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Sample Planar Multisample: Multisample image area is computed as perimeter or square · case 03

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

Member previewVariant 3 · 3 implementations · 6 checks per implementation

Case contract

A toy multisample target stores one full image per sample within each layer. Each sample image starts with a five-byte coverage header; layer footer length is seven bytes. Samples are never resolved or averaged. 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	`{"address": 38, "allocation_end": 288, "coverage_address": 33, "footer_address": 111, "image_pixels": 2, "layer_origin": 33, "layer_pitch": 85, "pixel_index": 0, "sample_origin": 38, "sample_pitch": 13}`	`{"address": 38, "allocation_end": 216, "coverage_address": 33, "footer_address": 87, "image_pixels": 1, "layer_origin": 33, "layer_pitch": 61, "pixel_index": 0, "sample_origin": 38, "sample_pitch": 9}`	Failed

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