Levi Neuwirth
4132a7ac05
Self-review of the inter-staff solve found a real bug: stroke->staff attribution reused component_glyph, whose fallback picks the nearest glyph by X ALONE. That is correct for a SLOT — both staves of a system share their x columns, hence their spring slots, so the horizontal delta is the same either way — but wrong for a STAFF: it handed a lower-staff stem to the UPPER staff's notehead. The stem then kept the wrong vertical shift and tore off its own head (measured worst stem->notehead distance 5.837 on the two-staff fixture vs 1.150, the stem x-inset, on the single-staff one), and it polluted the upper staff's content extent, inflating the computed gap. Fix: the staff attribution uses a 2-D nearest for that fallback (a ledger still resolves via owning_glyph's shared Pitch source; a staff line via its Staff source). component_glyph is unchanged and still serves the horizontal path. Also corrected: staff-attributed primitives now contribute their y ONLY through the shifted path (Extent::add_x for x, add_y for the shifted staff extent), so a lower staff's UNSHIFTED content can no longer inflate a system's max_y. Dead Extent::add removed. The corrected attribution yields a smaller, more accurate separation (two-staff view_box height 36.1 -> 31.1). Regression multi_staff_stems_stay_on_their_own_ staff (verified to fail at 5.837 without the fix). Only the two-staff engrave golden churned; single-staff goldens byte-stable. 948 tests, clippy 0, docs -D warnings, conformance 8/8. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> |
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| tools | ||
| Cargo.toml | ||
| DECISIONS.md | ||
| README.md | ||
README.md
epiphany-render-svg
Agent I's SVG renderer behind the Epiphany RenderIR interface (spec
Chapter 7): turns a ResolvedLayoutIR into well-formed SVG 1.1, drawing each
glyph from genuine Bravura SMuFL data — inline outline <path>s by default
(GlyphMode::PathOutline), or <text> set in an @font-face-embedded Bravura
subset (GlyphMode::EmbeddedFont). It is the visible end of the v0
Score → layout IR pipeline.
Status
The Score → layout IR → SVG pipeline renders recognizable notation — clefs,
noteheads at clef-relative staff positions, accidentals, key/time signatures,
rests, barlines, and the staff lines and stems that connect them. Output is
golden-locked against both the interface-only stub solver and Agent I's real
epiphany-engrave solver (whose horizontal spacing pass re-spaces the glyphs),
and the layout round-trip (criterion 6) runs through both. What the renderer
itself guarantees, independent of engraving quality: real Bravura glyphs,
provenance preserved to the score graph, output XML-valid and deterministic. The
renderer consumes any solver's ResolvedLayoutIR.
Demo
# Render a fixture to SVG (stub solver by default):
cargo run -p epiphany-render-svg --example render_fixture -- \
ten_measure_single_staff > out.svg
# Drive Agent I's engrave solver instead, to bisect renderer-vs-solver:
cargo run -p epiphany-render-svg --example render_fixture -- \
ten_measure_single_staff --solver=real > out.svg
# Use the embedded-font glyph mode (<text> + @font-face) instead of inline paths:
cargo run -p epiphany-render-svg --example render_fixture -- \
ten_measure_single_staff --glyph-mode=embedded > out.svg
Fixtures: ten_measure_single_staff, valid_score_rich, valid_score. Stats and
diagnostics go to stderr; the SVG goes to stdout.
Library
use epiphany_render_svg::{render, RenderOptions};
let out = render(&resolved_layout_ir, &RenderOptions::default());
assert!(out.is_well_formed());
println!("{}", out.svg);
render is pure and deterministic. RenderOptions controls SVG-encoding choices
only (display scale, margin, provenance attributes, and glyph_mode — inline
PathOutline vs EmbeddedFont) — nothing that changes engraving.
Bundled Bravura data
Two generated artifacts come from the official OFL Bravura.otf via
tools/extract_bravura_outlines.py — the font is not vendored, only the
generated Rust is committed:
src/outlines_generated.rs— the inline glyph outlines (geometry-only, so byte-stable across fontTools versions);src/font_subset_generated.rs— a base64 OTF subset (just the pipeline's glyphs) forGlyphMode::EmbeddedFont. As a Modified Version, its primary font name is renamed off the Reserved Font Name "Bravura" per the OFL; a content BLAKE3 + decoded length are committed alongside as an integrity lock.
Bravura is © Steinberg Media Technologies GmbH under the SIL Open Font License 1.1
(tools/OFL.txt); both artifacts are redistributed under the same license. To
regenerate both (the subset step also needs the blake3 package):
cd crates/epiphany-render-svg/tools
python3 -m venv .venv && . .venv/bin/activate && pip install fonttools blake3
python3 extract_bravura_outlines.py --font-out ../src/font_subset_generated.rs \
> ../src/outlines_generated.rs