websem: correct linear blend source extents - #137
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WalkthroughThe renderer now derives device-space bounds for eligible linear-gradient blend sources. SVG validation rejects unproved source compositions and tracks omitted stroke extents. Tests, fixtures, corpus records, and documentation cover admitted and refused cases. ChangesLinear-gradient blend source extents
Estimated code review effort: 4 (Complex) | ~60 minutes Merge Risk: 🔵 Low · up to Some admitted strokes may use unnecessarily large blend layers. This is a bounded performance issue with a localized fix and does not affect output correctness. Sequence Diagram(s)sequenceDiagram
participant SVGCompiler
participant ProductExecute
participant BlendSourceExtents
participant Canvas
SVGCompiler->>ProductExecute: compile and execute validated blend content
ProductExecute->>BlendSourceExtents: compute source bounds from draw items and view
BlendSourceExtents->>Canvas: install device-space source clip
ProductExecute->>Canvas: create isolated blend layer
ProductExecute->>Canvas: restore source clip and complete blend
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 48.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 25 functions across 4 files. (9 skipped: 8 unsupported, 1 too large.)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Inline comments:
In `@crates/n0/src/paint.rs`:
- Line 4481: Update the stroke-box construction around the StrokeWidth::Uniform
match to use the normalized stroke width, ensuring equal-sided
StrokeWidth::Rectangular values are converted to a usable uniform width before
reaching RectStroke. Preserve the existing stroke bounds and clip_rect behavior
for all other stroke widths.
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📒 Files selected for processing (13)
crates/n0/src/paint.rscrates/n0/tests/group_blending.rscrates/n0_cli/README.mdcrates/websem/src/svg.rscrates/websem/tests/svg_blending.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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What this fixes
B2a found a silent wrong-pixel class in the admitted B1 rectangular-gradient blend profile. Both actual CLI admissions accepted a simple ramp at (8.3,12.7), but Multiply differed from pinned Chromium at 28 pixels and Screen at 56, maximum channel delta 1. Integer placement (8,12) also failed, at 50/84 pixels. B1's old (8,8) controls happened to hide the ordered-dither phase.
The cause is the source raster's origin, not the blend equation. A pinned-backend diagnostic changing only the inert clip's origin to (8,12) eliminated the Multiply difference; shrinking the far edge while keeping origin (0,0) did not. Chromium remains the external oracle.
Bounded correction
linear-gradient source-extent. Completed blend images are distinct from ramps painted directly into a parent. Attributable failures roll back the group; required root boundaries refuse in both admissions, including partial root opacity.Evidence
The reduced 58-source matrix, 72-source composition matrix, sixteen boundary controls and four root-opacity controls used the single unchanged hash-pinned Chromium capture module through the scratch probe harness. Each candidate also ran through
cargo run -p n0_cli --bin n0, strict and best-effort. The broad comparison restored the original B1 source byte-for-byte before its baseline rerender. These broad matrix facts are measured, not celled except for the committed witnesses.25 new exact Chromium cells bring the primitive corpus to 1,423; twenty-two new named refusals bring the register to 325. The sixteen sampled frames, sixteen text-pixel cells and eight text-geometry witnesses are unchanged. No existing oracle or tolerance changed, no checklist tick flips, no FLIP record or conformance score.
Independent TICK/LAW review found a missing selected stroke's extent despite a live fill. Follow-up probes confirmed transparent/zero-alpha/empty/unresolved strokes and context strokes resolving to no paint: 30/102 pixels differ for Multiply/Screen. A producer-private omitted-extent fact now survives paint dropping and context selection, separate from opacity-pass participation. No fake transparent paint or backend allocation hint crosses the frame. Exact none/zero-width/retained-clear-gradient/transparent-fill controls distinguish the admitted branches.
One final context best-effort render crossed the guard update and is excluded from pre-guard pixel evidence; its strict witness and both final guarded admissions were independently checked.
Disabling only the new source clip makes
just gatefail on twenty-three new cells, including the original 28/56 and integer 50/84 witnesses. Disabling the omitted-stroke guard separately makes the refusal gate fail and an actual best-effort context-fill render silently differ at 102 pixels/delta 1. Restoring the verified source hashes re-gates green. Consumer tests cover rounded allocation, balanced saves, changed views, mutable raw commands and fresh/retained identity; producer tests cover transactional and root refusals at stable paths.Verification
No Workflow runner is exposed in this environment, so
.agents/workflows/verify-rung.jscould not be invoked through a Workflow tool. Its independent TICK/LAW and REPRO roles were reproduced manually; both pass after all must_fix/should_fix findings were applied. TICK/LAW found the omitted-stroke gap described above; final source hashes were restored exactly after the sensitivity mutations.Local verification is green:
cg,csscascade,websem,rframe,n0-model,n0,animation-sampling,textlayoutandn0_clitests; final changed Web compiler/CLI suites rerun after the last guard change.cargo clippy --no-deps -- -D warnings,cargo fmt --all -- --check.just bake,just gate,just status; additions-only manifest/oracle audit, link checks and pre-PR OSS audit.The next design task is preserving source-coordinate-space extent facts before widening the profile. This does not fold in the ordinary-opacity findings in #136, generic coverage/damage work in #87/#88, or the other deliberately separate follow-ups. Position: #43.
Hosted review follow-up
The extent helper now uses the painter's existing stroke-width normalization, so equal-sided raw rectangular widths receive the same bounds as a uniform width. New consumer tests discriminate the original mismatch and verify rounded extents, nontrivial exact pixels and balanced saves for Multiply/Screen; unequal-sided and zero raw widths gain no extent. This representation-equivalence check adds no SVG grammar or Chromium cells.
Final commit
84501ee3passes all hosted build/test/lint and consolidation checks, and final local full n0 trace, trace pixels, gates/status, Clippy and formatting are green. CodeRabbit explicitly acknowledged the targeted fix and its coverage; a second full automated review was rate-limited. Both independent manual roles renewed their focused pass, and the sole review thread is resolved.