notofonts / ahom Goto Github PK

Font

NotoSerifAhom-Regular.ttf

Where the font came from, and when

Site: https://github.com/googlefonts/noto-fonts/blob/4bff97c612daf65d4409c9ebc26dfbd6a3d83a7e/phaseIII_only/unhinted/ttf/NotoSerifAhom/NotoSerifAhom-Regular.ttf
Date: 2019-04-18

Font version

Version 2.002

Issue

U+11722 AHOM VOWEL SIGN I and U+11724 AHOM VOWEL SIGN U generally ligate, except after the consonants nga, na, da, and nya, but in Noto Serif Ahom, when a glyph comes between one of the other consonants and those two vowels, the vowels do not ligate.

I have given three example syllables. In the second, the medial -l and the -u overlap cleanly, so it might be intentional; but the Unicode proposal doesn’t say anything about that, so it might not. The third uses a vowel sequence that I don’t know is attested.

Character data

𑜁𑜟𑜢𑜤
U+11701 AHOM LETTER KHA
U+1171F AHOM CONSONANT SIGN MEDIAL LIGATING RA
U+11722 AHOM VOWEL SIGN I
U+11724 AHOM VOWEL SIGN U
𑜀𑜝𑜢𑜤
U+11700 AHOM LETTER KA
U+1171D AHOM CONSONANT SIGN MEDIAL LA
U+11722 AHOM VOWEL SIGN I
U+11724 AHOM VOWEL SIGN U
𑜀𑜦𑜢𑜤
U+11700 AHOM LETTER KA
U+11726 AHOM VOWEL SIGN E
U+11722 AHOM VOWEL SIGN I
U+11724 AHOM VOWEL SIGN U

Screenshot

Font

NotoSerifAhom-Regular.ttf

Where the font came from, and when

Site: https://github.com/googlei18n/noto-fonts/blob/d7af81e614086435102cca95961b141b3530a027/hinted/NotoSerifAhom-Regular.ttf
Date: 2018-10-24

Font version

Version 2.001;GOOG;noto-source:20181019:f8f3770

Issue

According to L2/12-0309R, U+1171F AHOM CONSONANT SIGN MEDIAL LIGATING RA represents the medial ra in two archaic ligatures of khra and phra. However, the font only forms those ligatures when 'dlig' is enabled. The ligatures should always be formed: that is why U+1171F is called “LIGATING”.

Character data

𑜁𑜟𑜇𑜟
U+11701 AHOM LETTER KHA
U+1171F AHOM CONSONANT SIGN MEDIAL LIGATING RA
U+11707 AHOM LETTER PHA
U+1171F AHOM CONSONANT SIGN MEDIAL LIGATING RA

Screenshot

Font

NotoSerifAhom-Regular.ttf

Where the font came from, and when

Site: https://github.com/googlei18n/noto-fonts/blob/d7af81e614086435102cca95961b141b3530a027/hinted/NotoSerifAhom-Regular.ttf
Date: 2018-10-24

Font version

Version 2.001;GOOG;noto-source:20181019:f8f3770

Issue

Repeated Ahom viramas overlap each other. See L2/12-309R figure 3.

Character data

𑜃𑜫𑜫
U+11703 AHOM LETTER NA
U+1172B AHOM SIGN KILLER
U+1172B AHOM SIGN KILLER

Screenshot

Font

NotoSerifAhom-Regular.ttf

Where the font came from, and when

Site: https://github.com/googlefonts/noto-fonts/blob/4bff97c612daf65d4409c9ebc26dfbd6a3d83a7e/phaseIII_only/unhinted/ttf/NotoSerifAhom/NotoSerifAhom-Regular.ttf
Date: 2019-04-18

Font version

Version 2.002

Issue

'dist' kerns Ahom na and -aa apart, except when there is a mark glyph between them like -l. The mark does not modify or appear between the other two glyphs, so I’d expect it to have no effect on their spacing.

Character data

𑜃𑜡
U+11703 AHOM LETTER NA
U+11721 AHOM VOWEL SIGN AA
𑜃𑜝𑜡
U+11703 AHOM LETTER NA
U+1171D AHOM CONSONANT SIGN MEDIAL LA
U+11721 AHOM VOWEL SIGN AA

Screenshot

Font

NotoSerifAhom-Regular.ttf

Where the font came from, and when

Site: https://github.com/googlefonts/noto-fonts/blob/4bff97c612daf65d4409c9ebc26dfbd6a3d83a7e/phaseIII_only/unhinted/ttf/NotoSerifAhom/NotoSerifAhom-Regular.ttf
Date: 2019-04-18

Font version

Version 2.002

Issue

After the glyphs medialLigaRa_ahom, khra_ahom, phra_ahom, and t_ja_ahom, vowel signs that should be spacing are not spacing.

