Why a tool is needed? To edit the layering?
Because even if its kind of extra work, that can be done with sprite editing programs, the only thing really needed would be a sprite sheet to work over.
If you can share a bit of info on how are you editing the characters and stages probably we can figure something out.
Here's a tutorial Sics
wrote, for those who are interested in incorporating their own stages:
PhotoScape has two very interesting functions built in, which are CRUSHER and WALL.
Considering that each stage measures 384x192, it can simply be cut into 128x8 strips.
0. (Reduces its palette to 4 colors)
1. You load the stage in TROCEADOR, you go to the WIDTH, HEIGHT tab, and you configure it 128x8.
2. Press TROCEAR and in the options box set the IMAGE FORMAT to PNG.
Ready! Now a folder called OUTPUTS will be created where all the fragments of the image will be saved. Loads
the cutouts in the WALL tool (also from PhotoScape) using the ADD button.
You will have something like this:
1. In COLUMNS you put it in 1.
2. In CANVAS you put KEEP THE ORIGINAL SIZE.
3. Keep MARGIN, SPREAD, and ROUNDING at Zero.
As you can see here, the black lines found after every three graphic stripes are missing:
To solve this, create a 128x8 black strip that you will duplicate to fill in the empty spaces and then:
3. You save the file in PNG format, you chop it again, but now in 128x128 tiles to pass them to the game: beer:
(Sorry, I used Spanish apps, I don't think it's that hard to understand anyway)
The sprites are much more complex to be distributed in this way:
everything is within the project thread