websem: admit guarded SVG group blending - #135
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Carry checked isolated normal, multiply and screen scopes through rframe and n0. Preserve opacity folding, initial SVG transparency and named source-profile boundaries. Add 94 exact Chromium cells and 43 refusals without ticking the incomplete CSS rows. Record source precision findings, mutation-sensitive gates and measured CPU costs.
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info⚙️ Run configurationConfiguration used: Organization UI Review profile: CHILL Plan: Team Run ID: ⛔ Files ignored due to path filters (32)
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Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. WalkthroughThis change adds isolated group blending for ChangesSVG group blending
Estimated code review effort: 5 (Critical) | ~120 minutes Merge Risk: ⚪ Minimal · up to This change adds guarded isolated SVG group blending with opacity support. No concrete merge-blocking risk remains in the supplied current-head evidence. Sequence Diagram(s)sequenceDiagram
participant SVGSource
participant SVGCompiler
participant Frame
participant Renderer
participant SkiaCanvas
SVGSource->>SVGCompiler: resolve blend and isolation
SVGCompiler->>Frame: emit blend scope
Frame->>Renderer: lower blend scope
Renderer->>SkiaCanvas: save and composite isolated layer
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 64.63% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 147 functions across 22 files. (7 skipped: 7 unsupported.)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
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Inline comments:
In `@crates/n0/src/paint.rs`:
- Around line 2715-2716: Validate the byte-255 near-unit opacity behavior in the
routing logic around ScopeBlendMode::Normal and ScopeBlendMode::Screen against
Chromium before changing it. If equality is required, special-case only Normal
opacities that quantize to 255 so they use the same path as unit opacity; keep
lower partial opacities on native SrcOver and assess Screen independently.
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Run ID: 6217cc5e-211b-4a0e-a993-974ae917adbb
⛔ Files ignored due to path filters (8)
fixtures/web-first/chromium/svg-group-blend-multiply-opacity-small-opaque.pngis excluded by!**/*.pngfixtures/web-first/chromium/svg-group-blend-multiply-opacity-small-partial.pngis excluded by!**/*.pngfixtures/web-first/chromium/svg-group-blend-screen-opacity-small-opaque.pngis excluded by!**/*.pngfixtures/web-first/chromium/svg-group-blend-screen-opacity-small-partial.pngis excluded by!**/*.pngfixtures/web-first/svg-group-blend-multiply-opacity-small-opaque.svgis excluded by!**/*.svgfixtures/web-first/svg-group-blend-multiply-opacity-small-partial.svgis excluded by!**/*.svgfixtures/web-first/svg-group-blend-screen-opacity-small-opaque.svgis excluded by!**/*.svgfixtures/web-first/svg-group-blend-screen-opacity-small-partial.svgis excluded by!**/*.svg
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crates/n0/src/glyphless.rscrates/n0/src/paint.rsfixtures/web-first/STATUS.mdfixtures/web-first/oracle-bake.jsonfixtures/web-first/primitives.json
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Why
Final verification complete: the near-unit review finding is measured and corrected.
The evidence-only hosted run establishes four 141-pixel / delta-1 failures;
the full fixed-head hosted x86 Rust suite now passes on
b2e6a4b1.Every final-head CI check and review has passed. Sixteen new boundary witnesses
cover both explicit isolation and ordinary group opacity. Local exact gates,
full default/trace suites, trace parity, lint, independent REPRO and
implementation reviews pass. The near-unit cost is explicitly disclosed below;
all fixed-head CI and review checks pass.
SVG group blending must composite completed children against the right
backdrop. Reusing leaf paint blending,
feBlend, or native backdrop-preservingopacity would give it the wrong meaning. This rung establishes that resolved
contract and a measured first Web profile without rebuilding the scene tree.
Measured verdict
ScopeEffect::Blend(ScopeBlend)for normal/multiply/screenplus optional group opacity. The independent contract producer and the n0
consumer have separate tests. n0 replays one empty-start layer and one
combined restore; native
BeginOpacityis unchanged.A late alpha patrol found redundant Normal isolation changed 1,600 pixels
by one value over a translucent backdrop. The compiler now preserves the
established opacity fold and removes unnecessary boundaries in one final
pass; it adds neither nested suffix moves nor a new subtree replay.
