Unicode chars don't get drawn

mbolis commented 3 months ago

Ebitengine Version

v2.7.5

Operating System

[ ] Windows
[ ] macOS
[X] Linux
[ ] FreeBSD
[ ] OpenBSD
[ ] Android
[ ] iOS
[ ] Nintendo Switch
[ ] PlayStation 5
[ ] Xbox
[ ] Web Browsers

Go Version (`go version`)

go1.22.1 linux/amd64

What steps will reproduce the problem?

Draw some Unicode runes (from the "Supplemental Mathematical Operators" block, in my case)

fontPath, err := findfont.Find("Roboto-Regular")
if err != nil {
    panic(err)
}

fontReader, err := os.Open(fontPath)
if err != nil {
    panic(err)
}
defer fontReader.Close()
fontSource, err = text.NewGoTextFaceSource(fontReader)
if err != nil {
    panic(err)
}

face := text.GoTextFace{
    Source: fontSource,
    Size:   24,
}
opts = text.DrawOptions{}
text.Draw(screen, "⨯", &face, &opts) // example character is '⨯' (\u2a2f, Vector or Cross Product)

What is the expected result?

The ⨯ glyph gets drawn on the screen

What happens instead?

An unrecognized symbol glyph gets drawn instead immagine

Anything else you feel useful to add?

I tried with different fonts, and the result is always similar

hajimehoshi commented 3 months ago

Apparently Roboto doesn't have a glyph for "⨯" (U+2A2F), so there is nothing Ebitengine can do.

mbolis commented 3 months ago

Excuse me @hajimehoshi I'm sure you are more knowledgeable than me in this regard. If Roboto doesn't have that glyph (which I'm sure is the truth), then why is a text editor like LibreOffice showing the glyph when I input it while using Roboto? Is it implementing some sort of fallback?? Then I wonder what font it is using as fallback! Thank you, and sorry for raising a nonexistent issue

hajimehoshi commented 3 months ago

If Roboto doesn't have that glyph (which I'm sure is the truth), then why is a text editor like LibreOffice showing the glyph when I input it while using Roboto? Is it implementing some sort of fallback?? Then I wonder what font it is using as fallback

Such applications likely have fallbacks and fallback fonts depends on applications.

mbolis commented 3 months ago

As a record for posterity, I discovered the fallback font using the following command:

$ fc-match :charset=2a2f
DejaVuSans.ttf: "DejaVu Sans" "Regular"

Here of course 2a2f is the Unicode codepoint for ⨯

hajimehoshi / ebiten