feat(engine): scene-level post-processing effects#62
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grain, vignette, pixelate and progressive_blur as pure-Rust RGBA buffer post-processing (deterministic, zero Skia): splitmix64-seeded grain (per-frame animated option), smoothstep vignette, partial-edge block pixelate, variable-radius separable box blur. Applied in declaration order at the single convergence point render_frame_task_scaled (covers encode, studio and stills); slide transitions apply the incoming scene's effects to avoid a pop at the blend boundary; world frames excluded (no single source scene, documented). HTML dialect: <scene effects='[...]'> JSON-in-attribute with dedicated transpile error.
LeadcodeDev
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Follow-up to #62: derivable Default, div_ceil, redundant casts.
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Closes #51 — the last wave-2 workstream.
Goal: grain, vignette, pixelate, progressive blur at scene level — frame-wide effects the per-element FilterFn machinery can't express.
animatedre-seeds per frame), smoothstep vignette, block-average pixelate with partial edges, separable box blur with per-row variable radius (cost documented: ~O(w·h·max_radius), rows abovestartare pure copies)render_frame_task_scaled— the single point where encode, studio and stills converge; slide transitions get the incoming scene's effects (no pop at the blend→normal boundary); world frames excluded and documented (no single source scene)Scene.effects: [PostEffect]additive; unknown effect types rejected at load; HTML dialect<scene effects='[...]'>with a dedicated transpile errorTests: 25 new — 15 unit (identity/determinism/alpha preservation/ordering proof), 5 pipeline (rendered corners darker, serde round-trips), 5 HTML. 329 total, all green.
Verify:
cargo test --workspace→ 329 passed ✓ ·cargo fmt --check✓ · clippy 0 warnings ✓