Copy in the entire region access area from a source region access.

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object.CopyInEntireArea SourceRegionAccess

The CopyInEntireArea Method syntax has these parts:

This routine encapsulates the common task of copying the entire bounds of one region access to another. Here, this region access is the destination, while the argument is the source. If a RegionMask property is set, the copy is masked.

You should use this method rather than Src.GetArea followed by a Dst.PutArea, because this method does the copy in strips, so that the full image does not have to be in memory all at once. This is critical to avoid thrashing for images that are larger than about one half the size of installed physical memory.