Can't use custom .png logos in bootrom

[maij]

Is it possible to replace the Sameboy with another logo? I have tried various 128 x 24 2-bit images, but they all result in logo corruption when I build the project.

I am using the latest rgb* libraries (built from source at the latest release). Is there a special set of rules to make this work?

Examples

Vertical stripes

1px stripes

2px stripes

Gameboy text

Fails to compile with following message:

rgbgfx  -Z -u -c embedded -o build/obj/BootROMs/SameBoyLogo.2bpp BootROMs/SameBoyLogo.png
cc -std=c99 -Wall -Werror BootROMs/pb12.c -o build/pb12
~/SameBoy/build/pb12 < build/obj/BootROMs/SameBoyLogo.2bpp > build/obj/BootROMs/SameBoyLogo.pb12
pb12: BootROMs/pb12.c:90: main: Assertion `outctl != 1' failed.
Aborted (core dumped)
make: *** [Makefile:474: build/obj/BootROMs/SameBoyLogo.pb12] Error 134

[LIJI32]

The SameBoy logo is compressed under a scheme that is somewhat hardcoded to the SameBoy logo itself:

1. It requires 3 colors (not 2 and not 4) in a particular palette. Using a different palette can trigger an assertion error like the one you've posted.
2. It assumes at specific amount of unique tiles in a specific layout (There are two duplicate tiles in SameBoy's logo, being shared between E and B). The stripe examples only have one unique tile.
3. Boot ROM space is extremely tight, logos that are slightly less compressible than the current logo simply won't fit.

[maij]

Thanks for the response, may I ask what tools you used to create the SameBoy logo? I have tried toying with my own in GIMP but I haven't made any headway there.

[LIJI32]

Any tool that properly supports indexed PNGs should work. I specifically use Adobe Photoshop.

[maij]

Thanks, I'll close this issue now. I will play around with different bootrom code.