FA-52192 / Raster memory layout / Member archive

Independent Chroma Planes: Chroma width truncates odd luma edge or skips subsampling · case 02

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

Member previewVariant 2 · 3 implementations · 6 checks per implementation

Case contract

A 4:2:0 toy image has a byte luma plane plus independent U and V planes with distinct row guards. Chroma rounds odd dimensions up; plane headers are [1,2,3] bytes. Return physical sample locations for in-bounds luma coordinate. 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	`{"allocation_end": 102, "chroma_height": 3, "chroma_width": 3, "luma_address": 38, "u_address": 66, "u_origin": 60, "u_pitch": 6, "v_address": 88, "v_origin": 81, "v_pitch": 7}`	`{"allocation_end": 108, "chroma_height": 3, "chroma_width": 4, "luma_address": 38, "u_address": 67, "u_origin": 60, "u_pitch": 7, "v_address": 92, "v_origin": 84, "v_pitch": 8}`	Failed

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

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