cmdMode (LONG) - input

Method of combination.

CRGN_OR

Union of hrgnSrc and prclRect.
CRGN_COPY
Uses prclRect only. The hrgnSrc parameter is ignored.
CRGN_XOR
Symmetric difference of hrgnSrc and prclRect.
CRGN_AND
Intersection of hrgnSrc and prclRect.
CRGN_DIFF
Uses hrgnSrc and not (prclRect).

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