FA-52198 / Raster memory layout / Member archive

Independent Chroma Planes: Chroma height truncates odd luma edge or skips subsampling · case 03

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

Member previewVariant 3 · 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 6	`{"allocation_end": 232, "chroma_height": 6, "chroma_width": 4, "luma_address": 121, "u_address": 176, "u_origin": 127, "u_pitch": 8, "v_address": 233, "v_origin": 178, "v_pitch": 9}`	`{"allocation_end": 249, "chroma_height": 7, "chroma_width": 4, "luma_address": 121, "u_address": 176, "u_origin": 127, "u_pitch": 8, "v_address": 241, "v_origin": 186, "v_pitch": 9}`	Failed

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

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