Updating the App Icon

assets/app_icon.png is the single source for the application icon. JUCE consumes it via ICON_BIG / ICON_SMALL in magda/daw/CMakeLists.txt and generates the platform icons at configure time:

• macOS -> Icon.icns (referenced by CFBundleIconFile in the app bundle)
• Windows -> embedded .ico
• Linux -> release.yml copies app_icon.png to the 256x256 hicolor path directly

There is no separate .icns/.ico to edit and no generation script to run by hand. Update the icon by replacing app_icon.png and rebuilding.

Conventions

• The source must be a square PNG, 1024x1024.
• Each iteration is kept in assets/ as Bold-M, Bold-M2, Bold-M3, ... (the current mark at the time of writing is Bold-M5). Add the next mark as Bold-M<N>.png and keep the prior ones as history. app_icon.png is always a byte-for-byte copy of the chosen mark.

Steps

1. Drop the new mark into assets/ (e.g. assets/Bold-M6.png).

2. Point app_icon.png at it:

   .claude/skills/app-icon/update-app-icon.sh assets/Bold-M6.png
   

   The script validates the PNG is square (1024x1024 by convention), copies it over assets/app_icon.png, and prints an md5 so you can confirm the swap.

3. Reconfigure and rebuild so the embedded icon regenerates:

   make configure && make debug
   

   CMake regenerates Icon.icns (macOS) and the .ico (Windows) from app_icon.png at configure time, then the build copies the fresh icns into the app bundle. A plain make debug will not pick up the change -- ninja does not track app_icon.png as a dependency, so the reconfigure is required. (make rebuild also works, since it cleans and reconfigures.)

4. Commit app_icon.png and the new source together:

   git add assets/app_icon.png assets/Bold-M6.png
   git commit -m "chore: new app icon (Bold-M6)"
   

Notes

• The icon cannot be verified visually from the build alone (it shows in the dock / taskbar at runtime). A clean make debug confirms the generation step accepted the PNG; the user sees the result when they launch the app.
• Follow the git and building skills for branching and build commands.