FA-53078 / Raster memory layout / Member archive

Three Luma Ten Bit Words: Ten-bit update omits lane shift or clears word metadata bits · case 03

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

Member previewVariant 3 · 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 2	`{"bytes": [127, 1, 32, 193], "lane": 1, "mask": 1047552, "row_pitch": 14, "shift": 10, "updated": 3240100223, "valid_tail_lanes": 3, "word_address": 37, "word_column": 0, "words_per_row": 3}`	`{"bytes": [103, 121, 33, 193], "lane": 1, "mask": 1047552, "row_pitch": 14, "shift": 10, "updated": 3240196455, "valid_tail_lanes": 3, "word_address": 37, "word_column": 0, "words_per_row": 3}`	Failed

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