Jihvamuliya and upadhmaniya do not stack in Devanagari

[dscorbett]

Font

NotoSansDevanagari-Regular.ttf
NotoSerifDevanagari-Regular.ttf

Where the font came from, and when

Site: https://noto-website-2.storage.googleapis.com/pkgs/NotoSansDevanagari-unhinted.zip
Site: https://noto-website-2.storage.googleapis.com/pkgs/NotoSerifDevanagari-unhinted.zip
Date: 2018-06-07

Font version

Noto Sans Devanagari: Version 2.000;GOOG;noto-source:20170915:90ef993387c0
Noto Serif Devanagari: Version 1.01 uh

Issue

As of Unicode 11.0, U+1CF5 VEDIC SIGN JIHVAMULIYA and U+1CF6 VEDIC SIGN UPADHMANIYA have Indic_Syllabic_Category=Consonant_With_Stacker, so the following consonant should be subjoined. Cf. notofonts/brahmi#7.

Character data

ᳵकᳵखᳶपᳶफ
U+1CF5 VEDIC SIGN JIHVAMULIYA
U+0915 DEVANAGARI LETTER KA
U+1CF5 VEDIC SIGN JIHVAMULIYA
U+0916 DEVANAGARI LETTER KHA
U+1CF6 VEDIC SIGN UPADHMANIYA
U+092A DEVANAGARI LETTER PA
U+1CF6 VEDIC SIGN UPADHMANIYA
U+092B DEVANAGARI LETTER PHA

Screenshot

[sridatta1]

The background documents are L2/17-319 and L2/17-095.
These glyphs are mainly and widely used in Bengali script. These forms are also occasionally seen in few Devanagari books published in Bengal ( See the last page of L2/17-319 where the non-stacked forms are used)
In manuscripts and inscriptions of native Devanagari regions like Gujarat/Rajasthan, Maharashtra, Madhya Pradesh, Uttar Pradesh the forms in L2/17-095 are used which are not yet encoded and which also can have stacked conjuncts.
However the stacked forms need to supported in Bengali fonts, may not be needed in Devanagari.

The glyph needs to changed for Upadhmaniya https://www.unicode.org/versions/Unicode11.0.0/erratafixed.html

[marekjez86]

fixed in https://github.com/googlefonts/noto-fonts/tree/master/phaseIII_only/unhinted/ttf/NotoSerifDevanagari

[marekjez86]

reopening for Sans (my bad)

[nizarsq]

Current rendering in NotoSansDevanagari-Regular.ttf and NotoSerifDevanagari-Regular.ttf

[simoncozens]

Because this font has been designed with precomposed glyphs, rather than composable marks, it looks like supporting the stacked conjuncts will require a lot of extra drawing. One question I have is whether the four cases mentioned in L2/17-095:

• Jihvamuliya ೱ + Ka क
• Jihvamuliya ೱ + Kha ख
• Upadhmaniya ᳶ +Pa प
• Upadhmaniya ᳶ +Pha फ

are exclusive, or if stacking would need to apply to other bases.

[virtualvinodh]

@simoncozens AFAIK Grammatically speaking, they cannot appear before other consonants.

V