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Vitor PamplonaandClaude Opus 5.5
d6a5382e58
Codex (run locally) added AGENTS.md, .agents/skills symlinks and a .codex push hook; this makes both agents read one copy of everything: - AGENTS.md is now the single source of the project rules. .claude/CLAUDE.md imports it with @../AGENTS.md and keeps only Claude-specific notes; the res/ guide moves to amethyst/src/main/res/AGENTS.md the same way. - .agents/skills/<name> are symlinks to .claude/skills/<name>, never copies. - The push checks move to tools/agent-hooks/, run by .claude/settings.json, .codex/hooks.json (matched to Bash and the PR tool) and CI. The Codex hook now also runs spotless. The shared gate accepts Codex's payloads. - New agent_config_check.py (pre-push and CI) enforces the layout: symlinks, CLAUDE.md imports, AGENTS.md under Codex's 32 KiB doc limit, description length, the combined skill-list budget, and that every path a skill cites exists. - Fixes the Compose-escaping pre-push hook, which exited 1 on a hit and so never blocked a push (PreToolUse blocks only on exit 2). - Live docs point at AGENTS.md instead of .claude/CLAUDE.md. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
47 lines
2.1 KiB
Markdown
47 lines
2.1 KiB
Markdown
# Amethyst icon font
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Builds `amethyst_icons.ttf` from the Kotlin `ImageVector` icons in
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`commonsUI/src/commonMain/kotlin/com/vitorpamplona/amethyst/commons/icons/`.
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## Why
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`Icon(imageVector = …)` calls `rememberVectorPainter`, and a `VectorPainter`
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rasterises its paths into a cached graphics layer **per instance**. A feed therefore
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re-rasterised the same handful of glyphs once for every card scrolled in. A font glyph
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is a blit from the shared text atlas instead, shared across every call site in the app
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for free — no `CompositionLocal` plumbing, no per-screen scoping.
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Measured on the uniform-corpus macrobenchmark (SM-T220, three arms, 0.2% noise floor):
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| approach | frame P90 | overrun P90 | artwork |
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|---|---|---|---|
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| one shared `VectorPainter` per icon | −8.2% | −14.2% | unchanged |
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| MaterialSymbols glyph substitutes | −10.4% | −16.0% | **changes** |
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| **this font** | **−10.7%** | **−17.4%** | unchanged |
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| ceiling: draw no icons at all | −12.7% | −22.9% | n/a |
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## Usage
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pip install fonttools
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python3 tools/icon-font/build_icon_font.py <icons-dir> <out.ttf> <out.kt>
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See the "Amethyst's own icons are also a font" section of `AGENTS.md` for the
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mandatory regeneration step and why both outputs must be committed together.
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## How it works
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The `ImageVector` builder DSL maps 1:1 onto SVG path commands (`moveTo` → `M`,
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`curveToRelative` → `c`, …; none of the icons use `arcTo`), so the script extracts the
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path data, emits an SVG `d` string, and draws it into a TrueType glyph via fontTools —
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converting cubics to quadratics and flipping the y axis, since SVG grows downward and
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font outlines grow upward from the baseline.
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Font metrics deliberately mirror the bundled `material_symbols_outlined.ttf`
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(unitsPerEm 960, ascent 1056, descent −96, advance 960) so the glyphs align with
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existing MaterialSymbols call sites and `Icon()` sizing. Generated outlines land within
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a few units of Google's own: our `Like` spans (78,94)–(882,851), their heart
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(80,120)–(880,854).
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An icon whose path data the parser cannot reach is reported and skipped rather than
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silently emitted empty; it must keep using its `ImageVector`.
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