Colors are not being generated when using bitmap fonts

[JoeFreeman-Adv]

Describe the bug

When using bitmaps in place of font files colors are only being partly generated (background colors appear to be working) - everything else is in black and white.

This seems to happen on Mac and Android. (According to discord - see links down below)

Steps To Reproduce

Placing .bmp or .png file into the data/font folder and entering the corresponding file name into font.json. Open the game.

Expected behavior

Fonts are being generated from bitmaps with the full range of colors.

Screenshots

Ingame:

Color menu:

Versions and configuration

• OS: macOS Mojave Version 10.14.6
• Game Version: 0.D-9868-gf04c6d5815
• Graphics version: Tiles
• Mods loaded: no mods, bug occures when starting the game

Additional context

The issue has been reported by several people on discord, twice on Mac OS and once on Android.

1.: https://discordapp.com/channels/598523535169945603/598529538015887372/650983242392010753
2.:https://discordapp.com/channels/598523535169945603/642349261320880128/652738883863183362
3.: https://discourse.cataclysmdda.org/t/color-generation-of-image-fonts/22165

I've included my debug.log:
debug.log

[ZhilkinSerg]

Did you try using your font in older versions? Is it working there?

[JoeFreeman-Adv]

Yes, I've tried the latest stable version. Same problem:

I've also used several image files. For example the one included in the new Overmap Mod by @Larwck to rule out a issue with the files.

[ZhilkinSerg]

What about more distant versions - e.g 0.C stable or 0.B stable?

[JoeFreeman-Adv]

I'm having a hard time finding a version of 0.C stable or 0.B stable that works on my Mac. I tried to compile it myself but I'm getting a bunch of errors.

[JoeFreeman-Adv]

Because I couldn't compile the older versions of the game myself I found and downloaded this one:
0.C-E006

Still the same bug:

[ZhilkinSerg]

That is good. It is not some recent regression then.

[kevingranade]

This issue has been mentioned on Cataclysm: Dark Days Ahead. There might be relevant details there:

https://discourse.cataclysmdda.org/t/trouble-with-graphical-overmap/22435/7

[JoeFreeman-Adv]

I just checked if anything has changed, but the bug still persists.

The sidebar is rendered using a truetype font and is working just fine. Using a .png for the actual map and overmap however still doesn't work. Colors are only being partially generated.