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