MagickGetSizeOffset, MagickSetSizeOffset

[RetroJ]

Hello,

I noticed that MagickGetSizeOffset returns just one out-value (offset), but MagickSetSizeOffset sets three values (columns, rows, offset). What is an offset, and what is the reason that these methods are not a mirrored pair like most of the other Get/Set methods? (I am working on some bindings, and need to decide how to bind these..)