forked from 1b-agent/opencadstudio-upstream
PanosandClaude Opus 5
391a74a615
Switching to a Layout re-tessellated the whole model — `memo_miss=186455`, 2034 ms — to arrive at geometry identical to what was already in the memo. The only thing that differed was colour. `local_wires_for` already knows this: it stores the raw colour and drops its background argument with `let _ = bg_color;`, noting that `Batches::finalize` applies `adapt_to_bg` last, "so the cache no longer has to rebuild on BACKGROUND / layout-switch". The tessellation memo's guard had not been told, and still mixed the background in, so every entry was discarded on a switch. `finalize` now records what its colour resolution consumed — the raw colour, the raw glyph colours, and the three flags it branches on — as `WireModel::bg_adapt`, and `resolve_colors_for_bg` replays it for another background. The guard drops the background, so a memo entry serves any layout. The resolution recomputes from the recorded raw colour rather than from the resolved one, which makes it idempotent and therefore safe over a set that mixes memo hits with freshly tessellated misses. Re-adapting the resolved colour would not be safe: `adapt_to_bg` snaps a near-white colour to pure black on a light background, and pure black comes back pure *white* on a dark one, losing the tint. A test pins that asymmetry so the raw colour is not optimised away later. The contract is tested against the real `finalize` rather than a copy of its logic: for every background pair, building under one and resolving for the other lands exactly where building under the other would have. `bg_adapt` is `None` for wires built anywhere else, and the resolution skips them, so nothing outside the block cache changes colour. It is also `None` when the resolution would be a no-op — a preserved colour with no canvas fill looks the same under every background — which keeps the common case at no cost. Ordering is unchanged: the pass runs inside the builder, before `append_scene_markers` and `apply_refedit_fade`, both of which have their own separate background dependency. `wires-build` gains `colors=` so the pass has a number of its own. Co-Authored-By: Claude Opus 5 <[email protected]>