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AndRegionRegion -- Perform 2d AND operation of one region
with second region, leaving result in second region.
status = AndRegionRegion(region1,region2)
d0 a0 a1
BOOL AndregionRegion(struct Region *, struct Region * );
Remove any portion of region2 that is not in region1.
region1 - pointer to Region structure
region2 - pointer to Region structure to use and for result
status - return TRUE if successful operation
return FALSE if ran out of memory
OrRegionRegion(), AndRectRegion(), <graphics/regions.h>
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