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IntersectClipRect    Create New Clipping Region By Adding Rectangle

short IntersectClipRect(hDC, RcUlX, RcUlY, RcLrX, RcLrY);
HDC hDC;
short RcUlX; /* Rectangle upper left X coordinate */
short RcUlY; /* Rectangle upper left Y coordinate */
short RcLrX; /* Rectangle lower right X coordinate */
short RcLrY; /* Rectangle lower right Y coordinate */


Returns:
                return value
        |-------------------------------------|
        |COMPLEXREGION Overlapping borders    |
        |ERROR         Invalid DC             |
        |NULLREGION    Empty clipping area    |
        |SIMPLEREGION  No overlapping borders |
        +-------------------------------------+

Notes:      Rectangle length or height may not exceed 32,767.