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Raster Dma Descriptor Chain: DMA record swaps read and write addresses or transmits row padding · case 03

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

Member previewVariant 3 · 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 2	`{"copy_bytes": 12, "descriptor_addresses": [903], "descriptors": [[538, 145, 12, 0, true]], "destination_start": 538, "destinations": [538], "head": 903, "next_pointers": [0], "source_start": 145, "sources": [145], "terminal_flags": [true]}`	`{"copy_bytes": 12, "descriptor_addresses": [903], "descriptors": [[145, 538, 12, 0, true]], "destination_start": 538, "destinations": [538], "head": 903, "next_pointers": [0], "source_start": 145, "sources": [145], "terminal_flags": [true]}`	Failed

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