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Krzysztof kuhy Rudnicki
27f44cad4b
Every Flutter app still shipped the stock Flutter "beach" launcher icon, and none had an adaptive-icon descriptor at all. Rather than hand-drawing five one-off icons, define the family once and let each app contribute only an accent colour and a glyph. The family: a charcoal #1B1D21 field carrying one glyph in that app's own theme seed colour, at a single stroke weight. Glyphs are optically centred automatically - render.centre_offset rasterises a glyph alone, measures its ink box, and translates (never scales) the fragment, so a row of icons lines up while every icon keeps the exact family stroke weight. safe_box_overflow warns when a glyph exceeds the 560px adaptive-icon safe box; it caught three real overflows that a launcher mask would have clipped. The registry points dufs_client at ~/dufs-cloud/app: ~/dufs_client was a stale, remote-less checkout with an identical package name, since deleted. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
68 lines
2.6 KiB
Markdown
68 lines
2.6 KiB
Markdown
# app_icons — shared launcher icons for the Flutter apps
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One icon family across every Flutter/Dart app: a charcoal `#1B1D21` field with
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a single glyph in that app's own theme accent, drawn at one stroke weight and
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optically centred so a row of them lines up.
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## Commands
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```bash
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# what is registered
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PYTHONPATH=~/testsAndMisc python3 -m python_pkg.app_icons list
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# contact sheet for visual review: full size / circle-masked / 48dp
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PYTHONPATH=~/testsAndMisc python3 -m python_pkg.app_icons preview -o /tmp/sheet.png
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# write assets into every app repo and rebuild the Android mipmaps
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PYTHONPATH=~/testsAndMisc python3 -m python_pkg.app_icons generate --android
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# one app, plus the hicolor PNGs for a Linux desktop target
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PYTHONPATH=~/testsAndMisc python3 -m python_pkg.app_icons \
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generate --app todo --android --linux-out ~/todo/linux/icons
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```
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## What gets written
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Per app, into `<repo>/assets/icon/`:
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| Layer | Purpose |
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| --- | --- |
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| `icon` | Charcoal field + glyph. Legacy square launcher icon and Linux icon. |
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| `icon_foreground` | Glyph only, transparent. Adaptive-icon foreground layer. |
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| `icon_monochrome` | Glyph only, white. Android 13+ themed icons. |
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Both an `.svg` source and a 1024px `.png` are written for each, so a build
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never needs `rsvg-convert`. `flutter_launcher_icons` then turns the PNGs into
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the density buckets and `mipmap-anydpi-v26/ic_launcher.xml`.
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## Design constraints that bite
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- **Negative space ≥ half the stroke weight.** Strokes closer than that merge
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into a solid blob at launcher size. A fork whose tines sat exactly one stroke
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width apart rendered as a tulip.
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- **Ink must stay inside the 560px safe box.** Android masks adaptive icons to
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roughly the inner 66% of the canvas. `generate` warns when a glyph overflows.
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- **Stroked outlines can read wrong.** A stroked three-tine fork reads as a
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trident; a filled fork-and-knife pair reads as cutlery. Prefer a filled
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silhouette when the outline is ambiguous.
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- Glyph positioning inside the fragment is irrelevant — `render.centre_offset`
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measures the rendered ink and recentres it. Only the extents matter.
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## Adding an app
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See the `app-icon` skill (`~/.claude/skills/app-icon/SKILL.md`) for the full
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procedure. In short: add a glyph to `glyphs.py`, register the app in
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`apps.py`, wire `flutter_launcher_icons` into its `pubspec.yaml`, generate,
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review the contact sheet, then verify on the phone.
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## Tests
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```bash
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cd ~/testsAndMisc
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python3 -m pytest python_pkg/app_icons --cov=python_pkg.app_icons \
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--cov-report=term-missing
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```
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External tools (`rsvg-convert`, `magick`, `dart`) are mocked; the suite needs
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none of them installed.
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