Character data

𑜀𑜟𑜢𑜂
U+11700 AHOM LETTER KA
U+1171F AHOM CONSONANT SIGN MEDIAL LIGATING RA
U+11722 AHOM VOWEL SIGN I
U+11702 AHOM LETTER NGA
𑜁𑜟𑜢𑜂
U+11701 AHOM LETTER KHA
U+1171F AHOM CONSONANT SIGN MEDIAL LIGATING RA
U+11722 AHOM VOWEL SIGN I
U+11702 AHOM LETTER NGA
𑜇𑜟𑜢𑜂
U+11707 AHOM LETTER PHA
U+1171F AHOM CONSONANT SIGN MEDIAL LIGATING RA
U+11722 AHOM VOWEL SIGN I
U+11702 AHOM LETTER NGA
𑜅𑜊𑜢𑜂
U+11705 AHOM LETTER ALTERNATE TA
U+1170A AHOM LETTER JA
U+11722 AHOM VOWEL SIGN I
U+11702 AHOM LETTER NGA

Screenshot

Font

NotoSerifAhom-Regular.otf

Where the font came from, and when

Site: https://github.com/notofonts/ahom/releases/tag/NotoSerifAhom-v2.005
Date: 2022-06-22

Font version

Version 2.005

Issue

⟨𑜅𑜞𑜊⟩ is kerned badly: it overlaps the next cluster.

Character data

𑜅𑜞𑜊𑜕
U+11705 AHOM LETTER ALTERNATE TA
U+1171E AHOM CONSONANT SIGN MEDIAL RA
U+1170A AHOM LETTER JA
U+11715 AHOM LETTER GA

Screenshot

Font

NotoSerifAhom-Regular.ttf

Where the font came from, and when

Site: https://github.com/googlefonts/noto-fonts/blob/37b29f06fd0e65633ab7201555c28710888b45a1/hinted/ttf/NotoSerifAhom/NotoSerifAhom-Regular.ttf
Date: 2020-12-23

Font version

Version 2.003

Issue

U+1171E AHOM CONSONANT SIGN MEDIAL RA blocks the ligature between U+11705 AHOM LETTER ALTERNATE TA and U+1170A AHOM LETTER JA. Cf. U+11726 AHOM VOWEL SIGN E, another reordering mark, which does not block the ligature.

Character data

𑜅𑜞𑜊
U+11705 AHOM LETTER ALTERNATE TA
U+1171E AHOM CONSONANT SIGN MEDIAL RA
U+1170A AHOM LETTER JA
𑜅𑜦𑜊
U+11705 AHOM LETTER ALTERNATE TA
U+11726 AHOM VOWEL SIGN E
U+1170A AHOM LETTER JA

Screenshot

Defect Report

Font

NotoSerifAhom-Regular.ttf

Where the font came from, and when

Site: https://notofonts.github.io/fonts/NotoSerifAhom/full/ttf/NotoSerifAhom-Regular.ttf
Date: 2022-07-04

Font Version

v2.005

Issue

As of Unicode version 14.0, 7 new characters were added to the Ahom Unicode block, these characters are not covered in Noto Serif Ahom per 04 July 2022.

Character data

11740 𑝀 AHOM LETTER CA
11741 𑝁 AHOM LETTER TTA
11742 𑝂 AHOM LETTER TTHA
11743 𑝃 AHOM LETTER DDA
11744 𑝄 AHOM LETTER DDHA
11745 𑝅 AHOM LETTER NNA
11746 𑝆 AHOM LETTER LLA

Reference

http://unicode.org/charts/PDF/U11700.pdf

Screenshot

Font

NotoSerifAhom-Regular.otf

Where the font came from, and when

Site: https://github.com/notofonts/ahom/releases/tag/NotoSerifAhom-v2.006
Date: 2023-03-24

Font version

Version 2.006

Issue

Issue #12 still exists for syllables where the base letter and the ⟨-i, -u⟩ sequence are separated by U+1171E AHOM CONSONANT SIGN MEDIAL RA or by multiple code points.

Rather than extending the fix implemented for that issue, I recommend a two-part solution. First, do the ligation after reordering instead of in 'ccmp', so that you don’t have to handle U+11726 AHOM VOWEL SIGN E explicitly. Second, use a mark set in the ligature lookup, so that irrelevant marks like U+1171D are skipped.

