FA-10550 / Raster compositing / Member archive
Premultiply all color channels · case 05
Straight RGB channels enter a pipeline that expects premultiplied channels.
Case contract
Convert normalized straight RGBA to premultiplied RGBA, leaving alpha itself unchanged.
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, 0.5, 0.25, 0.5] | [0.5, 0.25, 0.125, 0.5] | Failed |
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