FA-52492 / Raster memory layout / Member archive

Pixel Interleaved Sample Banks: Sample-bank count drops odd pixel or creates one bank per pixel · case 02

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

Member previewVariant 2 · 3 implementations · 6 checks per implementation

Case contract

A toy 4-sample image stores samples in lane order [2,0,3,1]. Two adjacent pixels share a bank record with a three-byte bank tag; rows contain complete banks even for odd width. 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": 28, "allocation_end": 22, "bank_columns": 0, "bank_index": 0, "bank_pitch": 27, "bank_start": 22, "lane": 1, "pixel_lane": 0, "sample_slot": 1, "valid_lanes": 4}`	`{"address": 28, "allocation_end": 49, "bank_columns": 1, "bank_index": 0, "bank_pitch": 27, "bank_start": 22, "lane": 1, "pixel_lane": 0, "sample_slot": 1, "valid_lanes": 4}`	Failed

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