FA-10564 / Raster compositing / Member archive
Destination out preserves uncovered · case 04
The erased coverage is retained instead of its complement.
Case contract
Destination is premultiplied RGBA. Destination-out retains each channel times one minus normalized source alpha.
Why this case matters
A deterministic software graphics stage with explicit channel and coordinate conventions; no hardware, device profile or API behavior is inferred.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| fixture 1 | [0.125, 0.0625, 0.0, 0.125] | [0.375, 0.1875, 0, 0.375] | Failed |
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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.
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