FA-52323 / Raster memory layout / Member archive

Field Separated Scanlines: Field selection reverses parity or always addresses even storage · case 03

The returned physical layout descriptor disagrees with the declared buffer mapping at field_start.

Member previewVariant 3 · 3 implementations · 6 checks per implementation

Case contract

Even scanlines precede odd scanlines in two separately tagged fields. Each field starts with its own three-byte tag. Field rows use a two-byte guard and store x-fastest pixels. Return the named intermediate layout descriptor and final address fields; all quantities are integer byte offsets unless explicitly stated.

Why this case matters

Offline raster resource, upload, readback, and storage-layout regression model.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
layout fixture 1	`{"address": 45, "allocation_end": 45, "even_rows": 1, "field": 0, "field_row": 0, "field_start": 42, "odd_rows": 0, "odd_start": 42, "row_origin": 45, "row_pitch": 6}`	`{"address": 36, "allocation_end": 45, "even_rows": 1, "field": 0, "field_row": 0, "field_start": 33, "odd_rows": 0, "odd_start": 42, "row_origin": 36, "row_pitch": 6}`	Failed

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