This structure describes the data returned by the GetRegionData function.
Specifies the size, in bytes, of the header.
Specifies the type of region. This value must be RDH_RECTANGLES.
Specifies the number of rectangles that make up the region.
Specifies the size of the buffer required to receive the RECT structure that specifies the coordinates of the rectangles that make up the region.
If the size is not known, this member can be zero.
Specifies a bounding rectangle for the region.