FA-53235 / Raster memory layout / Member archive

Heterogeneous Channel Records: Pixel footer update targets next pixel or selected channel endpoint · case 05

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

Member previewVariant 5 · 3 implementations · 6 checks per implementation

Case contract

A toy pixel record stores channels with widths [1,2,1,4] bytes and a two-byte per-pixel footer. A view remaps logical channel indices through [2,0,3,1], and image rows have a three-byte guard. Return byte ranges without numeric interpretation. 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	`{"channel_end": 59, "channel_offsets": [0, 1, 3, 4], "channel_size": 1, "channel_start": 58, "footer_start": 65, "other_channel_ranges": [[55, 56], [56, 58], [59, 63]], "physical_channel": 2, "pixel_origin": 55, "pixel_pitch": 10, "row_pitch": 13}`	`{"channel_end": 59, "channel_offsets": [0, 1, 3, 4], "channel_size": 1, "channel_start": 58, "footer_start": 63, "other_channel_ranges": [[55, 56], [56, 58], [59, 63]], "physical_channel": 2, "pixel_origin": 55, "pixel_pitch": 10, "row_pitch": 13}`	Failed

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