Character data

𑜀𑜞𑜢𑜤
U+11700 AHOM LETTER KA
U+1171E AHOM CONSONANT SIGN MEDIAL RA
U+11722 AHOM VOWEL SIGN I
U+11724 AHOM VOWEL SIGN U

𑜀
U+11700 AHOM LETTER KA
U+1171D AHOM CONSONANT SIGN MEDIAL LA
U+11726 AHOM VOWEL SIGN E
U+11722 AHOM VOWEL SIGN I
U+11724 AHOM VOWEL SIGN U

Screenshot

Font

NotoSerifAhom-Regular.ttf

Where the font came from, and when

Site: https://github.com/googlefonts/noto-fonts/blob/4bff97c612daf65d4409c9ebc26dfbd6a3d83a7e/phaseIII_only/unhinted/ttf/NotoSerifAhom/NotoSerifAhom-Regular.ttf
Date: 2019-04-18

Font version

Version 2.002

Issue

The vowel sign e is kerned with the alternative ta but not with ligature of alternative ta and ja.

Character data

𑜅𑜦
U+11705 AHOM LETTER ALTERNATE TA
U+11726 AHOM VOWEL SIGN E
𑜅𑜦𑜊
U+11705 AHOM LETTER ALTERNATE TA
U+11726 AHOM VOWEL SIGN E
U+1170A AHOM LETTER JA

Screenshot

Font

NotoSerifAhom-Regular.ttf

Where the font came from, and when

Site: https://github.com/googlei18n/noto-fonts/blob/d7af81e614086435102cca95961b141b3530a027/hinted/NotoSerifAhom-Regular.ttf
Date: 2018-10-24

Font version

Version 2.001;GOOG;noto-source:20181019:f8f3770

Issue

U+11734 AHOM DIGIT FOUR should look like 𑜏𑜣 sī but looks like 𑜏 sa.

Character data

𑜴
U+11734 AHOM DIGIT FOUR

Screenshot

I have checked the Noto Serif Ahom font in several different applications (Microsoft Word, Libre Office, Facebook - using Chrome, Facebook - using Firefox) and found some implementation issues that differ from one application to another.

One issue, however, is common to all and is therefore assumed to be a 'bug' with the Noto Serif Ahom font that needs to be fixed.

It is described as follows:

The combination of AHOM VOWEL SIGN I (U+11722) and AHOM VOWEL SIGN U (U+11724) when following certain consonants NA NYA DA NGA, does not appear with the middle of the AHOM VOWEL SIGN I vowel directly above the vertical portion of the AHOM VOWEL SIGN U

The combination of AHOM VOWEL SIGN I and AHOM VOWEL SIGN U forms a ligature except after the four named consonants, and this is happening correctly in 5 of the 6 applications tested (not In Microsoft word). However the letters AHOM VOWEL SIGN I and AHOM VOWEL SIGN U need to be kerned when they are in combination with the four consonants NA, NYA, DA and NGA.

Please let me know if more information is needed.

Testing the Ahom font in different applications - 20221107.pdf

Font

NotoSerifAhom-Regular.ttf

Where the font came from, and when

Site: https://github.com/googlei18n/noto-fonts/blob/d7af81e614086435102cca95961b141b3530a027/hinted/NotoSerifAhom-Regular.ttf
Date: 2018-10-24

Font version

Version 2.001;GOOG;noto-source:20181019:f8f3770

Issue

According to L2/12-0309R, the glyph called u11714.alt in Noto Serif Ahom “is a font variant of AHOM LETTER GA (U+11714)”. However, U+11714 is AHOM LETTER DHA: the proposal got the code point wrong, and the glyph should be a stylistic alternative of u11715. I know this is a form of ga and not dha because the earlier version of the proposal calls it GA and writes the code point consistently.

Character data

𑜔𑜕
U+11714 AHOM LETTER DHA
U+11715 AHOM LETTER GA

Screenshot

With 'salt':

Font

NotoSerifAhom-Regular.ttf

Where the font came from, and when

Site: https://github.com/googlei18n/noto-fonts/blob/d7af81e614086435102cca95961b141b3530a027/hinted/NotoSerifAhom-Regular.ttf
Date: 2018-10-24

Font version

Version 2.001;GOOG;noto-source:20181019:f8f3770

Issue

Ahom na and -i are kerned apart, except when the syllable also includes -u. The -u does not modify or appear between the other two glyphs, so I’d expect it to have no effect on their spacing.

Character data

𑜃𑜢
U+11703 AHOM LETTER NA
U+11722 AHOM VOWEL SIGN I
𑜃𑜢𑜤
U+11703 AHOM LETTER NA
U+11722 AHOM VOWEL SIGN I
U+11724 AHOM VOWEL SIGN U

Screenshot