websem: close the SVG component-transfer rows - #106
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WalkthroughThe change adds static SVG ChangesComponent Transfer Filter
Estimated code review effort: 4 (Complex) | ~60 minutes Merge Risk: 🟡 Moderate · up to This PR adds the SVG component-transfer implementation in repository paths governed by a policy that disallows product code there. Merge requires relocating the implementation or explicitly revising that policy; the rendering changes otherwise have no supplied merge-blocking risk. Sequence Diagram(s)sequenceDiagram
participant SVGDocument
participant filter_resource
participant compile_graph
participant FilterProgram
participant n0Paint
participant Skia
SVGDocument->>filter_resource: provide feComponentTransfer
filter_resource->>compile_graph: resolve filter input and channel functions
compile_graph->>FilterProgram: emit ComponentTransfer with RGBA tables
FilterProgram->>n0Paint: provide validated filter graph
n0Paint->>Skia: create ARGB table color filter
Skia-->>n0Paint: render filtered content
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 68.89% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 45 functions across 9 files. (8 skipped: 8 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Inline comments:
In `@crates/rframe/src/filter.rs`:
- Around line 52-93: Remove or relocate the product/editor implementation from
crates/rframe/src/filter.rs lines 52-93, including FilterChannelTables; remove
the corresponding public API exposure in crates/rframe/src/lib.rs lines 28-29;
and remove or relocate the SVG component-transfer implementation in
crates/websem/src/svg.rs lines 4960-5106, keeping these Rust paths free of
product/editor code.
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📒 Files selected for processing (17)
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/filter_contract.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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Verdict
CLOSE/SPLIT. This closes the complete static
<feComponentTransfer>+ direct<feFuncR/G/B/A>family and the function-onlyamplitude,exponent,intercept,slope, andtableValuesattributes. Sharedtype,offset,graph, region, filter/CSS, resource, host, and animation rows remain open.
What changed
rframenow carries one source-neutral checked operation: four named exact256-byte channel tables and one input. No authored function vocabulary or
backend object crosses the contract.
websemresolves direct-child dispatch, last-channel-wins behavior, all fivefunction types, initial/invalid fallback, complete SVG number-list syntax,
Blink-ordered number normalization, per-function arithmetic, clamp, and byte
truncation.
n0realizes the four tables through the existing isolated filter graph andthe measured source/generated restore policy.
unsafe source-transform envelope. One generic patrol guards the independently
reproduced same-scope clip-plus-partial-opacity effect-stack boundary.
corpus. No existing oracle was overwritten.
Measured boundary
Chromium 149.0.7827.55 was captured twice through the shared hash-pinned module.
All 256 source bytes were swept for every function kind. Table, discrete, and
gamma use the measured double route; linear retains Blink's float products and
sum; all clamp and truncate. The
1.654435761slope alias selects the upperbinary32 control and differs from the raw lower neighbour by 2,304 pixels at
delta 1; a
.9table member exposes three lookup bytes.After source preflattening, paint-server inputs still differed by 210–848
pixels (up to delta 115). Fractional translation differed at 2 pixels / delta
7, and a 17-degree rotation at 58 / delta 12. A same-scope clip plus partial
opacity reproduced a 1,154-pixel / delta-2 restore split through six identity
or zero filters; splitting the effects across elements was exact. A separate
circle edge anomaly also reproduced with no filter and remains the deliberately
separate fill-only ellipse/box-world boundary in #88.
Every scratch and committed candidate rendered through both actual CLI
admissions. Fresh reproduction found zero Chromium pixel differences and zero
strict/best-effort differences across all 32 admitted cells.
Law and sensitivity
No Workflow runner is exposed in this environment. I therefore reproduced the
saved verifier's independent TICK/LAW and REPRO roles by hand. They found
exactly ten checkbox flips, complete committed evidence for those rows, no
second matcher, no unlabeled probe claim, additions-only sorted manifests,
unchanged capture hashes, and no score or FLIP change.
The gate is demonstrably sensitive: temporarily swapping the red and blue
painter tables made 28 of the 32 new cells fail, with up to all 4,096 pixels and
maximum channel delta 255. Restoring channel order returned all 534 cells to
green.
The corpus moves from 502 to 534 Chromium-baked cells plus 10 sampled frames;
the named refusal register moves from 131 to 134 rows.
Verification
cargo fmt --all -- --checkcargo test -p rframe -p n0 -p websem -p n0_clicargo clippy --no-deps --workspace --exclude grida-canvas-wasm -- -D warningsjust bake,just gate,just statusinfixtures/web-first/pnpm exec oxfmt --checkandpnpm exec oxlint --deny-warningsProgresses #43.