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Vance IngallsandClaude Opus 5
cb30157ebb
Widen the default-on drawElement clamp from darwin-only to darwin|win32 (still requiring a non-software-GPU browser). The darwin restriction was a validation envelope, not an architectural limit — the CanvasDrawElement Chrome flag ships on every platform, and every safety layer that made the macOS default-on release (v0.7.38) survivable is platform-neutral: compile-time gates, the SwiftShader init gate, per-render worker-encode self-verification with screenshot fallback, and the blank guard. Worst case on an unvalidated D3D11 backend is the same as on Metal: verify catches a bad frame and the render re-runs on the screenshot baseline. Why now: 30-day telemetry shows ~206k non-CI hardware-GPU Windows renders (~78% of the win32 fleet, 18k installs) held on the slow screenshot path by the clamp — the second-largest perf population after macOS, carrying ~1,550 capture-hours/month in the DE-eligible >=700-frame band alone at a measured ~2x speedup opportunity. Instrumentation for the new cohort: drawElement session init now records the raw WebGL UNMASKED_RENDERER_WEBGL string (detectSwiftShader generalized to detectGpuBackend — same single evaluate, the string was previously read and discarded) and threads it session -> CapturePerfSummary -> RenderPerfSummary -> render_complete as `gpu_renderer`. drawElement damage proved compositor-backend-specific throughout the macOS rollout, so D3D11-cohort failures must cluster by ANGLE backend + GPU vendor (NVIDIA/AMD/Intel), not just `os`. The two DE clamp branches are extracted into a pure, unit-tested `resolveDefaultDrawElement` (platform + GPU mode + worker-encode + explicit opt-in), which also drops resolveConfig's cyclomatic complexity. The win32 streaming-encode compound tests collapse onto one shared helper. Linux stays excluded: that fleet is headless/Docker SwiftShader, where DE has no speedup and known rendering defects. Kill switches unchanged: PRODUCER_EXPERIMENTAL_FAST_CAPTURE=false, --experimental-fast-capture=false. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>