flOptions (ULONG) - input
These
flags determine the type of region to be returned in hrgn:
COPYCRGN_ALLINTERSECT
The function must return
the intersection of all clipping. This value describes the DC region and
is expressed in screen coordinates.
COPYCRGN_VISRGN
The function must return a
copy of the visible region only. This value is returned in screen coordinates.
COPYCRGN_CLIPRGN
The function must return
a copy of the clip region only. The clip region is expressed in device coordinates.
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