FA-50948 / Raster clipping / Member archive

Winding event raster: nonzero positive · case 03

Nonzero filling drops clockwise contours with negative winding.

Member previewVariant 3 · 3 implementations · 12 checks per implementation

Case contract

Signed crossing events occur before their integer sample coordinate. For each finite target sample, sum all event deltas at or to its left, including events outside the left target edge. Fill rules are nonzero, odd, positive, negative, or magnitude-at-least-two. Inverse filling complements the result inside the target. Zero deltas are inert and coincident events add.

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 3	`[[]]`	`[[0, 1]]`	Failed

MEMBER ARCHIVE

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