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notofonts / khmer

Noto Khmer
SIL Open Font License 1.1
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Ascent and descent problems in Sans and Serif document fonts #28

Closed Kanjilearner817 closed 9 months ago

Kanjilearner817 commented 1 year ago

According to FontForge, Noto Sans Khmer and Noto Serif Khmer (non-UI) have an ascent of 800 and a descent of 200, which makes for legibility issues. Meanwhile, Khmer OS Battambang has an ascent of 1638 and a descent of 410, granting much more clearance.

Font

NotoSerifKhmer-Regular.otf, NotoSansKhmer-Regular.otf, KhmerOSbattambang.ttf

Where the font came from, and when

Site: https://github.com/notofonts/khmer/releases/tag/NotoSerifKhmer-v2.003 Date: 2023-05-19

Site: https://github.com/notofonts/khmer/releases/tag/NotoSansKhmer-v2.003 Date: 2023-05-19

Site: https://github.com/wikimedia/mediawiki-extensions-UniversalLanguageSelector/tree/master/data/fontrepo/fonts/KhmerOSbattambang Date: 2022-04-16

Font Version

2.003 for both Noto fonts in question 1.10 2007 for Khmer OS Battambang

OS name and version

Windows 11 Home 22H2

Application name and version

LibreOffice Writer (LibreOffice 7.5.3.2 [X86_64])

Screenshot

Noto Sans Khmer Screenshot 2023-05-22 134432

Noto Serif Khmer Screenshot 2023-05-22 134256

Khmer OS Battambang Screenshot 2023-05-22 134320

simoncozens commented 9 months ago

Noto Sans Khmer and Noto Serif Khmer (non-UI) have an ascent of 800 and a descent of 200

I'm not sure this is right: typoAscender/hheaAscender/winAscent are all 1069, and typoDescender/winDescent/hheaDescender is 293. These are set according to the Google Fonts vertical metrics specification which, although not perfect, is the best compromise we've found.

At any rate, unfortunately changing these values after the font has been fielded is very disruptive, as it would lead to reflow of documents, so we're unlikely to be able to do that.