websem: admit bounded SVG pattern paint servers - #112
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WalkthroughThis change adds bounded same-document SVG ChangesSVG repeating pattern paint
Estimated code review effort: 5 (Critical) | ~120 minutes Merge Risk: 🟡 Moderate · up to The PR expands SVG pattern rendering, but percentage-based transforms can still produce incorrect pixels and deeply nested patterns may do excessive recursion before being rejected. Merge should wait for these bounded correctness and runtime risks to be fixed or explicitly accepted. Sequence Diagram(s)sequenceDiagram
participant SVG as SVG compiler
participant PaintServers as Paint server resolver
participant PatternCompiler
participant RFrame as PatternPaint
participant N0 as n0 compiler
participant Skia as Skia executor
SVG->>PaintServers: classify url(`#pattern`)
PaintServers-->>PatternCompiler: resolve local pattern template
PatternCompiler->>RFrame: build checked tile program
RFrame-->>N0: provide pattern paint
N0->>Skia: emit PatternFill or PatternStroke
Skia->>Skia: preflight and replay repeating shader
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 56.36% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 110 functions across 17 files. (10 skipped: 10 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Inline comments:
In `@crates/websem/src/svg.rs`:
- Around line 2734-2738: Add a pattern-compilation depth pre-check before the
nested pattern compile_source call, using the same boundary and error behavior
as the existing mask path and rframe::MAX_PATTERN_DEPTH. Keep the
active_patterns NodeId cycle check, and ensure distinct nested patterns are
rejected before compile_source starts recursion.
- Around line 2976-2990: Update the computed_transform_to_affine call in the
pattern transform handling to pass None instead of the tile dimensions, ensuring
percentage patternTransform values produce TransformRefusal::Percentage.
Preserve the existing refusal-to-error mapping and other transform behavior.
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📒 Files selected for processing (27)
crates/csscascade/src/dom.rscrates/csscascade/tests/svg_presentation_hints.rscrates/n0/src/drawlist.rscrates/n0/src/frame.rscrates/n0/src/glyphless.rscrates/n0/src/paint.rscrates/n0/tests/drawlist.rscrates/n0/tests/patterns.rscrates/n0_cli/README.mdcrates/rframe/README.mdcrates/rframe/src/frame.rscrates/rframe/src/lib.rscrates/rframe/tests/pattern_contract.rscrates/websem/src/svg.rscrates/websem/src/svg_paint_server.rscrates/websem/tests/context_paint_contract.rscrates/websem/tests/mask_contract.rscrates/websem/tests/pattern_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/html-inline-svg-pattern.htmlfixtures/web-first/oracle-bake.jsonfixtures/web-first/primitives.jsonfixtures/web-first/unsupported/README.md
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Summary
<pattern>paint-server profile acrosswebsem -> rframe -> n0. The producer resolves one checked, source-neutral vector tile program; the renderer replays it through one repeating picture shader.patternUnitsandpatternContentUnitsrows. Keep<pattern>andpatternTransformopen at named source-composition, precision, context-selection, and external-resource splits.Measured verdict
Chromium 149 probes covered both unit systems and defaults, per-client object boxes, number/percentage/px tile lengths, invalid and empty fallback, local
href/xlink:hrefinheritance and cycles,viewBoxplus all admitted aspect-ratio mappings, fill and stroke clients, nested patterns, masks,<use>, target effects, and the checked transform envelope. Every committed candidate also rendered through the actual strict and best-effortn0command path.The probe pass found three silent wrong-pixel classes in the former route. CSS comments around a valid tile length made both admissions choose fallback while Chromium painted the pattern, changing all 2,304 target pixels at maximum delta 202. Huge positive, adjacent, negative, and finite-beyond-binary32
xsources changed 1,152, 1,152, 768, and 2,112 pixels respectively, all at maximum delta 205. PR review then found that Chromium resolves inline CSStransform:translate(50%, 0px)on a 14-unit pattern against the 64-unit viewport, exact to32px; the former tile-width basis selected7pxand changed 1,008 pixels at maximum delta 205. All three classes now refuse by stable name before a frame escapes. The invalid percentage spelling in thepatternTransformpresentation attribute itself drops to identity and remains separate.Review also found that the eight-program contract bound was checked only after recursively compiling every distinct nested source. The producer now rejects a ninth pattern before measuring or entering its source walk; cycle detection remains a separate active-id patrol.
General affine and fractional tile mappings, curved and isolated source composition, context-selected patterns, pattern-source filters, external templates, deferred length families, and unresolved normalization provenance remain guarded splits. Chromium honors the measured context-selected pattern and safe source blur, so those are deliberately deferred rather than silently narrowed. The midpoint-adjacent normalization probes did not demonstrate a second alias at the fixture size; the conservative provenance patrol remains, and no mismatch is claimed.
Gate sensitivity was proved by temporarily changing horizontal tile repetition from repeat to clamp: 43 pattern cells failed, up to 1,824 pixels and maximum channel delta 255. Restoration returned the complete 874-cell gate to green. A nearest-filter perturbation moved no admitted cell and was rejected as a sensitivity proof.
Verification
cargo fmt --all -- --checkcargo clippy --no-deps --workspace --exclude grida-canvas-wasm -- -D warningscargo test --workspace --exclude grida-canvas-wasmcargo test -p csscascade -p rframe -p websem -p n0 -p n0_clijust 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 the independent TICK/LAW and REPRO roles by hand. That review found the CSS-comment and used-range silent mismatches, restored the context-selection and source-filter boundaries, corrected a stale mask assertion and stale prose, and moved the rare pattern payload behind immutable indirection to avoid inflating ordinary frame items. PR review additionally found the CSS-percentage reference-box error and late nested-depth check described above. All findings were applied. No FLIP record, rule, baseline, or conformance score was touched.