Module imagery.compositing.source_over
Explicit alpha source-over compositing contract.
Functions
| Name | Description |
|---|---|
trySourceOver(source, destination, association, result)
|
Composite source over destination without implicit association changes.
|
tryValidityAwareSourceOver(source, sourceValid, destination, destinationValid, association, result, resultValid)
|
Composite with explicit validity flags. Validity is not alpha and is never inferred from the pixel values. An invalid source contributes nothing; when only one contributor is valid, that contributor is returned unchanged. |