Gdi::CombineRgn_I

This method combines two regions and stores the result in a third region. The Gdi::CombineRgn_I method combines the two regions according to the specified mode.

static WINGDIAPI int WINAPI CombineRgn_I(
  HRGN hrgnDest, 
  HRGN hrgnSrc1, 
  HRGN hrgnSrc2, 
  int fnCombineMode
);

Parameters

• hrgnDest
  [in] Handle to a new region with dimensions defined by combining two other regions. This region must exist before you call Gdi::CombineRgn_I.
• hrgnSrc1
  [in] Handle to the first of two regions to be combined.
• hrgnSrc2
  [in] Handle to the second of two regions to be combined.
• fnCombineMode
  [in] Integer that specifies a mode that indicates how to combine the two regions. The following table shows the possible values.

  Value	Description
  RGN_AND	Creates the intersection of the two combined regions.
  RGN_COPY	Creates a copy of the region identified by hrgnSrc1.
  RGN_DIFF	Combines the parts of hrgnSrc1 that are not part of hrgnSrc2.
  RGN_OR	Creates the union of two combined regions.
  RGN_XOR	Creates the union of two combined regions except for any overlapping areas.

Return Values

The return value specifies the type of the resulting region. NULLREGION indicates that the region is empty. SIMPLEREGION indicates that the region is a single rectangle. COMPLEXREGION indicates that the region is more than a single rectangle. ERROR indicates that no region is created.

Remarks

This method is an internal version of the CombineRgn function.

The three regions do not need to be distinct. For example, the hrgnSrc1 parameter can equal the hrgnDest parameter.

Requirements

OS Versions: Windows CE .NET 4.0 and later.
Header: Gdi.hpp.

See Also

CombineRgn | Gdi::CreateRectRgnIndirect_I

Last updated on Wednesday, April 13, 2005

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