cPoints (LONG) - input

Number of (X, Y) pairs in paptlPoint.

This count must be set to 4.

The operation is determined by comparing the sizes of the two rectangles:

Target<Source

Compress the source rectangle into the target rectangle. The flOptions flags determine how eliminated rows and columns should be handled.
Target=Source
Copy between equal rectangles.
Target>Source
Stretch the source rectangle into the target rectangle. In this case, the call can be passed to the GreBitblt routine in the graphics engine.

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