FA-10534 / Raster compositing / Member archive
Straight alpha source over channel · case 04
A straight source channel is treated as already premultiplied.
Case contract
Return a normalized straight source channel composited over an opaque destination channel. All three inputs lie in [0,1].
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 | 0.9 | 0.5 | Failed |
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