Provides a glib.Bytes buffer containing the raw pixel data; the data
must not be modified. This function allows skipping the implicit
copy that must be made if Pixbuf.getPixels is called on a
read-only pixbuf.
A new reference to a read-only copy of
the pixel data. Note that for mutable pixbufs, this function will
incur a one-time copy of the pixel data for conversion into the
returned glib.Bytes
Provides a glib.Bytes buffer containing the raw pixel data; the data must not be modified. This function allows skipping the implicit copy that must be made if Pixbuf.getPixels is called on a read-only pixbuf.