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Bitplane Word Storage: Bitplane base uses row pitch or includes header as pixels · case 05

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

Member previewVariant 5 · 3 implementations · 6 checks per implementation

Case contract

A four-plane bitmap uses sixteen-bit words, most-significant-bit-first pixels, independent plane headers, and plane-major storage. Each row contains an extra sentinel word. Return word location and update mask without decoding colors. 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": 55, "bit_index": 15, "last_word_mask": 64512, "mask": 32768, "plane_bytes": 16, "plane_origin": 55, "row_bytes": 6, "row_words": 3, "word_column": 0, "words": 2}`	`{"address": 59, "bit_index": 15, "last_word_mask": 64512, "mask": 32768, "plane_bytes": 16, "plane_origin": 59, "row_bytes": 6, "row_words": 3, "word_column": 0, "words": 2}`	Failed

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