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The following functions are used with regions.
| Function | Description |
|---|---|
| CombineRgn | Combines two regions and stores the result in a third region. |
| CreateEllipticRgn | Creates an elliptical region. |
| CreateEllipticRgnIndirect | Creates an elliptical region. |
| CreatePolygonRgn | Creates a polygonal region. |
| CreatePolyPolygonRgn | Creates a region consisting of a series of polygons. |
| CreateRectRgn | Creates a rectangular region. |
| CreateRectRgnIndirect | Creates a rectangular region. |
| CreateRoundRectRgn | Creates a rectangular region with rounded corners. |
| EqualRgn | Checks the two specified regions to determine whether they are identical. |
| ExtCreateRegion | Creates a region from the specified region and transformation data. |
| FillRgn | Fills a region by using the specified brush. |
| FrameRgn | Draws a border around the specified region by using the specified brush. |
| GetPolyFillMode | Retrieves the current polygon fill mode. |
| GetRegionData | Fills the specified buffer with data describing a region. |
| GetRgnBox | Retrieves the bounding rectangle of the specified region. |
| InvertRgn | Inverts the colors in the specified region. |
| OffsetRgn | Moves a region by the specified offsets. |
| PaintRgn | Paints the specified region by using the brush currently selected into the device context. |
| PtInRegion | Determines whether the specified point is inside the specified region. |
| RectInRegion | Determines whether any part of the specified rectangle is within the boundaries of a region. |
| SetPolyFillMode | Sets the polygon fill mode for functions that fill polygons. |
| SetRectRgn | Converts a region into a rectangular region with the specified coordinates. |