Important: The information in this document is obsolete and should not be used for new development.
XorRgnTo calculate the difference between the union and the intersection of two regions, use the
PROCEDURE XorRgn (srcRgnA,srcRgnB,dstRgn: RgnHandle);
- A handle to the first of two regions to compare.
- A handle to the second of two regions to compare.
- A handle to the region to hold the result.
XorRgnprocedure calculates the difference between the union and the intersection of the regions whose handles you pass in the
srcRgnBparameters and places the result in the region whose handle you pass in the
This does not create the destination region; you must have already allocated memory for it by using the
If the regions are coincident,
XorRgnsets the destination region to the empty region defined by the rectangle (0,0,0,0).
XorRgnprocedure may temporarily use heap space that's twice the size of the two input regions.
XorRgnprocedure may move or purge memory blocks in the application heap. Your application should not call this procedure at interrupt time.