GObject
    ├── VipsObject
    │   ├── VipsConnection
    │   │   ├── VipsSource
    │   │   │   ╰── VipsSourceCustom
    │   │   ╰── VipsTarget
    │   │       ╰── VipsTargetCustom
    │   ├── VipsOperation
    │   │   ╰── VipsForeign
    │   │       ├── VipsForeignLoad
    │   │       ╰── VipsForeignSave
    │   ├── VipsImage
    │   ├── VipsInterpolate
    │   ├── VipsRegion
    │   ├── VipsSbuf
    │   ╰── VipsThreadState
    ╰── GInputStream
        ╰── VipsGInputStream
    GBoxed
    ├── VipsArea
    ├── VipsArrayDouble
    ├── VipsArrayInt
    ├── VipsArrayImage
    ├── VipsBlob
    ├── VipsRefString
    ╰── VipsThing