FA-52504 / Raster memory layout / Member archive

Pixel Interleaved Sample Banks: Pixel lane within paired bank uses bank coordinate or swaps pixels · case 04

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

Member previewVariant 4 · 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 2	`{"address": 492, "allocation_end": 1549, "bank_columns": 5, "bank_index": 10, "bank_pitch": 43, "bank_start": 474, "lane": 3, "pixel_lane": 0, "sample_slot": 3, "valid_lanes": 8}`	`{"address": 512, "allocation_end": 1549, "bank_columns": 5, "bank_index": 10, "bank_pitch": 43, "bank_start": 474, "lane": 3, "pixel_lane": 1, "sample_slot": 7, "valid_lanes": 8}`	Failed

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