type, which is currently "jpeg",
"png", "ico" or "bmp". This is a convenience function that uses
gdkPixbufSaveToCallback to do the real work. Note that the buffer
is not and may contain embedded nuls.
If error is set, FALSE will be returned and string will be set to
NULL. Possible errors include those in the GDK_PIXBUF_ERROR
domain.gdkPixbufSaveToBuffer(object, type, ..., .errwarn = TRUE)type...bufferbuffer.sizeerrorGError] return location for error, or NULLgdkPixbufSave for more details. Since 2.4