f08369bbf0
Add cargo xtask gen-shape-db command that walks font directories, rasterizes glyphs at 32x32 via fontdue, computes pHash, and outputs build/glyph-shapes.json. Implementation details: - Fontdue integration for TrueType/OpenType font loading - 32x32 bitmap rasterization with centering - DCT-based pHash computation (32x32 DCT → 8x8 low-freq → median threshold) - Character frequency data for collision resolution - Deduplication by (phash, char) pairs - Cross-character collision handling (keep higher-frequency char) - Sorted output by pHash ascending Artifacts: - build/frequency.json: Character frequency rankings - build/README.md: Command documentation and usage Acceptance criteria: - ✅ cargo xtask gen-shape-db --fonts <dir> produces valid JSON - ✅ Deterministic output (byte-identical on same inputs) - ✅ Fontdue integration and 32x32 rasterization - ✅ pHash computation via DCT - ⚠️ No system fonts for full integration test (documented) Closes: pdftract-2aq0
99 lines
1 KiB
JSON
99 lines
1 KiB
JSON
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