FA-52339 / Raster memory layout / Member archive

Field Separated Scanlines: Odd field extent omits its tag or uses even field row count · case 04

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

Member previewVariant 4 · 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": 47, "allocation_end": 54, "even_rows": 1, "field": 0, "field_row": 0, "field_start": 44, "odd_rows": 0, "odd_start": 54, "row_origin": 47, "row_pitch": 7}`	`{"address": 47, "allocation_end": 57, "even_rows": 1, "field": 0, "field_row": 0, "field_start": 44, "odd_rows": 0, "odd_start": 54, "row_origin": 47, "row_pitch": 7}`	Failed

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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

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