Module font 

Bundled Liberation Sans outlines (ttf-parser).

Replaces Python fontTools for advances, ink bounds, and glyph contours. Contours are sampled (8 steps per curve) to match the old ContourPen, then assembled with even-odd fill into crate::geom::Shape.

Chem scripts (H-counts, charges) are fake sub/superscripts: scale by crate::metrics::SCRIPT_SCALE, buffer the outline to restore stem weight, and cache the result. Dummy * uses a custom star at STAR_FRAC.

Structs

ChemGlyph

One chem-label glyph with script role and face (markup bold/italic).

FaceMetrics

Typographic constants in em units (font +Y up).

GlyphMetrics

One character metrics in em units (font +Y up).

Enums

FaceStyle

Liberation Sans face variant.

ScriptRole

Sub / super / normal draw role for chem label glyphs.

Functions

compile_chem_shapes

Place a chem glyph run in SVG space (+Y down) with baseline at y.

compile_text_shapes

Compile plain text to SVG-space glyph geometry (+Y down).

face_metrics

Face metrics for a Liberation Sans style.

glyph_metrics

Metrics for a single Unicode scalar.

outline_chem_run_em

Outline a chem glyph run in em space (+Y up). Returns (shape, advance_em).

outline_glyph_em

Outline one character in em space (+Y up), optionally as a fake script.

outline_run_em

Outline plain Unicode in font space (+Y up); return (shape, advance_em).

outline_star_em

Custom five-point star in em units (centered on advance, mid cap-height).