FA-10543 / Raster compositing / Member archive
Source over alpha union · case 03
Adding opacities treats overlap as disjoint coverage.
Case contract
Return source-over output alpha for two normalized opacities.
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 | 1.0 | 0.75 | Failed |
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