FA-51225 / Raster clipping / Member archive

Dashed stroke clip phase: segment local index · case 05

All samples in a draw share the first sample dash decision.

Member previewVariant 5 · 3 implementations · 10 checks per implementation

Case contract

A logical stroke has positive integer dash lengths; an odd-length dash array is duplicated to preserve on/off parity over cycles. Each draw advances path phase through all samples, including clipped samples. Move begins a new subpath at the configured offset. Changing offset affects the next move, while changing pattern resets phase immediately. Empty pattern means solid. Draw reports visible on-sample positions within that segment.

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 0	`[[0, 1, 2, 3, 4, 5]]`	`[[0, 2, 4]]`	Failed

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