FA-53218 / Raster memory layout / Member archive
Heterogeneous Channel Records: Channel byte origin uses logical lane or channel number as byte offset · case 03
The returned physical layout descriptor disagrees with the declared buffer mapping at channel_start.
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 fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| layout fixture 1 | {"channel_end": 34, "channel_offsets": [0, 1, 3, 4], "channel_size": 1, "channel_start": 33, "footer_start": 41, "other_channel_ranges": [[33, 34], [34, 36], [37, 41]], "physical_channel": 2, "pixel_origin": 33, "pixel_pitch": 10, "row_pitch": 13} | {"channel_end": 37, "channel_offsets": [0, 1, 3, 4], "channel_size": 1, "channel_start": 36, "footer_start": 41, "other_channel_ranges": [[33, 34], [34, 36], [37, 41]], "physical_channel": 2, "pixel_origin": 33, "pixel_pitch": 10, "row_pitch": 13} | Failed |
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