Authored clip-path and partial opacity isolate descendants; ordinary 2D
transforms and nested SVG overflow clips do not. Standalone initial
transparency is a producer fact, not a painter-wide assumption.
89 for multiply, 98 for screen). Same-element blend plus opacity versus an
outer opacity group differs by 2,048 pixels at delta 76.
at delta 19 under multiply and 100 at delta 28 under screen. Source-bound
controls remove the large gap but leave a separate isolated-normal rounding
difference. Root blend plus partial opacity also differs by up to two code
values. These are measured, not celled pixel verdicts; their sources are
named refusal witnesses, not tolerated positive cells.
named guards for wider geometry/paint/clip precision, filter/mask composition,
resource source programs, animation, fourteen other represented modes and
exterior HTML backdrops. Implicit-root isolation is guarded too. Both
admissions name departures; attributable failures roll back the whole group.
Evidence and verification
The 16 sampled frames, 16 dedicated text-pixel cells and 8 text-geometry
witnesses are unchanged. No checklist ticks. All three CSS blending rows
remain open; no attribute row is invented.
tests also execute onto colored caller canvases and prove removing the
transparent initial boundary changes the result.
survives independently of physical layers/fold eligibility; four new
unit/partial Normal-isolation filter/mask witnesses guard that conservative
boundary. Empty/pruned contributions remain inert.
just add;just bakeverifiedthe complete corpus against the same hash-pinned Chromium capture module.
No existing oracle, tolerance, score, or FLIP artifact changed.
just gatefail the whole-group witness at 2,048 pixels/delta 152. Restore the exact
painter bytes; the complete gate is green again.
fail at 1,600 or 1,024 pixels/delta 1. Restore the exact compiler bytes and
the complete gate returns green. The late alpha fix has its own tripwire.
explicit byte arithmetic for Multiply and partial-opacity Screen. Typed
constructor preflight performs no drawing; three per-thread effect slots
have at most 256 immutable bindings each, with Normal used only at byte-255
opacity, never cached pixels. Policy guards cover opacity/source-alpha
bytes, ordering and fresh-versus-reused bindings. A
group-only approximate-division mutation fails 28 cells; restoring exact
source bytes returns the complete 1,382/303 gate to green.
it reproduces the hosted 141-pixel/delta-1 failure and the same first pixel.
Accurate restoration returns the full gate to green; existing partial-Normal
opacity tests retain their previous exact expectations.
rotated Normal-isolated, plain and Screen groups. Hosted x86 fails only
the four near-unit Normal witnesses, each at 141 pixels/delta 1. The plain
unit/near pair differs by 143 pixels in Chromium, so the correction must
retain its source layer. Four bare-opacity controls match explicit isolation.
Both
ScopeEffect::OpacityandNormal(Some)now share n0's exact byte-255restoration and owner-bearing preflight, retaining the original resolved
opacity and topology. Lower-byte Normal, Screen routing and native
BeginOpacityare unchanged. The byte decision never enters websem/rframe.The AVX2-formula mutation fails eight cells and an independent partial-alpha
integer witness; exact-byte restoration returns all 1,398/303 gates green.
cargo fmt --all,cargo clippy --no-deps,pnpm fmt:check, fixture gates, generated status freshness andlinks/OSS audit all pass. The complete 1,382-cell Chromium gate also passes
with
n0/traceenabled. Corpus/status generation and freshness checking are runserially; an earlier concurrent run read the writer's empty truncation window.
.agents/workflows/verify-rung.jswas not run. Independent TICK/LAW andREPRO roles were reproduced manually. Both pass after every must-fix and
should-fix was resolved; the exact review evidence is recorded below.
Performance posture
The earlier native-only cost numbers do not describe the portable fix.
Final matched 100-Multiply-group paint p50 is about 131.46 ms on one M2
Ultra; 1,000 groups take 1,304.41 ms. A single group containing 100 source
pairs takes 2.53 ms, but that is a different semantic workload, not a legal
flattening rewrite. Unit-opacity Screen remains native; with the exact root
isolation restore, its 100-group workload takes about 5.21 ms.
