Inside Macintosh: Imaging with QuickDraw
This section describes the data structures and routines that your application can use to create and manage offscreen graphics worlds. "Data Structures" shows the Pascal data structures for the GWorldPtr and GWorldFlags data types. "Routines" describes routines for creating, altering, and disposing of offscreen graphics worlds; for saving and restoring offscreen graphics worlds; and for managing an offscreen graphics world's pixel map.