44 lines
1.9 KiB
Markdown
44 lines
1.9 KiB
Markdown
# M12-02A Status
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status: done
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task: inventory Blender preview dimensions, color semantics, and no-preview state
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updated: 2026-08-17 America/New_York
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enablingTask: true
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parityStateChange: false
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## Scope
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The machine inventory binds Blender 5.2 PreviewImage DNA, slot enum, BKE/RNA implementation,
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Blend reader, asset preview generator, render-size constants, current Web v1/v2 preview protocols,
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and two runtime fixtures. It records both ICON and PREVIEW slots, persisted dimensions/flags/pixel
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arrays, runtime-only state, and absent-pointer behavior.
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Preview pixels are packed 32-bit RGBA with four byte components and Blender's deferred load path
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premultiplies alpha. PreviewImage has no persisted or RNA color-space field, and float access only
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divides byte components by 255 without a color transform. The inventory therefore records color
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space as unknown instead of assuming sRGB.
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## Evidence
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- `npm --prefix web run test:asset-preview-inventory` launched locked Blender 5.2 twice and
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reported `slots=2 rna=9 absent=3 loaded=8x8 next=M12-02B`.
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- The checked-in asset fixture reopened with Object, Material, and World `preview == null`.
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- A real 8x8 PNG loaded through Blender's preview API produced an 8x8 PREVIEW slot, 32x32 ICON
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slot, 64/256 image packed/float counts, and 1024 icon packed pixels.
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- Typecheck, lint, status consistency, and `git diff --check` passed.
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## Artifact Hashes
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- inventory: `a4427426d94afdf1a2ccf5379d76d1797f8604a742a3f0d15bdca629272864bd`
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- checker: `c9cc83d21bac5f34c6d68cb1225dffcd92a5ec76c158ddce909b620cbbcb245c`
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- package command: `04f832a3c5773c8cc5294ecdcf175478eed9710496e48c63698d79043384e328`
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## Next Task
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`M12-02B`: define preview source/content SHA-256, MIME, dimensions, and generator identity.
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## Rollback
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Remove the M12-02A inventory, checker, package command, and this status entry. Restore M12-02A
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to pending and `nextTask` to M12-02A. No parity ledger rollback is required.
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