### Complex Region Management Functions

These functions are members of the GA_regionFuncs group. The functions provide support for allocating, freeing, copying and performing arithmetic on complex regions. Complex regions are used by graphical user interface environments to provide complex visible region clipping support.

ClearRegion | CopyIntoRegion
CopyRegion | DiffRegion
DiffRegionRect | FreeRegion
IsEmptyRegion | IsEqualRegion
NewRectRegion | NewRegion
OffsetRegion | OptimizeRegion
PtInRegion | SectRegion
SectRegionRect | TraverseRegion
UnionRegion | UnionRegionOfs
UnionRegionRect | GA_isSimpleRegion

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