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Window regions

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Does anyone know of an easy way in Win32 to automatically generate a list of RECTs by specifying a window region and a list of RECTs that I DON'T want to draw to. The simplest example I can think of would be a) Window region is 640 by 480 b) Want to subtract region 10, 10, 20, 20 from this window region The resulting set would be 4 rects, one spanning the top of the window region, one left of the subtracted region, one right of the subtracted region, and one spanning the bottom of the window region.

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