FA-51239 / Raster clipping / Member archive

Overlap count clip regions: source original retention · case 04

Storing only initially visible source samples loses exterior coverage needed by later translations.

Member previewVariant 4 · 3 implementations · 12 checks per implementation

Case contract

Sources contribute unique sample sets to an overlap-count clip. Replacing a source first removes its old contribution. Removing an unknown source is inert. Coverage may select union, exactly-one, at-least-two or odd count. Moving a source translates its retained original sample set before clipping to the target, allowing previously exterior samples to enter. Draw emits selected finite samples.

Why this case matters

Raster clip state can leak coverage across draws even when every individual region is valid.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
explicit sequence 2	`[[]]`	`[[1]]`	Failed

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