- vips — startup, shutdown, version
- VipsImage — the VIPS image class
- header — get, set and walk image headers
- generate — calculate pixels and pixel buffers
- VipsOperation — the VIPS operation base object class
- error — error messages and error handling
- memory — memory utilities
- VipsRegion — small, rectangular parts of images
- type — basic types
- rect — the VIPS rectangle class
- VipsObject — the VIPS base object class
- VipsThreadState — pools of worker threads
- buf — a string you can append to
- basic — a few typedefs used everywhere