Krzysztof kuhy Rudnicki
7f2c1e19df
style.BACKGROUND changing doesn't help if flutter_launcher_icons reads a stale value from pubspec.yaml's own independent config -- that's exactly what just happened across all 6 apps during the warm-palette rollout: the generated PNG assets were correct, but Android's actual home-screen icon (the adaptive icon: background color + foreground drawable, not the legacy ic_launcher.png mipmap) stayed on the old color, invisible until a physical device check caught it. sync_pubspec_background() now rewrites the line in place before every run_flutter_launcher_icons() call, so this can't silently drift again. Verified: 43/43 tests (4 new), 100% line+branch coverage on generate.py. |
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|---|---|---|
| .. | ||
| tests | ||
| __init__.py | ||
| __main__.py | ||
| apps.py | ||
| cli.py | ||
| generate.py | ||
| glyphs.py | ||
| preview.py | ||
| README.md | ||
| render.py | ||
| style.py | ||
app_icons — shared launcher icons for the Flutter apps
One icon family across every Flutter/Dart app: a charcoal #211D1B field with
a single glyph in the shared unified-design-system accent (#B8862E),
drawn at one stroke weight and optically centred so a row of them lines up.
Commands
# what is registered
PYTHONPATH=~/testsAndMisc python3 -m python_pkg.app_icons list
# contact sheet for visual review: full size / circle-masked / 48dp
PYTHONPATH=~/testsAndMisc python3 -m python_pkg.app_icons preview -o /tmp/sheet.png
# write assets into every app repo and rebuild the Android mipmaps
PYTHONPATH=~/testsAndMisc python3 -m python_pkg.app_icons generate --android
# one app, plus the hicolor PNGs for a Linux desktop target
PYTHONPATH=~/testsAndMisc python3 -m python_pkg.app_icons \
generate --app todo --android --linux-out ~/todo/linux/icons
What gets written
Per app, into <repo>/assets/icon/:
| Layer | Purpose |
|---|---|
icon |
Charcoal field + glyph. Legacy square launcher icon and Linux icon. |
icon_foreground |
Glyph only, transparent. Adaptive-icon foreground layer. |
icon_monochrome |
Glyph only, white. Android 13+ themed icons. |
Both an .svg source and a 1024px .png are written for each, so a build
never needs rsvg-convert. flutter_launcher_icons then turns the PNGs into
the density buckets and mipmap-anydpi-v26/ic_launcher.xml.
Design constraints that bite
- Negative space ≥ half the stroke weight. Strokes closer than that merge into a solid blob at launcher size. A fork whose tines sat exactly one stroke width apart rendered as a tulip.
- Ink must stay inside the 560px safe box. Android masks adaptive icons to
roughly the inner 66% of the canvas.
generatewarns when a glyph overflows. - Stroked outlines can read wrong. A stroked three-tine fork reads as a trident; a filled fork-and-knife pair reads as cutlery. Prefer a filled silhouette when the outline is ambiguous.
- Glyph positioning inside the fragment is irrelevant —
render.centre_offsetmeasures the rendered ink and recentres it. Only the extents matter.
Adding an app
See the app-icon skill (~/.claude/skills/app-icon/SKILL.md) for the full
procedure. In short: add a glyph to glyphs.py, register the app in
apps.py, wire flutter_launcher_icons into its pubspec.yaml, generate,
review the contact sheet, then verify on the phone.
Tests
cd ~/testsAndMisc
python3 -m pytest python_pkg/app_icons --cov=python_pkg.app_icons \
--cov-report=term-missing
External tools (rsvg-convert, magick, dart) are mocked; the suite needs
none of them installed.