If you are here is because you want to learn about Aseprite source code. We'll try to write in these README.md files a summary of each module/library.

Modules & Libraries

Aseprite is separated in the following layers/modules:

Level 0: Completely independent modules

These libraries are easy to be used and embedded in other software because they don't depend on any other component.

allegro: Modified version of Allegro library, used for keyboard/mouse input, and drawing 2D graphics on screen.
base: Core/basic stuff, multithreading, utf8, sha1, file system, memory, etc.
css: Pseudo-style sheet library.
fixmath: Fixed point operations (original code from Allegro code by Shawn Hargreaves).
flic: Library to load/save FLI/FLC files.
scripting: JavaScript engine.
undo: Generic library to manage a history of undoable commands.

Level 1

cfg (base): Library to load/save .ini files.
gen (base): Helper utility to generate C++ files from different XMLs.
gfx (fixmath): Abstract graphics structures like point, size, rectangle, region, color, etc.
net (base): Networking library to send HTTP requests.
webserver (base): HTTP web server (based on mongoose)

Level 2

doc (base, fixmath, gfx): Document model library.
she (allegro, base, gfx): A wrapper for the Allegro library.

Level 3

filters (base, doc, gfx): Effects for images.
render (base, doc, gfx): Library to render documents.
ui (base, gfx, she): Portable UI library (buttons, windows, text fields, etc.)
updater (base, net): Component to check for updates.

Level 4

iff (base, doc, render): Image File Formats library (load/save documents).

Level 5

app (allegro, base, doc, filters, fixmath, gfx, iff, render, scripting, she, ui, undo, updater, webserver)

Level 6

main (app, base, she, ui)

Debugging Tricks

On Windows, you can use F5 to show the amount of used memory. Also Ctrl+Shift+Q crashes the application in case that you want to test the anticrash feature or your need a memory dump file.