GObject
    ╰── VipsObject
        ├── VipsOperation
        │   ╰── VipsForeign
        │       ├── VipsForeignLoad
        │       ╰── VipsForeignSave
        ├── VipsImage
        ├── VipsInterpolate
        ├── VipsRegion
        ╰── VipsThreadState
    GBoxed
    ├── VipsArea
    ├── VipsArrayDouble
    ├── VipsArrayInt
    ├── VipsArrayImage
    ├── VipsBlob
    ├── VipsRefString
    ╰── VipsThing