Thai text are not displayed at all

[bitigchi]

See title and screenshot. Missing Thai font.

[bitigchi]

screenshot

[nephele]

Looks like the font is in noto_regional, "Noto Sans Thai"
There is no fallback at all in app_server for fonts in Noto Regional so that explains no chars, you can try those chars in font demo if you have Noto Sans Thai selected, or if you select that font in StyledEdit.

I am not sure how to proeed, potentially the entire list of regional noto fonts could be in the app_server fallback list, which raises the question if that should be de-hardcoded and noto-regional just adds to it (and e.g a "klingon font" aswell, etc.)

(relevant code ​https://git.haiku-os.org/haiku/tree/src/servers/app/font/GlyphLayoutEngine.h#n326 )

It looks like Thai is enabled in beta2 FirstBootPrompt (didn't try installer but running system), so this may pose a problem.

[nephele]

Seems that code would be fine with adding non-existant fonts to the list, so potentially I could just add Noto Sans Thai as an item (And maybe it should be split out so the installation does not need the entire noto_regional package)

[bitigchi]

screenshot1

[bitigchi]

screenshot2

[bitigchi]

It looks like even with fonts installed, it does not display at all. See screenshots.

Edit: On StyledEdit with font selected, letters display.

[nielx]

Moving to R1beta2 and upgrading it to critical (for the moment), as this needs to be discussed whether we can ship the beta without supporting the Thai translation properly.

[nielx]

So what I don't understand yet is whether the Thai fonts are currently included or not.

[pulkomandy]

I will look into this during this weekend (which starts tomorrow for me). I don't know if the font will be enough, as this may also need some changes to the font rendering code to properly assemble the letters together. If that's the case I'm not sure it can be done in time for beta2, but we'll see.

[bitigchi]

No, they are not included – yet. Still, a patch is needed to get the font system working.

Plus a review from a Thai speaker, whether everything is rendering okay or not.

[pulkomandy]

Useful reference on the rendering: ​https://linux.thai.net/~thep/thaisupp/

I think at least the shaping and the word-breaking will be problematic. But we'll see what happens.

[diver]

I wonder what happens with the scrollbar here?

[pulkomandy]

Replying to bitigchi:

It looks like even with fonts installed, it does not display at all. See screenshots.

Edit: On StyledEdit with font selected, letters display.

Yes, this does not work "magically", the font overlay "system" (or hack, I should say) has to be adjusted.

[sompon]

Replying to pulkomandy:

Useful reference on the rendering: ​https://linux.thai.net/~thep/thaisupp/

I think at least the shaping and the word-breaking will be problematic. But we'll see what happens.

I am a native Thai, and I can read what you have shown.

[waddlesplash]

Fixed in hrev54241.

[nielx]

Is it fixed? A recent build of the R1Beta2 branch still shows emptiness when I select Thai in FirstBootPrompt. If I understand correctly to really fix this, we should also provide the font.

[pulkomandy]

Yes, I have updated the Noto package to include the font, but the copy of it that's shipped with the image is not updated yet. We need to update it and then it will work.