Thank you.
I hope that some day we can obsolete this technique (because the single build operation is slow) and use more dynamic font atlas.

If your project has known text, I think you can use ImFontAtlas::GlyphRangesBuilder to build atlas based on the character you use.

If your project requires display of chat or user name, even with 8000+ ideogram it might be problematic?
I am curious how you use this!

PS: Also, could you provide your data source for the 2136 and Joyo lists?
The reason I didn't include the 2136 is that I didn't have an easy source that I could parse.

the GetGlyphRangesChinese is too many words that I never know, but I need common words in my UI.
GetGlyphRangesJapanese is a good idea, it contained regular chinese of ShiftJIS. but it lost '關', it has '関' in Shift-JIS only.
So I mixed GB2312 plane 1, Big5 Common Word and Shift-JIS joyokanji, That all is regular chinese word.

Also I think it may not be important in common rules if all user known english :)

Joyo Kanji 2136 Source : http://x0213.org/joyo-kanji-code/index.html

Thank you

Hello @metora,
First I must apologize that I never got around to merge this.

I believe #3627 now has superseded this. Neither solution is perfect but it the adopted ranges used by #3627 appears to be a general good solution in the meantime.

I however noticed that your PR also adds the https://en.wikipedia.org/wiki/Bopomofo ranges:

0x3100, 0x312F, // Bopomofo

Can you clarify, if you remember, why this was added to your JoyoKanji function?

Closing this, but if you have an answer about the Bopomofo range it may be useful to know.
Thank you again for your time.