cmdMode (LONG) - input

Method of combination.

CRGN_OR

Union of hrgnSrc1 and hrgnSrc2.
CRGN_COPY
Uses hrgnSrc1 only. hrgnSrc2 is ignored.
CRGN_XOR
Symmetric difference of hrgnSrc1 and hrgnSrc2.
CRGN_AND
Intersection of hrgnSrc1 and hrgnSrc2.
CRGN_DIFF
Uses hrgnSrc1 and not (hrgnSrc2).

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