/**
* Subtract this layer area from an underlying dirty regions. The method is designed to reduce
* dirty regions of a layres below the opaque visible layer.
*
* @param le layer list element
*/
private void cleanLowerDirtyRegions(CLayerElement le) {
if (CGraphicsQ.DEBUG) {
System.err.println("Clean dirty regions under opaque layer: " + le.getLayer());
}
CLayer l = le.getLayer();
for (CLayerElement le2 = le.getLower(); le2 != null; le2 = le2.getLower()) {
CLayer l2 = le2.getLayer();
if (l2.isDirty()) {
l2.subDirtyRegion(
l.bounds[X] - l2.bounds[X], l.bounds[Y] - l2.bounds[Y], l.bounds[W], l.bounds[H]);
}
}
}
