BUG that Khmer language displays incorrectly using ttf text

[cxcxiaochuan]

The framework displays Khmer TTF text content incorrectly. The text content pattern displayed is different from the original text content pattern that needs to be displayed, and the Khmer TTF text content is easily triggered

AXLOG("LabelTextFormatter error: can't find letter definition in font file for letter: 0x%x",character);

[rh101]

Can you please show screenshots of actual and expected output?

Also, are you able to provide the TTF font file that you use for the Khmer text?

[cxcxiaochuan]

Can you please show screenshots of actual and expected output?

Also, are you able to provide the TTF font file that you use for the Khmer text?

OK, wait a minute.

[cxcxiaochuan]

The original text on the button below is as follows:ចាប់ផ្តើម

But the content displayed by the program becomes the following screenshot

[cxcxiaochuan]

This is the Khmer ttf file our app uses:
NotoSansKhmer-SemiBold.zip

[rh101]

Can reproduce this issue.

Just as a test, using the system font, it displays correctly:

[cxcxiaochuan]

Yes, it will display correctly when using system characters, but will display incorrectly when using ttf characters.

[rh101]

After looking into this, and as a complete guess, the problem may be in Label::multilineTextWrap or FontAtlas::prepareLetterDefinitions, but I'm not familiar with the logic to figure out why.

Also, the text that reproduces the issue can be narrowed down to the following:
ផ្តើ

which ends up rendering as:

The problem could also be that the generated font atlas has bitmaps of the individual letters that would be combined to make up that glyph, but once they are in the font atlas, they look nothing like what they should be when combined together. So, the rendering code is attempting to create a single ផ្តើ from individual bitmaps, and I don't understand how that would ever work, since they're all bitmap images of individual characters. This is all assuming that the FontAtlas contains bitmaps, and that I am not confused about how it works (please correct me if I'm wrong).