a #GOutputStream to save the pixbuf to
name of file format
name of options to set, %NULL-terminated
values for named options
optional #GCancellable object, %NULL to ignore
%TRUE if the pixbuf was saved successfully, %FALSE if an error was set.
GException on failure.
2.36
Saves @pixbuf to an output stream.
Supported file formats are currently "jpeg", "tiff", "png", "ico" or "bmp". See gdk_pixbuf_save_to_stream() for more details.