Inside Macintosh: QuickTime /

Chapter 4 - Movie Resource Formats / Overview of the Movie Resource Atom

Clipping Region Atoms

The clipping region atom specifies the clipping data. The layout of the clipping region atom is shown in Figure 4-13. You define a clipping region atom by specifying these elements:

• Size. A long integer that indicates the number of bytes in the clipping region data atom.
• Type. A long integer that indicates the type of the clipping region data (defined by the 'crgn' atom type).

The region size, region boundary box, and data fields constitute a QuickDraw region. See the chapter "QuickDraw" in Inside Macintosh: Imaging for details on QuickDraw regions.