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Three Luma Ten Bit Words: Packed sample lane uses nonexistent fourth lane or reverses order · case 02

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

Member previewVariant 2 · 3 implementations · 6 checks per implementation

Case contract

A stipulated luma row stores three ten-bit samples in each 32-bit little-endian word. The top two bits are preserved metadata. Each scanline starts with a two-byte exposure tag; final unused lanes are padding. 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 4	`{"bytes": [103, 69, 35, 65], "lane": 3, "mask": 1098437885952, "row_pitch": 18, "shift": 30, "updated": 69812307303, "valid_tail_lanes": 1, "word_address": 74, "word_column": 1, "words_per_row": 4}`	`{"bytes": [65, 68, 35, 193], "lane": 0, "mask": 1023, "row_pitch": 18, "shift": 0, "updated": 3240313921, "valid_tail_lanes": 1, "word_address": 74, "word_column": 1, "words_per_row": 4}`	Failed

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