Re: [PATCH v5 0/2] MR5633: win32u: Use the first vertical alternates table regardless of script.

[Akihiro Sagawa (＠sgwaki)]

On Fri Nov 15 14:46:06 2024 +0000, Nikolay Sivov wrote:
> I think the remaining question here is if we want to remove script/lang
> lookup logic entirely, or instead prioritize. @sgwaki, any idea if it's
> possible to test that? Testing manually is fine. To be clear, test font
> should have at least two differing vert features, with second feature
> being testable with specific script/lang pair, if that is possible to
> achieve with plain gdi API at all.

I manually tested the vertical features using a specially crafted TrueType file.

The font file displays different circled numbers as vertical substitutes for Japanese punctuation marks (U+3001, U+3002) based on its lookup table.

If the implementation chooses:
 - the first vert feature, i.e. no script/lang lookup, the app shows ① (U+2460's glyph).
 - the first script/lang tag (@@@@), it shows ② (U+2461's).
 - the 'DFLT' script, it shows ③ (U+2462's).
 - the 'kana' script, it shows ④ (U+2463's).

What we can see is ① with plain gdi API.

![Capture](/uploads/ce5cba3c12e0debd2bdac94fd017d842/Capture.png)

See [gsub.txt](/uploads/9d5ef683f937fc0b48f9f7e833fab930/gsub.txt) file in ttx format for details, please.