The copy is done as follows, to support copy-on-write: * This function will cause an implicit copy of the pixbuf data if the * pixbuf was created from read-only data.
https://git.gnome.org/browse/gdk-pixbuf/tree/gdk-pixbuf/gdk-pixbuf.c#n674 I thought as long as the apparent functioning of the object is still the same to external users, then it is allowed to make internal changes even on a const instance? Using mutable members. If so, then maybe it would still be OK to wrap that as a const method.
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