Files
lightcraft/crates/pipeline
wstockandClaude Fable 5.1 5e9a1b6ec7 Visualize: the all-masks overlay shows the union of the masks, not the last one
`Overlay::AllMasks` painted each mask's plane in turn, and every mask view
rewrites the whole image from its alpha (White on Black writes `255·a`,
Image on Black multiplies by `a`…), so each plane wiped the ones before it
and only the last visible mask showed. The planes are now merged (per-pixel
max) and painted once; the GPU path goes through the same `apply`.

The test added with #919 could not pass: besides the above, its hidden-mask
check expected the plain pixel under White on Black, where everything
outside the masks is black by definition (as the single-mask test asserts).

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NH3itd85jPuM6wNjgcGfEH
2026-10-13 07:26:18 +00:00
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