FA-53120 / Raster memory layout / Member archive

Raster Dma Descriptor Chain: DMA descriptor stride uses payload length or loses descriptor relocation · case 05

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

Member previewVariant 5 · 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 4	`{"copy_bytes": 30, "descriptor_addresses": [905, 935, 965], "descriptors": [[189, 566, 30, 929, false], [228, 615, 30, 953, false], [267, 664, 30, 0, true]], "destination_start": 566, "destinations": [566, 615, 664], "head": 905, "next_pointers": [929, 953, 0], "source_start": 189, "sources": [189, 228, 267], "terminal_flags": [false, false, true]}`	`{"copy_bytes": 30, "descriptor_addresses": [905, 929, 953], "descriptors": [[189, 566, 30, 929, false], [228, 615, 30, 953, false], [267, 664, 30, 0, true]], "destination_start": 566, "destinations": [566, 615, 664], "head": 905, "next_pointers": [929, 953, 0], "source_start": 189, "sources": [189, 228, 267], "terminal_flags": [false, 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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