The matched baseline/current protocol has one first-use sample,
five warmups, 20 source-compile, 80 frame-compile and 40 paint samples, with
three alternating repetitions. One old-opacity frame-compile median crosses
the 5% investigation threshold (25.46 → 26.79 µs). Five focused alternating
pairs give 25.21 → 25.83 µs with overlapping ranges; the alert does not repeat
above the threshold in that follow-up median. Both results and slower neutral
repetitions are retained in the record.
First Multiply frame compilation including effect construction is
671.96–1,021.50 µs; steady compilation is 27.21 µs. An unoptimized
shader took 137.50 ms; a tested transparent-source shortcut was slower and
was removed. No layer-area optimization is claimed. Public contract and
drawlist type sizes remain unchanged; neutral groups add no blend layer.
Untimed trace-only
observation reports 101 active-clip-sized layers for the 100-group case,
26,476,544 cumulative accessible bytes and 524,288 peak live blend bytes.
These are raster-span observations, not allocator/GPU-memory claims. There is
no new raster cache, allocation-bounds shortcut, or DirtyClass policy. The next
widening/optimization crux is source-extent and intermediate precision.
The separate matched near-unit follow-up is expensive: 100 ordinary
.999opacity groups at 256×256 go from 1.96 ms to 119.69 ms paint p50. Before/after
share one dependency lock and the same 5/20/80/40, three-alternating-pair
protocol. Frame compile goes from 25.29 to 26.25 µs.
.998,.5and neutralcontrol-stage medians do not regress beyond the 5% investigation threshold.
First near-unit compilation spans 654.58–2,151.42 µs; first paint spans
119.92–140.14 ms. The high first sample is retained. The source layers already
existed; their exact restores now enter trace counters (100 layers,
26,214,400 cumulative accessible bytes, 262,144 peak). This is a correctness
cost, not a claimed optimization; no wrong native fallback or unchecked
source bounds is introduced.
An additional 24-source ordinary-opacity patrol is unchanged from the
pre-rung binary. Curves/strokes/clips and the admitted alpha mask are exact;
existing radial/pattern/blur departures and older named guards are retained.
The silently admitted mismatches are filed separately in
gridaco/nothing#136, not
treated as exact, newly tolerated, or admitted as authored blending. Cause
and tick ownership remain unresolved; pre-existence does not exonerate the
closed opacity or radial-gradient rows.
External I/O, wider text, v1/editor/WASM, and the separately tracked damage,
gradient and legacy-import defects remain out of scope.
Final manual review ledger
The earlier reviews below remain part of the evidence history. The final
near-unit implementation review and independent consumer review both pass
with no must-fix or should-fix findings. Final REPRO recaptures sixteen cells
twice, verifies twenty Chromium pairs, runs thirty-two actual CLI admissions
and forty actual-output pairs, and passes the complete 1,398/303 gate,
read-only freshness and 20 default / 28 trace consumer tests. All 114 additions
retain their evidence and all 1,284 baseline source/oracle bytes remain
unchanged. Final cost and follow-up-disposition review also pass: the sole
should-fix was to preserve the unclassified source-precision findings with
their unresolved causes and tick ownership, now explicit in issue #136 and
the WG record. Full post-fix hosted x86 Rust tests, Clippy, builds and
all other CI/review checks pass on
b2e6a4b1; the review thread is resolved.ancestor guard-fact loss after Normal elision, and stale lowering prose.
Zero ticks, unchanged existing oracles, final byte arithmetic, the 141/135
etiology distinction and all refreshed performance claims audited.
opacity ordering, optimized exact arithmetic, partial-opacity Screen routing,
typed constructor-only preflight, bounded binding caches and the final
unit-Normal-only correction. The rejected
transparent shortcut is absent from the published code.
exact pixel pairs, then recaptured the four added opacity cells. Final
source reruns cover 46 actual CLI executions in both admissions: 32 opacity,
four rotate and ten Normal/opacity controls, all exact and without degradation.
All 98 new cells retain their evidence; all baseline 1,284 source/oracle
pairs remain unchanged. The complete 1,382-cell / 303-refusal gate and
read-only status freshness pass.
independently states the portable byte operations rather than treating a
known architecture-dependent native operation as an equivalent reference.