doodle/cmd/doodad
Noah Petherbridge 82884c79ae Signed Levels and Levelpacks
Add the ability for the free version of the game to allow loading levels that
use embedded custom doodads if those levels are signed.

* Uses the same signing keys as the JWT token for license registrations.
* Levels and Levelpacks can both be signed. So individual levels with embedded
  doodads can work in free versions of the game.
* Levelpacks now support embedded doodads properly: the individual levels in
  the pack don't need to embed a custom doodad, but if the doodad exists in
  the levelpack's doodads/ folder it will load from there instead - for full
  versions of the game OR when the levelpack is signed.

Signatures are computed by getting a listing of embedded assets inside the
zipfile (the assets/ folder in levels, and the doodads/ + levels/ folders
in levelpacks). Thus for individual signed levels, the level geometry and
metadata may be changed without breaking the signature but if custom doodads
are changed the signature will break.

The doodle-admin command adds subcommands to `sign-level` and `verify-level`
to manage signatures on levels and levelpacks.

When using the `doodad levelpack create` command, any custom doodads the
levels mention that are found in your profile directory get embedded into
the zipfile by default (with --doodads custom).
2023-02-18 17:37:54 -08:00
..
commands Signed Levels and Levelpacks 2023-02-18 17:37:54 -08:00
main.go Rename Go module 2022-09-24 15:17:25 -07:00
README.md Add doodad.exe binary and PNG to Drawing Converter 2018-10-16 12:26:41 -07:00

doodad.exe

The doodad tool is a command line interface for interacting with Levels and Doodad files, collectively referred to as "Doodle drawings" or just "drawings" for short.

Commands

doodad convert

Convert between standard image files (bitmap or PNG) and Doodle drawings (levels or doodads).

This command can be used to "export" a Doodle drawing as a PNG (when run against a Level file, it may export a massive PNG image containing the entire level). It may also "import" a new Doodle drawing from an image on disk.

Example:

# Export a full screenshot of your level
$ doodad convert mymap.level screenshot.png

# Create a new level based from a PNG image.
$ doodad convert scanned-drawing.png new-level.level

# Create a new doodad based from a BMP image, and in this image the chroma
# color (transparent) is #FF00FF instead of white as default.
$ doodad convert --key '#FF00FF' button.png button.doodad

Supported image types:

  • PNG (8-bit or 24-bit, with transparent pixels or chroma key)
  • BMP (bitmap image with chroma key)

The chrome key defaults to white (#FFFFFF), so pixels of that color are treated as transparent and ignored. For PNG images, if a pixel is fully transparent (alpha channel 0%) it will also be skipped.

When converting an image into a drawing, the unique colors identified in the drawing are extracted into the palette. You will need to later edit the palette to assign meaning to the colors.