FA-53109 / Raster memory layout / Member archive

Raster Dma Descriptor Chain: DMA source chain drops source row padding or repeats first row · case 04

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

Member previewVariant 4 · 3 implementations · 6 checks per implementation

Case contract

Each raster row copies a valid contiguous byte region from pitched source to pitched destination. Hardware descriptors hold absolute source, destination, length, next-pointer, and terminal flag; descriptors are 24 bytes and begin at a separate base. 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 3	`{"copy_bytes": 20, "descriptor_addresses": [904, 928], "descriptors": [[165, 551, 20, 928, false], [185, 588, 20, 0, true]], "destination_start": 551, "destinations": [551, 588], "head": 904, "next_pointers": [928, 0], "source_start": 165, "sources": [165, 185], "terminal_flags": [false, true]}`	`{"copy_bytes": 20, "descriptor_addresses": [904, 928], "descriptors": [[165, 551, 20, 928, false], [193, 588, 20, 0, true]], "destination_start": 551, "destinations": [551, 588], "head": 904, "next_pointers": [928, 0], "source_start": 165, "sources": [165, 193], "terminal_flags": [false, true]}`	Failed

MEMBER ARCHIVE

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

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