websem: close SVG diffuse-lighting rows - #111
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Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. WalkthroughThe change adds ChangesDiffuse lighting support
Estimated code review effort: 4 (Complex) | ~60 minutes Merge Risk: 🔵 Low · up to The PR adds SVG diffuse-lighting support backed by extensive deterministic rendering and gate coverage. It is mergeable with explicit owner awareness that the associated decision record date is one day later than the review date and should be corrected or acknowledged. Sequence Diagram(s)sequenceDiagram
participant SVG
participant SVGCompiler
participant FilterProgram
participant N0
participant Skia
SVG->>SVGCompiler: parse feDiffuseLighting and direct light child
SVGCompiler->>FilterProgram: create FilterPrimitive::DiffuseLighting
FilterProgram->>N0: validate and resolve lighting primitive
N0->>Skia: build distant, point, or spot image filter
Skia-->>N0: return rendered diffuse-lighting filter
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 42.31% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 26 functions across 8 files. (1 skipped: 1 unsupported.)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In `@crates/websem/src/svg.rs`:
- Around line 4944-5145: Move the lighting product implementation out of
crates/websem/src/svg.rs:4944-5145, including lighting_number, lighting_color,
lighting_point, and diffuse_light_source; move the resolved lighting
representation from crates/n0/src/drawlist.rs:128-213, the lighting projection
from crates/n0/src/glyphless.rs:1057-1085, and the Skia lighting implementation
from crates/n0/src/paint.rs:2343-2992 into the repository-approved non-product
location, preserving their interfaces and behavior.
In `@docs/wg/consolidation/svg-engine-of-record.md`:
- Line 3662: Update the date in the “feDiffuseLighting and the light-source
family” addendum heading to the actual decision date, August 26, 2026, unless
the record is intentionally being published after August 27, 2026.
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crates/n0/src/drawlist.rscrates/n0/src/glyphless.rscrates/n0/src/paint.rscrates/n0_cli/README.mdcrates/rframe/src/filter.rscrates/rframe/src/lib.rscrates/rframe/tests/filter_contract.rscrates/websem/src/svg.rscrates/websem/tests/unsupported_corpus.rsdocs/wg/consolidation/svg-engine-of-record.mddocs/wg/consolidation/web-checklist.mdfixtures/web-first/README.mdfixtures/web-first/STATUS.mdfixtures/web-first/oracle-bake.jsonfixtures/web-first/primitives.jsonfixtures/web-first/unsupported/README.md
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CI follow-up d6e158b changes only the seam architecture timeout from 30 to 45 minutes. Evidence: attempt 1 reached the n0 architecture locks and was cancelled by the wall-clock cap; attempt 2 completed every legacy, extracted-Web, websem, rframe, and n0 architecture step successfully, then GitHub still marked the job cancelled at 30m03s while finalizing. No test command, assertion, cache key, or gate semantics changed. A fresh full run is required before merge. |
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Summary
feDiffuseLightingwith the shared resolvedfeDistantLight,fePointLight, andfeSpotLightseam acrosswebsem -> rframe -> n0.lighting-color,kernelUnitLength,specularExponent, andx/y/zrows open at their named splits.Measured verdict
Six twice-deterministic Chromium 149 matrices exercised 236 sources. Every candidate also rendered through the actual strict and best-effort
n0command path. After patrol, 217 candidates are pixel-exact and admission-identical; 19 reach a stable refusal; zero silent mismatches remain.Chromium ignores all 15 sampled diffuse
kernelUnitLengthspellings and all three sampled specular controls. Object-box z uses the normalized diagonal. General rotation, shear, and affine maps expose a native lighting precision boundary; diffuse output as the foreground offeComposite in/atopagainst a source-derived second input exposes a second narrow boundary. CSS lighting color, explicit inheritance,var(), and wider color syntax remain four named value/cascade refusals. The CSS property twin has no pinned Servo longhand, so this change adds no matcher around Stylo.Gate sensitivity was proved by temporarily halving the painter diffuse coefficient: 61 new cells failed, up to all 4,096 pixels and maximum channel delta 128. Restoring the coefficient returned the complete 812-cell gate to green.
Verification
cargo fmt --all -- --checkcargo test -p rframe -p n0 -p websem -p n0_clicargo clippy --no-depscargo clippy --no-deps --workspace --exclude grida-canvas-wasm -- -D warningsjust bake,just gate, andjust statusinfixtures/web-firstpnpm fmt:checkandpnpm exec oxlint --deny-warnings@grida/reftesttypecheck, build, and tests (51 passed, one skipped)No Workflow runner was exposed in this environment, so
.agents/workflows/verify-rung.jscould not be invoked through its required runner. I reproduced its independent TICK/LAW and REPRO roles by hand; both passed with no findings. No FLIP record, rule, baseline, or conformance score was touched.