A couple of years ago, I had to write a sort of a video hook driver. And there, I needed (among other things) to handle region operations, such as finding intersections, subtracting, joining regions, and etc. There s a support for such regions in Win32 API. Functions for manipulating regions are CreateRectRgn, CreateEllipticRgn, EqualRgn, GetRgnBox, OffsetRgn, CombineRgn, and etc. This API is pretty ugly and uncomfortable, in my opinion. Its implementation is concealed, and you have to mess with handles (HRGN) to work with it. When you need, for instance, to find an intersection of two regions, you have to create a new empty region handle, and then "fill" it with the intersection. That is:

GObjBase.h
GuardObjs.h
Main.cpp
Rgn.h
RgnTst.sln
RgnTst.vcproj
assert.h
ContainersInl.h

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