Noto Kannada Sans issue with Ra (+nukta), ZWJ, consonant conjugate and halant

[MayuraVerma]

Font

'NotoSansKannada-Regular.ttf'.

Font Version

1.03uh

OS name and version

Mac OS High Sierra GM

Application name and version

Chrome Version 61.0.3163.100 (Official Build) (64-bit)

Issue

ರ‍್ನ್ (\u0cb0\u200d\u0ccd\u0ca8\u0ccd ) ರ‍್ನ್ಕ್ (\u0cb0\u200d\u0ccd\u0ca8\u0ccd\u0c95\u0ccd ) ರ಼‍್ನ್ (\u0cb0\u0cbc\u200d\u0ccd\u0ca8\u0ccd) ರ಼‍್ನ್ಕ್ (\u0cb0\u0cbc\u200d\u0ccd\u0ca8\u0ccd\u0c95\u0ccd)

Output in Chrome

Halant at the end is not joined with the base "ರ".

1. Test "ರ‍್ನ್ ರ‍್ನ್ಕ್ ರ಼‍್ನ್ ರ಼‍್ನ್ಕ್" with Noto Sans Kannada in Chrome
2. Halant(u0ccd) at the disjoined with the base ರ (u0cb0)
3. Halant joined with the base ರ
4. This could be due to the presence of the zero-width-joiner after the base ರ (u0cb0), which is required with ರ (u0cb0) to obtain the consonant conjugate

[MayuraVerma]

@JelleBosmaMT Please review this.

[JelleBosmaMT]

Thank you for pointing this out. I added a fix to my source file, so that U+200D (ZWJ) doesn't leave a displaced virama in the new version of the fonts. At the time Noto Sans Kannada was designed Mac OS wasn't supporting Kannada OpenType, so the rendering was tested with Windows. Windows re-orders the vowel signs that combine with the base consonants right after the base, before the ZWJ. Therefore there was no problem with life conjuncts with ZWJ, and evidently I didn't test the dead conjunct case. I now discovered that Mac OS re-orders the vowel signs after the ZWJ, and the vowels were displaced too. So two fixes in one go ;-)

[MayuraVerma]

@JelleBosmaMT Great. I thought this was issue with Apple Coretext for vowel displacement, because it was working fine in chrome.

Please check this blog http://kannadafont.blogspot.com/2017/10/case-4-b-ra-with-consonant-conjugate.html with the new version.

Is it possible I can get a copy of the new version?

[MayuraVerma]

Hello @JelleBosmaMT

Could try the new version, please.

[marekjez86]

@MayuraVerma ( cc @JelleBosmaMT ) : we, Google, are officially releasing the fonts once we get the source files. Hence, I would prefer not to do a one-of by Jelle. However, if he sends me sources I have no problem building a single weight TTF or OTF file and send you for testing.

[MayuraVerma]

Thank you.

[marekjez86]

@MayuraVerma : I have attached here a font file courtesy of JelleBosmaMT which you can use for testing. Please post any feedback here. Thank you.

NotoSansKannada-Regular_OTL-not-for-further-distribution.otf.zip

[MayuraVerma]

This version is displaying correctly in Chrome. Although libreoffice uses harfbuzz, we issue with nukta. Please check. In the below picture, top line is chrome, below line is libreoffice.

[JelleBosmaMT]

If there is a dotted cycle, it is the software that decides that there is an invalid combination of Unicode characters. This is not a font issue.

[kalapi]

I fixed this in Noto Serif Kannada as well:

[MayuraVerma]

FYI: I was using LibreOffice 5.2.2 which was using Apple CoreText. After upgrading to LibreOffice 5.4.2 which uses harfbuzz, text is rendering correctly.

Screenshot from LibreOffice

[MayuraVerma]

@kalapi ರ‍್ (\u0cb0\u200d\u0ccd) ರ‍್ಯ್ (\u0cb0\u200d\u0ccd\u0caf\u0ccd)

I check these combinations with the latest build 2.001. It is still collapsed. Please review.

[kalapi]

Hi @MayuraVerma

Can you tell me what environment you're testing on? It works for me on all the latest browsers on OSX 10.11.6 (El Capitan).

Just as a precaution, if you've installed a previous version, there might be a caching issue locally.

Can you test the combinations on this testing page? Simple drag and drop the TTF file to the grey area at the top that says 'Drag fonts here!' and edit the text in the lines below. It should just work.

Let me know what you find.

[MayuraVerma]

Hello Kalapi,

I have tested in pages in Mac OS mojave, High Sierra. also, Window 10 - Word 2010 combination Windows 7 and Word 2016 combination

All same result.

Noto sans ರ‍್ ರ‍್ಯ್ ರ‍್ಯ್ನ್ Noto serif ರ‍್ ರ‍್ಯ್ ರ‍್ಯ್ನ್

[MayuraVerma]

@kalapi FYI: there are many unresolved issues for serif

ra+virama+ra -> https://github.com/googlei18n/noto-fonts/issues/1076 is still unresolved. Please take a look at it.

jihvamuliya and upadhmaniya -> https://github.com/googlei18n/noto-fonts/issues/459

ಝೊ ಝೋ was correct in earlier versions. -> https://github.com/googlei18n/noto-fonts/issues/819 now it is changed to wrong form in 2.001. earlier form new form, this is wrong

multiple design issues in serif -> https://github.com/googlei18n/noto-fonts/issues/1193

Noto Serif will be favorite for native Kannada people (because of the style) to write from simple letter to complex documents. Please resolve all the issues before the final release

[chandrab699]

two more issues

nukta ->https://github.com/googlei18n/noto-fonts/issues/1293

below form consonants and vowels-> https://github.com/googlei18n/noto-fonts/issues/1294

[chandrab699]

Subs/Subs Sp. Tall Subs Sp. comma-> this is not desirable. Comma must outside the sub. or composite letter same thing here

ru overlapping

comma overlapping

visually ಟ looks like not of the same family as the rest of the character. Perhaps stroke width can be reduced and/or stroke length be reduced to match the rest of the consonants

[chandrab699]

ರ‍್ ರ‍್ಯ್ ರ‍್ಯ್ನ್ Chrome vs Internet explorer in Windows 7. Chrome is fine, expect double subscript overlaps font fails in IE. same result is found in Safari in Mac.

If you are testing in Mac OS, must use Safari to test against Core-Text. Chrome in mac OS will use harfbuzz shaping engine.

[MayuraVerma]

@kalapi @marekjez86 please review this