted
        Assigned toNone Stevan_White

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