FA-10658 / Raster clipping / Member archive
Viewport bottom origin flip · case 03
Origin conversion flips the top edge without accounting for rectangle height.
Case contract
Convert the top coordinate of an in-bounds top-left-origin rectangle to its bottom-left-origin viewport y using the full rectangle height.
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 | 8 | 5 | Failed |
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