typedef struct {
WORD id; // if LPREGION 0x8000 else LPRECT
WORD cbSize; // sizeof(REGION)
LPRECT lprcClip; // NULL or region walking opt
DWORD dwUniq; // region uniqueness value
RECT rcBBox; // bounding box of region
DWORD cScans; // count of scans in region
LPSCAN lpScan; // ptr to first scan in region
} REGION;
Defines the attributes, bounding box, and scan lines of a region.