public delegate boolPixbufSaveFunc (string buf, ulong count)
Parameters
buf
Bytes to be written.
count
Number of bytes in buf.
Returns
true if successful, false if failed.
Remarks
It is called once for each block of bytes that is "written" by Pixbuf.SaveToCallback. If successful it should return true. If an error occurs it should set an error and return false, in which case Pixbuf.SaveToCallback will fail with the same error.