[Research] Add bezier-curve SDF generation via ttf-parser (research branch for #16)#27
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[Research] Add bezier-curve SDF generation via ttf-parser (research branch for #16)#27lseelenbinder wants to merge 2 commits into
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Add an alternative vector-based SDF generation path that computes signed distance fields directly from font bezier curve outlines, rather than from rasterized bitmaps. This improves rendering quality for complex scripts (Indic, Khmer, Burmese) where rasterization loses information. New modules in sdf_glyph_renderer: - outline.rs: Glyph outline data structures with bezier curve flattening - outline_sdf.rs: SDF algorithm using R-tree spatial indexing + winding number - ttf.rs: ttf-parser integration via OutlineBuilder trait - types.rs: Shared SdfGlyph/GlyphMetrics types (extracted from ft.rs) New in pbf_font_tools: - ttf_generate.rs: ttf-parser glyph generation pipeline (parallel to ft_generate.rs) CLI changes: - build_pbf_glyphs --backend bitmap|bezier flag to select SDF generation method New dependencies: ttf-parser (pure Rust font parser), rstar (R-tree spatial index) Both gated behind the "ttf-parser" feature flag. https://claude.ai/code/session_01MZQnJnULX397TRkQ6vpJms
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The two modules were tightly coupled (outline_sdf only operated on types from outline). Combining them removes a module boundary and the cross-module imports, keeping all outline geometry + SDF rendering in one place. https://claude.ai/code/session_01MZQnJnULX397TRkQ6vpJms
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Add an alternative vector-based SDF generation path that computes signed distance fields directly from font bezier curve outlines, rather than from rasterized bitmaps. This improves rendering quality for complex scripts (Indic, Khmer, Burmese) where rasterization loses information.
New modules in sdf_glyph_renderer:
New in pbf_font_tools:
CLI changes:
New dependencies: ttf-parser (pure Rust font parser), rstar (R-tree spatial index) Both gated behind the "ttf-parser" feature flag.
https://claude.ai/code/session_01MZQnJnULX397TRkQ6vpJms