FA-52207 / Raster memory layout / Member archive

Independent Chroma Planes: V plane incorrectly inherits U pitch or drops its guard · case 02

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

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 1	`{"allocation_end": 37, "chroma_height": 1, "chroma_width": 1, "luma_address": 23, "u_address": 26, "u_origin": 26, "u_pitch": 4, "v_address": 33, "v_origin": 33, "v_pitch": 4}`	`{"allocation_end": 38, "chroma_height": 1, "chroma_width": 1, "luma_address": 23, "u_address": 26, "u_origin": 26, "u_pitch": 4, "v_address": 33, "v_origin": 33, "v_pitch": 5}`	Failed

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

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