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notofonts / tamil

Noto Tamil
SIL Open Font License 1.1
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Tamil: "isolated" form of U+0BC2 is different from the Unicode code charts #1

Closed emuller-amazon closed 1 year ago

emuller-amazon commented 8 years ago

The "isolated" form of U+0BC2 (e.g. when applied to a U+25CC i.e. the glyph cmaped from U+0BC2) is different from what is shown in the Unicode code charts.

I do understand that Tamils learn they script as a syllabary, and therefore that the "isolated" form of vowel signs is rarely seen in practice.

jungshik commented 8 years ago

@JelleBosmaMT

JelleBosmaMT commented 8 years ago

I don't know why Unicode changed the depiction in the chart. There are various shapes that the U and UU vowel signs take when combining with a consonant in a ligature. Noto Sans Tamil uses the form that the U and UU vowel signs take for those consonants that do not form a ligature. As U+25CC does not form a ligature either, it seems quite reasonable to use this stand-alone form as the stand-alone form. Why would you use a part of a ligature as stand alone form when there is a stand alone form that can be used as stand alone form?

nizarsq commented 4 years ago

U+0BC2 still different from what is shown in the Unicode code charts. https://unicode.org/charts/PDF/U0B80.pdf @marekjez86 any thoughts on this?

Current rendering:

Screen Shot 2020-06-23 at 11 04 42 PM

Unicode rendering:

Screen Shot 2020-06-23 at 11 07 42 PM
simoncozens commented 1 year ago

I'm going to say that while this is different from the Unicode code charts, as Jelle argues, that's not necessarily wrong. Fonts aren't code charts. And it's internally consistent, so I don't see a problem here.

jamadagni commented 1 year ago

With the basic Tamil 18 consonants the VS-U/VS-UU will get ligated so the internal glyphs assigned to the respective code points will never get displayed. With additional consonants ஜ ஶ ஷ ஸ ஹ க்ஷ mostly used for words of non-Tamil-language origin, the internal glyphs do get display as these do not ligate in current orthography.

The glyphs show in the chart show one contextual form of the VS-U/VS-UU used as part of ligatures with some of the basic Tamil consonants ங ப ய வ as in ஙு ஙூ பு பூ யு யூ வு வூ. So it is just about perception.

The font may not be able to provide the contextual forms of the vowel signs in isolation (one can't expect separate characters for all the contextual forms anyhow) but it is able to display valid normal Tamil text correctly.