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Damage history clip: history window · case 03

Damage reconstruction includes one frame older than the backbuffer.

Member previewVariant 3 · 3 implementations · 11 checks per implementation

Case contract

Each frame begins with current damage and backbuffer age. Age zero requires full redraw; age k includes current damage and the last k-1 successfully presented frames. Failed presentation neither stores history nor clears accumulated damage. Bounds are applied before drawing; explicit full damage survives incremental additions.

Why this case matters

Raster clip state can leak coverage across draws even when every individual region is valid.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
explicit sequence 2	`[[0, 1, 2], [0, 1, 2]]`	`[[1, 2], [0, 1, 2]]`	Failed

MEMBER ARCHIVE

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

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