FA-53135 / Raster memory layout / Member archive

Raster Dma Descriptor Chain: Zero-row DMA starts an uninitialized descriptor or every chain is suppressed · case 05

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

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 1	`{"copy_bytes": 12, "descriptor_addresses": [], "descriptors": [], "destination_start": 548, "destinations": [], "head": 905, "next_pointers": [], "source_start": 153, "sources": [], "terminal_flags": []}`	`{"copy_bytes": 12, "descriptor_addresses": [], "descriptors": [], "destination_start": 548, "destinations": [], "head": 0, "next_pointers": [], "source_start": 153, "sources": [], "terminal_flags": []}`	Failed

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

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