Using this on a bitmap font produces garbled output

[SamusAranX]

I tried processing a bitmap font from the 5th gen iPod classic's firmware and it came out like this:

FontForge displays the contained glyphs no problem:

but it calls this set "18@4", which I assume refers to 18pt at 4 bits.
Is it possible that this tool expects 8-bit bitmaps?

[kisvegabor]

Is it possible that this tool expects 8-bit bitmaps?

I don't know it for sure, but from the result it seems it can be the issue. Do you know a way to convert the font to 8bit?

cc @puzrin

[puzrin]

This tool is for vector fonts. Although TTF allows the use of bitmaps, those are not supported at all. Behaviour with bitmap fonts is undefined.

[SamusAranX]

Understandable, thanks for the reply. Massive shame though, this would've been really useful.

[razor5k]

I would also like to have a native BDF (Bitmap Font) support with lv_font_conv. If displays with low resolution are used, only pixel based fonts looks acceptable. BDFs has already bitmap data included, isn't it possible to make lv_font_conv work with BDFs for instance?

[kisvegabor]

As a workaround please take a look at this: https://docs.lvgl.io/master/details/main-components/font.html#using-a-bdf-font