BMFont ignores draw while font less 2 pixels

[sky94520]

Tested versions

Godot 4.3dev4

System information

Mac OS 14.3 - Godot4.3dev4 - Vulkan (Forward+)

Issue description

I use Pixel fonts to generate BMFont and use it in Godot, but I found it exists issue for those chars such as,.-'", and I found those chars all less 2 pixels.

for example, I input the following string to Label:

-+123456789.!`Ii,."

the UI is as follows:

Steps to reproduce

1. Download fusion-pixel-font-10px-monospaced-ttf-v2024.04.05.zip, extracting the zip.
2. Download fontbm, move usion-pixel-font-10px-monospaced-ttf-v2024.04.05/fusion-pixel-10px-monospaced-zh_hans.ttf to fontbm root directory, compile the source code and execute the following command to generate BM font.

./fontbm --font-file fusion-pixel-10px-monospaced-zh_hans.ttf --font-size 10 --output damage-number

then move damage-number.fnt and damage-number_0.png to Godot project.
3. Create a Label, and set Theme Overrides->Fonts using damage-number.fnt.
4. Input the following string -+123456789.!`Ii,.".

Minimal reproduction project (MRP)

TestBMFont.zip

[bruvzg]

Should be fixed by #90349, for previous version in should be fixable by adding 1px padding on each side (usually adding padding is a good idea, since packing glyphs without it will not work well with texture filtering).

[sky94520]

Hi @bruvzg I do add padding, I use the command to generate a new font file, but it is same as before.

./fontbm --font-file fusion-pixel-10px-monospaced-zh_hans.ttf --font-size 10 --output damage-number --padding-left 1 --padding-right 1

[bruvzg]

I use the command to generate a new font file, but it is same as before.

Vertical padding should be set as well: --padding-up 1 --padding-down 1

[sky94520]

Thank you @bruvzg, I add --padding-left 1 --padding-right --padding-up 1 --padding-down 1 to regenerate font file, it is correct.