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ExtCreateRegion function

Applies to: desktop apps only

The ExtCreateRegion function creates a region from the specified region and transformation data.

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HRGN ExtCreateRegion(
  __in  const XFORM *lpXform,
  __in  DWORD nCount,
  __in  const RGNDATA *lpRgnData
);

lpXform [in]: A pointer to an XFORM structure that defines the transformation to be performed on the region. If this pointer is NULL, the identity transformation is used.
nCount [in]: The number of bytes pointed to by lpRgnData.
lpRgnData [in]: A pointer to a RGNDATA structure that contains the region data in logical units.

If the function succeeds, the return value is the value of the region.

If the function fails, the return value is NULL.

Region coordinates are represented as 27-bit signed integers.

An application can retrieve data for a region by calling the GetRegionData function.