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MDP GIMP Plugin

An attempt to add MDIPack support to GIMP via plugin.

About

MDIPack

The MDIPack file format is used by applications such as mdiapp+, FireAlpaca, MediBang Paint, LayerPaint HD, and probably more.

Plugin

I wanted to make an open source implementation of the file format that integrates properly with a well known open source Image Editing Application.

I made a plugin for Krita (krita-plugin-mdp) that worked as a POC, but adding proper impex support to Krita requires compiling from source.

GIMP has a decent Plugin API which allows for me to add proper support for the file format.

Build

I am currently using libgimp3 and MSYS2 MINGW64. This plugin is probably going to remain incomplete until GIMP 3 has a release date.

Ideas

Frida-based Mode

I'm looking into the possibility of using Frida to use FireAlpaca in the background.

The issues with this is that:

  • I don't know how to use Frida (this is the main issue)
  • The plugin wouldn't work Linux unless Frida can run under WINE
  • The plugin would require different code for macOS (since the application works differently)
  • If we read the data from memory:
    • Lots of RE required to figure out structure
  • If we use the PSD export feature:
    • Potential Data loss in conversion from MDP to PSD
    • No way to call the file-psd plugin from another GIMP plugin

Notes

mdiapp+ is developed by nattou.org and published by PGN Inc. FireAlpaca is developed and published by PGN Inc.

I believe this plugin is compliant under FireAlpaca's Terms of Service as of the time this is being published.

I would like to thank Um6ra1 for his notes on the file format and Bowserinator for translating said notes from Japanese to English.

I would like to thank 42aruaour for directing me to the nattou.org group, who created the spec as well as most of applications that use it.

Finally, I would like to thank rsuzaki for sharing a lot of information on the MDIPack file format (link). This information was extremely helpful in order to get this plugin to the state that it is.