FA-53112 / Raster memory layout / Member archive

Raster Dma Descriptor Chain: DMA destination chain inherits source stride or packed row length · case 02

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

Member previewVariant 2 · 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": 12, "descriptor_addresses": [902, 926], "descriptors": [[141, 533, 12, 926, false], [159, 551, 12, 0, true]], "destination_start": 533, "destinations": [533, 551], "head": 902, "next_pointers": [926, 0], "source_start": 141, "sources": [141, 159], "terminal_flags": [false, true]}`	`{"copy_bytes": 12, "descriptor_addresses": [902, 926], "descriptors": [[141, 533, 12, 926, false], [159, 558, 12, 0, true]], "destination_start": 533, "destinations": [533, 558], "head": 902, "next_pointers": [926, 0], "source_start": 141, "sources": [141, 159], "terminal_flags": [false, true]}`	Failed

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