## Presentation Device Driver Reference for OS/2

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### GreCombineRectRegion - Parameters

hdc (HDC) - input Device context handle.

hrgnDst (HRGN) - input Destination region handle.

prclRect (PRECTL) - input Pointer to rectangle.

hrgnSrc (HRGN) - input Region handle.

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).

pInstance (PVOID) - input Pointer to instance data.

lFunction (ULONG) - input High-order WORD=flags; low-order WORD= NGreCombineRectRegion.

rc (LONG) - returns This function returns an integer (lComplexity) indicating the complexity of the new region:

RGN_ERROR Error
RGN_NULL Null region
RGN_RECT Rectangular region
RGN_COMPLEX Complex region (more than one rectangle)

Possible Errors Detected: When an error is detected, the handling routine must call WinSetErrorInfo to post the condition. Error codes for conditions that the handling routine is expected to check include:
PMERR_HRGN_BUSY
PMERR_INSUFFICIENT_MEMORY
PMERR_INV_COORDINATE
PMERR_INV_HRGN
PMERR_INV_RECT
PMERR_INV_REGION_MIX_MODE
PMERR_REGION_IS_CLIP_REGION

Refer to the "Error Explanations" section in the Presentation Manager Programming Reference for further explanation.